Device and method for coding video pictures

Details Device and method for coding video pictures Device and method for coding video pictures

1996-04-24

1998-06-16

Boudreau, Leo H.

Image analysis

Image compression or coding

Transform coding

382239, 382251, 348405, G06K 936, G06K 946

Patent

active

057684367

ABSTRACT:
The picture quality of an MPEG-encoded video signal is improved considerably by reducing the coefficients after quantization in such a way that the "Lagrangian cost" D+.lambda.R (D is distortion, R is bitrate) is minimal for a given value of the "Lagrange multiplier" .lambda.. The distortion decreases because the step size is reduced while the bitrate remains equal.

REFERENCES:
patent: 5426512 (1995-06-01), Watson
patent: 5495292 (1996-02-01), Zhang et al.
Ramchandran et al, "Rate-Distortion Optimal Fast Thresholding With Complete JPEG/MPEG Decoder Compatibility" IEEE Transactions On Image Processing, vol. 3, No. 5, Sep. 1994, pp. 700-704.

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