Method of orthogonal transform coding/decoding

Details Method of orthogonal transform coding/decoding Method of orthogonal transform coding/decoding

1991-02-27

1992-01-07

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

Adaptive coding

381 36, 375122, 341106, 341155, H03M 100

Patent

active

050795473

ABSTRACT:
There is provided the method of orthogonal transform coding/decoding to quantize/de-quantize transformed coefficients which are divided into a plurality of bands to which respective different numbers of coefficient are allotted. Quantization/de-quantization tables are arranged on the basis of a probability density function of the coefficient values designed on the assumption of a specified number of coefficients so as to correspond to the number of quantization/de-quantization bits. The values in the quantization/de-quantization tables selected according to the number of quantization/de-quantization bits are adaptively compensated on the basis of an actual number of coefficients on each band to quantize/de-quantize the coefficient values.

REFERENCES:
patent: 4476458 (1984-10-01), Dollard
patent: 4573187 (1986-02-01), Bui et al.
patent: 4896362 (1990-01-01), Veldhuis et al.
patent: 4980916 (1990-12-01), Zinser
patent: 5007092 (1991-04-01), Galand et al.

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