Tesis: "Image transmission"

1

Wang, Limin. "Progressive image transmission." Thesis, University of Ottawa (Canada), 1988. http://hdl.handle.net/10393/5394.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

2

Salous, Mounther N. H. "Context-based image transmission." Thesis, University of Birmingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368121.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

3

Nelson, Christopher. "Contour encoded compression and transmission /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1613.pdf.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

4

Lim, Seng. "Image compression scheme for network transmission." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA294959.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

5

Chippendale, Paul. "Image transmission over time varying channels." Thesis, Lancaster University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266669.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

6

Lee, Bu-Sung. "Image transmission over the Cambridge Ring." Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/32908.

Texto completo

Resumen

Local Area Networks (LAN) are destined to play a rapidly increasing part in the transmission and distribution of a wide range of information, and this thesis describes the study of the problems concerning the transmission of coloured images over a particu1ar network, the Cambridge Ring. A colour image station has been developed for the use on the Cambridge Ring. It provides two main services: a high resolution freeze frame transmission and a medium resolution slow-scan image transmission.

Los estilos APA, Harvard, Vancouver, ISO, etc.

7

Iyengar, Giridharan. "Algorithms and architectures for progressive image transmission." Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6747.

Texto completo

Resumen

Transmission of images over low speed, low bandwidth channels has several applications. Examples include transmission of remote sensing images, scanning of vast global databases and facsimile transmission of printed material. In progressive image transmission, a low resolution image is first transmitted with as few bits as possible. The resolution of the transmitted image is then improved interactively upon viewer's request. Eventually, an exact copy of the original image is reconstructed. In this thesis, image coding techniques and parallel architectures are first reviewed followed by a review of progressive image transmission techniques. A software toolkit for progressive image transmission is then presented. This tool is user-friendly and permits rapid development of new algorithms and fast evaluations of different approaches for progressive image transmission. Unlike conventional techniques, it offers a convenient platform for performing both objective and subjective evaluations with ease. Two algorithms for progressive image transmission are then detailed. The first algorithm follows the coefficient scanning methodology. The second algorithm uses an iterative residual error feedback technique. An architecture which implements these algorithms in real-time is then presented. The software tool is used as the platform with which the comparative analysis between different algorithms are performed. Simulation results are reported for the proposed algorithms in terms of Peak Signal to Noise Ratio (PSNR). Simulation results indicate that the proposed algorithms perform better than JPEG-DCT in terms of subjective and objective quality. However, Gabor decomposition is computationally expensive and hence requires special purpose architectures for real-time implementation. The proposed architecture achieves a high efficiency of parallelism (99%) and implements the two algorithms for progressive image transmission in real-time. The architecture is simple and modular and hence can be easily implemented in VLSI as a codec.

Los estilos APA, Harvard, Vancouver, ISO, etc.

8

Caron, Steven. "Progressive image transmission by segmentation-based coding." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9933.

Texto completo

Resumen

Progressive image transmission, where an image builds up gradually, is gaining popularity in image database browsing applications. In these applications, a user might have to reject a large number of unwanted images before selecting the desired one. In such a case, the time required to identify the image contents becomes very important. In this thesis, we present a novel progressive image transmission technique based on a representation by segmentation. The technique preserves edges at low bit rates and is biased toward fast identification. An image is segmented into regions having constant intensity by applying a morphological operator: the watershed. The segmented image is gradually simplified using a graph. The simplifications are transmitted in the reverse order. At the decoder, the image is dynamically divided into an increasing number of regions as the transmission progresses. A subjective experiment was designed, and the recognition times of images transmitted with the proposed algorithm were compared with the recognition times of the same images transmitted with JPEG. The proposed method was found to result in faster recognition of image contents for almost all the images. Some work on the objective evaluation of coarse images is also presented.

Los estilos APA, Harvard, Vancouver, ISO, etc.

9

Khire, Sourabh Mohan. "Time-sensitive communication of digital images, with applications in telepathology." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29761.

Texto completo

Resumen

Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010. Committee Chair: Jayant, Nikil; Committee Member: Anderson, David; Committee Member: Lee, Chin-Hui. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Los estilos APA, Harvard, Vancouver, ISO, etc.

