Дисертації з теми "Color transfers"
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1
Forcales, Fernández Manuel. "Two-color spectroscopy of energy transfers in Si:Er." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2004. http://dare.uva.nl/document/77576.
2
Carrillo, Hernan. "Colorisation d'images avec réseaux de neurones guidés par l'intéraction humaine." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0016.
Анотація:
La colorisation est le processus qui consiste à ajouter des couleurs aux images en niveaux de gris. C’est une tâche importante dans la communauté de l’édition d’images et de l’animation. Bien que des méthodes de colorisation automatique existent, elles produisent souvent des résultats insatisfaisants en raison de défauts tels que le débordement de couleur, l’incohérence, des couleurs non naturelles et la nature non trivial du problème. Par conséquent, une intervention manuelle est souvent nécessaire pour obtenir le résultat souhaité. En conséquence, il y a un intérêt croissant à automatiser le processus de colorisation tout en permettant aux artistes d’ajouter leur propre style et vision. Dans cette thèse, nous étudions divers formats d’interaction en guidant les couleurs sur des zones spécifiques d’une image, ou en les transférant à partir d’une image ou d’un objet de référence. Nous introduisons deux méthodes de colorisation semi-automatiques. Tout d’abord, nous décrivons une architecture d’apprentissage profond pour la colorisation d’images qui prend en compte les images de référence de l’utilisateur. Notre deuxième méthode utilise un modèle de diffusion pour coloriser des dessins en utilisant des indications de couleur fournies par l’utilisateur. Cette thèse commence par l’état de l’art des méthodes de colorisation d’images, des espaces de couleur, des métriques d’évaluation et des fonctions de perte. Bien que les méthodes de colorisation récentes basées sur des techniques d’apprentissage profond obtiennent les meilleurs résultats, ces méthodes sont basées sur des architectures complexes et un grand nombre de fonctions de perte, ce qui rend difficile leur compréhension. Pour cela, nous utilisons une architecture simple afin d’analyser l’impact de différents espaces de couleur et fonctions de perte. Ensuite, nous proposons une nouvelle couche d’attention appelée super-attention qui utilise des superpixels. Elle permet d’établir des correspondances entre les caractéristiques hautes résolutions de paires d’images cible et référence. Cette proposition permet d’atténuer le problème de la complexité quadratique des couches d’attention. De plus, elle aide à surmonter les défauts de débordement de couleur dans la tâche de colorisation. Nous étudions son utilisation pour le transfert de couleur, et pour la colorisation basée sur des exemples. Nous proposons également une extension de ce modèle afin de guider spécifiquement la colorisation sur des objets segmentés. Enfin, nous proposons un modèle de diffusion probabiliste basé sur des conditionnements implicites et explicites, pour apprendre à coloriser des dessins au trait. Notre approche permet d’ajouter des interactions utilisateur à travers des indices de couleur explicites tout en s’appuyant sur l’entraînement du modèle de diffusion principal. Nous utilisons un encodeur spécifique qui apprend à extraire des informations sur les indices de couleur fournis par l’utilisateur. Ce modèle permet d’obtenir des images colorisées diverses et de haute qualitéColorization is the process of adding colors to grayscale images. It is an important task in the image-editing and animation community. Although automatic colorization methods exist, they often produce unsatisfying results due to artifacts such as color bleeding, inconsistency, unnatural colors, and the ill-posed nature of the problem. Manual intervention is often necessary to achieve the desired outcome. Consequently, there is a growing interest in automating the colorization process while allowing artists to transfer their own style and vision to the process. In this thesis, we investigate various interaction formats by guiding colors of specific areas of an image or transferring them from a reference image or object. As part of this research, we introduce two semi-automatic colorization frameworks. First, we describe a deep learning architecture for exemplar-based image colorization that takes into account user’s reference images. Our second framework uses a diffusion model to colorize line art using user-provided color scribbles. This thesis first delves into a comprehensive overview of state-of-the-art image colorization methods, color spaces, evaluation metrics, and losses. While recent colorization methods based on deep-learning techniques are achieving the best results on this task, these methods are based on complex architectures and a high number of joint losses, which makes the reasoning behind each of these methods difficult. Here, we leverage a simple architecture in order to analyze the impact of different color spaces and several losses. Then, we propose a novel attention layer based on superpixel features to establish robust correspondences between high-resolution deep features from target and reference image pairs, called super-attention. This proposal deals with the quadratic complexity problem of the non-local calculation in the attention layer. Additionally, it helps to overcome color bleeding artifacts. We study its use in color transfer and exemplar-based colorization. We finally extend this model to specifically guide the colorization on segmented objects. Finally, we propose a diffusion probabilistic model based on implicit and explicit conditioning mechanism, to learn colorizing line art. Our approach enables the incorporation of user guidance through explicit color hints while leveraging on the prior knowledge from the trained diffusion model. We condition with an application-specific encoder that learns to extract meaningful information on user-provided scribbles. The method generates diverse and high-quality colorized images
3
Philbrick, Gregory Eric. "Color Relationship Transfer for Digital Painting." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5552.
Анотація:
A digital painter uses reference photography to add realism to a scene. This involves making n colors in a painting relate to each other more like n corresponding colors in a photograph, in terms of value and temperature. Doing this manually requires either experience or tedious experimentation. Color relationship transfer performs the task automatically, recoloring n regions of a painting so they relate in value and temperature more like n corresponding regions of a photograph. Relationship transfer also has applications in computational photography. In fact, it introduces a new paradigm for image editing in general, based on treating an image's fundamental relationships.
4
Jeong, Kideog. "OBJECT MATCHING IN DISJOINT CAMERAS USING A COLOR TRANSFER APPROACH." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/434.
Анотація:
Object appearance models are a consequence of illumination, viewing direction, camera intrinsics, and other conditions that are specific to a particular camera. As a result, a model acquired in one view is often inappropriate for use in other viewpoints. In this work we treat this appearance model distortion between two non-overlapping cameras as one in which some unknown color transfer function warps a known appearance model from one view to another. We demonstrate how to recover this function in the case where the distortion function is approximated as general affine and object appearance is represented as a mixture of Gaussians. Appearance models are brought into correspondence by searching for a bijection function that best minimizes an entropic metric for model dissimilarity. These correspondences lead to a solution for the transfer function that brings the parameters of the models into alignment in the UV chromaticity plane. Finally, a set of these transfer functions acquired from a collection of object pairs are generalized to a single camera-pair-specific transfer function via robust fitting. We demonstrate the method in the context of a video surveillance network and show that recognition of subjects in disjoint views can be significantly improved using the new color transfer approach.
5
Thornton, A. L. "Colour object recognition using a complex colour representation and the frequency domain." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301911.
6
Mazauric, Serge. "Modèles spectraux à transferts de flux appliqués à la prédiction de couleurs sur des surfaces imprimées en demi-ton." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES064/document.
