发明授权
- 专利标题: Image processing apparatus
- 专利标题(中): 图像处理装置
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申请号: US929630申请日: 1986-11-10
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公开(公告)号: US4717964A公开(公告)日: 1988-01-05
- 发明人: Yoshinori Abe , Masahiko Matsunawa , Seiichiro Hiratsuka
- 申请人: Yoshinori Abe , Masahiko Matsunawa , Seiichiro Hiratsuka
- 申请人地址: JPX Tokyo
- 专利权人: Konishiroku Photo Industry Co.
- 当前专利权人: Konishiroku Photo Industry Co.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX60-257491 19851115; JPX60-257496 19851115; JPX60-257497 19851115
- 主分类号: H04N1/40
- IPC分类号: H04N1/40
摘要:
The present invention is to provide an image processing apparatus having structure for forming a halftone image in such manner that, on a multicoded image consisting of regions differing in density formed by multicoding by using a prescribed threshold value matrix, a plurality of differing scanning unit areas are brought each to the multicoded image for each pixel in a successive manner so as to obtain values based on the ratios between the regions differing in density of the multicoded image within the unit areas, then density patterns are obtained from the above value by using the threshold value matrix, and then the halftone image is made by comparing the density patterns with the multicoded image within the unit areas, and the image processing apparatus further has structure for making the position of the threshold value matrix used for obtaining the multicoded image coincide with the position of the threshold value matrix used for obtaining the density pattern.