10

Wu, Zhi Qing. "Developing image enhancement and image transmission techniques for an Internet-oriented medical image processing system." Thesis, University of South Wales, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411625.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

11

Dansereau, Richard M. "Progressive image transmission using fractal and wavelet techniques with image complexity measures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ57505.pdf.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

12

Abraham, Arun S. "Bandwidth-aware video transmission with adaptive image scaling." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0001221.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

13

Huang, Xiaodong. "Image coding for transmission over wireless CDMA channels." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6372.

Texto completo

Resumen

This thesis provides a comparative analysis of sentencing patterns in two time periods separated by seventeen years. Research of this type has not been attempted previously, due to the limited availability of historical sentencing data. Using statistics obtained from the Royal Canadian Mounted Police's Fingerprint System from 1983--1984 and the Canadian Centre for Justice Statistics' Adult Criminal Court Survey for 1999--2000, this study examines whether recommendations made by various federal inquiries into sentencing have affected judicial decision-making at the trial court level. At the core of this discussion is an examination of those initiatives aimed at reducing the use of imprisonment as a sanction. Comparisons reveal that sentencing patterns in 1983--1984 differed significantly from those present in 1999--2000. In some cases, it appears as though the changes were in accordance with recommendations of the federal inquiries whereas in others, the patterns that were discovered seemed to indicate that judges ignored or even defied the directives given. With regard to the promotion of community sanctions, there was an overwhelming increase in the use of probation. In contrast, the findings with respect to the use of imprisonment were more ambiguous; while the overall decrease in the rate of incarceration had been a stated objective, the manner in which this reduction was achieved appears to contradict the recommendations of the inquiries. Essentially, this study shows that, despite the wealth of time and research devoted to the reform of the sentencing process in this country, the impact of these efforts on judicial practices has been minimal.

Los estilos APA, Harvard, Vancouver, ISO, etc.

14

Nellist, Peter David. "Image resolution improvement in scanning transmission electron microscopy." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361613.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

15

TORRES, CARLOS MARIO CORREA. "IMAGE TRANSMISSION THROUGH NOISY CHANNELS WITH LT CODES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=15886@1.

Texto completo

Resumen

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO Para transmissão da informação de maneira confiável, em canais com apagamento, foram criados os códigos LT (Luby Transform), uma das principais classes de códigos fontanais. Estes códigos não têm uma taxa fixa, em outras palavras, eles têm taxa versátil. Esta dissertação aborda o estudo da transmissão de imagens através de canal ruidoso, AWGN (Aditive White Gaussian Noise), com o uso de Códigos LT. Investigou-se o desempenho usando uma modulação BPSK, dois esquemas foram testados: Um esquema para canal que inclui apagamento (BESC) e um outro que foi proposto usando um código Hamming em série com um código LT. O esquema LT-Hamming apresentou um ganho de código maior que o esquema BESC e o código convolucional de semelhantes características. Foi testado o esquema LT-Hamming para diferentes tipos de imagens em um canal AWGN usando a técnica SPIHT para a compressão das imagens. Para obter uma medida objetiva da qualidade da imagem recuperada foi usado o parâmetro PSNR (Peak Sinal to Noise Ratio) e foram apresentadas algumas imagens com o objetivo de analisar sua qualidade através de uma inspeção visual. Dado que o código LT é versátil para o que diz respeito à taxa de código, foi proposto um método para método para atribuir diferentes níveis de proteção da informação codificada, UEP (Unequal Error Protection). To transfer reliably information in erasure channels, LT (Luby Transform) codes were created, they are part of the main class of fountain codes, this codes don’t have fixed rate, in other words, they have a versatile code rate. This thesis address to the study of images transmission through noisy channel, AWGN (Aditive White Gaussian Noise) using LT codes. We investigated the performance using a BPSK modulation, two schemes were tested: A scheme of channel that includes deletion (BESC) and another that was proposed, using a Hamming code in series with a LT code. The LT-Hamming scheme present a gain code larger than BESC scheme and convolutional codes of similar characteristics. Was tested LT-Hamming scheme for different types of images on AWGN channel using the SPIHT technique for images compression. To obtain an objective measure of image quality was used the PSNR (Peak Signal Noise Ratio) and some images were presented in order to analize its quality through visual inspection given that LT code is a versatile for what concern the code rate it was proposed a method to assign different protection levels to the code information, UEP (Unequal Error Protection).

Los estilos APA, Harvard, Vancouver, ISO, etc.

16

Zheng, Xing. "Ultrasound image processing and transmission for medical diagnosis /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?COMP%202003%20ZHENGX.