Анотація:
La protection des documents fiduciaires et identitaires contre la fraude exige le développement d’outils de contrôle fondés sur des effets visuels sans cesse renouvelés, difficiles à contrefaire (même pour un expert ... de la contrefaçon !). Ce projet de recherche s’inscrit dans cette problématique et vise à apporter des solutions originales via l’impression de supports diffusants d’une part, et le développement de modèles de rendu visuel d’autre part. Les effets visuels recherchés sont des ajustements de couleurs entre les deux faces d’un imprimé lorsque celui-ci est observé par transparence devant une source lumineuse. Pour obtenir facilement des ajustements de couleurs quelles que soient les couleurs visées, il est capital d’avoir un modèle à disposition, permettant de calculer les quantités d’encre à déposer. Un modèle doit être capable de prédire les facteurs spectraux de réflexion et de transmission du support imprimé en décrivant les phénomènes de diffusion optique présents en pratique dans les couches d’encre et le support. Nous nous intéressons plus particulièrement aux imprimés translucides contenant des couleurs en demi-ton des deux côtés de la surface avec pour objectif de prédire le rendu visuel pour diverses configurations d’observation. Pour cela, nous proposons une nouvelle approche basée sur l’utilisation de matrices de transfert de flux pour prédire les facteurs spectraux de réflexion et de transmission des imprimés lorsqu’ils sont éclairés simultanément des deux côtés. En représentant le comportement optique des différents composants d’un imprimé par des matrices de transfert, la description des transferts de flux entre ces composantes s’en trouve simplifiée. Ce cadre mathématique mène à la construction de modèles de prédiction de couleurs imprimées en demi-ton sur des supports diffusants. Nous montrons par ailleurs que certains modèles existants, comme le modèle de Kubelka-Munk ou encore le modèle de Clapper-Yule, peuvent également être formulés en termes de matrices de transfert. Les résultats obtenus avec les modèles proposés dans ce travail mettent en évidence des qualités de prédiction équivalentes, voire supérieures, à celles qu’on retrouve dans l’état de l’art, tout en proposant une simplification de la formulation mathématique et de la description physique des échanges de flux. Cette simplification fait de ces modèles des outils de calcul qui s’utilisent très facilement, notamment pour la détermination des quantités d’encre à déposer sur les deux faces de l’imprimé afin d’obtenir des ajustements de couleursThe protection of banknotes or identity documents against counterfeiting demands the development of control tools based on visual effects that are continuously renewed. These visual effects become thus difficult to counterfeit even by an expert forger ! This research tries to deal with that issue. Its objective is to bring new solutions using on the one side, the printing of diffusing materials, and on the other side the development of visual rendering models that can be observed. The visual effects that are sought-after are the color matching on both sides of a printed document when observed against thelight. To easily obtain a color matching, whatever the colors that are aimed for, it is essential to have a model that helps in calculating the quantity of ink to be left on the document. A model must be used to predict the spectral reflectance and the transmittance factors of the printed document by describing the phenomena of optical diffusion really present in the ink layers and in the document. We shall focus our interest especially on translucent printed documents that have halftone colors on both sides. Our goal here is to predict the visual rendering in different configurations of observation. To that end, we are offering a new approach based on the use of flux transfer matrices to predict the spectral reflectance and transmittance factors of prints when they are simultaneously lit up on both sides. By representing with transfer matrices the optical behavior of the different components present in a printed document, we see that the description of flux transfer between these elements is thus simplified. This mathematical framework leads to the construction of prediction models of halftone printed colors on diffusing materials. We also show that some existing models, such as the Kubelka-Munk or the Clapper-Yule models, can also be formulated in transfer matrices terms. The results that we get with the models used in this work make apparent identical prediction quality and in some cases even better ones to the ones found in the state of the art, while offering a simplification of the mathematical formulation and the physical description of the flux transfer. This simplification thus transforms these models into calculation tools that can easily be used especially for the choice of quantities of ink that must be left on both sides of the document in order to obtain color matching
7
Muhammad, Imran. "Colorizing Grey Scale Images." Thesis, Högskolan Dalarna, Datateknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:du-6181.
Анотація:
The purpose of this thesis is to develop a working methodology to color a grey scale image. This thesis is based on approach of using a colored reference image. Coloring grey scale images has no exact solution till date and all available methods are based on approximation. This technique of using a color reference image for approximating color information in grey scale image is among most modern techniques.Method developed here in this paper is better than existing methods of approximation of color information addition in grey scale images in brightness, sharpness, color shade gradients and distribution of colors over objects.Color and grey scale images are analyzed for statistical and textural features. This analysis is done only on basis of luminance value in images. These features are then segmented and segments of color and grey scale images are mapped on basis of distances of segments from origin. Then chromatic values are transferred between these matched segments from color image to grey scale image.Technique proposed in this paper uses better mechanism of mapping clusters and mapping colors between segments, resulting in notable improvement in existing techniques in this category.
8
Nilsson, Linus. "Quality and real-time performance assessment of color-correction methods : A comparison between histogram-based prefiltering and global color transfer." Thesis, Mittuniversitetet, Avdelningen för informationssystem och -teknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-33877.
Анотація:
In the field of computer vision and more specifically multi-camera systems color correction is an important topic of discussion. The need for color-tone similarity among multiple images that are used to construct a single scene is self-evident. The strength and weaknesses of color- correction methods can be assessed by using metrics to measure structural and color-tone similarity and timing the methods. Color transfer has a better structural similarity than histogram-based prefiltering and a worse color-tone similarity. The color transfer method is faster than the histogram-based prefiltering. Color transfer is a better method if the focus is a structural similar image after correction, if better color-tone similarity at the cost of structural similarity is acceptable histogram-based prefiltering is a better choice. Color transfer is a faster method and is easier to run with a parallel computing approach then histogram-based prefiltering. Color transfer might therefore be a better pick for real-time applications. There is however more room to optimize an implementation of histogram-based prefiltering utilizing parallel computing.
9
Furman, Gary S. "The contribution of charge-transfer complexes to the color of kraft lignin." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/5644.
10
Edsborg, Karin. "Color Coded Depth Information in Medical Volume Rendering." Thesis, Linköping University, Department of Science and Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1823.
Анотація:
Contrast-enhanced magnetic resonance angiography (MRA) is used to obtain images showing the vascular system. To detect stenosis, which is narrowing of for example blood vessels, maximum intensity projection (MIP) is typically used. This technique often fails to demonstrate the stenosis if the projection angle is not suitably chosen. To improve identification of this region a color-coding algorithm could be helpful. The color should be carefully chosen depending on the vessel diameter.
In this thesis a segmentation to produce a binary 3d-volume is made, followed by a distance transform to approximate the Euclidean distance from the centerline of the vessel to the background. The distance is used to calculate the smallest diameter of the vessel and that value is mapped to a color. This way the color information regarding the diameter would be the same from all the projection angles.
Color-coded MIPs, where the color represents the maximum distance, are also implemented. The MIP will result in images with contradictory information depending on the angle choice. Looking in one angle you would see the actual stenosis and looking in another you would see a color representing the abnormal diameter.
11
Delafield, Susan J. "Development of tissue and protoplast culture techniques for Impatiens walleriana Hook. f. with a view to the transfer of yellow flower colour." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59575.
Анотація:
Impatiens walleriana Hook.f. is a popular bedding plant with a variety of flower colours excepting yellow. Transfer of this characteristic could be achieved through somatic hybridization, thus this study was an attempt to establish the basic parameters of tissue and protoplast culture. The condition of the stock plants and surface sterilisation techniques are important for this species. Most tissues responded to trials for callus induction with rhizogenesis. Evaluation of media and plant growth regulator combinations revealed that axillary shoot proliferation was most efficient on MS medium with 3.0 mg/L BAP and 0.1 mg/L IBA. Protoplast isolation was most effective in 0.5% w/v cellulase and 0.25% w/v pectinase with 0.25 M mannitol and 0.25 M glucose yielding 2.70 $ times$ 10$ sp5$ protoplasts per gram of leaf tissue. The presence of mucous, raphids and excessive debris inhibited successful culture of leaf mesophyll protoplasts. Cotyledon protoplasts show promise for such investigations.
12
Kuo, Wen-Guey. "Quantification of metamerism and colour constancy." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/15373.
