Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Patent
1996-11-25
1999-11-16
Rogers, Scott
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
358445, 358446, 358461, 358497, H04N 1024, H04N 104, H04N 1407
Patent
active
059871865
ABSTRACT:
In an image processing device, a white level reference value is obtained by allowing an CCD sensor to scan a white level standard sheet. The white level reference value is stored in SRAM which is resident in a scan cartridge. The white level reference value in the SRAM is modified when an original document is read through a clear sheet, to obtain a high-quality image.
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patent: 4779141 (1988-10-01), Watanabe
patent: 5191445 (1993-03-01), Kurokawa et al.
patent: 5663806 (1997-09-01), Grise et al.
patent: 5694225 (1997-12-01), Suzuki
patent: 5721626 (1998-02-01), Kimura
Nakamura Atsushi
Oida Jun
Canon Kabushiki Kaisha
Rogers Scott
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