发明名称 |
Adaptive block size image compression method and system |
摘要 |
An image compression system and method for compressing image data for transmission. Each block and corresponding sub-blocks of pixel data is subjected to a discrete cosine transform (DCT) operation. Varying levels of sub-blocks of resulting corresponding transform coefficients are selected for construction into a composite transform coefficient block corresponding to each input block of pixel data. The selection of transform coefficient block size for the composite block is determined by a comparison process between transform block and sub-block coding efficiency. The composite block is variable length coded to further reduce bit count in the compressed data.
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申请公布号 |
US5021891(A) |
申请公布日期 |
1991.06.04 |
申请号 |
US19900487012 |
申请日期 |
1990.02.27 |
申请人 |
QUALCOMM, INC. |
发明人 |
LEE, CHONG U. |
分类号 |
G06T9/00;G06T9/40;H03M7/30;H03M7/40;H03M7/46;H04N1/41;H04N7/26;H04N7/30 |
主分类号 |
G06T9/00 |
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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