Анотація:
Reliable colour constancy by industry for colour conducted to quantify metamerism. and metamerism indices are highly desired quality control. Two experiments were the degree of colour constancy and In the colour constancy experiment, 240 wool samples were prepared and scaled using a magnitude estimation method by a panel of 5 experienced observers under sources D65, A and TL84. 2 corresponding data sets derived from the experimental results were used to test various chromatic adaptation transforms. The results clearly show that the BFD transform gave the most precise prediction than the other transforms. Attempts were also made to derive 4 new transforms from four independent data sets. These gave similar performance as that of the BFD, but overcome the BFO's problem (incapable of predicting some of the high saturated colours). Hence, these transforms should be used with confidence for predicting the degree of colour constancy. This experimental results were also used to test various uniform colour spaces and colour appearance models. The Hunt94 model gave the most precise prediction to the colourfulness and hue results. Modification was made to its lightness scale for improving the fit. In the metamerism experiment, 76 pairs of wool samples were prepared and assessed with 20 observations using a grey scale under 7 sources: D65, A, TL84, TL83, P27, W and WW. The experimental results were used to test 3 types of illuminant metamerism indices derived here. It was found that calculating colour difference using 3 colour difference formulae, i.e. CMC, BFD and CIE94 gave the most precise prediction to the visual results. The degree of precision is quite satisfactory in comparison with typical observer precision. A new standard deviate observer (SDO) was also derived. This together with the CIE SDO and 1964 Observer were tested using the author's and the Obande's data. The results showed that the new SDO predicted results more accurate than those from the other two CIE Observers. An Observer Metamerism Index (OMI) was also derived to indicate the degree of metamerism based upon the new SDO. The results showed that the new SDO was more suitable for indicating the degree of observer metamerism.
13
Rewinska, Dorota Barbara. ""Towards Information Transfer : Competing Processes in Two-Colour Molecular Dyads"." Thesis, University of Newcastle upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525041.
14
Koenigbauer, Lee Ann. "EFFECTS OF ARTICULATION AGREEMENTS ON TRANSFER STUDENTS OF COLOR AT A PREDOMINANTLY WHITE UNIVERSITY." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1142553231.
15
Shvadchak, Volodymyr. "Two-color fluorescent dyes for sensing peptide interactions : application to the retroviral proteins." Strasbourg, 2009. https://publication-theses.unistra.fr/public/theses_doctorat/2009/SHVADCHAK_Volodymyr_2009.pdf.
16
Geary, Kevin Thomas. "Color Feature Integration with Directional Ringlet Intensity Feature Transform for Enhanced Object Tracking." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1479835464285204.
17
AUDAN, ALAIN. "Status de l'acetyl- et de la glutathion-transferases chez les porteurs d'adenomes colo-rectaux : etude preliminaire." Nantes, 1994. http://www.theses.fr/1994NANT204M.
18
Sayer, James Richard. "Preferred levels of image sharpness and their relation to image structure in thermal dye transfer prints." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07132007-143150/.
19
Hristova, Hristina. "Example-guided image editing." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S119/document.
Анотація:
Les contributions de cette thèse sont divisées en trois parties principales. Dans la partie 1, nous proposons une méthode locale utilisant une distribution GGM pour approcher les distributions des images en les subdivisant en groupe de pixels que nous appelons dorénavant clusters. L'idée principale consiste à déterminer quelle caractéristique (couleur, luminance) est plus représentative pour une image donnée. Puis nous utilisons cette caractéristique pour subdiviser l'image en clusters. Quatre stratégies de mise en correspondance des clusters de l'image d'entrée avec ceux de l'image cible sont proposées. Ces stratégies ont pour but de produire des images photoréalistes dont le style ressemble à celui de l'image cible (dans notre cas le style d'une image est défini en termes de couleur et luminosité). Nous étendons le principe de transfert de couleur au transfert simultané de couleur et de gradient. Afin de pouvoir décrire las distributions de couleur et de gradient par une seule distribution, nous adoptons le modèle MGGD (multivariate generalized Gaussian distributions). Nous proposons une nouvelle transformation de distribution MGGD pour des applications de traitement d'image telles que le transfert multi-dimensionnel de caractéristiques d'image, de couleur, etc. De plus, nous adoptons aussi un modèle de distribution plus précis (distribution Beta bornée) pour représenter des distributions de couleur et de luminosité. Nous proposons une transformation de distribution Beta qui permet d'effectuer un transfert de couleur entre images et qui s'avère plus performante que celles basées sur les distributions Gaussiennes. Dans la partie 2, nous introduisons une nouvelle méthode permettant de créer des images HDR à partir d'une paire d'images, l'une prise avec flash et l'autre pas. Notre méthode consiste en l'utilisation d'une fonction de luminosité (brightness) simulant la fonction de réponse d'une caméra, et d'une nouvelle fonction d'adaptation de couleur (CAT), appelée CAT bi-locale (bi-local CAT), permettant de reproduire les détails de l'image flash. Cette approche évite toutes les limitations inhérentes aux méthodes classiques de création d'images HDR. Dans la partie 3, nous exploitons le potentiel de notre adaptation bi-locale CAT pour diverses applications d'édition d'image telles que la suppression de bruit (dé-bruitage), suppression de flou, transfert de texture, etc. Nous introduisons notre nouveau filtre guidé dans lequel nous incorporons l'adaptation bi-locale CAT dans la partie 3This thesis addresses three main topics from the domain of image processing, i.e. color transfer, high-dynamic-range (HDR) imaging and guidance-based image filtering. The first part of this thesis is dedicated to color transfer between input and target images. We adopt cluster-based techniques and apply Gaussian mixture models to carry out a more precise color transfer. In addition, we propose four new mapping policies to robustly portray the target style in terms of two key features: color, and light. Furthermore, we exploit the properties of the multivariate generalized Gaussian distributions (MGGD). in order to transfer an ensemble of features between images simultaneously. The multi-feature transfer is carried out using our novel transformation of the MGGD. Despite the efficiency of the proposed MGGD transformation for multi-feature transfer, our experiments have shown that the bounded Beta distribution provides a much more precise model for the color and light distributions of images. To exploit this property of the Beta distribution, we propose a new color transfer method, where we model the color and light distributions by the Beta distribution and introduce a novel transformation of the Beta distribution. The second part of this thesis focuses on HDR imaging. We introduce a method for automatic creation of HDR images from only two images - flash and non-flash images. We mimic the camera response function by a brightness function and we recover details from the flash image using our new chromatic adaptation transform (CAT), called bi-local CAT. That way, we efficiently recover the dynamic range of the real-world scenes without compromising the quality of the HDR image (as our method is robust to misalignment). In the context of the HDR image creation, the bi-local CAT recovers details from the flash image, removes flash shadows and reflections. In the last part of this thesis, we exploit the potential of the bi-local CAT for various image editing applications such as image de-noising, image de-blurring, texture transfer, etc. We propose a novel guidance-based filter in which we embed the bi-local CAT. The proposed filter performs as good as (and for certain applications even better than) state-of-the art methods
20
Jain, Dimpal. "Women of color student leaders the role of race and gender in community college transfer readiness /." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=2025611511&sid=7&Fmt=2&clientId=1564&RQT=309&VName=PQD.
21
Jorna, Gerard C. "Modulation transfer function measurements, image quality metrics, and subjective image quality for soft-copy color images." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-10022007-145249/.
22
Pattinson, Victoria A. "The transfer, storage and release of water colour in a reservoired catchment." Thesis, University of Huddersfield, 1994. http://eprints.hud.ac.uk/id/eprint/4679/.
