Multiple description transform coding of images using optimal transforms of arbitrary dimension

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United States of America Patent

PATENT NO 6330370
APP PUB NO 20010016080A1
SERIAL NO

09163655

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Abstract

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A multiple description (MD) joint source-channel (JSC) encoder in accordance with the invention encodes n components of an image signal for transmission over m channels of a communication medium. In an illustrative embodiment which uses statistical redundancy between the different descriptions of the image signal, the encoder forms vectors from transform coefficients of the image signal separated both in frequency and in space. The vectors may be formed such that the spatial separation between the transform coefficients is maximized. A correlating transform is then applied, followed by entropy coding, grouping as a function of frequency, and application of a cascade transform. In an illustrative embodiment which uses deterministic redundancy between the different descriptions of the image signal, the encoder may apply a linear transform, followed by quantization, to generate the multiple descriptions of the image signal. For example, vectors may be formed from transform coefficients of the image signal so as to include coefficients of like frequency separated in space. The vectors are expanded by multiplication with a frame operator, and then quantized using a step size which may be a function of frequency.

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Patent Owner(s)

Patent OwnerAddress
WSOU INVESTMENTS LLC11150 SANTA MONICA BLVD SUITE 1400 LOS ANGELES CA 90025

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Goyal, Vivek K Hoboken, NJ 15 186
Kovacevic, Jelena New York, NY 22 539
Vetterli, Martin Grandvaux, CH 57 871

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