Tesis sobre el tema "Metric quality assessment"
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Mariana, Valerie Ruth. "The Multidimensional Quality Metric (MQM) Framework: A New Framework for Translation Quality Assessment". BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4312.
Texto completoHettiarachchi, Don Lahiru Nirmal Manikka. "An Accelerated General Purpose No-Reference Image Quality Assessment Metric and an Image Fusion Technique". University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1470048998.
Texto completoSnow, Tyler A. "Establishing the Viability of the Multidimensional Quality Metrics Framework". BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5593.
Texto completoBerry, Michael CSE UNSW. "Assessment of software measurement". Awarded by:University of New South Wales. CSE, 2006. http://handle.unsw.edu.au/1959.4/25134.
Texto completoPreiss, Jens [Verfasser], Philipp [Akademischer Betreuer] Urban, Edgar [Akademischer Betreuer] Dörsam y Michael [Akademischer Betreuer] Goesele. "Color-Image Quality Assessment: From Metric to Application / Jens Preiss. Betreuer: Philipp Urban ; Edgar Dörsam ; Michael Goesele". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/1110980949/34.
Texto completoGao, Zhigang. "Image/video compression and quality assessment based on wavelet transform". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1187195053.
Texto completoR, V. Krishnam Raju Kunadha Raju. "Perceptual Image Quality Prediction Using Region of Interest Based Reduced Reference Metrics Over Wireless Channel". Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13631.
Texto completoKhaustova, Darya. "Objective assessment of stereoscopic video quality of 3DTV". Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S021/document.
Texto completoThe minimum requirement for any 3D (stereoscopic images) system is to guarantee visual comfort of viewers. Visual comfort is one of the three primary perceptual attributes of 3D QoE, which can be linked directly with technical parameters of a 3D system. Therefore, the goal of this thesis is to characterize objectively the impact of these parameters on human perception for stereoscopic quality monitoring. The first part of the thesis investigates whether visual attention of the viewers should be considered when designing an objective 3D quality metrics. First, the visual attention in 2D and 3D is compared using simple test patterns. The conclusions of this first experiment are validated using complex stimuli with crossed and uncrossed disparities. In addition, we explore the impact of visual discomfort caused by excessive disparities on visual attention. The second part of the thesis is dedicated to the design of an objective model of 3D video QoE, which is based on human perceptual thresholds and acceptability level. Additionally we explore the possibility to use the proposed model as a new subjective scale. For the validation of proposed model, subjective experiments with fully controlled still and moving stereoscopic images with different types of view asymmetries are conducted. The performance is evaluated by comparing objective predictions with subjective scores for various levels of view discrepancies which might provoke visual discomfort
Rossholm, Andreas. "On Enhancement and Quality Assessment of Audio and Video in Communication Systems". Doctoral thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00604.
Texto completoSanches, Silvio Ricardo Rodrigues. "Avaliação objetiva de qualidade de segmentação". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-26062014-111553/.
Texto completoAssessment of video segmentation quality is a problem seldom investigated by the scientific community. Nevertheless, recent studies presented some objective metrics to evaluate algorithms. Such metrics consider different ways in which segmentation errors occur (perceptual factors) and its parameters are adjusted according to the application for which the segmented frames are intended. In this work: i) we demonstrate empirically that the performance of existing metrics changes according to the segmentation algorithm; ii) we developed a subjective method to evaluate segmentation quality; and iii) we contribute with a new objective metric derived on the basis of experiments from subjective method in order to adjust the parameters of two bilayer segmentation algorithms found in the literature when these algorithms are used for compose scenes in Immersive Teleconference environments.
Slanina, Martin. "Metody a prostředky pro hodnocení kvality obrazu". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233489.
Texto completoOlgun, Ferhat Ramazan. "Evaluation Of Visual Quality Metrics". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613733/index.pdf.
Texto completoBegazo, Dante Coaquira. "Método de avaliação de qualidade de vídeo por otimização condicionada". Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-09032018-152946/.
Texto completoThis dissertation proposes two objective metrics for estimating human perception of quality for video subject to transmission degradation over packet networks. The first metric just uses traffic data while the second one uses both the degraded and the reference video sequences. That is, the latter is a full reference (FR) metric called Quadratic Combinational Metric (QCM) and the former one is a no reference (NR) metric called Viewing Quality Objective Metric (VQOM). In particular, the design procedure is applied to packet delay variation (PDV) impairments, whose compensation or control is very important to maintain quality. The NR metric is described by a cubic spline composed of two cubic polynomials that meet smoothly at a point called a knot. As the first step in the design of either metric, the spectators score a training set of degraded video sequences. The objective function for designing the NR metric includes the total square error between the scores and their parametric estimates, still regarded as algebraic expressions. In addition, the objective function is augmented by the addition of three equality constraints for the derivatives at the knot, whose position is specified within a fine grid of points between the minimum value and the maximum value of the degradation factor. These constraints are affected by Lagrange multipliers and added to the objective function to obtain the Lagrangian, which is minimized by the suboptimal polynomial coefficients determined as a function of each knot in the grid. Finally, the knot value is selected that yields the minimum square error. By means of the selected knot value, the final values of the polynomial coefficients are determined. On the other hand, the FR metric is a nonlinear combination of two popular metrics, namely, the Peak Signal-to-Noise Ratio (PSNR) and the Structural Similarity Index (SSIM). A complete second-degree two-variable polynomial is used for the combination since it is sensitive to both constituent metrics while avoiding overfitting. In the training phase, the set of values for the coefficients of this polynomial is determined by minimizing the mean square error to the opinions over the training database. Both metrics, the VQOM and the QCM, are trained and validated using one database and tested with a different one. The test results are compared with recent NR and FR metrics by means of correlation coefficients, obtaining favorable results for the proposed metrics.