Анотація:
In recent years discoloured water has become a matter of growing concern to water resource managers. Discoloured water is a major source of consumer complaints and is expensive in capital and recurrent costs. The treatment of water discolouration is believed to be associated with a number of health issues, such as Alzheimer's disease. In particular, discoloured water, upon chlorination, is believed to produce carcinogens. The principal aim of this research has been to consider and manage water colour within an entire reservoir catchment system; Thornton Moor Reservoir, the study area, has experienced some of the highest values of colour in the Yorkshire Water Region, and has been an area of significant concern and cost to Yorkshire Water Services. Apparently homogenous subcatchments can produce marked differences in the colour of runoff data. This research has involved an investigation into the relationship between the subcatchment tributary water colour and catchment morphology. The relationships established were used to generate a predictive model for water colour such that areas of high water colour could be identified without intensive sampling. The initial phase of this study considered the transfer network involved in bringing the colour from the catchment to the reservoir. This has involved an analysis of the spatial and temporal variation of water discolouration within the catchment. The consistency of the spatial variation of water colour between the tributaries has been utilised to develop a management protocol which is presently being implemented at Thornton Moor in order to minimise the level of discolouration, whilst maintaining water supplies. Edwards (1987), describes the reservoir as the second line of defence in the protection of water supplies in direct supply reservoirs. No research to date has considered the role of the reservoir in the storage, transmission and release of discoloured water. Empirical evidence at Thornton Moor Reservoir suggests that for the majority of the year, the reservoir operates as a buffer to colour; however at certain times of the year it appears actively to increase the colour entering the treatment works. In considering the entire catchment system, it has been possible to develop a transferable staged approach to catchment management.
23
Chan, Tat Leung. "Application of liquid crystal thermography in heat transfer characteristics of slot jet impingement." Thesis, Nottingham Trent University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267018.
24
Paul, Daniel Earnest James. "Coat of Many Colors - Specificity of GalNAc Transferase Family of Isoenzymes." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1586253427484438.
25
Guducu, Hasan Volkan. "Building Detection From Satellite Images Using Shadow And Color Information." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609920/index.pdf.
Анотація:
A method for detecting buildings from satellite/aerial images is proposed in this study. The aim is to extract rectilinear buildings by using hypothesize first verify next manner. Hypothesis generation is accomplished by using edge detection and line generation stages. Hypothesis verification is carried out by using
information obtained both from the color segmentation of HSV representation of the image and the shadow detection stages&rsquooutput. Satellite/aerial image is firstly filtered to sharpen the edges. Then, edges are extracted using Canny edge detection algorithm. These edges are the input for the Hough Transform stage which will produce line segments according to these extracted edges. Then, extracted line segments are used to generate building hypotheses. Verification of these hypotheses makes use of the outputs of the HSV color segmentation and shadow detection stages. In this study, color segmentation is processed on the HSV representation of the satellite/aerial image which is less sensitive to illumination. In order to perform the shadow detection, the basic information which is shadow areas have higher value of saturation component and lower value of value component in HSV color space is used and according to this information a mask is applied to the HSV representation of the image to produce shadow pixels. The proposed method is implemented as software written in MATLAB programming software. The approach was tested in several different areas. The results are encouraging.
26
Faggembauu, Débora. "Heat transfer and fluid-dynamics in double and single skin facades." Doctoral thesis, Universitat Politècnica de Catalunya, 2006. http://hdl.handle.net/10803/6690.
Анотація:
Una proporción muy importante del presupuesto energético total de los países europeos es destinado al consumo energético del sector de la edificación, tanto en el ámbito doméstico como terciario. Debido a que esta tendencia continúa en aumento, es de vital importancia optimizar los edificios tanto desde el punto de vista de las envolventes térmicas, como de las instalaciones térmicas y las condiciones de operación y funcionamiento.Esta tesis incide fundamentalmente en el diseño eficiente de la fachada, ya que éste es uno de los principales elementos que determinan el comportamiento térmico de los edificios. No sólo actúa como barrera entre las condiciones externas e internas, sino que el diseño eficiente de la misma, contribuye en forma relevante a la reducción del consumo de calefacción, aire acondicionado, ventilación e iluminación. Asimismo, es un elemento que incide notablemente en las condiciones de salubridad y confort.
Actualmente, existe un gran auge del uso de fachadas completamente hechas de vidrio, este tipo de construcción presenta una serie de ventajas arquitectónicas y estéticas, pero desde el punto de vista térmico pueden representar problemas de sobrecalentamientos y pérdidas de energía importantes, tanto en las áreas mediterráneas como en otras zonas climáticas. En este sentido, las fachadas de doble piel, compuestas por dos capas separadas por un canal de aire, usado para evacuar o aprovechar la energía solar absorbida por la fachada, pueden representar una opción de diseño válida para solventar esta problemática. Asimismo, este tipo de diseño puede producir unas condiciones de confortabilidad adecuadas debido a la reducción de las temperaturas de las superficies interiores de las fachadas.
El objetivo de esta tesis es el de contribuir al estudio de sistemas pasivos en general, y fachadas avanzadas en particular. Para ello, se ha desarrollado una herramienta numérica para la simulación de fachadas de edificios de simple y doble piel. La principal característica de este código es la de asumir un comportamiento unidimensional y transitorio. Las ecuaciones gobernantes (continuidad, momentum y conservación de la energía) son resueltas mediante la aplicación del método de volúmenes finitos. Las fachadas incluyen elementos arquitectónicos novedosos, como materiales de cambio de fase, aislamiento transparente, superficies selectivas y colectores solares con acumuladores integrados en la superficie de las fachadas. En la tesis, se describen las características de los modelos físicos y matemáticos implementados y se definen parámetros instantáneos e integrados que describen el comportamiento térmico de las fachadas.
Los modelos numéricos implementados han sido sujetos a procesos de verificación y validación en diferentes formas: i) por comparación de los resultados numéricos con los obtenidos para situaciones simplificadas que cuentan con solución analítica, ii) por comparación con parámetros globales tabulados en la literatura de ciertas configuraciones de fachadas, y iii) por comparación de los resultados numéricos con los obtenidos experimentalmente en celdas de ensayo sometidas a diferentes condiciones climáticas.
Se presentan resultados de estudios paramétricos de diferentes configuraciones de fachadas y aplicaciones del código numérico para la optimización del diseño de fachadas de edificios emblemáticos del entorno. Como acciones futuras, se prevé la conexión de este tipo de simulaciones con otras de más alto nivel, bidimensionales, para optimizar zonas concretas de las fachadas.
A significant proportion of the total national energy budget of european countries goes toward energy consumption in buildings, therefore the efforts addressed to optimize building's thermal behaviour are of vital importance. In this sense, facades play a fundamental role. Not only do they act as barriers between external and internal conditions, but they can also help to reduce the consumption of energy for heating, ventilation and air conditioning. Moreover, they can help to produce healthy and comfortable indoor conditions. The use of large, transparent areas in facades is a common current practice. Despite the architectural interest of these glazed areas, in Mediterranean climatic conditions they are responsible for building overheating. In these zones, double-skin envelopes made up of two layers of glass separated by an air channel -to collect or evacuate the solar energy absorbed by the facade- are considered to be a design option that could resolve this issue. In other climatic conditions, large heat losses may constitute the most determinant factor. Anyway, the comfort parameters are influenced by the large transparent areas, also in this design aspect, double skin facades may contribute to obtain more comfortable and pleasant living spaces.
The objectives of this thesis are to give a step forward in the study and numerical analysis of passive systems in general, and advanced facades in particular. A one-dimensional and transient numerical code for the simulation of double and single skin facades including advanced technological elements, like phase change materials, transparent insulation and facade integrated collectors-accumulators has been developed. The features of the physic and mathematical models implemented are described and instantaneous or integratedperformance parameters describing thermal behaviour of the facades are defined. The numerical models implemented within the numerical tool have been subjected to a verification and validation process in different forms: by comparing the numerical results with those obtained for simplified situations with analytical solutions, with tabulated global performance coefficients of simple façade configurations and with the results of other building simulation codes. Experimental research has been carried out in test cells situated at different geographical locations, thus they were subjected to different climatic conditions. The main objective of the developed numerical code is to simulate advanced facades in order to assess the long term performance, and to account with a virtual tool to test passive designs, including challenging innovations.
