Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Patent
1996-02-09
2000-03-21
Au, Amelia
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
355 25, 355 82, 399362, G06K 940
Patent
active
060411465
ABSTRACT:
An image reader for reading book-like documents placed on a document platen in a face upward condition, said image reader comprises a shading reference panel provided beside the document platen which is white in color and of uniform density, an image reading device which reads the document platen on which the book-like document is placed and the shading reference panel, and outputs image data, a height detector which detects a height distribution of the book-like document, an illuminance detector which detects an illuminance irregularity in accordance with the image data corresponding to the shading reference panel, calculator which calculates shading correction data in accordance with the height distribution and the illuminance irregularity on the shading reference panel and, shading corrector which corrects the illuminance irregularity of the image data corresponding to the book-like document in accordance with the shading correction data.
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Kamon Koichi
Matsuda Shinya
Au Amelia
Johnson Timothy M.
Minolta Co. , Ltd.
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