Tesis sobre el tema "No Reference Quality Assessment"
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Cheng, Wu. "Corrupted Image Quality Assessment". University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1335969249.
Texto completoBurkhart, Joshua. "A Method for Reference-Free Genome Assembly Quality Assessment". Thesis, University of Oregon, 2013. http://hdl.handle.net/1794/13338.
Texto completoZhu, Kongfeng [Verfasser]. "No-reference Video Quality Assessment and Applications / Kongfeng Zhu". Konstanz : Bibliothek der Universität Konstanz, 2014. http://d-nb.info/1058326015/34.
Texto completoZhang, Chen. "Blind Full Reference Quality Assessment of Poisson Image Denoising". University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398875743.
Texto completoAlaql, Omar abdulrahman. "GENERAL PURPOSE APPROACHES FOR NO-REFERENCE IMAGE QUALITY ASSESSMENT". Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1495821893652963.
Texto completoCORCHS, SILVIA ELENA. "Image quality assessment for Digital documents". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/50461.
Texto completoShahid, Muhammad. "Methods for Objective and Subjective Video Quality Assessment and for Speech Enhancement". Doctoral thesis, Blekinge Tekniska Högskola [bth.se], Faculty of Engineering - Department of Applied Signal Processing, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00603.
Texto completoMARINI, FABRIZIO. "Content based no-reference image quality metrics". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/29794.
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 completoAnsari, Yousuf Hameed y Sohaib Ahmed Siddiqui. "Quality Assessment for HEVC Encoded Videos: Study of Transmission and Encoding Errors". Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13656.
Texto completoAldradi, Ibtesam. "Quality assessment of English language programmes in Libyan universities : with reference to Tripoli University". Thesis, Liverpool John Moores University, 2015. http://researchonline.ljmu.ac.uk/4364/.
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.
R, 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 completoMcNeil, Vivienne Heather. "Assessment methodologies for very large, irregularly collected water quality data sets with special reference to the natural waters of Queensland". Thesis, Queensland University of Technology, 2001.
Buscar texto completoOuni, Sonia. "Evaluation de la qualité des images couleur. Application à la recherche & à l'amélioration des images". Thesis, Reims, 2012. http://www.theses.fr/2012REIMS034.
Texto completoThe research area in the objective quality assessment of the color images has been a renewed interest in recent years. The work is primarily driven by the advent of digital pictures and additional needs in image coding (compression, transmission, recovery, indexing,...). So far the best evaluation is visual (hence subjective) or by psychophysical techniques or by expert evaluation. Therefore, it is useful, even necessary, to establish criteria and objectives that automatically measures quality scores closest possible quality scores given by the subjective evaluation. We propose, firstly, a new full reference metric to assess the quality of color images, called overall Delta E, based on color appearance and incorporates the features of the human visual system (HVS). Performance was measured in two areas of application compression and restoration. The experiments carried out show a significant correlation between the results and subjective assessment.Then, we propose a new no reference quality assessmenent color images approach based on neural networks: given the multidimensional nature of image quality, a quantification of quality has been proposed, based on a set of attributes forming the descriptor UN (Utility, Naturalness). Accuracy reflects the sharpness and clarity. As for naturality, it reflects the brightness and color. To model the criterion of color, three no reference metrics were defined to detect the dominant color in the image, the proportion of that color and its spatial dispersion. This approach is based on neural networks to mimic the HVS perception. Two variants of this approach have been tried (direct and progressive). The results showed the performance of the progressive variant compared to the direct variant. The application of the proposed approach in two areas: in the context of restoration, this approach has served as a stopping criterion for automatic restoration algorithms. In addition, we have used in a system for estimating the quality of images to automatically detect the type of content in an image degradation. In the context of indexing and image retrieval, the proposed approach was used to introduce the quality of images in the database as an index. The experimental results showed the improvement of system performance image search by content by using the index or by making a quality refinement results with the quality criterion
Hallap, Triin. "Assessment of sperm attributes of frozen-thawed AI doses from Swedish and Estonian dairy bull sires : with special reference to pre-selection through swim-up, and the influence of age on potential fertility /". Uppsala : Dept. of Clinical Sciences, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/2005113.pdf.
Texto completoBoujut, Hugo. "Mesure sans référence de la qualité des vidéos haute définition diffusées avec des pertes de transmission". Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14578/document.
