Publication: Técnicas de pre-análisis y pre-procesado aplicadas a la codificación perceptual de vídeo
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2011-11-02
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2011-11-02
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Abstract
La codi cación de vídeo persigue el objetivo de comprimir a tasas bajas una secuencia de vídeo con una reducción mínima de la calidad percibida. Para ello, la codi cación debe asignar mayores recursos a regiones en las que la distorsión sea más perceptible, ya sea debido a su textura o por pertenecer a regiones de interés. Este Proyecto Fin de Carrera propone dos técnicas para ello: pre-análisis y pre-procesado, ambas aplicadas a la codi cación de vídeo basada en consideraciones perceptuales. Estas técnicas tienen como objetivo mejorar la calidad de la secuencia codi cada sin que ello implique un aumento de la tasa de bits. La técnica de pre-análisis consiste en el análisis de la estructura de la textura de las secuencias que en combinación con un mapa de prioridad de la región de interés, ajusta el parámetro de cuanti cación del codi cador. La técnica de pre-procesado realiza un ltrado selectivo de la secuencia antes de ser codi cada. Donde la intensidad del ltrado ( ltro bilateral, que tiene en cuenta la textura de la secuencia) de una región dependerá de si esta región pertenece o no a la región de interés. Finalmente, se incluye un conjunto de pruebas experimentales y subjetivas que se llevaron a cabo para evaluar estas técnicas. ______________________________________________________________________________________________________________________
Video encoding aims to compress at low rates a video sequence with a minimal reduction of the perceived quality. To this end, compression should allocate more resources to regions that are most sensitive to distortion, either because of their texture or belonging to the region of interest. This nal project proposes some pre-processing and pre-analysis techniques applied to video coding based on perceptual considerations. These techniques aim to improve the encoded video quality without increasing the bit rate. The pre-analysis technique analyzes the texture structure of the sequences and in combination with a priority map of the region of interest, adjusts the quanti cation parameter of the encoder. The pre-processing technique performs selective ltering before the encoding of the sequence. The intensity of the bilateral lter (a kind of lter that takes into account the texture of the sequence) of a region depends on whether or not this region belongs to the region of interest. Finally, the present project includes a set of subjective tests that were carried out to evaluate these techniques.
Video encoding aims to compress at low rates a video sequence with a minimal reduction of the perceived quality. To this end, compression should allocate more resources to regions that are most sensitive to distortion, either because of their texture or belonging to the region of interest. This nal project proposes some pre-processing and pre-analysis techniques applied to video coding based on perceptual considerations. These techniques aim to improve the encoded video quality without increasing the bit rate. The pre-analysis technique analyzes the texture structure of the sequences and in combination with a priority map of the region of interest, adjusts the quanti cation parameter of the encoder. The pre-processing technique performs selective ltering before the encoding of the sequence. The intensity of the bilateral lter (a kind of lter that takes into account the texture of the sequence) of a region depends on whether or not this region belongs to the region of interest. Finally, the present project includes a set of subjective tests that were carried out to evaluate these techniques.
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Codificación de vídeo, Proceso de imágenes