MARINI, FABRIZIO. "Content based no-reference image quality metrics". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/29794.
Texto completoZabaleta, Razquin Itziar. "Image processing algorithms as artistic tools in digital cinema". Doctoral thesis, Universitat Pompeu Fabra, 2021. http://hdl.handle.net/10803/672840.
Texto completoLa industria del cine ha experimentado un cambio radical en las últimas décadas: la transición de su soporte fílmico a la tecnología del cine digital. Como consecuencia, han aparecido algunos desafíos técnicos, pero, al mismo tiempo, infinitas nuevas posibilidades se han abierto con la utilización de este nuevo medio. En esta tesis, se proponen diferentes herramientas que pueden ser útiles en el contexto del cine. Primero, se ha desarrollado una herramienta para aplicar \textit{color grading} de manera automática. Es un método basado en estadísticas de imágenes, que transfiere el estilo de una imagen de referencia a metraje sin procesar. Las ventajas del método son su sencillez y bajo coste computacional, que lo hacen adecuado para ser implementado a tiempo real, permitiendo que se pueda experimentar con diferentes estilos y 'looks', directamente on-set. En segundo lugar, se ha creado un método para mejorar imágenes mediante la adición de textura. En cine, el grano de película es la textura más utilizada, ya sea porque la grabación se hace directamente sobre película, o porque ha sido añadido a posteriori en contenido grabado en formato digital. En esta tesis se propone un método de 'ruido retiniano' inspirado en procesos del sistema visual, que produce resultados naturales y visualmente agradables. El modelo cuenta con parámetros que permiten variar ampliamente la apariencia de la textura, y por tanto puede ser utilizado como una herramienta artística para cinematografía. Además, debido al fenómeno de enmascaramiento del sistema visual, al añadir esta textura se produce una mejora en la calidad percibida de las imágenes, lo que supone ahorros en ancho de banda y tasa de bits. El método ha sido validado mediante experimentos psicofísicos en los cuales ha sido elegido por encima de otros métodos que emulan grano de película, métodos procedentes de academia como de industria. Finalmente, se describe una métrica de calidad de imágenes, basada en fenómenos fisiológicos, con aplicaciones tanto en el campo del procesamiento de imágenes, como más concretamente en el contexto del cine y la transmisión de imágenes: codificación de vídeo, compresión de imágenes, etc. Se propone la optimización de los parámetros del modelo, de manera que sea competitivo con otros métodos del estado del arte . Una ventaja de este método es su reducido número de parámetros comparado con algunos métodos basados en deep learning, que cuentan con un número varios órdenes de magnitud mayor.
Jung, Agata. "Comparison of Video Quality Assessment Methods". Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15062.
Texto completoAlkhattabi, Mona A. "Information quality assessment in e-learning systems". Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4867.
Texto completoAlrished, Mohamad Ayad A. "A quantitative analysis and assessment of the performance of image quality metrics". Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/128987.
Texto completoCataloged from student-submitted PDF of thesis.
Includes bibliographical references (pages 79-82).
Image quality assessment addresses the distortion levels and the perceptual quality of a restored or corrupted image. A plethora of metrics has been developed to that end. The usual mean of success of an image quality metric is their ability to agree with the opinions of human subjects, often represented by the mean opinion score. Despite the promising performance of some image quality metrics in predicting the mean opinion score, several problems are still unaddressed. This thesis focuses on analyzing and assessing the performance of image quality metrics. To that end, this work proposes an objective assessment criterion and considers three indicators related to the metrics: (i) robustness to local distortions; (ii) consistency in their values'; and (iii) sensitivity to distortion parameters. In addition, the implementation procedures of the proposed indicators is presented. The thesis then analyzes and assesses several image quality metrics using the developed indicators for images corrupted with Gaussian noise. This work uses both widely-used public image datasets and self-designed controlled cases to measure the performance of IQMs. The results indicate that some image quality metrics are prone to poor performance depending on the number of features. In addition, the work shows that the consistency in IQMs' values depends on the distortion level. Finally, the results highlight the sensitivity of different metrics to the Gaussian noise parameter. The objective methodology in this thesis unlocks additional insights regarding the performance of IQMs. In addition to the subjective assessment, studying the properties of IQMs outlined in the framework helps in finding a metric suitable for specific applications.
by Mohamad Ayad A. Alrished.
