Ora Gendler

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Real-time multimedia applications often require efficient bit-rate reduction. This is mainly done by requantization, usually in the DCT domain. This work introduces theoretical rate-distortion analysis that allows for straightforward selection of the quantization step needed to achieve a given bit-rate. The analysis is based on the Laplace-like distribution(More)
Real-time multimedia applications often require efficient bitrate reduction. This is mainly done by requantization, usually in the DCT domain. This work introduces theoretical rate-distortion analysis that allows for straightforward selection of the quantization step needed to achieve a given bit-rate. The analysis is based on the Laplace-like distribution(More)
It is well known that both the rate and the distortion of re-compressed images depend primarily on the ratio between the new and the old quantization steps used. In this paper we provide a theoretical basis to this observation, and introduce an efficient algorithm to select the recompression quantization step. Our approach is based on the structure of the(More)
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