发明名称 |
Coding method and apparatus for input image data and a recording medium performing such method |
摘要 |
The present invention includes methods and apparatus for attaining high speed coding and decoding. A first method decreases the number of memory access times by performing signal format conversion, orthogonal transform and continuous variable-length coding with predetermined small areas in a frame used as units. A second method omits orthogonal transform computation by using orthogonal transform coefficients to shorten the processing time. A third method uses additions and subtractions for orthogonal transform thereby decreasing the number of registers used and reducing the number of memory access times. The present invention further includes a decoding method for variable-length decoding wherein table size is not made larger because the number of table access times per code word is set to a maximum of 2, and plural code words are decoded by one table access operation to attain high-speed decoding.
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申请公布号 |
US7050644(B2) |
申请公布日期 |
2006.05.23 |
申请号 |
US20040786147 |
申请日期 |
2004.02.26 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
JURI TATSURO;ONO TADASHI |
分类号 |
G06K9/46;G06K9/34;G06T9/00;H04N7/26;H04N7/30;H04N7/50 |
主分类号 |
G06K9/46 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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