Texto completo

Resumen

Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003. Includes bibliographical references (leaves 66-69). Also available in electronic version. Access restricted to campus users.

Los estilos APA, Harvard, Vancouver, ISO, etc.

17

Khanna, Rajiv. "Image data compression using multiple bases representation." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-12302008-063722/.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

18

Bergön, Håkan. "VHDL modeling and simulation for a digital target imaging architecture for multiple large targets generation /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FBergon.pdf.

Texto completo

Resumen

Thesis (M.S. in Systems Engineering and M.S. in Software Engineering)--Naval Postgraduate School, September 2002. Thesis advisor(s): Douglas J. Fouts, Man-Tak Shing, Phillip E. Pace. Includes bibliographical references (p. 171-172). Also available online.

Los estilos APA, Harvard, Vancouver, ISO, etc.

19

Maguer, Alain. "Transmission d'images sous-marines par ultrasons : étude théorique et implantation temps réel de la portée codage-décodage de la chaîne de transmission." Lyon, INSA, 1985. http://www.theses.fr/1985ISAL0047.

Texto completo

Resumen

La transmission de données dans le milieu sous-marin et plus précisément une transmission d'images qui nécessite un grand débit d'information se fait généralement par l'intermédiaire d'un câble électrique. Cependant, au cours des deux dernières décennies de nombreux chercheurs et utilisateurs potentiels se sont beaucoup intéresses aux moyens de s'affranchir de celui-ci, qui présente certaines contraintes techniques et opérationnelles non négligeables, dans les transmissions sous-marines. L'examen comparatif des techniques ou moyens physiques susceptibles d'être appliqués dans le domaine sous-marin pour cette utilisation est incontestablement en faveur des ondes sonores, de préférence aux ondes électromagnétiques et optiques, trop limitées en portée par l'absorption et la diffusion du milieu. Cependant, la liaison acoustique présente comme principal inconvénient d'avoir une onde passante limitée. Les considérations, objets de cette étude portent donc principalement sur l'optimisation du système de transmission au niveau de la quantité minimale d'informations à transmettre sans dégradation notable de l'image. Avant de passer en revue les procédés de codage d'images les plus représentatifs et les mieux adaptés à notre problème, nous avons été amenés à examiner le système sous l'aspect purement acoustique afin de définir en particulier la valeur optimale de la fréquence porteuse (au niveau rapport signal à bruit) dont dépend en premier lieu la bande passante disponible. Nous avons ensuite étudié l'influence des erreurs de transmission ,(dues en grande partie aux trajets multiples) sur le format du message codé et développé en temps réel (sur microprocesseur Motorola 68 000) la partie codage décodage de la chaîne de transmission. Les cadences d'images obtenues sont d'une image toutes les 1,4 secondes.

Los estilos APA, Harvard, Vancouver, ISO, etc.

20

Packwood, R. A. "Progressive transmission and display of static images." Thesis, University of Warwick, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378276.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

21

Nelson, Christopher B. "Contour Encoded Compression and Transmission." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/1096.

Texto completo

Resumen

As the need for digital libraries, especially genealogical libraries, continues to rise, the need for efficient document image compression is becoming more and more apparent. In addition, because many digital library users access them from dial-up Internet connections, efficient strategies for compression and progressive transmission become essential to facilitate browsing operations. To meet this need, we developed a novel method for representing document images in a parametric form. Like other “hybrid" image compression operations, the Contour Encoded Compression and Transmission (CECAT) system first divides images into foreground and background layers. The emphasis of this thesis revolves around improving the compression of the bitonal foreground layer. The parametric vectorization approach put forth by the CECAT system compares favorably to current approaches to document image compression. Because many documents, specifically handwritten genealogical documents, contain a wide variety of shapes, fitting Bezier curves to connected component contours can provide better compression than current glyph library or other codebook compression methods. In addition to better compression, the CECAT system divides the image into layers and tiles that can be used as a progressive transmission strategy to support browsing operations.

Los estilos APA, Harvard, Vancouver, ISO, etc.

22

Jain, Amit. "Scalable image compression for database storage and transmission applications." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6934.

