发明名称 |
ADAPTIVE VIDEO COMPRESSION |
摘要 |
The fidelity of compressed images is improved by computing a scaling value for each block based on a perceptual classification performed in the spatial domain. This provides a computationally simple way to reduce artifacts by computing appropriate block-variable scale factors for the quantization tables used in frequency domain-based compression schemes such as the JPEG compression standard. Because a scale factor for a block is determined based on computations performed in the spatial domain, such computations can be made in parallel with the Discrete Cosine Transform (DCT) computation. <IMAGE> |
申请公布号 |
EP0974932(A3) |
申请公布日期 |
2001.02.07 |
申请号 |
EP19990304700 |
申请日期 |
1999.06.16 |
申请人 |
HEWLETT-PACKARD COMPANY |
发明人 |
MEMON, NASIR;TRETTEN, DANIEL R. |
分类号 |
H04N1/41;G06T9/00;H04N7/26;H04N7/30;(IPC1-7):G06T9/00 |
主分类号 |
H04N1/41 |
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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