Method of frame-by-frame calculation of quantization matrices

Details Method of frame-by-frame calculation of quantization matrices Method of frame-by-frame calculation of quantization matrices

1997-12-16

2000-05-23

Britton, Howard

Television

Bandwidth reduction system

Data rate reduction

H04N 730

Patent

active

060671181

ABSTRACT:
A method of reducing distortion in a video signal by coding a video frame utilizing a quantization matrix specifically determined for the video frame. The method includes the steps of determining the degree to which the video signal is spread about an average value, determining an average quantizer scale-value Q for the video frame, determining a reference weighted distortion for all DCT frequency bands in the video frame, determining the quantization parameter through a normalized distortion function, determining each weight for each DCT frequency band and coding the video frame taking into account the determined weights in the quantization matrix.

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