Texto completo

Resumen

In this thesis, we first define the concept of scalability and describe its three types, namely SNR, spatial and temporal scalability. This is followed by a review of the various techniques reported in the literature for achieving scalable image compression. We then investigate the algorithms for scalable image compression within the framework of JPEG standard. An extension to the hierarchical mode algorithm of JPEG is presented which provides an improved coding performance. This is followed by evaluation of the performance of these algorithms for image transmission over ATM networks. JPEG provides an efficient technique for achieving SNR scalability. However, JPEG algorithms do not provide a good coding performance for achieving spatial scalability at low bit rates. We propose a high performance algorithm based on wavelet transform and vector quantization for achieving spatial scalability. This algorithm ensures partial decodability of VQ labels by using multiple codebooks for image reconstruction, one for each spatial resolution. Our simulations indicate that the proposed algorithm provides spatial scalability at lower bit rates compared to the hierarchical mode of JPEG. (Abstract shortened by UMI.)

Los estilos APA, Harvard, Vancouver, ISO, etc.

23

Salehi, Doolabi Saeed. "Cubic-Panorama Image Dataset Analysis for Storage and Transmission." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24053.

Texto completo

Resumen

This thesis involves systems for virtual presence in remote locations, a field referred to as telepresence. Recent image-based representations such as Google map's street view provide a familiar example. Several areas of research are open; such image-based representations are huge in size and the necessity to compress data efficiently for storage is inevitable. On the other hand, users are usually located in remote areas, and thus efficient transmission of the visual information is another issue of great importance. In this work, real-world images are used in preference to computer graphics representations, mainly due to the photorealism that they provide as well as to avoid the high computational cost required for simulating large-scale environments. The cubic format is selected for panoramas in this thesis. A major feature of the captured cubic-panoramic image datasets in this work is the assumption of static scenes, and major issues of the system are compression efficiency and random access for storage, as well as computational complexity for transmission upon remote users' requests. First, in order to enable smooth navigation across different view-points, a method for aligning cubic-panorama image datasets by using the geometry of the scene is proposed and tested. Feature detection and camera calibration are incorporated and unlike the existing method, which is limited to a pair of panoramas, our approach is applicable to datasets with a large number of panoramic images, with no need for extra numerical estimation. Second, the problem of cubic-panorama image dataset compression is addressed in a number of ways. Two state-of-the-art approaches, namely the standardized scheme of H.264 and a wavelet-based codec named Dirac, are used and compared for the application of virtual navigation in image based representations of real world environments. Different frame prediction structures and group of pictures lengths are investigated and compared for this new type of visual data. At this stage, based on the obtained results, an efficient prediction structure and bitstream syntax using features of the data as well as satisfying major requirements of the system are proposed. Third, we have proposed novel methods to address the important issue of disparity estimation. A client-server based scheme is assumed and a remote user is assumed to seek information at each navigation step. Considering the compression stage, a fast method that uses our previous work on the geometry of the scene as well as the proposed prediction structure together with the cubic format of panoramas is used to estimate disparity vectors efficiently. Considering the transmission stage, a new transcoding scheme is introduced and a number of different frame-format conversion scenarios are addressed towards the goal of free navigation. Different types of navigation scenarios including forward or backward navigation, as well as user pan, tilt, and zoom are addressed. In all the aforementioned cases, results are compared both visually through error images and videos as well as using the objective measures. Altogether free navigation within the captured panoramic image datasets will be facilitated using our work and it can be incorporated in state-of-the-art of emerging cubic-panorama image dataset compression/transmission schemes.

Los estilos APA, Harvard, Vancouver, ISO, etc.

24

Dujon, Gregory Francis. "Calibration of incoherent optical fibre bundles for image transmission." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334005.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

25

Zeng, William Glenn. "Coded still image transmission over very slow fading channels." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37534.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

26

Wu, Zhenyu. "Joint source/channel coding for image and video transmission." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/282900.

Texto completo

Resumen

With the rapid growth of data communication infrastructure, there has been an increasing demand for multimedia communication services over the past years. This rapid growth has posed new requirements and challenges in many related research areas. This dissertation studies the problem of efficient and robust transmission of image and video contents over noisy channels. Firstly, joint source/channel coding algorithms are proposed for image transmission based on the new image coding standard JPEG2000. By combining the forward error correction capability provided by channel coding, together with the scalability and error resilience (ER) features provided by JPEG2000, the algorithm can achieve unequal error protection gains as well as robust source decoding for single image transmission over band-limited channels. Secondly, joint source/channel coding algorithms for multiple sources transmission over a common channel sharing a given total bandwidth are proposed. The algorithms exploit the rate-distortion diversity among multiple sources to optimally distribute a total bit rate given by the channel. It is demonstrated that both improved quality and reduced quality variance can be achieved at the receiver by the proposed algorithms. Finally, a robust image transmission scheme is proposed for packet erasure channels. The algorithm is based on the ER functionalities provided by JPEG2000 for robust source decoding. Together with the proposed interleaving scheme, some erasures can be recovered without channel coding.