Texto completoThe goal of this Ph.D thesis is to design a no-reference video quality assessment method for lossy net-works. This Ph.D thesis is conducted in collaboration with the Audemat Worldcast Systemscompany.Our first no-reference video quality assessment indicator is the frozen frame detection.Frozen frame detection was a research topic which was well studied in the past decades.However, the challenge is to embed a frozen frame detection method in the GoldenEagleAudemat equipment. This equipment has low computation resources that not allow real-time HD video decoding. Two methods are proposed: one based on the compressed videostream motion vectors (MV-method) and another one based on the DC coefficients from thedct transform (DC-method). Both methods only require the partial decoding of the com-pressed video stream which allows for real-time analysis on the GoldenEagle equipment.The evaluation shows that results are better than the frame difference base-line method.Nevertheless, the MV and the DC methods are only suitable with for MPEG2 and H.264video streams. So a third method based on SURF points is proposed.As a second step on the way to a no-reference video quality assessment metric, we areinterested in the visual perception of transmission impairments. We propose a full-referencemetric based on saliency maps. This metric, Weighted Mean Squared Error (WMSE), is theMSE metric weighted by the saliency map. The saliency map role is to distinguish betweennoticeable and unnoticeable transmission impairments. Therefore this spatio-temporal saliencymaps is computed on the impaired frame. Thus the pixel difference in the MSE computationis emphasized or diminished with regard to the pixel saliency. According to the state of theart, several improvements are brought to the saliency map computation process. Especially,new spatio-temporal saliency map fusion strategies are designed.After our successful attempt to assess the video quality with saliency maps, we develop ano-reference quality metric. This metric, Weighted Macro-Block Error Rate (WMBER), relies on the saliency map and the macro-block error detection. The macro-block error detectionprovides the impaired macro-blocks location in the frame. However, the impaired macro-blocks are concealed with more or less success during the decoding process. So the saliencymap provides the user perceived impairment strength for each macro-block.Several psycho-visual studies have shown that semantics play an important role in visualscene perception. These studies conclude that faces and text are the most attractive. Toimprove the spatio-temporal saliency model a semantic dimension is added. This semanticsaliency is based on the Viola & Jones face detector.To predict the Mean Opinion Score (MOS) from objective metric values like WMBER,WMSE, PSNR or SSIM, we propose to use a supervised learning approach. This approach iscalled Similarity Weighted Average (SWA). Several improvements are brought to the originalSWA.For the metrics evaluation a psycho-visual experiment with 50 subjects has been carriedout. To measure the saliency map models accuracy, a psycho-visual experiment with aneye-tracker has also been carried out. These two experiments habe been conducted in col-laboration with the Ben Gurion University, Israel. WMBER and WMSE performances arecompared with reference metrics like SSIM and PSNR. The proposed metrics are also testedon a database provided by IRCCyN research laboratory
Elias, Carmen Lopes. "Effect of global changes and spatial scale on diatom communities of temperate rivers: dealing with implications in bioassessment". Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/22393.
Texto completoDiatoms are generally the most frequent and abundant algae in streams and are known by their responsiveness to changes in the environmental conditions of streams. Diatoms are frequently the only biological quality element representative of the aquatic flora in small streams. As a result, diatoms are nowadays a mandatory biological element in the evaluation of the ecological quality of European rivers, according to the Water Framework Directive. Nevertheless, there is still a relative lack of knowledge of key effects of global changes and spatial scale on diatoms. To bridge this gap, this work aims to study the effect of relevant global changes as well as spatial scale on diatom communities of temperate rivers and to deal with its implications in bioassessment. The relevant global changes were assessed in streams from the central Portuguese littoral region which is highly populated and suffers from high anthropogenic impacts. The effect of spatial scale on diatom communities was investigated by a laboratorial experiment (mesocosm experiment) and by using diatom data from temperate regions of the United States of America and Australia. In order to achieve the main aim, three global questions were raised: (1) How to deal with the historical anthropogenic influences in the bioassessment?; (2) Are extreme events due to climatic changes reflected in diatom communities? A comparison with macroinvertebrate communities; (3) How are diatom communities influenced at the spatial scale (small-scale: habitats; large-scale: inter-continental). A strong anthropogenic influence on the streams and rivers of the Portuguese littoral region was confirmed as well as the lack of true reference sites. Sites in the Least Disturbed Condition (LDC) had