Method and encoder for constrained soft-decision...

Details Method and encoder for constrained soft-decision... Method and encoder for constrained soft-decision...

H - Electricity

04

N

H04N 7/30 (2006.01) H04N 7/28 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2732218

A method of encoding a video using constrained soft-decision quantization. The soft-decision quantization includes first performing hard-decision quantization to obtain hard quantized coefficients and, then, obtaining a soft quantized coefficient using a rate-distortion calculation over a search range of quantization levels for a transform domain coefficient, wherein the search range of quantization levels for that transform domain coefficient is constrained within a number of quantization levels of a corresponding hard quantized coefficient. The search range may be based upon a fixed threshold, the coefficient position, the hard quantized coefficient magnitude, a threshold value less accumulated distortion, or other factors, including combinations of these factors. The accumulated distortion may be measured by an L1 norm.

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