Adaptive transform coding using variable block size

Details Adaptive transform coding using variable block size Adaptive transform coding using variable block size

1992-03-23

1993-08-31

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358426, 358433, 382 56, H04N 1415, H04N 141

Patent

active

052413950

ABSTRACT:
An adaptive transform coding algorithm for a still image utilizes a quadtree based variable block size discrete cosine transform to achieve a better tradeoff between bit rate and image quality. The choice of appropriate block size is made according to a mean based decision rule which can discriminate various image contents for better visual quality.

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"Scene Adaptive Coder," W. H. Chen et al., IEEE Trans. Commun. vol. COM-32, No. 3, pp. 225-232, Mar. 1984.
"Hybrid Transform Video Coding Scheme for Low Bit Rate: An Improvement of the Reference Algorithm," N. Texier et al., Proc. Picture Coding Symp., pp. 8.4-1-2, Turin, Italy, Sep. 1988.

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