Quantizing apparatus and quantizing method

Details Quantizing apparatus and quantizing method Quantizing apparatus and quantizing method

1995-12-20

1998-01-06

Young, Brian K.

Coded data generation or conversion

Quantizer

H03M 300

Patent

active

057060096

ABSTRACT:
A difference signal generated in a prediction encoding process is block-segmented by a block segmenting circuit 2. Thus, the level distribution of the block-segmented difference signal is concentrated to a narrower portion than the level distribution of one entire screen. Reference values DR and MIN of each block of the difference signal are detected. A quantizing step width .DELTA. and shift data .DELTA.S are determined corresponding to such reference values and the number of quantizing bits N. A quantizing circuit 6 quantizes the difference signal with .DELTA.. The difference signal is shifted and quantized so that the level 0 of the difference signal is obtained as 0 on the decoding side. A flag FLG and a that represent the quantized value of the level 0 are transmitted as side information along with the quantized value Q.

REFERENCES:
patent: 4151550 (1979-04-01), Dinstein

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