发明名称 |
Method of extracting contour of subject image from original. |
摘要 |
An image window (N) is intermittently moved along the contour (CT) of a subject image (I). At respective paused position of the image window, a spacial differential of the density level is calculated for each pixel in the image window. A differential histogram is produced from the respective differentials, and a threshold level (Eth) is determined from the differential histogram and a designated p-tile ratio. A contour image is then obtained by discriminating the respective differentials with the threshold level. |
申请公布号 |
EP0336430(B1) |
申请公布日期 |
1994.10.19 |
申请号 |
EP19890106143 |
申请日期 |
1989.04.07 |
申请人 |
DAINIPPON SCREEN MFG. CO., LTD. |
发明人 |
OHSAWA, IKUO C/O DAINIPPON SCREEN MFG. CO., LTD. |
分类号 |
G06T5/00 |
主分类号 |
G06T5/00 |
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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