Orthogonal transform encoder using DC component to control quant

Details Orthogonal transform encoder using DC component to control quant Orthogonal transform encoder using DC component to control quant

1992-10-02

1994-11-29

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348395, H04N 7133

Patent

active

053694392

ABSTRACT:
According to orthogonal transformation coefficients obtained through orthogonal transformation, the degree of influence on visual sensation is detected. Depending on the degree of influence on visual sensation, a quantization step size is controlled so as to assign a greater amount of codes to each block of which image quality deterioration is conspicuous and a smaller amount of codes to each block of which image quality deterioration is less conspicuous.

REFERENCES:
patent: 4580162 (1986-04-01), Mori
patent: 5006931 (1991-04-01), Shirota
patent: 5121216 (1992-06-01), Chen et al.
patent: 5196933 (1993-03-01), Henot
Y. S. Ho et al., "Classified Transform Coding of Images Using Vector Quantization", ICASSP 89 Multi-Dimensional Signal Processing, vol. 3, pp. 1890-1893 (May 23, 1989).
J. W. Kim et al., "Discrete Cosine Transform-Classified VQ Technique for Image Coding", ICASSP 89 Multi-Dimensional Signal Procesing, vol. 3, pp. 1831-1834 (May 23, 1989).

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