Los estilos APA, Harvard, Vancouver, ISO, etc.

27

Xie, Xinwen. "Quality strategy and method for transmission : application to image." Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2251/document.

Texto completo

Resumen

Cette thèse porte sur l’étude des stratégies d’amélioration de la qualité d’image dans les systèmes de communication sans fil et sur la conception de nouvelles métriques d’évaluation de la qualité. Tout d'abord, une nouvelle métrique de qualité d'image à référence réduite, basée sur un modèle statistique dans le domaine des ondelettes complexes, a été proposée. Les informations d’amplitude et de phase relatives des coefficients issues de la transformée en ondelettes complexes sont modélisées à l'aide de fonctions de densité de probabilité. Les paramètres associés à ces fonctions constituent la référence réduite qui sera transmise au récepteur. Ensuite, une approche basée sur les réseaux de neurones à régression généralisée est exploitée pour construire la relation de cartographie entre les caractéristiques de la référence réduite et le score objectif.Deuxièmement, avec la nouvelle métrique, une nouvelle stratégie de décodage est proposée pour la transmission d’image sur un canal de transmission sans fil réaliste. Ainsi, la qualité d’expérience (QoE) est améliorée tout en garantissant une bonne qualité de service (QoS). Pour cela, une nouvelle base d’images a été construite et des tests d’évaluation subjective de la qualité de ces images ont été effectués pour collecter les préférences visuelles des personnes lorsqu’elles sélectionnent les images avec différentes configurations de décodage. Un classificateur basé sur les algorithmes SVM et des k plus proches voisins sont utilisés pour la sélection automatique de la meilleure configuration de décodage.Enfin, une amélioration de la métrique a été proposée permettant de mieux prendre en compte les spécificités de la distorsion et la préférence des utilisateurs. Pour cela, nous avons combiné les caractéristiques globales et locales de l’image conduisant ainsi à une amélioration de la stratégie de décodage.Les résultats expérimentaux valident l'efficacité des métriques de qualité d'image et des stratégies de transmission d’images proposées This thesis focuses on the study of image quality strategies in wireless communication systems and the design of new quality evaluation metrics:Firstly, a new reduced-reference image quality metric, based on statistical model in complex wavelet domain, has been proposed. The magnitude and the relative phase information of the Dual-tree Complex Wavelet Transform coefficients are modelled by using probability density function and the parameters served as reduced-reference features which will be transmitted to the receiver. Then, a Generalized Regression Neural Network approach is exploited to construct the mapping relation between reduced-reference feature and the objective score.Secondly, with the new metric, a new decoding strategy is proposed for a realistic wireless transmission system, which can improve the quality of experience (QoE) while ensuring the quality of service (QoS). For this, a new database including large physiological vision tests has been constructed to collect the visual preference of people when they are selecting the images with different decoding configurations, and a classifier based on support vector machine or K-nearest neighboring is utilized to automatically select the decoding configuration.Finally, according to specific property of the distortion and people's preference, an improved metric has been proposed. It is the combination of global feature and local feature and has been demonstrated having a good performance in optimization of the decoding strategy.The experimental results validate the effectiveness of the proposed image quality metrics and the quality strategies

Los estilos APA, Harvard, Vancouver, ISO, etc.

28

Kamaras, Konstantinos. "JPEG2000 image compression and error resilience for transmission over wireless channels." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://sirsi.nps.navy.mil/uhtbin/hyperion-image/02Mar%5FKamaras.pdf.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

29

Bingabr, Mohamed Gabr. "Robust method for the transmission of DCT coded images and image quality evaluation of the received images." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2002. http://wwwlib.umi.com/cr/syr/main.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

30

Chang, Michael Ming Yuen. "A computer-controlled system in transmission electron microscopy." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292941.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

31

Salzgeber, Anna. "The familial transmission of negative thinking patterns /." [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19298.pdf.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

32

Mazataud, Camille. "Error concealment for H.264 video transmission." Thesis, Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34715.