considerable high nutrient concentrations. As the strong anthropogenic pressures (e.g., alteration of the riparian vegetation, morphological condition and sediment load) prevented an adequate definition of reference conditions for streams in this area an alternative procedure to define suitable reference conditions was investigated, consisting of a combination of modelling and filter approach. This procedure is suitable to deal with the implications of global changes on diatom and on macroinvertebrate communities. The communities observed in the different streams were less homogeneous than those predicted for the same streams under reference conditions (i.e., through the filter approach), as would be expected in sites having variable levels of anthropogenic change. Along with the development of this new approach a new multimetric diatom index was developed. This index produced strong correlations with the selected pressures, providing a more comprehensive assessment of biological quality than the Indice de Polluosensibilité Spécifique (IPS) officially adopted for Portugal. To answer the second global question a smaller set of streams were used within the Portuguese littoral region that were affected by an unusual drought event that lead to the complete drying of the stream channels. Diatoms, as well as macroinvertebrates, were affected by the drought event considering trait proportions, community’s composition and bioassessment classifications. However, the diatom communities had a faster recovery response than macroinvertebrates. The type of substrate – hard and soft –representing the small spatial scale affected diatom communities by changing its composition and trait proportions but not water quality classification in a mesocosm experiment. However, the differences found in the epipsammic and epilithic diatom communities in the streams that were used to answer the first global question were more evident than those found in the mesocosm experiment. In fact, with the mesocosm results, and under the same physical and chemical conditions the IPS differences between substrates disappeared contrasting with the differences that were found in the streams. Additionally, the diatom communities were different between continents with the same type of climate, suggesting that diatom communities are also influenced at the large-scale (even at the order level). Therefore, constraints other than climate are likely to have contributed to the inter-continental differences in diatom community composition found at all taxonomical levels (e.g., geology, historical biogeographic processes and hydrology). On the whole, the results obtained during this study bring new information and new approaches to deal with the bioassessment. However, some more work must be done in order to investigate e.g., based in the global warming predictions, the effects of the temperature increase, on the water quality assessment based on diatom communities.
As diatomáceas são as algas que se encontram mais frequentemente e em maior abundância em cursos de água doce. São conhecidas pela capacidade dos diferentes taxa responderem a variações das condições ambientais dos rios e por serem frequentemente o único elemento de qualidade biológica representativo da flora aquática em pequenos rios e ribeiras. Em consequência destas características, e de acordo com a Directiva Quadro da Água, as diatomáceas são presentemente um dos elementos biológicos obrigatórios na avaliação da qualidade ecológica dos rios europeus. No entanto, ainda existe algum desconhecimento acerca dos efeitos das alterações globais e da escala espacial nas diatomáceas. Para colmatar esta lacuna, o presente trabalho tem como objetivo estudar o efeito de alterações globais relevantes e da escala espacial nas comunidades de diatomáceas de rios temperados assim como estudar a melhor forma de lidar com as suas implicações na biomonitorização. O efeito das alterações globais foi estudado em rios e ribeiras da região centro litoral de Portugal continental dado tratar-se de uma região densamente povoada e sujeita a impactos antropogénicos significativos. O efeito da escala espacial nas comunidades de diatomáceas foi investigado através de uma experiência laboratorial (mesocosmos) e também com recurso a informação estatística de comunidades de diatomáceas de várias regiões temperadas, incluindo as costas ocidentais dos Estados Unidos da América e da Austrália. De modo atingir o objetivo principal deste trabalho, três questões globais foram colocadas: (1) Como lidar com as influências antrópicas históricas na biomonitorização?; (2) Será que as comunidades de diatomáceas reflectem os eventos extremos causados pelas alterações climáticas? Uma comparação com as comunidades de macroinvertebrados; (3) Como são as comunidades de diatomáceas influenciadas pela escala espacial (pequena escala: habitats; grande escala: inter-continental). Verificou-se uma influência antropogénica considerável nos rios e ribeiras da região centro litoral de Portugal continental assim como a inexistência de verdadeiros locais de referência. Mesmo os locais considerados como estando em condições de menor perturbação apresentaram concentrações de nutrientes consideravelmente elevadas na água. Uma vez que as fortes pressões antropogénica (p.e., alteração da vegetação ripária, condição morfológica e carga de sedimentos) não permitiram o estabelecimento de condições de referência adequadas