The applications of the numerical tool described in this thesis, for the optimisation of facades of real buildings are presented. As future actions, the link of the one-dimensional simulations produced by this numerical tool with a multi-dimensional simulation of specific zones of the facades is foreseen.
27
Haigh, James Archer. "The application of Fourier transform Raman spectroscopy to problems of industrial interest." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307084.
28
Gatti, Pruthvi Venkatesh, and Krishna Teja Velugubantla. "Contrast Enhancement of Colour Images using Transform Based Gamma Correction and Histogram Equalization." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-14424.
Анотація:
Contrast is an important factor in any subjective evaluation of image quality. It is the difference in visual properties that makes an object distinguishable from other objects and background. Contrast Enhancement method is mainly used to enhance the contrast in the image by using its Histogram. Histogram is a distribution of numerical data in an image using graphical representation. Histogram Equalization is widely used in image processing to adjust the contrast in the image using histograms. Whereas Gamma Correction is often used to adjust luminance in an image. By combining Histogram Equalization and Gamma Correction we proposed a hybrid method, that is used to modify the histograms and enhance contrast of an image in a digital method. Our proposed method deals with the variants of histogram equalization and transformed based gamma correction. Our method is an automatically transformation technique that improves the contrast of dimmed images via the gamma correction and probability distribution of luminance pixels. The proposed method is converted into an android application. We succeeded in enhancing the contrast of an image by using our method and we have tested for different alpha values. Graphs of the gamma for different alpha values are plotted.
29
Babbar, Naveen. "Regulation and function of spermidine/spermine N¹ acetyl transferase (SSAT) in colon carcinogenesis." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289966.
Анотація:
Epidemiological data suggest that non-steroidal anti-inflammatory drugs (NSAIDs) have anti-tumorigenic activities against colorectal cancer. NSAIDs work by inhibiting cyclooxygenases (COX) enzyme. Sulindac, a NSAID prodrug, is metabolized into pharmacologically active sulfide and sulfone derivatives. Microarray analysis was used to detect COX independent effects of sulindac on gene expression in human colorectal cells. Spermidine/spermine N 1-acetyl transferase (SSAT) gene, which encodes a polyamine catabolic enzyme, was one of the genes induced by clinically relevant sulindac sulfone concentrations. Promoter analysis and mutational studies were done to map the sulindac sulfone dependent response sequences in SSAT 5' flanking sequences, which led to the identification of two Peroxisome Proliferator Activated Receptors (PPARs) response elements (PPREs) in the SSAT gene. PPRE-2 is required for the induction of SSAT by sulindac sulfone and is specifically bound by PPARgamma in the Caco-2 cells, while PPRE-1 is not required for the induction of SSAT by sulindac sulfone, but can be bound by both PPARdelta and PPARgamma. Clinically relevant concentrations of sulfone reduced intracellular polyamine levels, inhibited cell growth and induced apoptosis in colon cancer cells. Further, only sulindac sulfone induced apoptosis could be partially rescued by exogenous polyamines. Upon evaluating other NSAIDs for their action on SSAT gene expression, it was found that they induce SSAT mRNA in either a COX dependent or independent mechanism in colon cancer cells. Studies with physiologically relevant concentrations of aspirin show that these concentrations can induce SSAT expression thereby leading to a decrease in polyamine levels. Activating mutations in K-ras, which is a late process in colon carcinogenesis, led to the suppression of SSAT expression in the Caco-2 cells due to the inhibition of PPARgamma by ERK. K-ras didn't have any effect on the induction of SSAT by sulindac sulfone but partially abolished the apoptosis caused by sulindac sulfone, indicating a possible role of mutant K-ras in sulindac resistant colon polyps. Sulindac sulfone, or Exisulin(TM) have been recently used in clinical trials for the prevention of colon, lung and prostate cancer. The data shown here, suggest that one of the mechanisms, by which sulindac sulfone could act as a chemopreventive agent is to induce the expression of SSAT thereby leading to a decrease in the intracellular polyamines. This reduction in polyamines plays an important part in the apoptosis induced by sulindac sulfone in the colon cancer cells. Further, induction of SSAT seems to a general mechanism for different NSAIDs like aspirin, indomethacin, ibuprofen, sulindac and celecoxib in colon cancer. Aspirin is able to induce SSAT and decrease intracellular polyamines at physiological concentrations, which can lead to a significant reduction in adenoma recurrence. Also, activated K- ras suppressed SSAT, but was not able to abolish the induction of SSAT by sulindac sulfone indicating the potential of using sulindac sulfone in colon cancer chemoprevention.
30
Eslinger, Kimberly Lane Runyan Timothy J. ""-- And all the men knew the colors of the sea-- " : historical and archaeological investigation of the SS Commodore, Ponce Inlet, Florida /." Access via ScholarShip, 2005. http://hdl.handle.net/10342/1113.
Анотація:
Thesis (M.A)--East Carolina University, 2005.Presented to the faculty of the Department of History. Advisor: Timothy Runyan. Includes bibliographical references (leaves [134]-141). Also available via the World Wide Web. Adobe reader required.
31
Kay, Susan Barbara. "Radiative transfer modelling for sun glint correction in marine satellite imagery." Thesis, University of Exeter, 2011. http://hdl.handle.net/10036/3523.
Анотація:
Remote sensing is a powerful tool for studying the marine environment; however, many images are contaminated by sun glint, the specular reflection of light from the water surface. Improved radiative transfer modelling could lead to better methods for estimating and correcting sunglint. This thesis explores the effect of using detailed numerical models of the sea surface when investigating the transfer of light through the atmosphere-ocean system. New numerical realisations that model both the shape and slope of the sea surface have been created; these contrast with existing radiative transfer models, where the air-water interface has slope but not elevation. Surface realisations including features on a scale from 3 mm to 200 m were created by a Fourier synthesis method, using up to date spectra of the wind-blown sea surface. The surfaces had mean square slopes and elevation variances in line with those of observed seas, for wind speeds up to 15 m/s. Ray-tracing using the new surfaces gave estimates of reflected radiance that were similar to those made using slope statistics methods, but significantly different in 41% of cases tested. The mean difference in the reflected radiance at these points was 19%, median 7%. Elevation-based surfaces give increased sideways scattering and reduced forward scattering of light incident on the sea surface. The elevation-based models have been applied to estimate pixel-pixel variation in ocean colour imagery and to simulate scenes viewed by three types of sensor. The simulations correctly estimated the size and position of the glint zone. Simulations of two ocean colour images gave a lower peak reflectance than the original values, but higher reflectance at the edge of the glint zone. The use of the simulation to test glint correction methods has been demonstrated, as have global Monte Carlo techniques for investigating sensitivity and uncertainty in sun glint correction. This work has shown that elevation-based sea surface models can be created and tested using readily-available computer hardware. The new model can be used to simulate glint in a variety of situations, giving a tool for testing glint correction methods. It could also be used for glint correction directly, by predicting the level of sun glint in a given set of conditions.
32
McKee, David. "Nuclear Transparency and Single Particle Spectral Functions from Quasielastic A(e,e'p) Reactions up to Q2=8.1 GeV2." Washington, D.C : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Energy Research ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/824828-CBQre3/native/.
Анотація:
Thesis (Ph.D.); Submitted to New Mexico State Univ., Las Cruces, NM (US); 1 May 2003.Published through the Information Bridge: DOE Scientific and Technical Information. "JLAB-PHY-03-22" "DOE/ER/40150-2731" David McKee. 05/01/2003. Report is also available in paper and microfiche from NTIS.
33
Liu, Shuk Ming. "Single nucleotide polymorphism in human microsomal glutathione s-transferase gene and colorectal cancer /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?BIOL%202003%20LIU.
Анотація:
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.Includes bibliographical references (leaves 95-105). Also available in electronic version. Access restricted to campus users.
