发明名称 |
Iterative smoothing technique for pre-processing mixed raster content planes to improve the quality of a decompressed image and increase document compression ratios |
摘要 |
A method and apparatus for compressing a mixed raster content image that represents a color or gray scale a document is disclosed. The pixel map is decomposed into a three-plane representation-a reduced-resolution "upper" plane, a reduced-resolution "lower" plane, and a high-resolution binary selector plane. An iterative smoothing technique is then used to pre-process the upper and lower planes using the information contained in the selector plane, thereby reducing the amount of data that will be subjected to further processing.
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申请公布号 |
US6334001(B2) |
申请公布日期 |
2001.12.25 |
申请号 |
US20000733860 |
申请日期 |
2000.12.07 |
申请人 |
XEROX CORPORATION |
发明人 |
DE QUEIROZ RICARDO L.;ESCHBACH REINER;FUSS WILLIAM A.;BUCKLEY ROBERT R. |
分类号 |
H04N1/41;G06T5/00;H04N1/40;(IPC1-7):G06K9/36 |
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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