- 专利标题: Iterative smoothing technique for pre-processing mixed raster content planes to improve the quality of a decompressed image and increase document compression ratios
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申请号: US09733860申请日: 2000-12-07
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公开(公告)号: US06334001B2公开(公告)日: 2001-12-25
- 发明人: Ricardo L. de Queiroz , Reiner Eschbach , William A. Fuss , Robert R. Buckley
- 申请人: Ricardo L. de Queiroz , Reiner Eschbach , William A. Fuss , Robert R. Buckley
- 主分类号: G06K936
- IPC分类号: G06K936
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.