34
Girotti, Priscila Azevedo. "Análise morfoquantitativa dos neurônios mioentéricos e submucosos imunorreativos aos receptores P2X2 e P2X7, ao óxido nítrico sintase (NOS), à calretinina, à calbindina e à colina acetil transferase (ChAT) do colo distal de ratos submetidos à desnutrição e à renutrição protéica." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/42/42131/tde-09102008-125826/.
Анотація:
Este projeto, analisou a distribuição dos neurônios nos plexos mioentérico (PM) e submucoso (PS) imunorreativos aos receptores P2X2 (ir) e P2X7 (ir), calbindina (Calb-ir), calretinina (Calr-ir), colina acetil transferase (ChAT-ir) e ao óxido nítrico sintase (NOS-ir) do colo distal de ratos submetidos à desnutrição a renutrição protéica. Utilizaram-se colos distais de ratos nutridos (N42), desnutridos (D42) e renutridos (RN42). Os resultados do plexo PM, demonstraram que 100% dos neurônios Calb-ir, Calr-ir, ChAT-ir e NOS-ir, expressavam os receptores P2X2-ir e P2X7-ir nos três grupos. A densidade neuronal no PM, demonstrou um aumento de 20% a 97% dos neurônios receptores P2X2-7-ir, Calr-ir, ChAT-ir e NOS-ir e no PS foi de 29% a 75%, ambos D42 e recuperação no RN42. O perfil neuronal P2X7-ir, Calb-ir, Calr-ir e ChAT-ir do PM demonstrou diminuição de 28% a 40% e no PS os neurônios P2X2-7-ir, Calb-ir e ChAT-ir de 19% a 47% no D42. Concluí-se que, a desnutrição afeta os neurônios entéricos havendo recuperação na renutrição, podendo influenciar nas funções gastrintestinais.The aim of the work was to analyze the distal colon myenteric (MN) and submucous (SN) neurons immunoreactive for P2X2-7 receptors, calbindin (Calb-ir), calretinin (Calr-ir), choline acetyltransferase (ChAT) and nitric oxide synthase (NOS) of the animals submitted to undernutrition and refeeding proteic. Distal colon was used from nourished (N42), undernourished (D42) and refeeding (RN42) rats. The results have shown 100% coexpression of the myenteric and submucous Calb-ir, Calr-ir, ChAt-ir e NOS-ir neurons with P2X2-7-ir receptors. The MN density have shown increase of the 20% and 97% of the P2X2-7-ir, Calr-ir, ChAT-ir e NOS-ir neurons of the D42 group, and the SN have been increased 29% a 75% in the D42 group. In the MN neuronal profile have shown decrease P2X7-ir, Calb-ir, Calr-ir and ChAT-ir neurons of the 28% to 40% and in the PS P2X2-7-ir, Calb-ir and ChAT-ir of the 19% a 47% neurons in the D42 group. I concluded that, the undernutrition affects the enteric neurons and there was recuperation in the refeeding, this can influence the gastrintestinal functions.
35
Chen, Hui-Hsin, and 陳惠欣. "Applying Discrete Wavelet Transform to Color Transfer Algorithm for Color Images." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/bdx857.
Анотація:
碩士國立臺中科技大學
資訊工程系碩士班
102
This study applied Discrete Wavelet Transform (DWT) to color transform for color images, that is different from the used complex statistical methods to calculate and determine during changing colors for the original image. The multi-resolution digital signals from LL3 values of DWT were applied to calculate the characteristics of Hue channel in HSV color space. As important information, the mean and standard deviation of LL3 are taken to determine the weights for original image and reference image individually. The Hue values of the original image were changed according to the LL3 possession of two images. According to the experimental results, the proposed color transform technology for color images can effectively use wavelet transform to obtain representative features. Even there are great color differences between original image and reference image, the original image could still be color changed without weird or unchangeable color.
36
Hsu, Shih-Kun, and 許世坤. "Transfer Image Color to Video." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/28557711836863587853.
Анотація:
碩士國立暨南國際大學
資訊工程學系
93
Applying one image’s color style to a video is a promising technology for video applications. One simple solution is treating a video as a sequence of image frames and then applying the image-based color transfer algorithm on every frame. However, the transferred quality as a whole usually lacks of smoothness and harmony in color style, because the scene of the destination frame varies and is gradually different from that of the color source image (for example, during a video with panning or zooming operation). Although manually specifying the similar regions before transferring (the swatch mechansim) can get better quality, it is not suitable for our video case due to the high cost of manpower involved. To solve the visual defects and ease the cost, we propose an Adaptive Frame Pass (AFP) algorithm that is based on ιαβ color space to adaptively consider the processing parameters from not only the color source image, but the destination frame. Besides, we also discuss the problem when we apply color transfer mechanism to YCbCr color space, the working color space of JPEG and MPEG. We propose an objective “evaluation sequence” measurement to evaluate the smoothness quality of processed video shot. The experimental result shows that our approach produces perceptually more coherent, smooth, natural color style in video than the image-based approach does.
37
Wan, Hui-Wen, and 萬惠雯. "A Mechanism for Affective Color Transfer Based on Skin Color Preservation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/32746908428672454677.
Анотація:
碩士國立中央大學
資訊工程學系
101
As we know, color, one of important features for composing images, can affect people on emotional level. Photographers and designers usually enhance desired color in their works to convey feeling. Editing color theme of images achieves the goal to change the emotion evoked by images. In this thesis, a method to change the emotion in images by editing color content called affective color transfer is proposed, we focus on implementing color transfer in images to make overall color theme of input image be similar with reference image. The result can be evaluated by affective analysis proposed in our work, and the affective class of result image is consistent with reference image. The proposed skin color preserving phase prevents skin color from over-modification in original color transfer. Furthermore, we attach importance about the harmony of output image, combing both the opacity of input and output image in color transfer to reduce visual distortion. The proposed method performs well in not only general images but also images which exit human. Another mechanism is affective analysis in images. First, we define affective classes and then extract affective colors in the image to classify the affective class. By using saliency map, we extracted the affective color in the image exactly, and result of affective analysis is improved. Finally, experiment results of affective analysis and affective color transfer have confirmed the effectiveness of proposed method. Affective classes predicted by affective analysis accord with the emotion evoked by images. We compare the algorithm of color transfer between proposed method and other methods, where our method performs better.
38
Yao-Hsien, Huang. "Effective Color Transfer Algorithms for Images." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0005-1708200614264800.
39
Huang, Yen-Chao, and 黃彥超. "Image Enhancement and Color Transfer Techniques." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/93686374360834703505.
Анотація:
碩士國立臺灣大學
電信工程學研究所
101
In this thesis, we study two image processing techniques including image enhancement and color transfer. With the development of technology, people can use digital camera or cell phone to capture the photo in daily life. However, the results of these easily captured images are often not as good as expected. In order to make images clear and pleasing, one can use image enhancement techniques to adjust images. Contrast correction and sharpness enhancement are the two common methods of image enhancement. Traditional contrast enhancement is global correction. Global correction provides good results for either overexposed or underexposed images. But it produces disappoint results for images which have both bright region and dark region. Local correction can make both bright region and dark region clearer. To enhance sharpness, traditional unsharp masking uses low pass filter and usual addition and multiplication. However, traditional unsharp masking suffers from halo artifact and out-of-range problem. A general unsharp masking adopts edge preserving filter and generalized addition and multiplication to resolve above problems. After studying kinds of image enhancement techniques, we implement and compare these methods. In the applications of post-production industry and image composition, the color characteristic should be consistent between two or more images. Color transfer plays an important role in those of applications. Traditional method uses statistical matching to perform color transfer. When two images are too different, this method produces unnatural results. Histogram-based method improves the color similarity between the synthetic image and target image, but it suffers from grain artifact. We analyze and compare the methods as mentioned above, then provide an improvement of color transfer. Furthermore, we apply our color transfer method to perform image re-coloring for colorblindness. Hopefully to make a color-blind can enjoy more beautiful images. Finally, we apply our color transfer method to perform enhancement for underwater images. Ocean engineering researchers can get a clearer underwater image by our method.
