Multiple description transform coding of images using optimal transforms of arbitrary dimension
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United States of America Patent
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Dec 11, 2001
Grant Date -
Aug 23, 2001
app pub date -
Sep 30, 1998
filing date -
Feb 25, 1998
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Abstract
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)
- ALCATEL-LUCENT USA INC.;WSOU INVESTMENTS, LLC
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Goyal, Vivek K | Hoboken, NJ | 15 | 287 |
Kovacevic, Jelena | New York, NY | 23 | 645 |
Vetterli, Martin | Grandvaux, CH | 58 | 1341 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
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