发明公开
- 专利标题： Image processing method and apparatus
- 专利标题（中）： Bildverarbeitungsverfahren und -vorrichtung
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申请号： EP97200734.8申请日： 1991-12-17
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公开(公告)号： EP0785669A2公开(公告)日： 1997-07-23
- 发明人: Katayama, Akihiro , Yasuda, Yasuhiko
- 申请人： CANON KABUSHIKI KAISHA
- 申请人地址： 30-2, 3-chome, Shimomaruko, Ohta-ku Tokyo JP
- 专利权人： CANON KABUSHIKI KAISHA
- 当前专利权人： CANON KABUSHIKI KAISHA
- 当前专利权人地址： 30-2, 3-chome, Shimomaruko, Ohta-ku Tokyo JP
- 代理机构： Beresford, Keith Denis Lewis
- 优先权： JP403548/90 19901219
- 主分类号： H04N1/41
- IPC分类号： H04N1/41 ; H04N1/415 ; H04N1/64
摘要：
Method and apparatus for efficiently encoding image data of a color facsimile or the like are provided. A specific color judgment unit discriminates a specific color portion such as white or blank portion of the image data inputted from an image input unit. An orthogonal transforming process is not executed to the blank block, thereby raising an encoding efficiency. A discrimination signal is subjected to a dynamic arithmetical encoding, thereby producing code data.
公开/授权文献
- EP0785669B1 Image processing method and apparatus 公开/授权日：2005-08-10
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