para os rios desta região, foi proposto um procedimento alternativo baseado numa combinação de dois métodos – modelação e filtros ambientais. A aplicação deste procedimento na definição de condições de referência revelou-se útil para lidar com os efeitos das alterações globais na biomonitorização com recurso a comunidades de diatomáceas e macroinvertebrados. De facto, como seria de esperar, as comunidades observadas em rios sujeitos a alterações antropogénicas revelaram-se menos homogéneas do que as previstas em condições de referência para esses mesmos rios, i.e., através da aplicação dos referidos filtros ambientais. Em conjunto com o desenvolvimento deste novo procedimento, foi também proposto um novo índice multimétrico de diatomáceas. Este novo índice revelou-se fortemente correlacionado com as pressões selecionadas, fornecendo uma avaliação da qualidade biológica mais abrangente do que o índice oficial adotado por Portugal, o Indice de Polluosensibilité spécifique (IPS). Para responder à segunda questão global apenas um subconjunto de ribeiras da região litoral de Portugal foi selecionado, o qual engloba as ribeiras cujos leitos secaram durante uma vaga de calor invulgar que ocorreu em Portugal em 2011/2012. Verificou-se que, de facto, quer as comunidades de diatomáceas quer de macroinvertebrados foram afetadas pelo evento de seca extrema tendo-se observado alterações ao nível das proporções de traits, composição e a classificação da qualidade biológica. No entanto, as diatomáceas apresentaram uma recuperação significativamente mais rápida que os macroinvertebrados. Os tipos de substratos usados na experiência de mesocosmos realizada neste trabalho (duro vs. macio; pequena escala espacial) também mostraram afetar as comunidades de diatomáceas, uma vez que houve diferenças quer na sua composição quer nas proporções de traits. Esta resposta ao tipo de substrato foi mais evidente em condições físico-químicas controladas do que aquela sugerida pelas diferenças entre as comunidades epipsâmicas e epilíticas dos rios monitorizados neste trabalho. Não obstante, durante a experiência de mesocosmos verificou-se que ao nível de IPS as diferenças entre substratos não eram relevantes quando comparadas com as que se haviam verificado nos rios. As diferenças observadas entre as comunidades de diatomáceas dos vários continentes (Europa, América e Austrália) sugerem que variações ao nível da grande escala também ocasionam diferenças nas comunidades, apesar de influenciados pelo mesmo tipo de clima. Isto sugere que outros factores para além do clima (p.e., geologia, processos biogeográficos históricos e hidrologia) podem ter contribuído para as diferenças inter-continentais verificadas ao nível da composição das comunidades de diatomáceas, a todos os níveis taxonómicos estudados. De um modo geral, os resultados obtidos durante este estudo trazem novas informações e novas abordagens para lidar com a biomonitorização. No entanto, mais trabalho será necessário a fim de investigar, por exemplo, os efeitos do aumento da temperatura previstos devido ao aquecimento global na avaliação da qualidade da água com base em comunidades de diatomáceas.
Tawbi, Hassan, of Western Sydney Macarthur University y Faculty of Education. "Translation quality assessment". THESIS_FE_XXX_Tawbi_H.xml, 1994. http://heston.uws.edu.au:8081/1959.7/57.
Texto completoMaster of Arts (Hons)
Середюк, Д. О. "Удосконалення методів та пристроїв забезпечення оцінювання відповідності засобів для обліку природного газу". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2012. http://elar.nung.edu.ua/handle/123456789/1798.
Texto completoDissertation for the degree of candidate of technical sciences, specialty 05.01.02 -standardization, and certification. - Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivs’k, 2012. The thesis is devoted to solving scientific and applied tasks to ensure traceability volume and volumetric flow of natural gas through improved methods and devices to ensure conformity assessment metrological characteristics of accounting for natural gas. Theoretical study of physical processes in the bell of standard installations. Analytical modeling of hydrodynamic processes in the frontal resistance when approaching the bottom of the bell ring tank with rotating stabilizing ring. Modeled impact angle bell reference installation on its accuracy. Methodology correlation analysis of signals informative parameters for evaluating the stability of playing costs bell installations. The developed method for determining the weight coefficients for evaluating complex quality gas meters. Theory and measurement improved transmission unit volumetric flow of gas from the state primary standard to standards-based critical nozzles. Proved and the first time a practical testing procedures of international comparisons of national measurement standards unit volume and volumetric flow of gas with state primary standard of Ukraine with special reference of tire transmission unit. Developed and introduced into practice regulations that provide conformity assessment of accounting for natural gas.
Banitalebi, Dehkordi Amin. "3D video quality assessment". Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54581.
Texto completoApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Šmida, Vladimír. "Fingerprint Image Quality Assessment". Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2011. http://www.nusl.cz/ntk/nusl-237090.
