Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Patent
1997-03-21
1999-06-15
Moore, David K.
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
358461, G06K 940
Patent
active
059129921
ABSTRACT:
It is possible to clearly extract objects such as characters and line figures by eliminating the effect of shading from an input image containing self-shaded objects and/or vaguely contoured objects together with distinctly contoured object and thereby to extract all objects clearly and completely. A sample point setting portion sets sample points, a sample point shade calculating portion determines an optical density of shading at each sample point according to an optical density distribution of pixels in a reference block including the sample point at the center thereof. A shade calculating portion determines shade densities at the other points than the sample points and generates shade image, a shade removing portion generates a shade-removed image by removing the shading effect from the input image by using the shade image. A quantizing portion binarizes the shade-removed image and an image output portion outputs the obtained binary image.
REFERENCES:
patent: 4163257 (1979-07-01), White
patent: 4977605 (1990-12-01), Fardeau et al.
patent: 5621824 (1997-04-01), Ijiri et al.
Kitamura Yoshihiro
Nakamura Mitsuaki
Saiga Hisashi
Sawada Yuji
Billings Chad
Moore David K.
Sharp Kabushiki Kaisha
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