Texto completo

Resumen

Video coding standards such as H.264 AVC (Advanced Video Coding) rely on predictive coding to achieve high compression efficiency. Predictive coding consists of predicting each frame using preceding frames. However, predictive coding incurs a cost when transmitting over unreliable networks: frames are no longer independent and the loss of data in one frame may affect future frames. In this thesis, we study the effectiveness of Flexible Macroblock Ordering (FMO) in mitigating the effect of errors on the decoded video and propose solutions to improve the error concealment on H.264 decoders. After introducing the subject matter, we present the H.264 profiles and briefly determine their intended applications. Then we describe FMO and justify its usefulness for transmission over lossy networks. More precisely, we study the cost in terms of overheads and the improvements it offers in visual quality for damaged video frames. The unavailability of FMO in most H.264 profiles leads us to design a lossless FMO removal scheme, which allows the playback of FMO-encoded video on non FMO-compliant decoders. Then, we describe the process of removing the FMO structure but also underline some limitations that prevent the application of the scheme. Finally, we assess the induced overheads and propose a model to predict these overheads when FMO Type 1 is employed. Eventually, we develop a new error concealment method to enhance video quality without relying on channel feedback. This method is shown to be superior to existing methods, including those from the JM reference software and can be applied to compensate for the limitations of the scheme proposed FMO-removal scheme. After introducing our new method, we evaluate its performance and compare it to some classical algorithms.

Los estilos APA, Harvard, Vancouver, ISO, etc.

33

Fu, Deng Yuan. "ADAPTIVE DIGITAL IMAGE DATA COMPRESSION BY RECURSIVE IDPCM." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275350.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

34

Andersen, Brian S. "An Investigation of a Positive Engagement, Continuously Variable Transmission." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1878.pdf.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

35

Chen, Wu-hsiang Jonas. "Error-resilient techniques for packet video communications /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/5850.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

36

Gagalis-Hoffman, Kelly. "Belief transmission through family storytelling : implications for family therapy /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1505.pdf.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

37

Chan, Mun Kit. "Atmospheric transmission windows for high energy short pulse lasers." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FChan%5FMun.pdf.

Texto completo

Resumen

Thesis (M.S. in Combat Systems Technology)--Naval Postgraduate School, December 2003. Thesis advisor(s): Donald L. Walters, Alfred W. Cooper. Includes bibliographical references (p. 73-74). Also available online.

Los estilos APA, Harvard, Vancouver, ISO, etc.

38

Somervell, Andrew Robert Donald. "Methods of Direct Image Transmission." 2001. http://hdl.handle.net/2292/691.

Texto completo

Resumen

Two interesting new methods for direct image transmission via optical communication channels are presented. In the first of these, the images are transmitted via a serial optical link using phase only encoding and decoding of the image. This is achieved by encoding the image using a set of binary phase sequences and sending the sum of the field from all the pixels through the link. The image is reconstructed by first spatially separating the beam into output pixels and impressing phase sequences conjugate to those used to encode the image onto each pixel. Then the output pixels are combined with a coherent reference beam and the resulting intensities are averaged over the length of the sequences to recover the image. This method is discussed theoretically and it is shown that the number of image pixels able to be transmitted is limited by the dynamic range of the system. An experiment performed to demonstrate the principle of this technique is presented. This is done by transmitting a sixteen pixel image using a liquid crystal spatial light modulator to impart the phase sequences. Reasonably good image transmission is observed. In the second image transmission technique the image is sent directly through a multimode optical waveguide. In this method the amplitudes of the waveguide modes are matched to those of the image pixels by sampling the image correctly and performing an appropriate transform. At the output, the waveguide modes are spatially separated into discrete pixels with amplitudes proportional to those of the original image pixels. This is done by performing another transform and sampling appropriately. Image transmission through a perfectly reflecting slab waveguide and a dielectric slab waveguide is discussed theoretically. Experiments which demonstrate image transmission using this technique and highlight the difficulties encountered are also presented.

Los estilos APA, Harvard, Vancouver, ISO, etc.

39

Lin, Ting Wei, and 林定緯. "Wireless Image Transmission System Design." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/85371658715680565699.

