Transformation coding apparatus

Details Transformation coding apparatus Transformation coding apparatus

1996-11-27

1998-02-03

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348404, 348411, 382199, 382234, H04N 750

Patent

active

057150044

ABSTRACT:
A transformation coding apparatus for transforming blocks of data corresponding to a boundary of an object. The apparatus includes a transformer for transforming an input block and producing transformation coefficients, a transformation coefficient selector for selecting and outputting certain transformation coefficients based on the transformation coefficients and the input block, an inverse transformer for inversely transforming the transformation coefficients selected by the transformation coefficient select means, and outputting a restored block, and an encoder for variable-length-coding the select coefficients selected by the transformation coefficient select means. A repetition controller calculates a mean square error of the input data block and the restored data block, compares, the calculated mean square error with a predetermined reference value, and determines whether to continue selecting coefficients. The transformation coding apparatus selects the coefficients which maximize the ratio of the mean square error .DELTA.MSE(k), to thereby enhance the quality of the picture and reduce the amount of necessary data bits.

REFERENCES:
patent: 5650782 (1997-07-01), Kim

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