Quantization process for video encoding

Details Quantization process for video encoding Quantization process for video encoding

1997-08-18

2000-11-14

Couso, Jose L.

Image analysis

Image compression or coding

Interframe coding

348405, G06K 936

Patent

active

061481076

ABSTRACT:
A block based signal compression system, as for example for coding video signal, and employing quantization of codewords or transform coefficients includes circuitry for adaptively controlling the quantization. Adaptivity of quantization is made a function of several parameters. One parameter is coding cost or bandwidth, wherein coding cost is generated on a macroblock basis but averaged over a window of macroblocks centered on a macroblock currently to be quantized. Another parameter is block or macroblock motion attributes, wherein block motion attribut values are used to modify the quantizing function.

REFERENCES:
patent: 5144424 (1992-09-01), Savatier
patent: 5231484 (1993-07-01), Gonzales et al.
patent: 5650860 (1997-07-01), Uz
Cho, et al., "A Region-Based Adaptive Perceptual Quantization Technique for MPEG Coder", IEICE Trans. Inf. & Syst., vol. E79-D, No. 6, Jun. 1996, pp. 737-742.
Keesman, et al., "Bit-Rate Control for MPEG Encoders", Signal Processing:Image Communication, No. 6, Feb. 1995, pp. 545-560.

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