Adaptive quantizer with modification of high frequency coefficie

Details Adaptive quantizer with modification of high frequency coefficie Adaptive quantizer with modification of high frequency coefficie

1996-12-30

1999-04-06

Tung, Bryan

Television

Bandwidth reduction system

Data rate reduction

H04N 730

Patent

active

058925481

ABSTRACT:
A video signal encoding system, for encoding a video signal to provide an encoded signal, includes a transform coder for encoding the video signal on a block-by-block basis to generate blocks of transform coefficients, wherein the video signal includes a multiplicity of frames, each frame having blocks of pixels. A quantizer employed in the video signal encoding system comprises a quantization parameter deciding block; a quantizer control block for deciding a quantization mode signal which represents an activity of the video signal; and a quantizer which classifies transform coefficients included in each block into high frequency coefficients and low frequency coefficients based on the quantization mode signal, modifies the high frequency coefficients, to thereby provide blocks of modified transform coefficient, and quantizes the blocks of modified transform coefficients by using the quantization parameter.

REFERENCES:
patent: 5046121 (1991-09-01), Yonekawa
patent: 5333012 (1994-07-01), Singhal et al.
patent: 5426512 (1995-06-01), Watson
patent: 5440344 (1995-08-01), Asamura
patent: 5473377 (1995-12-01), Kim
patent: 5543848 (1996-08-01), Murakami
Chen and Pratt, "Scene Adaptive Coder", IEEE Transactions on Communications, vol. COM-32, No. 3, pp. 225-232, Mar. 1984.
International Standards Organization (ISO) Standard Committee Draft 11172-2, pp. D-38 and D-39, Mar. 1992.

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