Encoding apparatus and method

Details Encoding apparatus and method Encoding apparatus and method

2005-03-10

2008-12-02

Philippe, Gims S (Department: 2621)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C382S251000

Reexamination Certificate

active

07460597

ABSTRACT:
An encoding apparatus and method prevents image deterioration generated by repeatedly performing encoding and decoding by using a quantization matrix for quantization which is different from a quantization matrix for inverse quantization. In the encoding apparatus, a matrix selector selects a first quantization matrix in accordance with the complexity of an encoded picture pattern, and supplies a quantizer with information on the selected first quantization matrix. A matrix unit rewrites, by information on a second quantization matrix, the information described in an encoded stream output from a variable length code unit so that a quantization matrix to be used for inverse quantization is a second quantization matrix different from the first quantization matrix.

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