IMAGE DECODING METHOD AND IMAGE CODING METHOD
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United States of America Patent
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Issued Date -
Jul 28, 2011
app pub date -
Jun 29, 2009
filing date -
Sep 25, 2008
priority date (Note) -
Abandoned
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Abstract
The present invention is directed to improve compression efficiency by variable-length coding in accordance with characteristics of image data to be processed. An apparatus for compressing quantized data by variable-length coding includes: a statistical information storing memory (212) for storing statistical information (MBTyp and CBPL) of coded image data; a variable-length code table generating unit (213) for generating a variable-length code table on the basis of the statistical information stored in the memory; and a variable-length coding unit (205) for performing variable-length coding on the basis of the variable-length code table. The variable-length code table generating unit generates a variable-length code table by adding occurrence probability of statistical information calculated within a predetermined range of the coded image data and initial occurrence probability selected on the basis of a coding parameter (S3005), and assigning a short code in descending order of statistical information obtained by the addition (S3006).
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