40
Huang, Yao-Hsien, and 黃耀賢. "Effective Color Transfer Algorithms for Images." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/51575212288370065060.
Анотація:
博士國立中興大學
資訊科學系所
94
This dissertation presents three color transfer algorithms for images. The first algorithm is an automatic, swatch-based, color transfer (ACT) algorithm for two still images. It modifies colors in the source image by borrowing the color characteristics from the target image. The algorithm consists of three processes: a swatch generation process, a swatch matching and color transfer process, and a swatch boundary transition process. This swatch-based algorithm proceeds on color transfer with no user intervention, and produces visually plausible resultant images. Experimental results demonstrate that the ACT is superior to Reinhard et al.’s original user-intervention color transfer algorithm. The second algorithm presents a novel automatic color transfer approach for image sequence (ISCT). This ISCT algorithm renders an image sequence with color characteristics borrowed from three user-given target images. The algorithm completes the color transfer task with three processes: a forward color space conversion process, an image sequence process, and an image sequence animation process. Given a single input image (I1) and three target images (T1, T2, T3) as inputs, the algorithm produces an image sequence {Si} with color mood variations. The ISCT algorithm is fast. It achieves the goal of rendering an image sequence in several seconds. In addition, the user interface developed provides much freedom to visualize the rendered image sequence. Given only three target images, the ISCT algorithm demonstrates its feasibility to produce an image sequence with visually plausible effects. This algorithm is automatic, effective, and expeditious, and is appropriate for many applications. Finally, we recommend a generalized color transfer algorithm for image sequences (GISCT). There are two major differences between the GISCT algorithm and the ISCT algorithm. The first major difference is that the GISCT algorithm proposes a new color transfer approach (NCT) to eliminate the appearance of over-transformation, which occurs when the source and target image are not compatible. The second difference is that we present a generalized color variation curve (GCVC) in the GISCT algorithm. Specifically, a B-spline curve is automatically generated to interpolate color statistics, which provides more flexible control over in-between images. Experimental results show that the GISCT algorithm generates results in several seconds. It renders an image sequence with versatile color variations, producing more visually plausible appearance than those generated by the ISCT algorithm. In conclusion, the ACT algorithm produces results that are superior to its closest competitor. The novel ISCT and the GISCT algorithms generate an image sequence with color mood variation. These algorithms contribute significantly to the topic of color transfer in the computer graphics community.
41
Huang, S. C., and 黃紹傑. "Effective Color Transfer Using Transformation Techniques." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/86318354159886579745.
Анотація:
碩士國立中興大學
資訊科學研究所
93
Colour theory has been the subject of intensive research these years in computer graphics community. Recently, researchers presented a color transfer algorithm in which needs two images, source and target images, inputted by users. The algorithm automatically delivers colors of target image onto source image. The resulting image’s color distributions will be similar to target’s. Reinhard’s algorithm has three advantages: 1) easy to understand, 2) easy to practice, and 3) less computational time. However, it has a distinct drawback, that is, as the source image’s color distributions does not match with target’s, the resulting image may not conform to our visual experiences. In this thesis, we followed Reinhard’s color transfer algorithm and employed a transformation technique to improve the drawback. The main concept is that we attempted to vary source image’s color distributions . Firstly, we let images be fit in with target’s distribution, and then we execute the color transfer operator. We used statistical transformation techniques, power and modulus transformations, to change the distributions of source image to avoid yielding an unnatural resultant image. The experimental results show that our algorithm produces a better result than Reinhard’s. This is due to the fact that we solve the unnatural problem so that the result can be adopted to our visual experiences, always the algorithm’s effects. In spite of solving the drawback efficiently, our algorithm can also employ successful images shown in Reinhard’s algorithm, providing more varied-style results. In addition, the transformation techniques can also be used to images to balance their luminance distributions. Overall, our proposed algorithm retains the advantages of Reinhard’s, and eliminates the unnatural effects. The benefit of our algorithm is to provide an easy way to simulate varied scenes with different applications such as movie, photography, and astronomy.
42
Cheng-Chung, Chang, and 張正忠. "Color Transfer for Image and Video." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/23191949994783192759.
Анотація:
碩士亞洲大學
資訊與設計學系碩士班
97
With the popularization of the digital photography equipments, it becomes more and more convenient to acquire digital images and videos. Owing to the characteristics of being easily corrected and edited, the demand of image processing rises continuously. In the domain of image processing, color transfer is a novel skill of color processing. As image transfer is concerned, this study introduces an easy and fast method on image transfer as well as two interesting ways of video transfer. The study aims at enhancing the color matching relationship between a target image and a reference image. Referring to video transfer, the first proposed method is Single Scene Color Transfer for Video Algorithm. This algorithm aims at proceeding to develop color style transfer in accordance with the scenery video of single scene. The said algorithm has advantages of simplicity and high efficiency as a result of deriving from Reinhard et al.’s method. The second proposed method is Adaptability Color Transfer for Video Algorithm. This algorithm aims at producing special effect of moderating the variation of color style with time. Finally, the results of the experiment provide the strong support for the proposed methods.
43
Hsieh, Chang-Hsi. "Multiple Color Transfer: Example-Based Photo Enhancement." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2607200710404200.
44
Hsieh, Chang-Hsi, and 謝昌熹. "Multiple Color Transfer: Example-Based Photo Enhancement." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/22239749441668911443.
Анотація:
碩士臺灣大學
資訊工程學研究所
95
One of the most common situations in photo editing is that users want some specific effects but don’t know how to achieve them. Nevertheless, they have an image in their mind about how the photo should be, which is derived from a better photo on similar subjects, or from their imagination. With this user motivation in mind, this thesis proposes a method for altering a photo’s color based on the coloring of another exemplary photo. Users simply set the requirement by drawing some pairs of brush strokes in corresponding regions and then the tool will perform the editing automatically. The goal of our tool is to enable the photo editor to easily alter the dissatisfied photo by referring the other acceptable photo. A suitable user interface have designed for drawing the corresponding regions between a source and one or more targets to transfer the desired color. Besides, in most general cases, users are just dissatisfied with a part of the photo, so our system allow users to edit their photo completely or partially by the same work flow, and our algorithm can preserve the satisfying or ex-editing region successfully. In this thesis, we find the region the user expect to edit by a graph cut optimization algorithm, and we have designed a new energy function which can consider the color and positional information simultaneously in this process. Additionally, a multiple color transfer method is developed to estimate the different influence of a set of transfer functions on a pixel and accumulate the influences to alter the pixel. Moreover, a image-guide optimization is used to increase the coherence in regions and eliminate the artifacts near edges in the result. We also display a variety application of our tool in this thesis, and Our system can produce accurate results that match users’ expectations. More importantly, the tool is very easy to learn; no photography or photo editing knowledge is required, and users don’t need to change their habit of taking photos.
45
Tung, Tzu-Chia, and 董子嘉. "Color Transfer Visual Cryptographic Scheme without Permutation Key." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/38611744522943146071.
