发明名称 |
Low cost video compression using fast, modified Z-coding of wavelet pyramids |
摘要 |
An entropy efficient video coder for wavelet pyramids approaches the entropy-limited coding rate of video wavelet pyramids, is fast in both hardware and software implementations, and has low complexity (no multiplies) for use in ASICs. It uses a modified Z-coder to code the zero/non-zero significance function and Huffman coding for the non-zero coefficients themselves. The encoding unit includes a significance function generator that receives coefficients and outputs a single significance bit. A zero coefficient eliminator receives coefficients in parallel with the significance function generator and outputs coefficients if non-zero. Output from the significance function generator is coded using the modified Z-coder. Output from the zero coefficient eliminator is coded using Huffman coding. Both outputs are combined to form the resulting compressed stream. The modified Z-coder is similar to a standard Z-coder but uses a different technique for the LPS (least probable symbol) case during encoding and decoding that results in a Z-coder that functions appropriately.
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申请公布号 |
US6570924(B1) |
申请公布日期 |
2003.05.27 |
申请号 |
US19990444226 |
申请日期 |
1999.11.19 |
申请人 |
INTERVAL RESEARCH CORP |
发明人 |
LYNCH WILLIAM C.;KOLAROV KRASIMIR D.;ARRIGHI WILLIAM J. |
分类号 |
G06T9/00;H03M7/40;H04N7/26;(IPC1-7):H04N7/12;H04N11/02;H04N11/04 |
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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