Image processing system for processing a multi-tone-level image

Details Image processing system for processing a multi-tone-level image Image processing system for processing a multi-tone-level image

1997-04-01

2000-05-16

Boudreau, Leo H.

Image analysis

Image compression or coding

Gray level to binary coding

382172, 382270, 382254, 258462, 258464, G06K 936

Patent

active

060647736

ABSTRACT:
A multi-tone-level image is converted into an M-tone-level image using M-1 threshold values, where M-1.gtoreq.2. Middle-tone-level pixels in the M-tone-level image are treated as unknown pixels, tone levels other than the middle tone levels are given to the unknown pixels based on the states of pixels in the neighborhood of the unknown pixels, and thus produces an N-tone-level image, where M>N.gtoreq.2. Two threshold values of the M-1 threshold values are used for determine the middle-tone-level pixels, the two threshold values corresponding to the lightest tone level of a first image region and the darkest tone level of a second image region respectively. The first image region has tone levels which are darker than the middle tone levels and the second image region has tone levels which are lighter than the middle tone levels.

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Nina Billawala, et al., "Image Continuation", IEEE, Jul. 1993, pp. 53-57.
Nobuyuki Otsu, "An Automatic Threshold Selection Method Based on Discriminant and Least Squares Criteria", Electrotechnical Laboratory, vol. J63-D, No. 4, 1980, pp. 349-356.
J. Kittler, et al., "Minimum Error Thresholding", 1986, pp. 41-47.

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