Invention Grant
US4868671A Method of and apparatus for noise reduction in multi-gradation image
signal in halftone image reader
失效
半色调图像读取器中的多灰度图像信号中的降噪方法和装置
- Patent Title: Method of and apparatus for noise reduction in multi-gradation image signal in halftone image reader
- Patent Title (中): 半色调图像读取器中的多灰度图像信号中的降噪方法和装置
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Application No.: US136487Application Date: 1987-12-21
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Publication No.: US4868671APublication Date: 1989-09-19
- Inventor: Shigeo Murakami
- Applicant: Shigeo Murakami
- Applicant Address: JPX Kyoto
- Assignee: Dainippon Screen Mfg. Co., Ltd.
- Current Assignee: Dainippon Screen Mfg. Co., Ltd.
- Current Assignee Address: JPX Kyoto
- Priority: JPX61-304736 19861219
- Main IPC: H04N1/19
- IPC: H04N1/19 ; H04N1/409 ; H04N1/40
Abstract:
A multi-gradation image signal obtained by multi-gradationization of a signal obtained by reading through a CCD an original having a half tone is supplied to an unsharp signal producing part, which in turn outputs an unsharp signal produced from the multi-gradation image signal and the multi-gradation image signal itself. A comparator discriminates a shadow portion of the original by comparing the multi-gradation image signal with a reference value. As a result, a signal which is unsharp in the shadow portion of the original is produced from the multi-gradation image signal and the unsharp signal.
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