Image analysis – Histogram processing – For setting a threshold
Patent
1991-02-21
1993-07-27
Mancuso, Joseph
Image analysis
Histogram processing
For setting a threshold
358183, 358447, 358462, 382 54, G06K 948
Patent
active
052316777
ABSTRACT:
There are image processing method and apparatus for use in digital copying apparatuses, facsimile apparatuses, etc. which handle an image signal. This apparatus comprises an edge detector to detect the edge portion of the image signal, a smoothing circuit to smooth the image signal, an edge emphasizer to emphasize the edge of the image signal, and a mixer to mix the output of the smoothing circuit and the output of the edge emphasizer. A mixture ratio of the output of the smoothing circuit and the output of the edge emphasizer is varied in response to the output of the edge detector. The edge detection of the edge detector is performed due to the linear differentiation. With this apparatus, the moire in the case of a mesh original image is removed and the characters and line drawings can be reproduced with a high degree of fidelity.
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Dei Katsuhito
Kawamura Naoto
Mita Yoshinobu
Nishigaki Yuji
Canon Kabushiki Kaisha
Mancuso Joseph
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