发明授权
- 专利标题: Irradiation field recognizing method, and method of adjusting image processing conditions using the same
- 专利标题(中): 照射场识别方法以及使用其的图像处理条件的调整方法
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申请号: US143100申请日: 1988-01-12
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公开(公告)号: US4859850A公开(公告)日: 1989-08-22
- 发明人: Takeshi Funahashi , Masamitsu Ishida
- 申请人: Takeshi Funahashi , Masamitsu Ishida
- 申请人地址: JPX Kanagawa
- 专利权人: Fuji Photo Film Co., Ltd.
- 当前专利权人: Fuji Photo Film Co., Ltd.
- 当前专利权人地址: JPX Kanagawa
- 优先权: JPX62-4552 19870112; JPX62-4553 19870112; JPX62-4554 19870112
- 主分类号: G03C5/16
- IPC分类号: G03C5/16 ; G06K9/32
摘要:
In a method of recognizing an irradiation field, sample image signals at a picture element string extending from an edge of a recording region towards the center thereof are extracted from image signals detected from a recording medium. Changes among image density levels represented by the sample image signals are expressed by an approximate equation, and differences between imaginary density levels calculated by the approximate equation and actual density levels are calculated to find an edge of the irradiation field. Or, intersections of lines represented by approximate equations for picture element groups and a density change curve in a range higher than a predetermined density and represented by the sample image signals are detected, and the intersection nearest to the edge of the recording region is recognized as the edge of the irradiation field. Image processing conditions are adjusted based on the image signals inside of the recognized irradiation field.