Анотація:
碩士國立東華大學
資訊工程學系
104
Visual cryptography scheme (VCS) is a kind of cryptography that can be directly decoded by human visual system when transparent films are stacked. It requires no computation for decryption. VCS is often implemented as a threshold (k, n) scheme, which a secret image is subdivided into n shadow images (called shadows). Any k shadows can be simply superimposed together to recover the secret image. However, (k1) or fewer shadows cannot obtain any secret information. This novel stacking-to-see property of VCS can be applied on various applications. Recently, Luo et al. introduced a notion of color transfer visual cryptographic scheme (CTVCS) by embedding the information of color channels R, G and B into the conventional (k, n)-VCS. Luo et al.’s (k, n)-CTVCS can visually decode the halftoned secret image by stacking any k shadow images like the conventional (k, n)-VCS, and meanwhile it can obtain a high-quality color image. These visual qualities are good enough to be used in commercial products, e.g., the ChLCD display of electronic paper book and advertising board. However, the information of color channels are represented explicitly on shadows, and thus a key is used to permute color pixels to achieve the security. Therefore, Luo et al.’s (k, n)-CTVCS is, strictly speaking, not a threshold scheme because the recovery of the information of color channels is based on a permutation key. Because a halftoned image is transformed from a gray-level image by digital halftoning technique, and the intensities of color channels can be converted to a grayscale. Therefore, there definitely exists a tight relation between the intensities of color channels and the pixel value of a halftoned image. By using an inherent property of digital image, we propose a (k, n)-CTVCS with perfect security, and do not need permuting pixels. We formally define contrast and security conditions of a (k, n) - CTVCS. Also, we theoretically prove that our CTVCSs satisfy these conditions. Experiment results demonstrate the feasibility of our constructions. Keywords: Visual cryptography, Secret Sharing, Threshold scheme, Color transfer VCS, halftoned image.
46
Lee, Hong-Chang, and 李鴻昌. "Efficient and Reversible Color Transfer Algorithms Between Images." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/12203353257068237056.
Анотація:
博士國立中興大學
資訊科學研究所
93
A color transfer algorithm changes colors of the source image by referring to the color of the target image. Previous color transfer algorithms suffered from intensive and laborious works to select an appropriate source image to make the resultant image with plausible visual appearance. This paper presents two color transfer algorithms to make color transfer more efficient and versatile. The first algorithm we present is an efficient color transfer algorithm. In this algorithm, we propose a fuzzy classification technique to achieve the efficiency in color transfer. This technique automatically calculates the total fuzzy values, given a source image. Then, M candidate target images are then selected which contain the largest M fuzzy values from an image database with L images. Given these candidate target images, a user can then perform a color transfer process as desired, generating N number of resultant images ( ). Each resultant image thus generated is guaranteed to demonstrate satisfactory color transfer effects with visually plausible image appearance. Given a source image, our system can efficiently produce 5 candidate target images (M=5) from an image bank with 1280 images (L=1280) within 3 seconds. In addition, our system can perform the color transfer computing and produce a resultant image (512x512) within 40 seconds. The proposed algorithm is feasible to produce a great diversity of resultant images with satisfactory qualities. The second algorithm we present is a reversible color transfer algorithm. In this algorithm, we propose a Steganography technique to embed 12 floating point values, representing as 468 bits, into the resultant images when performing the color transfer. These values include the means and variances of the source and target images in the l color space. We also utilize a spread spectrum technique so that more than one copy of the information is embedded into the resultant image. This technique ensures that the source and target image can be retrieved from the resultant image with a negligible visual appearance. The proposed algorithm has a benefit in saving the memory space by storing the resultant image. Also, the users can perform color transfer as many times as they desired, producing versatile and plausible visual image by using a single color transferred image together with an image database. In conclusion, we present two color transfer algorithms in this thesis. These algorithms are feasible to produce a great diversity of versatile color transfer images with satisfactory qualities.
47
Chang, Shiang-Chun, and 張翔竣. "A Novel Method For Color Transfer Using Histogram." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/58528826483086320800.
Анотація:
碩士國立交通大學
多媒體工程研究所
97
In this thesis, we propose a novel method for color transfer using histogram. We can construct the histograms individually for both source and reference images based on the statistical analysis of them. After the construction of histograms, we perform segmentation in order to separate the histograms into multiple sections. According to the relationship of corresponding sections between the source and target images, we do color transfer from target to source. At the same time, there will be parameter interpolation between pairs of sections to solve the artifacts along the section boundary. In this way, we can transfer the color information from target image to source image and the result is better than the current methods.
48
Li, Long-Siang, and 李龍祥. "Example-based Color Transfer for Reversible Data Hiding." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/t78gah.
Анотація:
碩士國立中興大學
資訊科學與工程學系
106
Histogram shifting or difference expansion were two popular schemes used for reversible data hiding. Color transfer changes color in a source image by referring to color of the target image to produce a visually plausible resultant image. Color transfer provides an alternative approach to achieving the reversibility. In this thesis, we combine color transfer and message embedding to become a reversible data hiding algorithm. Specifically, we conceal a secret message generated by a secret key when producing the resultant image simultaneously. This approach formulates the resultant image so that it offers the feature of reversibility. Then, the resultant image is regarded as a new cover image on which secret message can be conveyed to produce a marked image. In our study, we employ the weighted modulus algorithm to conceal secret message, which is controlled by the parameters (n, M), where n represents pixels in a pixel cluster and M denotes a secret digit in M-ary notational system. In the receiver part, the secret message is extracted using the weighted modulus scheme with the same parameters. Then, we conceal a particular secret message generated by the same secret key, accomplishing the cover image recovery. The combination of color transfer and reversible data hiding provides reversibility as well as steganographic benefits. In particular, if we conceal a real secret message instead of a secret message generated by the secret key, then we produce a stego image simultaneously when we produce the resultant image. Surely, it is difficult for a malicious eavesdropper to detect whether secret message is embedded in the resultant image. Experimental results demonstrate that our scheme is feasible to provide both steganographic and reversible features. In comparison of the current state-of-the-art reversible algorithms using contrast enhancement, our approach offers a much larger embedding rate, while producing a stego/marked image with a high visual quality.
49
Cheng, Chun-kai, and 程俊凱. "Color Image Segmentation Technique Using Wavelets Transform." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/07768809361511149516.
Анотація:
碩士國立海洋大學
電機工程學系
91
Color images contain much homogenous regions information which can be divided into uniform regions by color characterization. There is no linear relationship among the color space transformations. In the previous, the color research, we found that most of researchers use gray level image segmentation methods to apply on color images. They totally ignore the color characterization. In recent years, some of them took the advantages of color to do segmentation in some device dependence color spaces. The goal of this research is to investigate an automatic image segmentation method which substitutes the traditional heuristic and intuited methods. We propose a color image segmentation technique using wavelet transform with multi-resolution technique. In accordance with the properties of color, we can segment color images in different color spaces to fulfill the functionality of color management. In segmentation process, we start from the toppest level, define the color of a pixel, and compare with the colors of neighboring pixels to decide the regions. After labeling the regions, we do inverse discrete wavelet to next level and label the regions level by level until reaching equal to original image. Then obtain a segmentation image with obvious boundary to achieve image segmentation. It is hoped that the research is much helpful in building a color management on the Internet, which is able to provide an automatic color management tool and standard for related industries. Keywords：Color Image、Segmentation、Wavelets、Multiresolution、Color Space
50
Le, Hoai-Nam, and 黎淮南. "Color to Grayscale Transform Preserving Maximum Information." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/19426495715898823556.
Анотація:
碩士逢甲大學
通訊工程所
98
Color-to-gray conversion in many applications requires preserving the visual appearance and feature discrimination of color images. The existing methods are still need of improvement in this aspect. We propose two color-to-gray conversion algorithms. One is the global mapping based and the other is the local-global mapping based. The proposed methods convert accurately various categories of color images to grayscale images, including natural images, computational images, and painting images. The global mapping scheme is simple and fast, yet it preserves feature discrimination and appropriate color order of color images. The local-global mapping scheme not only retains the visual appearance of the color image but also compensates the global mapping method for possible loss of color information. Experimental results show that the proposed methods produced perceptually accurate and preferred images when they were compared with other schemes.