Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Patent
1996-03-06
1998-03-31
Vu, Kim
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
358504, 358514, 358515, H04N 1192
Patent
active
057347590
ABSTRACT:
An image reading apparatus comprises a photoelectric converter including three linear image sensors of red, green and blue aligned in parallel to each other along a main scan direction. When a document is scanned, a document is read by the photoelectric converter by moving it relative to the document. The moving direction is set to be a first direction, for a prescan and a second direction reverse to the first direction, for a normal scan. Analog output signals of the first to third linear image sensor are converted to digital signals. In a prescan, a selector exchanges the digital signals of the first and third linear image sensors, while in a normal scan, the selector does not exchange them. Then, a line correction section receives the digital signals of the first and third linear image sensors from the selector and the digital signals of the second linear image sensor from the analog-to-digital converter and outputs the digital signals of the first to third linear image sensors by delaying outputs of the digital signals with delay times determined in correspondence to spacial distances between positions of the three linear image sensors and a scan speed along the moving direction. Thus, image data can be read without shifts of output timings of the image data of red, green and blue.
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Hirota Yoshihiko
Suzuki Hiroyuki
Toyama Katsuhisa
Minolta Co. , Ltd.
Vu Kim
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