Image analysis – Image compression or coding – Quantization
Patent
1995-04-13
1998-03-03
Couso, Yon J.
Image analysis
Image compression or coding
Quantization
382250, G06K 936
Patent
active
057244529
ABSTRACT:
A quantization estimating method for data compression comprises: a first step of making a calculation of code length for each DCT period per quantizer; a second step of successively executing, per quantizer, cumulative operations of the code lengths for the small blocks which consist of a plurality of DCTs and determining a quantizer to be commonly used for the large block which consists of N small blocks in the range where no overflow takes place; a third step of executing an operation of total code length at the time when the quantization level of the quantizer determined at the second step is replaced, per small block, with a higher quantization level, and determining, for each small block, each optimum quantizer which can be used in the range where no overflow takes place; and a fourth step of selecting each optimum quantizer for each small block.
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Couso Yon J.
Matsushita Electric - Industrial Co., Ltd.
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