Texto completoYao, Zhigang. "Digital Fingerprint Quality Assessment". Caen, 2015. http://www.theses.fr/2015CAEN2030.
Texto completoDigital fingerprint is one of the most reliable modality in modern biometrics and hence has been widely studied and deployed in real applications. The accuracy of one Automatic Fingerprint Identification System (AFIS) largely depends on the quality of fingerprint samples, as it has an important impact on the degradation of the matching (comparison) error rates. This thesis mainly focuses on the valuation of biometric quality metrics and fingerprint quality assessment (FQA), particularly in estimating the quality of gray-level fingerprint images or represented by a minutiae set. By making a refined review of both biometric systems and relevant evaluation techniques, this thesis firstly contributes by the definition of a new evaluation/validation framework for estimating the performance of biometric quality metrics. The evaluation/validation framework is defined in the enrollment phase by using onine trials. The validity of a biometric quality metric can be statistically measured by the degradation of the global Equal Error Rates (EER) and the associated Condence Intervals (CIs). Next, this thesis makes effort mainly in assessing fingerprint image quality in several different ways which include three parts in the context of the FQA, where each of them is proposed in terms of a systematic literature review of the existing studies of this issue. First, a quality assessment approach based on multiple features and a prior-knowledge of matching performance is proposed in this thesis, which achieves qualifying fingerprint image with fusion and learning schemes and observes some potential problems of this kind of solution. Second, a new FQA algorithm using the Delaunay triangulation is proposed to estimate the quality of a digital fingerprint via only its minutiae template. This approach demonstrates the possibility for estimating the quality of digital fingerprint with the minutiae template alone. Third, another FQA framework is carried out via multi-segmentation approach of fingerprint image, which gives a new solution of this problem. Meanwhile, all the proposed FQA approaches in this thesis provide a comparative study of this issue, for the proposed FQA algorithms are able to represent each representative solution among the existing studies
Al-Jawad, D. S. "Some aspects of quality assurance, with particular reference to quality auditing". Thesis, University of Essex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376721.
Texto completoPrytz, Anders. "Video Quality Assessment in Broadcasting". Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10870.
Texto completoIn broadcasting, the assessment of video quality is mostly done by a group of highly experienced people. This is a time consuming task and demands lot of resources. In this thesis the goal is to investigate the possibility to assess perceived video quality with the use of objective quality assessment methods. The work is done in collaboration with Telenor Satellite Broadcasting AS, to improve their quality verification process from a broadcasting perspective. The material used is from the SVT Fairytale tape and a tape from the Norwegian cup final in football 2009. All material is in the native resolution of 1080i and is encoded in the H.264/AVC format. All chosen compression settings are more or less used in daily broadcasting. A subjective video quality assessment been carried out to create a comparison basis of perceived quality. The subjective assessment sessions carried out by following ITU recommendations. Telenor SBc provided a video quality analysing system, the Video Clarity Clearview system that contains the objective PSNR, DMOS and JND. DMOS and JND are two pseudo-subjective assessment methods that use objective methods mapped to subjective results. The methods hopefully predict the perceived quality and eases quality assessment in broadcasting. The correlation between the subjective and objective results is tested with linear, exponential and polynomial fitting functions. The correlation for the different methods did not achieve a result that proved use of objective methods to assess perceived quality, independent of content. The best correlation result is 0.75 for the objective DMOS method. The analysis shows that there are possible dependencies in the relationship between subjective and objective results. By measuring spatial and temporal information possible dependent correlation results are investigated. The results for dependent relationships between subjective and objective results are good. There are some indications that the two pseudo-subjective methods, JND and DMOS, can be used to assess perceived video quality. This applies when the mapping functions are dependent on spatial and temporal information of the reference sequences. The correlation achieved for dependent fitting functions, that has a suitable progression, are in the range 0.9 -- 0.98. In the subjective tests, the subjects used were non-experts in quality evaluation. Some of the results indicate that subjects might have a problem with assessing sequences with high spatial information. This thesis creates a basis for further research on the use of objective methods to assess the perceived quality.
Dhakal, Prabesh, Prabhat Tiwari y Pawan Chan. "Perceptual Video Quality Assessment Tool". Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2576.
Texto completoIn our research work, we have designed the tool that can be used to conduct a mass-scale level survey or subjective tests. ACR is the only method used to carry out the subjective video assessment. The test is very useful in the context of a video streaming quality. The survey can be used in various countries and sectors with low internet speeds to determine the kind of video or the compression technique, bit rate, or format that gives the best quality.
