Rate-distortion methods for image and video compression
نویسندگان
چکیده
منابع مشابه
Rate-Distortion Optimization for Video Compression
Motion video data consists essentially of a time-ordered sequence of pictures, and cameras typically generate approximately 24, 25, or 30 pictures (or frames) per second. This results in a large amount of data, and therefore demands the use of compression. For example assume that each picture has a relatively low \QCIF" resolution, i.e., 176 144 samples, that each sample is digitally represente...
متن کاملRate Distortion Optimization in Video Compression
From Shannon’s classic rate distortion theory, we know that the main task of source coding or compression is to represent a source with the fewest number of bits possible for a given reproduction quality. Compression can be achieved with lossless techniques where the decompressed data is an exact copy of the original. However, this requirement also makes compression performance somewhat limited...
متن کاملRate-distortion optimized image compression using wedgelets
Most wavelet-based image coders fail to model the joint coherent behavior of wavelet coefficients near edges. Wedgelets offer a convenient parameterization for the edges in an image, but they have yet to yield a viable compression algorithm. In this paper, we propose an extension of the zerotree-based Space-Frequency Quantization (SFQ) algorithm by adding a wedgelet symbol to its tree-pruning o...
متن کاملRate-Distortion Based Fractal Image Compression
In fractal image compression a contractive affine mapping whose fixed point is an approximation to the original image has to be determined. Usually, this mapping is found in a heuristic way. In this paper, we discuss rate-distortion based fractal image coding where the code corresponding to the mapping is optimal in the sense that it guarantees the lowest collage error (distortion between the o...
متن کاملRate-Distortion Based Temporal Filtering for Video Compression
We consider the temporal DPCM loop at the heart of most modern high performance video coders. Targeting low bitrate-low complexity video applications , it is shown that DPCM is ineecient in this region. The DPCM codec is analyzed in the low bitrate region and rate-distortion optimal modiications are proposed that do not violate the low complexity requirement. The proposed modiications involve n...
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ژورنال
عنوان ژورنال: IEEE Signal Processing Magazine
سال: 1998
ISSN: 1053-5888
DOI: 10.1109/79.733495