H 264 Standard
Mostrando 13-24 de 25 artigos, teses e dissertações.
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13. Desenvolvimento de Arquiteturas de Alto Desempenho dedicadas à compressão de vídeo segundo o Padrão H.264/AVC / Design of high performance architectures dedicated to video compression according to the H.264/AVC standard
A compressão de vídeo é essencial para aplicações que manipulam vídeos digitais, em função da enorme quantidade de informação necessária para representar um vídeo sem nenhum tipo de compressão. Esta tese apresenta o desenvolvimento de soluções arquiteturais dedicadas e de alto desempenho para a compressão de vídeos, com foco no padrão H.264
Publicado em: 2008
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14. Capacidade física e o metaborreflexo em pacientes obesos mórbidos com síndrome da apneia obstrutiva do sono / Physical capacity and metaborreflex of peripheral muscle in morbidy obese patients with syndrome of obstructive sleep apnea
Previous studies have shown that obese individuals with syndrome of obstructive sleep apnea (OSA) present attenuated skeletal muscle metaborreflex. Muscle blood flow (MBF) evaluated by venous occlusion plethysmography has been used as marker of neurovascular control. In the present study, exercise capacity was measured by the distance performed in the six-mi
Publicado em: 2008
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15. Projeto de sistemas digitais complexos : uma aplicação ao decodificador H.264 / Complex digital systems design: An H.264 decoder case study
A evolução dos processos de fabricação de circuitos microeletrônicos coloca um número cada vez maior de dispositivos à disposição do projetista de circuitos integrados. Mais e mais funcionalidades são adicionadas aos equipamentos eletrônicos com um aumento correspondente no esforço de projeto. Aplicações de multimídia e comunicação digital,
Publicado em: 2007
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16. Compensação de movimento utilizando módulos multi-escala e forma variável em um CODEC de vídeo híbrido
In the H.264/AVC video coding standard, motion compensation can be performed by partitioning macroblocks into square or rectangular sub-macroblocks in a quadtree decomposition. This work studies a motion compensation method using wedges, i.e. partitioning macroblocks or sub-macroblocks into two regions by an arbitrary line segment. This technique allows the
Publicado em: 2007
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17. MOTION ESTIMATION METHOD WITH SUBPIXEL RESOLUTION OF CODEC H264/AVC / MÉTODOS DE ESTIMAÇÃO DE MOVIMENTO COM RESOLUÇÃO EM SUBPIXEL NO CODEC H264/AVC
The MPEG (Moving Picture Experts Group) and the VCEG (Video Coding Experts Group) have developed a new video compression standard entitled AVC (Advanced Video Coding). This standard offers the capacity of video compression greater than the previous standards.The motion estimation which is a phase of the video compression is extremely computer-intensive and t
Publicado em: 2007
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18. ALGORITMO RÁPIDO DE ESTIMAÇÃO ADAPTATIVO AO MOVIMENTO APLICADO AO CODIFICADOR PADRÃO H.264/AVC / FAST MOTION ADAPTIVE ESTIMATION ALGORITHM APPLIED TO THE H.261/AVC STANDARD CODER
As técnicas de estimação de movimento utilizadas nos padrões de compressão de vídeo proporcionam a utilização mais eficiente dos recursos de transmissão e armazenamento, através da redução do número de bits necessários para representar um sinal de vídeo e da conservação da qualidade do conteúdo que está sendo processado. O objetivo dessa d
Publicado em: 2007
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19. 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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20. Determinants of degradability among sugarcane clones in bovine rumen / Determinantes da degradabilidade entre clones de cana-de-aÃÃcar no rÃmen de bovinos
The objective of this work was to evaluate the variability of nutritive value among sugarcane clones, to estimate the correlation between plant digestibility and productivity, and to define which agronomical and chemical traits would be most important as determinants of nutritive value. Twenty sugarcane industrial clones were evaluated in a completely random
Publicado em: 2004
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21. Comparison of aminoglycoside pharmacokinetics in Asian, Hispanic, and Caucasian patients by using population pharmacokinetic methods.
A population pharmacokinetic model for aminoglycosides was developed from 24 Hispanic, 16 Asian, and 22 Caucasian patients. A nonparametric expectation maximization algorithm for population modeling was used. With this one-compartment model, the parameters were the slope of the apparent volume of distribution versus weight (VS) and the slope of the eliminati
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22. Disposition of cefotaxime and desacetyl cefotaxime during continuous ambulatory peritoneal dialysis.
The disposition of cefotaxime (CTX) and desacetyl cefotaxime (DAC) was studied in eight noninfected patients on continuous ambulatory peritoneal dialysis. Each patient received a single intravenous (i.v.) infusion and an intraperitoneal (i.p.) instillation of 2 g of CTX. Multiple blood and dialysate samples were collected during the 72-h period after drug ad
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23. Comparison of high-pressure liquid chromatography and bioassay for determination of ciprofloxacin in serum and urine.
Ciprofloxacin was given orally to 10 healthy volunteers for seven consecutive doses of 250 mg every 12 h. Serum and urine samples were collected at distinct times between 0 and 96 h and analyzed both by high-pressure liquid chromatography and by a microbiological assay. The detection limits were 0.006 and 0.03 microgram/ml, respectively. For each method, imp
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24. Crystal structure of an H-2Kb-ovalbumin peptide complex reveals the interplay of primary and secondary anchor positions in the major histocompatibility complex binding groove.
Sequence analysis of peptides naturally presented by major histocompatibility complex (MHC) class I molecules has revealed allele-specific motifs in which the peptide length and the residues observed at certain positions are restricted. Nevertheless, peptides containing the standard motif often fail to bind with high affinity or form physiologically stable c