S.M.
S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering
Alkhattabi, Mona Awad. "Information quality assessment in e-learning systems". Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4867.
Texto completoSilva, Alexandre Fieno da. "No-reference video quality assessment model based on artifact metrics for digital transmission applications". reponame:Repositório Institucional da UnB, 2017. http://repositorio.unb.br/handle/10482/24733.
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Um dos principais fatores para a redução da qualidade do conteúdo visual, em sistemas de imagem digital, são a presença de degradações introduzidas durante as etapas de processamento de sinais. Contudo, medir a qualidade de um vídeo implica em comparar direta ou indiretamente um vídeo de teste com o seu vídeo de referência. Na maioria das aplicações, os seres humanos são o meio mais confiável de estimar a qualidade de um vídeo. Embora mais confiáveis, estes métodos consomem tempo e são difíceis de incorporar em um serviço de controle de qualidade automatizado. Como alternativa, as métricas objectivas, ou seja, algoritmos, são geralmente usadas para estimar a qualidade de um vídeo automaticamente. Para desenvolver uma métrica objetiva é importante entender como as características perceptuais de um conjunto de artefatos estão relacionadas com suas forças físicas e com o incômodo percebido. Então, nós estudamos as características de diferentes tipos de artefatos comumente encontrados em vídeos comprimidos (ou seja, blocado, borrado e perda-de-pacotes) por meio de experimentos psicofísicos para medir independentemente a força e o incômodo desses artefatos, quando sozinhos ou combinados no vídeo. Nós analisamos os dados obtidos desses experimentos e propomos vários modelos de qualidade baseados nas combinações das forças perceptuais de artefatos individuais e suas interações. Inspirados pelos resultados experimentos, nós propomos uma métrica sem-referência baseada em características extraídas dos vídeos (por exemplo, informações DCT, a média da diferença absoluta entre blocos de uma imagem, variação da intensidade entre pixels vizinhos e atenção visual). Um modelo de regressão não-linear baseado em vetores de suporte (Support Vector Regression) é usado para combinar todas as características e estimar a qualidade do vídeo. Nossa métrica teve um desempenho muito melhor que as métricas de artefatos testadas e para algumas métricas com-referência (full-reference).
The main causes for the reducing of visual quality in digital imaging systems are the unwanted presence of degradations introduced during processing and transmission steps. However, measuring the quality of a video implies in a direct or indirect comparison between test video and reference video. In most applications, psycho-physical experiments with human subjects are the most reliable means of determining the quality of a video. Although more reliable, these methods are time consuming and difficult to incorporate into an automated quality control service. As an alternative, objective metrics, i.e. algorithms, are generally used to estimate video quality quality automatically. To develop an objective metric, it is important understand how the perceptual characteristics of a set of artifacts are related to their physical strengths and to the perceived annoyance. Then, to study the characteristics of different types of artifacts commonly found in compressed videos (i.e. blockiness, blurriness, and packet-loss) we performed six psychophysical experiments to independently measure the strength and overall annoyance of these artifact signals when presented alone or in combination. We analyzed the data from these experiments and proposed several models for the overall annoyance based on combinations of the perceptual strengths of the individual artifact signals and their interactions. Inspired by experimental results, we proposed a no-reference video quality metric based in several features extracted from the videos (e.g. DCT information, cross-correlation of sub-sampled images, average absolute differences between block image pixels, intensity variation between neighbouring pixels, and visual attention). A non-linear regression model using a support vector (SVR) technique is used to combine all features to obtain an overall quality estimate. Our metric performed better than the tested artifact metrics and for some full-reference metrics.
Aniche, Mauricio Finavaro. "Context-based code quality assessment". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-13092016-123733/.
Texto completoDuas tarefas que desenvolvedores de software constantemente fazem são escrever código fácil de ser mantido e evoluído, e detectar pedaços de código problemáticos. Para a primeira tarefa, desenvolvedores comumente fazem uso de conhecidos padrões arquiteturais, como Model-View-Controller (MVC). Para a segunda tarefa, desenvolvedores fazem uso de métricas de código e estratégias de detecção de maus cheiros de código (code smells). No entanto, até o momento, métricas de código e estratégias de detecção de maus cheiros de código não levam em conta a arquitetura do software em análise. Isso significa que todas classes são avaliadas como se umas fossem iguais às outras. Na prática, sabemos que classes são diferentes em suas responsibilidades e implementação, e portanto, esperamos que elas variem em termos de acoplamento, coesão e complexidade. Por exemplo, em um sistema MVC, Controladores são responsáveis pelo fluxo entre a camada de Modelo e a camada de Visão, e Modelos representam a visão de negócios do sistema. Nesta tese, nós avaliamos o impacto dos papéis arquiteturais em técnicas de medição de métricas de código e de detecção de maus cheiros de código. Nós realizamos um estudo empírico em 120 sistemas de código aberto, e entrevistamos e realizamos questionários com mais de 50 desenvolvedores. Nossos resultados mostram que cada papel arquitetural possui distribuições diferentes de valores de métrica de código, consequência das diferentes responsabilidades de cada papel. Como consequência, propomos SATT, uma abordagem que provê thresholds específicos para papéis arquiteturais que são significantemente diferentes de outros em termos de métricas de código. Mostramos também que classes que cumprem um papel arquitetural específico também contêm maus cheiros de código específicos. Esses maus cheiros são percebidos por desenvolvedores como problemas reais e podem fazer com que essas classes sejam mais modificadas e apresentem mais defeitos do que classes limpas. Sugerimos então que desenvolvedores entendam a arquitetura dos seus sistemas, bem como as responsabilidades de cada papel arquitetural que as classes desempenham, para que tanto métricas de código quanto estratégias de detecção de maus cheiros de código possam prover um melhor retorno.
Bršel, Boris. "Porovnání objektivních a subjektivních metrik kvality videa pro Ultra HDTV videosekvence". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241052.
Texto completoGlazunov, Vladimir. "Quality assessment of a large real world industry project". Thesis, Linnéuniversitetet, Institutionen för datavetenskap (DV), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-31155.
Texto completoSchano, Gregory R. "Effect of Education on Adult Sepsis Quality Metrics In Critical Care Transport". Mount St. Joseph University Dept. of Nursing / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=msjdn155951570531873.
Texto completoOwens, Janna Yvonne Smithey. "Evalutation [i.e. Evaluation] of sediment-sensitive biological metrics as biomonitoring tools on varied spatial scales". Birmingham, Ala. : University of Alabama at Birmingham, 2006. http://www.mhsl.uab.edu/dt/2006p/owens.pdf.
Texto completoWu, Xinhao y Maike Zhang. "An empirical assessment of the predictive quality of internal product metrics to predict software maintainability in practice". Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-20149.
Texto completoZerman, Emin. "Evaluation et analyse de la qualité vidéo à haute gamme dynamique". Electronic Thesis or Diss., Paris, ENST, 2018. http://www.theses.fr/2018ENST0003.
Texto completoIn the last decade, high dynamic range (HDR) image and video technology gained a lot of attention, especially within the multimedia community. Recent technological advancements made the acquisition, compression, and reproduction of HDR content easier, and that led to the commercialization of HDR displays and popularization of HDR content. In this context, measuring the quality of HDR content plays a fundamental role in improving the content distribution chain as well as individual parts of it, such as compression and display. However, HDR visual quality assessment presents new challenges with respect to the standard dynamic range (SDR) case. The first challenge is the new conditions introduced by the reproduction of HDR content, e.g. the increase in brightness and contrast. Even though accurate reproduction is not necessary for most of the practical cases, accurate estimation of the emitted luminance is necessary for the objective HDR quality assessment metrics. In order to understand the effects of display rendering on the quality perception, an accurate HDR frame reproduction algorithm was developed, and a subjective experiment was conducted to analyze the impact of different display renderings on subjective and objective HDR quality evaluation. Additionally, in order to understand the impact of color with the increased brightness of the HDR displays, the effects of different color spaces on the HDR video compression performance were also analyzed in another subjective study. Another challenge is to estimate the quality of HDR content objectively, using computers and algorithms. In order to address this challenge, the thesis proceeds with the performance evaluation of full-reference (FR) HDR image quality metrics. HDR images have a larger brightness range and higher contrast values. Since most of the image quality metrics are developed for SDR images, they need to be adapted in order to estimate the quality of HDR images. Different adaptation methods were used for SDR metrics, and they were compared with the existing image quality metrics developed exclusively for HDR images. Moreover, we propose a new method for the evaluation of metric discriminability based ona novel classification approach. Motivated by the need to fuse several different quality databases, in the third part of the thesis, we compare subjective quality scores acquired by using different subjective test methodologies. Subjective quality assessment is regarded as the most effective and reliable way of obtaining “ground-truth” quality scores for the selected stimuli, and the obtained mean opinion scores (MOS) are the values to which generally objective metrics are trained to match. In fact, strong discrepancies can easily be notified across databases when different multimedia quality databases are considered. In order to understand the relationship between the quality values acquired using different methodologies, the relationship between MOS values and pairwise comparisons (PC) scaling results were compared. For this purpose, a series of experiments were conducted using double stimulus impairment scale (DSIS) and pairwise comparisons subjective methodologies. We propose to include cross-content comparisons in the PC experiments in order to improve scaling performance and reduce cross-content variance as well as confidence intervals. The scaled PC scores can also be used for subjective multimedia quality assessment scenarios other than HDR
Mehmood, Kashif. "Conception des Systèmes d'Information : une approche centrée sur les Patrons de Gestion de la Qualité". Phd thesis, Conservatoire national des arts et metiers - CNAM, 2010. http://tel.archives-ouvertes.fr/tel-00922995.
Texto completoChen, Dejiu. "Systems Modeling and Modularity Assessment for Embedded Computer Control Applications". Doctoral thesis, KTH, Maskinkonstruktion, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3792.
Texto completoQC 20100524
Earnest, Steven F. P. "Integrating GIS with Benthic Metrics: Calibrating a Biotic Index to Effectively Discriminate Stream Impacts in Urban Areas of the Blackland Prairie Eco-Region". Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4425/.
Texto completoDragana, Sandić-Stanković. "Мулти-резолуциона мера за објективну оцену квалитета синтетизованих слика ФТВ видео сигнала". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=101211&source=NDLTD&language=en.
Texto completoOsnovni doprinos ove doktorske disertacije je razvoj algoritama za objektivnu procenu vizuelnog kvaliteta slike sintetizovane primenom DIBR (Depth Image Based Rendering) tehnika koje uzrokuju neuniformna izobličenja u oblasti ivica. Primenom nelinearnih morfoloških filtara u multirezolucionoj dekompoziciji slika kod izračunavanja predložene metrike, važne geometrijske informacije kao što su ivice su dobro očuvane bez pomaka i zamućenja u slikama na različitim skalama multirezolucione reprezentacije. Izračunavanjem MSE po podopsezima koji sadrže ivice, piksel po piksel, precizno se meri razlika dve multirezolucione reprezentacije. Tako se najveći značaj u proceni kvaliteta dodeljuje oblasti ivica. Procene predložene metrike se dobro poklapaju sa subjektivnim ocenama.
The main contribution of this doctoral thesis is the development of algorithms for objectiveDIBR-synthesized view quality assessment. DIBR algorithms introduce nonuniformgeometric distortions affecting the edge coherency in the synthesized images.The non-linearmorphological filters used in multi-scale image decompositions of the proposed metricmaintain important geometric information such as edges across different resolutionlevels.Calculating MSE pixel-by-pixel through subbands in which the edges are extracted,the difference of the two multiresolution representations, the reference and the synthesizedimage, is precisely measured. In that way the importance of edge areas which are prone tosynthesis artifacts is emphasized in the image quality assessment. The proposed metric hasvery good agreement with human judgment.
Price, Kendall Susan. "Effects of Cattle Exclusion on Stream Habitat in the Shenandoah Valley, Virginia". Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/31952.
Texto completoMaster of Science
Everhart, Chichi Kate. "Strategies for Measuring Quality Care in Healthcare Organizations in the United States". ScholarWorks, 2018. http://scholarworks.waldenu.edu/dissertations/4851.
Texto completoSharif, Bonita. "Empirical Assessment of UML Class Diagram Layouts Based on Architectural Importance". Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1271679781.
Texto completoRodríguez, Demóstenes Zegarra. "Proposta da métrica eVSQM para avaliação de QoE no serviço de streaming de vídeo sobre TCP". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-16102014-165108/.
Texto completoNowadays, there are several multimedia services, which are carried via IP networks. From these all services; the traffic regarding video applications had the greatest growth in the last years. The success of video streaming applications is one of the major contributors to video traffic growth. Some recent studies project that video services, will reach approximately 55% of the total Internet traffic in 2016. Considering the relevance that video services will achieve in the coming years, this work focuses on the users Quality of Experience (QoE) when using these services. Thus, this thesis proposes an evaluation metric named enhanced Video streaming Quality Metric (eVsQM), which is based primarily on the number, duration and temporal location of the image freezes (pauses) during a video transmission. Also, this metric considers the video content type and was determined from a mathematical model that used as inputs, the video quality assessment results from subjective tests due, these types of test are the most correlated with real users QoE. It is worth noting that to perform these subjective tests was used a methodology consistent with the kind of video degradation (pause). For another hand, new video streaming solutions are created for the purpose of improving the users QoE of the user. Dynamic Adaptive Streaming over HTTP (DASH) changes the video resolution according to the network characteristics. However, if the network is very fluctuant, many video resolution switching events will be performed and users QoE will be degraded. This thesis proposes a parameter to be used in DASH algorithms that works as a threshold to control the resolution switching frequency. This parameter is named Switching Degradation Factor (SDF) and is responsible to maintain the QoE in acceptable levels, inclusive in scenarios in which the network capacity is very fluctuating.
Sanja, Maksimović-Moićević. "Predlog nove mere za ocenu kvaliteta slike prilikom interpolacije i njena implementacija u računarskoj obradi signal slike". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=95429&source=NDLTD&language=en.
Texto completoOsnovni doprinos ove doktorske disertacije je razvoj algortima i sistema za objektivnu procenu vizuelnog kvaliteta slike uzimajući u obzir najvažnija moguća oštećenja kao što su zamućenje ivica (oštrina) i poremećaj prirodnog izgleda teksture objekata na slici sa jedne strane i uticaj sadržaja slike (procenta ivica u slici) na procenu kvaliteta sa druge strane. Dakle, hipoteza izneta u ovom radu je da je potreban multiparametarski pristup da bi se dobila objektivna procena kvaliteta slike koja je što približnija subjektivnoj proceni.
Lautenschleger, Ary Henrique. "Análise da operação de sistemas de distribuição considerando as incertezas da carga e da geração distribuída". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/185256.
Texto completoThis work presents a probabilistic method for performance evaluation of distribution networks considering uncertainties in load demand and power generated by intermittent distributed systems. Consumers are divided into clusters by class and consumption range, so the modeling for the hourly demand of the consumers on each cluster is performed by a suitable cumulative probability distribution (CDF). Distributed generation is considered by means of solar photovoltaic sources. The Monte Carlo Simulation (MCS) Method is employed and the Joint Normal Transform technique is applied for correlated random numbers generation, used to sample consumer demand and the energy generated by distributed generation systems. The proposed method was applied in the well-known IEEE 13 node test feeder and the results of the operation losses as well as voltage violation indices obtained by the probabilistic model are compared to those obtained with the conventional deterministic model. It is shown that the mean is not always a sufficient description for the behavior of distribution network components and that it is more appropriate to use confidence intervals for the quantities of interest.
Santos, Izaias Souza dos. "Geoquímica e distribuição dos metais traço em testemunhos de sedimento do açude Marcela, Itabaiana - Sergipe". Universidade Federal de Sergipe, 2010. https://ri.ufs.br/handle/riufs/6127.
Texto completoThis study addresses the distribution of trace metals in sediment cores from the dam Marcela in order to evaluate the occurrence of impacts associated with human and industrial activity. The dam is located in the city Itabaiana in the state of Sergipe, it was built in the period 1953 - 1957 barring Fuzil stream. It has an area of 1.4 km2 with storage capacity of 2,700,000 m3. Two sediment cores were collected in November of 2008 with approximately 45cm in two distinct points. The samples were sectioned in 5 cm each and they were analyzed by to determine the following chemical elements: Co, Cr, Cu, Ni, Pb, Zn, Mn, Al, Fe, Corg and Ntotal. The average value of Corg/Ntotal in the range 4,97- 7,64 and 6,39-7,69, for cores I and II respectively, indicative autochthonous and allochthonous origin of the organic matter. The multivariate statistical analysis (Principal component analysis) applied to the set of results showed that the two cores in relation to concentrations of metals are different, with evidence of enrichment for Cr, Cu, Mn and Zn in the surface layers. The contamination factor calculed showed contamination moderate level for metals Cr, Cu, Mn and Zn. The risk assessment code (RAC), which consider the percentage of metal extracted in the label fraction (F1) of BCR procedure, showed that chromium does not present risk to the environment, copper, nickel and lead were low to medium risk, and zinc had of very high to High risk to the aquatic environment. Small variations in environmental conditions, such as pH or salinity, could therefore increase availability of the elements to the aquatic system. The metals concentrations were always at the lower limit the TEC and PEC, defined by consensual sediment quality guidelines (SQGs), in this case, it is not possible to predict what adverse effects the metal can cause in this environment.
Neste trabalho foi determinada a distribuição de metais traço em testemunhos de sedimento do Açude Marcela com o objetivo de avaliar a ocorrência de impactos associados à atividade humana e industrial, desenvolvidas naquela região. O Açude Marcela localiza-se na cidade de Itabaiana Sergipe, foi construído no período 1953 à 1957 pelo barramento do riacho Fuzil e tem uma área de 1,4km2 , com capacidade de armazenamento de 2.700.000 m3. Foram coletados em novembro de 2008 dois testemunhos de sedimentos com aproximadamente 45cm de profundidade em dois pontos distintos do açude. Os testemunhos foram secionados a cada 5cm para determinação dos seguintes elementos químicos: Co, Cr, Cu, Ni, Pb, Zn, Mn, Al, Fe, Corg e Ntotal. A relação Corg/Ntotal variou de 4,97-7,64 e 6,39-7,69 para os testemunhos I e II, respectivamente, indicando origem autóctone e alóctone para a matéria orgânica presente no sedimento. A análise estatística multivariada (análise de componentes principais-ACP), aplicada ao conjunto dos resultados, mostrou que os dois testemunhos, em relação às concentrações dos metais, são estatisticamente diferentes, com evidências de enriquecimento por Cr, Cu, Mn e Zn, nas camadas mais superficiais. O fator de contaminação calculado mostrou um nível de contaminação moderado para os metais Cr, Cu, Mn e Zn. O Fator de Risco (RAC), que compreende a percentagem do metal extraída na fração lábil (F1) do procedimento (BCR) empregado, indicou que o cromo não apresentou risco ao ambiente. Cobre, níquel e chumbo apresentaram risco baixo a médio, e zinco apresentou risco alto a altíssimo para o ambiente aquático. Sendo assim, pequenas variações nas condições ambientais podem remobilizar esses elementos do sedimento para a coluna d água. As concentrações dos metais nos testemunhos estiveram entre TEC e o PEC, definidos pelos valores guias de qualidade de sedimento consensual (VGQS), indicando que, nas condições atuais, o sedimento pode exercer efeito adverso aos organismos do açude em questão.
Maciel, Maria Goretti de Lacerda. "O Qualis periódicos na percepção dos programas de pós-graduação". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/90076.
Texto completoThe evaluation of quality of publications resulting from graduate programs through the Capes Qualis system, in particular those journal articles has been criticized both positive and negative, making room for a review and improvement, The results of searches on different bases of scientific information showed that the theme of Qualis system of Capes has attracted the attention of the academy of country and that there are no consensus with respect to the ranking methodology nor concerning the weights given to evaluation of graduate programs. Also the system lacks a critical review from the point of view of coordinators of graduate programs, o7bject of this dissertation. This survey was developed by electronic consultation to graduate coordinators, organized by area of expertise. It has been searches by major field research for identifying procedures and criteria adopted by the committees of areas. The Brazilian graduate programs, recommended by Capes are seeking a higher quality in their master's and doctoral courses, which necessarily implies broaden their scientific communications forms. To some researchers the system is an indirect rating, since does not evaluate the qualities of surveys or articles produced.
Santos-Araujo, Sabrina Novaes dos. "Soil-to-plant transfer of heavy metals and an assessment of human health risks in vegetable-producing areas of São Paulo state". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-30042015-152533/.
Texto completoUma das principais vias de exposição de elementos potencialmente tóxicos (EPT) para a maioria da população é por meio da ingestão de alimentos, mas poucos são os estudos relacionados às concentrações de EPTs em solos e em vegetais de regiões tropicais úmidas, sobretudo no Brasil. O índice mais comumente utilizado para estimar o acúmulo de EPTs em vegetais e a subsequente exposição humana pelo consumo de vegetais é o fator de bioconcentração (BCF), que é a razão entre a concentração de metais em partes comestíveis de hortaliças e da concentração total do metal no solo. Porém, o BCF não descreve adequadamente a transferência solo-planta de metais. Assim, a utilização de relações envolvendo os principais atributos dos solos que influenciam a disponibilidade dos EPTs às plantas pode explicar com mais detalhe as relações solo-planta. O estado de São Paulo é o maior mercado consumidor, além de ser o maior e mais diversificado produtor olerícola no Brasil. Assim, são necessárias pesquisas referentes às concentrações de metais pesados em solos e hortaliças, para avaliação da qualidade dos mesmos em relação aos limites estabelecidos pela legislação. Os objetivos neste trabalho foram: (i) caracterizar e avaliar as relações solo-planta entre as concentrações de Cd, Cu, Ni, Pb e Zn em solos e olerícolas de folhas e raiz no estado de São Paulo, tendo em vista os limites estabelecidos pela legislação; (ii) desenvolver modelos empíricos para poder derivar adequados limites críticos do solo e fornecer uma avaliação de risco precisa para regiões tropicais; (iii) desenvolver propostas para melhorar os limites críticos baseados na saúde humana para Cd, Cu, Ni, Pb e Zn em solos de São Paulo, utilizando relações solo-planta adequadas para as condições tropicais. Com exceção do Cd, houve correlação positiva entre os teores pseudototais e biodisponíveis dos EPTs. Os teores de Cd e de Pb nas plantas, por outro lado, não correlacionaram significativamente com nenhuma das variáveis estudadas. Os modelos de florestas aleatórias e árvores foram bons preditores de resultados gerados a partir de um modelo de regressão e forneceram informações úteis sobre quais covariáveis foram importantes para previsão apenas para o teor de Zn na planta. A aplicação de modelos de transferência solo-planta proposto neste estudo tiveram bom desempenho e foram úteis para oito das dez combinações (cinco metais contra duas espécies). O conjunto de resultados de SP pode ser combinado com o da Holanda usando o modelo em que se incluem pH, teor de carbono orgânico - CO e teor de argila para Cd em alface e para Ni e Zn na alface e na cenoura. O modelo foi mais eficiente com os conjunto de resultados combinados para Cu, Pb, Zn, em alface e para Cd e Cu na cenoura. A abordagem não foi eficiente para Ni e para Pb em cenoura, com resultados incoerentes para os conjuntos de resultados combindados ou separados, para os quatro modelos testados.
Preiss, Jens. "Color-Image Quality Assessment: From Metric to Application". Phd thesis, 2015. https://tuprints.ulb.tu-darmstadt.de/4389/1/Preiss_PhD-Thesis.pdf.
Texto completoShen, Kuan-Hung y 沈冠宏. "Machine learning based no-reference assessment metric for stereoscopic image quality of experience". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/25281189021731135195.
Texto completo國立中興大學
電機工程學系所
105
Perceptual quality plays an irreplaceable importance in viewing stereoscopic 3d images. Generally, worse quality stereoscopic 3D images will cause the viewer’s eyes tolerate fatigue, painfulness or feel dizziness, headache. Therefore, in this study, we propose a no-reference metric for stereoscopic image quality of experience (QoE) to evaluate the visual discomfort when the viewers view stereoscopic images. We develop two regression models in machine learning (ML), support vector machine (SVM) and random forest (RF), to assess the scores of visual discomfort and then compare the performance between two models. We test our method on the publicly available EPFL 3D image database and IEEE-SA stereoscopic image databases. First, the disparity of stereoscopic pairs is calculated and the depth information, called the depth-disparity map, is obtained from the resulting disparity map through Otsu’s algorithm. Next, four kinds of features are extracted based on the pixel values and distribution of depth-disparity map to build the input data and then use above-mentioned two regression models to analyze the data. Finally, the correlation between the predicted scores obtained from the proposed metric and the subjective scores provided by the databases is calculated. The experimental results show that the proposed metric achieves an impressive performance comparing with current state-of-the-art methods.
Larson, Eric C. "The strategy of image quality assessment a new fidelity metric based upon distortion contrast decoupling /". 2008. http://digital.library.okstate.edu/etd/umi-okstate-2840.pdf.
Texto completo"Perceptual-Based Locally Adaptive Noise and Blur Detection". Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.38426.
Texto completoDissertation/Thesis
Doctoral Dissertation Electrical Engineering 2016
Yaghmaei, Ayoub. "Documents Usability Estimation". Thesis, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-79133.
Texto completoChen, Zhisong. "Formal metrics for quantitative assessment of the quality of expert systems". Thesis, 1994. http://spectrum.library.concordia.ca/3298/1/NN97686.pdf.
Texto completoJalbani, Akhtar Ali. "Quality Assessment and Quality Improvement for UML Models". Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B6AA-7.
Texto completoPipa, Ana Margarida Conceição. "Owl ontology quality assessment and optimization in the cybersecurity domain". Master's thesis, 2018. http://hdl.handle.net/10071/18743.
Texto completoO objetivo desta dissertação foi avaliar a qualidade das ontologias, em padrões percebidos pelo contexto de cibersegurança. Uma análise de conteúdo entre ontologias indicou que havia diferenças mais pronunciadas por ontologias OWL no campo da cibersegurança. Os resultados mostram um aumento da relevância de expressividade para a variabilidade. Além disso, não foram encontradas diferenças em estratégias utilizadas na maioria dos incidentes. O conhecimento das ontologias precisa de ser enfatizado para se entender os fenómenos de qualidade. Além disso, as ontologias são um meio de representar uma área de conhecimento através da sua estrutura semântica e facilita a pesquisa de informações e a integração de dados de diferentes origens, pois fornecem uma base comum que garante a coerência dos dados, categorizados e descritos, de forma normativa. A unificação da informação com o mundo que nos rodeia permite criar sinergias entre entidades e relacionamentos. No entanto, a área de cibersegurança é um dos domínios do mundo real em que o conhecimento é incerto e é fundamental analisar os desafios de escolher a representação apropriada de informações não estruturadas. As vulnerabilidades são identificadas, mas a resposta a incidentes não é um mecanismo automático para se entender e processar textos não estruturados encontrados na web.
Brunet, Dominique. "A Study of the Structural Similarity Image Quality Measure with Applications to Image Processing". Thesis, 2012. http://hdl.handle.net/10012/6982.
Texto completoLee, Yuan-Yu y 李元喻. "Assessment of Landuse Change and Associated Impacts on Water Quality and Ecology by Employing Landscape Metrics -Case Study in Taipei Water Source Special District". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/tw68m8.
Texto completo國立臺北科技大學
土木與防災研究所
101
The change of hydrological environment in a watershed due to land use variation is usually slow and imperceptible. Since there are complicated relationships among water quality, water resource and ecosystem, the change of geographical environment will result in a variation of ecological environment and impacts of water quality. The rivers and the Feitsui reservoir at the Taipei water source district is an important source of water supply in Taipei Area. The control and management of water quality is a primary concern in this area. Therefore, it is an urgent need to establish the knowledge in land uses, water quality and ecology in the watershed. The objective of the study is to use the landscape ecological metrics to assess land use change and associated impacts on water quality and ecology. The SPOT satellite images of 1995 and 2012 were implemented classification, change detection, and the landscape ecology metrics calculation at eight sampling sites in the district. The results showed that the agricultural area has expanded and partially replaced the area of forest and road at the Pinglin, Hu Liao Tan of Peishih River and Cukeng Dam of Nanshih River. The change was less in Bihu and in the upstream of Tungho River. It can also conclude from the study that when it tends to the downstream location in the special district, the cluster of construction zone, the contiguity of agricultural zone, the meander of road zone and the polymerization of water zone increase, but the fractional of forest zone decrease. This study performed the correlation analysis for landscape metrics of each area and ecological indices of water quality. The result showed that it could bring out negative influences when large area and long length of edge of construction zone and road exist, which is the results of human activities. The trend was getting worse in agricultural blocks when the quantity of patches increased, the density elevated and there were situation such as perforation and fragmentation. There were positive effects in blocks of grass and forest if they were in large area of blocks and adjacent to each other, because they functioned like the buffer strips. It can see from the study that it is capable of evaluating the landscape distribution and the change of water quality in this area by comparing the spatial and temporal variation of landscape metrics.