Video Compression
Mostrando 25-36 de 40 artigos, teses e dissertações.
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25. Study of the audio coding algorithm of the MPEG-4 AAC standard and comparison among implementations of modules of the algorithm
Audio coding is used to compress digital audio signals, thereby reducing the amount of bits needed to transmit or to store an audio signal. This is useful when network bandwidth or storage capacity is very limited. Audio compression algorithms are based on an encoding and decoding process. In the encoding step, the uncompressed audio signal is transformed in
Publicado em: 2007
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26. Distributed coding turbo codes and second generation wavelets / Codificação distribuida de video digital utilizando codigos turbo e Waveletes de segunda geração
Distributed video coding is a new paradigm for video compression in opposition over the existing video coding standards like MPEG-x and H.26x families. These codecs make use of motion estimation algorithms, the main part of the compression process of the video signal. Hence, the compression process demands a high computational cost and high performance of th
Publicado em: 2006
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27. THE VISUAL LANGUAGE OF MTV SPOTS: VIDEODESIGN AS AN EXPRESSION OF POSTMODERN CULTURE / A LINGUAGEM VISUAL DAS VINHETAS DA MTV: VIDEODESIGN COMO EXPRESSÃO DA CULTURA PÓS-MODERNA
The research presents a case study of MTV on-air promos and discusses the relation between the visual language of MTV - with an analysis of its history, programs, sceneries, video clips and VJs -, and postmodern culture. MTV visual language may be considered a privileged locus of reproduction of postmodern expression insofar as it is a legitimate product of
Publicado em: 2006
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28. ALGORITMO DE AJUSTE ELÁSTICO PARA VÍDEO EM FLUXOS MPEG-2 / ELASTIC TIME ALGORITHM FOR VIDEO IN MPEG-2 FLOWS
In hypermedia presentations, one of the main tasks provided by the orchestrator is the synchronization of all presentation objects, which may be achieved by elastic time adjustment of period of exhibition of the objects, or simply timescale adaptation. This technique can be applied at compilation time, in order to keep track of synchronism relationships spec
Publicado em: 2005
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29. SEGMENTAÇÃO DE VÍDEO NO DOMÍNIO COMPRIMIDO BASEADA NA HISTÓRIA DA COMPACTAÇÃO / VIDEO SEGMENTATION IN THE COMPRESSED DOMAIN BASED ON THE COMPRESSION HISTORY
Este trabalho apresenta uma proposta de solução do problema de detecção de tomada de câmera de vÃdeos MPEG-1 e MPEG-2. A abordagem proposta está baseada na aplicação de diversas heurÃsticas para eliminação de quadros semelhantes, de forma a extrair um conjunto de quadros que representam os cortes entre tomadas de câmera
Publicado em: 2005
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30. Procedimentos para tratamento e compressão de imagens e video utilizando tecnologia fractal e transformadas wavelet
A excelente qualidade visual e taxa de compressão dos codificadores fractais de imagem tem aplicações limitadas devido ao exaustivo tempo de codificação inerente. Esta pesquisa apresenta um novo codificador híbrido de imagens que aplica a velocidade da transformada wavelet à qualidade da compressão fractal. Neste esquema, uma codificação fractal ac
Publicado em: 2005
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31. CÓDIGOS DE PREFIXO DE RÁPIDA DECODIFICAÇÃO / FAST DECODING PREFIX CODES
Even with the evolution of communication and storage devices, the use of complex data structures, like video and hypermedia documents, keeps increasing the demand for efficient data compression mechanisms. Prefix codes are one of the most known compressors, since they are executed by some compression methods that group different algorithms, besides presentin
Publicado em: 2003
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32. Characterization of vegetation physiognomies in earstern Amazonon region through airbone videography and landsat 7 ETM + images / Caracterização de fisionomias vegetais na Amazônia Oriental através de videografia aerotransportada e imagens landsat 7 ETM+
Transformation of multispectral remote sensing data is needed for compression of data volume and for the inference of biophysical properties of the land cover. Linear Spectral Mixing Models (LSMM) and Normalized Difference Vegetation Index (NDVI) are transformations that result in indicators of vegetation structure. However these methods present limitations
Publicado em: 2003
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33. Design and testing of ECE radiometer for Sinp-Tokamak
A multi channel ECE Radiometer, in the frequency range of 75 - 110 GHz, has been designed, constructed and tested for the SINP-Tokamak to diagnose second harmonic X-mode electron cyclotron emission (ECE). This frequency range covers approximately 80% of the plasma cross section in case of a magnetic eld of B = 1.5 T. For the maximum field of the SINP-Tokamak
Brazilian Journal of Physics. Publicado em: 2002-03
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34. Processamento e compressão do sinal de video utilizando a transformada wavelet
A study of the applicability of the wavelet transformed, in the processing and in video signals compression is presented in this work. The study was carried out as a consequence of the good results obtained in the application of that transform in the compression and processing of static images. A study on the main techniques of images compression, with empha
Publicado em: 2002
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35. MATHEMATICAL AND EXPERIMENTAL APPROACHES IN SHAPE-ADAPTATIVE VIDEO CODING / ABORDAGENS MATEMÁTICAS E EXPERIMENTAIS EM CODIFICAÇÃO DE VÍDEO ADAPTATIVA À FORMA
This thesis investigates shape adaptative coding of arbitrarily shaped segments. The texture and contour coding efficiency is discussed and solutions to tackle the associated problems are proposed. The presented methods are evaluated using standard image sequences. A mathematical approach for shape-adaptative transforms using linear operators is developed, f
Publicado em: 2000
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36. FAST ESTIMATION ALGORITHMS FOR VIDEO COMPRESSION: ISOLATED ANALYSIS AND IN MPEG ENVIRONMENT / ALGORITMOS RÁPIDOS DE ESTIMAÇÃO DE MOVIMENTO PARA COMPRESSÃO DE VÍDEO: ANÁLISE ISOLADA E EM AMBIENTE MPEG
Este trabalho apresenta uma análise comparativa de algoritmos rápidos de estimação de movimento para codificações de vídeo, os quais visam reduzir a complexidade computacional do algoritmo Força Bruta. Os dois primeiros ( LOGD e 3 PASSOS) reduzem extremamente a complexidade, contudo, apresentam os mais baixos desempenhos. Dois deles Eliminação Suce
Publicado em: 1997