Dither processing method

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United States of America Patent

PATENT NO 5438634
SERIAL NO

08247397

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Abstract

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A dither processing method generates a binary-value image from an original image. The original image is converted to a binary-value image by a dither process. For each area in the dither image that corresponds to a dither cell, a representative density is calculated from the number of black (or white) pixels produced by the dither process. A median value of representative densities is then used as a threshold, and the original image is converted to a binary-value image using the threshold. By using the median of representative values, lighting of the original image is corrected.

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Patent Owner(s)

Patent OwnerAddress
YOZAN INCTOKYO 155-0031

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kumagai, Ryohei Tokyo, JP 52 894

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