Dither processing method

Details Dither processing method Dither processing method

1994-05-23

1995-08-01

Couso, Yon J.

Image analysis

Histogram processing

With a gray-level transformation

382270, 358465, 358457, G06K 938

Patent

active

054386349

ABSTRACT:
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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