Texto completo

Resumen

碩士 國立清華大學 工程與系統科學系 103 The wireless image transmission system proposed in this thesis follows the specification of first commercialized wireless capsule endoscopy (WCE) in terms of image. The system can be integrated and fulfills wireless image transmission with proper coding. In the beginning of the development of WCE, modules integration is needed based on the product specification to get the best configuration parameter, and then miniaturization can be implemented. Therefore, the research can be seen as pre-development stage of WCE. Besides, it can also be integrated into other applications of real-time image transmission. First, Arduino board including the ATmega328 microcontroller designed by Atmel is used. The adoption of Arduino is because of its lower cost and wider applications. Second, ArduCam camera shield including OV2640 sensor manufactured by OmniVision Technologies is used. The shield with the functions of frame buffering and image compression can transform original image data to JPEG format. Third, a wireless transmission path by HC-05 bluetooth module is built. It can reach the wireless image transmission by transferring JPEG file to computer and image will be displayed on the Hyper-terminal software. Finally, the wireless image transmission system is formed by integrating the camera shield, control board, and bluetooth module. The specifications in terms of image such as resolution and frame rate are 320×240 and 2.17fps.

Los estilos APA, Harvard, Vancouver, ISO, etc.

40

LIOU, MING HUA, and 劉明華. "3D image wireless transmission system." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/76157729662521171933.

Texto completo

Resumen

碩士 萬能科技大學 影像顯示技術研究所 102 This paper focuses on a real-time 3D image transmission system It makes use of dual image sensors to capture 3D images, the use of two wireless transceiving system, namely RF wireless transmitting and receiving modules for image transmission and infrared transmitting and receiving circuits for viewing frame synchronization , respectively, The wireless transmission System prevails 2.4GHz wireless transmission technology, infrared circuit is simple, within the effective reception range, multiple receiving circuits work well. the radio transmission signal is the signal will not cause mutual interference with IR. This paper presents interlaced 3D image wireless transmission system implementation. It uses two image sensors to simulate the spacing of human eyes shoot, the video signal processing circuit offers staggered screen switching. With wireless transmission module sending the images to 3D projector, infrared circuit sends signals to achieve synchronization with interleaved glasses, you can instantly see the formation of a real-time 3D imaging video

Los estilos APA, Harvard, Vancouver, ISO, etc.

41

Lai, Yi-Shuan, and 賴乙瑄. "Single Image Dehazing Using Transmission Heuristic with Optimal Transmission Map." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/63146530493399830597.

Texto completo

Resumen

碩士 國立清華大學 資訊工程學系 100 The poor visibility in bad weather condition, such as haze and fog, is caused by the stationary atmospheric effects of suspended particles. The challenge of restoring such atmospheric effects, usually referred to as “dehazing”, from single image mainly comes from the double uncertainty of scene depth and scene radiance. Approximation of the transmission, which encodes the scene depth information, is the most significant step to solve the dehazing problem. In this thesis, we propose to derive an optimal transmission map under a heuristic assumption in the dehazing model. The proposed objective function guarantees to have a global optimal solution, and the obtained transmission map is accurate and preserves the depth-consistency of the same object. Finally, we further take the difference in light wavelengths transmission between three color channels into account. Using the optimal transmission map and considering the different wavelengths of each color channel, our method recovers haze-free images with excellent result.

Los estilos APA, Harvard, Vancouver, ISO, etc.

42

Wu, Chung-Kun, and 吳忠坤. "Robust image transmission over ATM networks." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/94602061905957237744.

