Television – Bandwidth reduction system – Data rate reduction
Patent
1997-03-19
2000-04-25
Le, Vu
Television
Bandwidth reduction system
Data rate reduction
348437, 348438, 348390, 348384, 382240, H04N 1415, H04N 750
Patent
active
060550171
ABSTRACT:
A wavelet video coding method using adaptive scanning includes subjecting the input video signal to a horizontal and a vertical wavelet decomposition to obtain base, horizontal, vertical and diagonal bands of wavelet coefficients; recursively subjecting the resulting base band to further wavelet decomposition to obtain lower layers of base, horizontal, vertical and diagonal bands of wavelet coefficients; grouping the co-sited coefficients from the different layers of horizontal, vertical and diagonal bands into horizontal, vertical and diagonal macro-bands, respectively; adaptively quantizing the above coefficients in the horizontal, vertical and diagonal macro-bands, respectively; adaptively scanning and differentially coding the quantized coefficients in the macro-bands into one dimensional arrays, using a technique which depends on the orientation of the macro-bands and the distribution of the coefficients, and entropy coding each of the arrays.
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Sheng-Mei Shen et al., "Wavelet Coefficients Scanning Methods for Video Coding", pp. 1-14, Sep. 1993 (translation of Japanese Application 6-65815).
Sheng-Mei Shen et al., "Scanning Methods for Wavelet Coefficients in Video Coding", MoMuC-1 First International Workshop on Mobile Multimedia Communications, pp. B.17-1-B.17-12 (Dec. 1993).
Shen Sheng Mei
Tan Thiow Keng
Le Vu
Matsushita Electric - Industrial Co., Ltd.
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