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Ray, Arjun. "Quality assessment of protein models". Licentiate thesis, KTH, Beräkningsbiofysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-90830.
Texto completoQC 20120313
MORGAN, Keith J. "Quality Assessment in English Universities". 名古屋大学高等研究教育センター, 2003. http://hdl.handle.net/2237/16569.
Texto completoAniche, 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.
Korn, Alexandra. "Information System Quality Assessment Methods". Master's thesis, Vysoká škola ekonomická v Praze, 2014. http://www.nusl.cz/ntk/nusl-193230.
Texto completoAlam, M. (Md ). "Automatic ECG signal quality assessment". Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201906052442.
Texto completoPater, Susan, Dr Peder Cuneo, James English, Dean Fish, Tim Kock, Dr John Marchello y Bob Peterson. "Quality Assurance and Food Safety: Trainer's Reference". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2004. http://hdl.handle.net/10150/144704.
Texto completoOriginally developed in Iowa and adapted for Arizona. Arizona Youth Livestock Quality Assurance Member Manual; Arizona Youth Livestock Quality Assurance Activity Guide.
This trainer's reference is for use in implementing the youth livestock quality assurance program. The curriculum is designed to provide youth and adults with a better understanding of the risks involved in the food production industry, better understand the Good Production Practices (GPP's) that can help them produce a safer product and therefore, implement these GPP's in their own livestock production system.
Akande, Valentine A. "Assessment of pelvic disease with reference to fertility". Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368393.
Texto completoGens, Rüdiger. "Quality assessment of SAR interferometric data". Hannover : Fachrichtung Vermessungswesen der Univ, 1998. http://deposit.ddb.de/cgi-bin/dokserv?idn=95607121X.
Texto completoTabladillo, Mark Z. "Quality management climate assessment in healthcare". Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/24162.
Texto completoTilney, Henry Simon. "Quality assessment in rectal cancer surgery". Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.502120.
Texto completoLothian, Andrew. "Landscape quality assessment of South Australia". Title page, table of contents, abstract and detailed contents only, 2000. http://hdl.handle.net/2440/37804.
Texto completoThesis (Ph.D.)--School of Social Sciences, 2000.
Verhagen, Arianne Petra. "Quality assessment of randomised clinical trials". [Maastricht] : Maastricht : Universitaire Pers Maastricht ; University Library, Maastricht University [Host], 1999. http://arno.unimaas.nl/show.cgi?fid=6863.
Texto completoLindquist, Malin. "Electronic tongue for water quality assessment /". Örebro : Örebro universitetsbibliotek, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-870.
Texto completoYang, Kai-Chieh. "Perceptual quality assessment for compressed video". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3284171.
Texto completoTitle from first page of PDF file (viewed Mar. 14, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 149-156).
Sharma, Monika. "New approaches to wood quality assessment". Thesis, University of Canterbury. School of Forestry, 2013. http://hdl.handle.net/10092/7549.
Texto completoOberoi, Usha. "Quality assessment of a service product". Thesis, Bournemouth University, 1989. http://eprints.bournemouth.ac.uk/369/.
Texto completoRix, Antony W. "Perceptual techniques in audio quality assessment". Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/14286.
Texto completoAljumaili, Mustafa. "Data Quality Assessment : Applied in Maintenance". Doctoral thesis, Luleå tekniska universitet, Drift, underhåll och akustik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26088.
Texto completoZhang, Wei. "Visual saliency in image quality assessment". Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/100239/.
Texto completoLopes, Marta Filipa Lobão. "Ecological quality assessment in transitional systems". Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14856.
Texto completoEstuaries are poles of attraction for human settlement which is a source of pressures to surface water bodies. The implementation of the European Water Framework Directive (WDF, 2000/60/EC) has increased the investigation in order to develop methodologies to assess the Ecological Quality Status (EQS) of aquatic ecosystems. Transitional systems are naturally stressed and characterized by highly dynamic physical, chemical and hydro-morphologic conditions and by species with a higher level of tolerance to change, being more difficult to develop suitable quality indicators for these systems. The general purpose of this study is to test the ability of synthesis descriptors, including primary (S, taxa richness) and derived biological variable (H’, Shannon-Wiener diversity), biotic indices (AMBI and M-AMBI), body size properties (abundance distribution by body size classes, length, weight and length-weight relationships) and non-taxonomic indices (ISS), as well as functional indicators related to the decomposition rates of various experimental substrates, a macrophyte (Phragmites australis) and an alga (Fucus vesiculosus), to evaluate the environmental quality in transitional systems. This study was carried out in one of the most pristine channels of the Ria the Aveiro, Mira Channel, along a full salinity gradient and in a metals and metalloid sediment contamination area, the Estarreja Channel, and two reference channels (Canelas and Salreu). In this study were used different sampling techniques, the leaf-bag technique and a hand-held corer. In Mira Channel, the alga and the macrophyte presented an opposite trend in the decomposition rate along the salinity gradient, with the decomposition rates of the alga always higher than those of the macrophyte. The decomposition rates of the macrophyte and the alga were higher in the mid estuary and in higher salinity areas, respectively, corresponding to the preferencial distribution areas of each species. The macrobenthic fauna associated with the decaying and an artificial substrate (control) showed equally well the benthic succession from the marine to the freshwater areas and, despite the strong differences in the decay rates, no significant differences were found between the benthic communities associated with the alga and the macrophyte. The body size properties of the macrobenthic fauna associated with the P. australis leaf-bag (1mm and 5mm) and corer samples were studied along the full salinity gradient. The dominant species of the sub-set of measured specimens were not the same of the original macrobenthic fauna sampled but, despite that, the sub-set of measured specimens was also able to show the benthic succession from the marine to the freshwater areas. The body size abundance distribution of the benthic macroinvertebrates according to the ISS size classes did not show a particular trend in any sampler along the salinity gradient. Significant differences were found in the length, weight and length-weight relationships of Annelids, , Molluscs and even some species along the salinity gradient. No significant differences were found in the AMBI, M-AMBI and ISS values along the salinity gradient for all the samplers. The EQS of the corer samples obtained using the M-AMBI was lower than that of the leaf-bags. The EQS obtained with the ISS was higher than that obtained with the M-AMBI in the leaf-bags but not in the corer samples. The ecological effects of contaminated sediments associated with the industrial chemical effluents discharged in the Estarreja Channel were studied a decade after ceasing the emissions, using the Sediment Quality Triad approach and two reference channels. The results showed that despite the emissions ceased in 2004, the sediment remains polluted with high levels of metals and metalloid, available to bioaccumulation and with severe consequences at the community level. The sediment contamination problem was also studied using the leaf-bag technique with a macrophyte, an alga and a control substrate. The results showed that the decay rates, the associated macrofauna and the application of the AMBI, M-AMBI and ISS indices to the mesh-bag samples were not able to identify the sediment contamination. Contrarily to the AMBI, the M-AMBI and the ISS showed significant differences between the contaminated and the reference channels for the corer samples. Although such statistical significance, the interest of using these complex biotic indices could be questioned, when much simple ones, like the S and H’ allow to reach the same conclusions.
Os estuários são pólos de atração para a instalação de aglomerados humanos, constituindo uma fonte de pressão para as massas de água superficiais. Com a implementação da Diretiva Europeia Quadro da Água (DQA, 2000/60/CE) tem aumentado a investigação no sentido de desenvolver metodologias para avaliar o estado de qualidade ecológica (EQE) dos ecossistemas aquáticos. Os sistemas de transição são caracterizados por condições físico-químicas e hidromorfológicas extremamente dinâmicas e por espécies com uma maior tolerância à mudança, sendo difícil desenvolver indicadores de qualidade adequados para estes ecossistemas. O objetivo deste estudo é testar a capacidade de descritores de síntese, tais como a riqueza em espécies (S) e a diversidade de Shannon-Wiener (H'), índices de base taxonómica (AMBI e M-AMBI) e não taxonómica (ISS), as propriedades do tamanho corporal (distribuição de abundância por classes de tamanho corporal, comprimento, peso e relações comprimento-peso), bem como indicadores funcionais (taxas de decomposição de uma macrófita (Phragmites australis) e uma alga (Fucus vesiculosus)), para avaliar a qualidade ambiental dos sistemas de transição. Este estudo foi realizado ao longo de um gradiente completo de salinidade num dos canais com menor impacto antropogénico da Ria de Aveiro, o Canal de Mira, numa área com contaminação sedimentar por metais e metaloides, o Canal de Estarreja, e dois canais de referência (Canelas e Salreu). Neste estudo foram utilizadas diferentes técnicas de amostragem, a técnica dos sacos de folha e corers. No Canal de Mira, a alga e a macrófita apresentaram uma tendência oposta na taxa de decomposição ao longo do gradiente de salinidade, com as taxas de decomposição da alga sempre superiores. As taxas de decomposição da macrófita e da alga foram mais elevadas a meio do estuário e em áreas de maior salinidade, respetivamente, correspondendo às preferenciais áreas de distribuição de cada espécie. A fauna bentónica associada aos substratos orgânicos e a um substrato artificial (controlo) mostrou a sucessão bentónica ao longo do gradiente estuarino e, apesar das grandes diferenças nas taxas de decomposição, não foram encontradas diferenças nas comunidades bentónicas entre ambos os substratos. As propriedades do tamanho corporal da fauna bentónica dos sacos de folhas de P. australis (1mm e 5mm) e corers foram estudadas ao longo do gradiente estuarino. As espécies dominantes do sub-conjunto de espécimes medidos não são as mesmas da fauna bentónica original mas, apesar disso, foram capazes de mostrar a sucessão bentónica ao longo do gradiente salino. A distribuição da abundância pelas classes de tamanho estabelecidas para o cálculo do índice ISS não mostrou nenhuma tendência ao longo do gradiente de salinidade em nenhum dos amostradores. Foram encontradas diferenças significativas no comprimento, peso e na relação comprimento-peso dos Anelídeos, Artrópodes, Moluscos e de algumas espécies ao longo do gradiente de salinidade. Não foram encontradas diferenças significativas nos valores AMBI, M-AMBI e ISS ao longo do gradiente estuarino. O EQE das amostras dos corer foi inferior ao dos sacos de folhas. O EQE obtido com o ISS foi mais elevado do que o obtido com o M-AMBI nos sacos de folha, mas não nas amostras do corer. Os efeitos ecológicos associados à contaminação dos sedimentos por efluentes químicos lançados no Canal de Estarreja foram estudados uma década após a sua cessação, recorrendo à Tríade de Qualidade Sedimentar e dois canais de referência. Os resultados mostraram que o sedimento permanece contaminado com elevados níveis de metais e metaloide, disponíveis para serem bioacumulados e com graves consequências ao nível da comunidade. A contaminação do sedimento foi também estudada utilizando a técnica dos sacos de folhas com a macrófita, a alga e um substrato de controlo, tendo-se verificado que as taxas de decomposição, a macrofauna associada e a aplicação dos índices AMBI, M-AMBI e ISS aos sacos de folhas não foram capazes de identificar o problema. Ao contrário do AMBI, o M-AMBI e o ISS apresentaram diferenças significativas entre o canal contaminado e os canais de referência para as amostras do corer. No entanto, a utilização de índices tão complexos é questionável, na medida em que índices mais simples, tais como a S e a H', permitem chegar às mesmas conclusões.
Komak, Wagma, Jeremy Smart y Jennifer White. "Quality Assessment of Internet Pharmaceutical Products". The University of Arizona, 2007. http://hdl.handle.net/10150/624403.
Texto completoObjectives: The purpose of this study is to assess the quality of study medications obtained without a prescription through international websites. Methods: Samples of levothyroxine, warfarin, and sildenafil were obtained through various websites and compared to U.S. standards. Each sample was physically evaluated for weight, color, shape, and external tablet markings. High performance liquid chromatography (HPLC) was performed to quantify the amount of active ingredient. Results: When physically inspected, only 3 of the 9 lots met FDA labeling requirements. Three of 60 (20 tablets from 3 lots) of the individual levothyroxine tablets were out of the USP acceptable range (90% - 110%). For warfarin, 16 of the 60 samples (20 samples from 3 lots) of the individual tablets were out of the USP acceptable range (95% - 105%). When averaged, each of the lots for both levothyroxine and warfarin were within their USP acceptable ranges. As sildenafil is not available as generic in the U.S., there is no USP standard acceptable range for comparison. All of the sildenafil samples fell within 90%- 105% of Viagra® tablets obtained from a local pharmacy. Conclusions: While there were a few samples outside of the U.S. acceptable range, the majority of samples analyzed for active ingredient were within the range published in the USP. While the outcomes of this study presented interesting findings, further evaluation in larger studies is needed to properly assess the quality of foreign medications purchased over the internet.
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 completoKırer, Tuğba Tayfur Gökmen. "Groundwater quality assessment in Torbalı region/". [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/cevremuh/T000144.rar.
Texto completoIvkovic, Goran. "An Algorithm for Image Quality Assessment". [Tampa, Fla.] : University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000049.
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