Texto completo

Resumen

碩士 中原大學 電機工程學系 88 In this thesis, a robust image transmission system design algorithm over ATM networks is presented. The algorithm consists of two parts: the image coding algorithm for layered transmission and the transmission schemes for ATM network based on the coding algorithm. Among all of the digital image compression techniques, the embedded zerotree wavelet (EZW) algorithm and the set partitioning in hierarchical tree (SPIHT) algorithm have been shown to be very effective for image coding. However, EZW technique and SPIHT technique might not be effective for implementation of layered image transmission (LIT) scheme. This is because these techniques do not have both SNR and resolution scalabilities. In this thesis, we apply layered embedded zerotree wavelet (LEZW) technique, which extend from EZW, and present a novel SPIHT technique, termed layered SPIHT (LSPIHT) technique, for realization the LIT system having both resolution and SNR scalabilities. These algorithms allow various decoders devices with different resolution and rate requirement to share a common image encoder. Next, we apply layered image coding schemes to implement scalable and robust image transmission over ATM networks. In the ATM networks, cells with different degrees of importance can be associated with different QoS’s to reduce the overall cost for transmitting image data. In the LEZW algorithm and LSPIHT algorithm, the bit streams in the lower layers usually have higher degree of importance. We allocate the bit stream in the lowest layer the best QoS. For other layers, different QoS’s assigned based on the their significance. Therefore, the LEZW-encoded bit streams and the LSPIHT-encoded bit streams are suited for transmissions over ATM networks. In this thesis, we propose three schemes for the transmission of LEZW-encoded bit streams and LSPIHT-encoded bit streams over ATM channels: serial scheme, parallel scheme, and hybrid serial/parallel scheme. The serial scheme only allows at most two QoS guarantees. The parallel scheme supplies most QoS guarantees. However the parallel scheme is more complex than the serial scheme. The hybrid serial/parallel scheme has the advantages of the serial scheme and the parallel scheme. The hybrid serial/parallel scheme allows different layers have different QoS. Moreover, the hybrid serial/parallel scheme is simpler than the parallel scheme. Simulation results show that the LEZW-based LIT system has superior rate-distortion performance as compared with usual EZW-based simulcast systems. The same conclusion can be found when LSPIHT-based LIT system is compared to the SPIHT-based simulcast systems. Moreover, since the LEZW-based LIT and the LSPIHT-based LIT have the advantages of graceful degradation for the cell losses, the system can effectively achieve robust transmission.

Los estilos APA, Harvard, Vancouver, ISO, etc.

43

盧乃誠. "A perceptually tuned progressive image transmission." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/27911410955144442209.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

44

Lin, Da Sen, and 林達生. "Progressive Image Transmission Using Vector Quantization." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/61674422613455997630.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

45

Town, Jammym, and 湯政明. "Image Phone Transmission and Monitoring System." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/78704545800784154962.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

46

Lin, Da Sheng, and 林達生. "Progressive image transmission using vector quantization." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/46923593334770968250.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

47

陳智祿. "A Radio-based Image Transmission Technology." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/68793371842718186399.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

48

CHANG, CHEN-HUI, and 張振輝. "Long Distance Wireless Digital Image Transmission." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/90902885835458523387.

Texto completo

Resumen

碩士 元智大學 電機工程學系 92 During the past few years of rapid development in the IT industry, the demand for new wireless applications and better image quality has increased steadily. With the proliferation of LCDs and improvement in the design of ICs, quality image transmission is quickly becoming an essential part of our daily life. But when sending images over long distances, traditional methods of wireless transmission are unable to meet the dual requirements of maintaining image quality while ensuring security of the broadcast. This paper discusses the use of Frequency Hopping Spread Spectrum (FHSS) technology in wireless transmission, addressing technical issues related to data security, long-distance transmission and bandwidth, and presents actual test results.

Los estilos APA, Harvard, Vancouver, ISO, etc.

49

Lin, Louis H., and 林宏. "Adaptive Image Transmission by Strategic Decomposition." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/13345799958626012269.

Texto completo

Resumen

碩士 淡江大學 資訊工程學系 92 Progressive image transmission (PIT) transmits the most significant portion of a picture, followed by less important parts. The mechanism can be used in web-based applications to save users’ browsing time. Most PIT methods use the same pixel interpolation scheme for the entire picture, without considering the differences in different portions. We analysis the efficiency of pixel interpolation schemes and test several strategic decomposition mechanisms. Our contributions result in an adaptive image transmission mechanism, which take the differences of pictures and picture portions into consideration. The overall bit rates can be reduced significantly, with reasonable PSNR values. An error recovery procedure is also implemented to guarantee the transmitted pictures can be fully recovered.

Los estilos APA, Harvard, Vancouver, ISO, etc.

50

Lu, Nai-Cheng, and 盧乃誠. "A Perceptually Tuned Progressive Image Transmission." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/11826189471220779182.

Texto completo

Resumen

碩士 大同工學院 電機工程研究所 83 In this thesis, a progressive image transmission algorithm is proposed, which is designed to remove perceptual redundancy inherent in an image is quantified by just noticeable distoration (JND) through a perceptual model. The perceptual model is obtained by incorporating the well-known characteristics of human perception including contrast sensitivity and spatial masking. The proposed algorithm not only maintains high image quality with high compression ratio, but also reduces the required the computation complexity. The experimental results show that the proposed algorithm has excellent performance that is superior to conventional hierarchial image compression algorithm and the JPEG progressive algorithm.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Tesis sobre el tema "Image transmission"

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros