Method for generating halftone image data with randomly selected

Details Method for generating halftone image data with randomly selected Method for generating halftone image data with randomly selected

1991-04-01

1992-09-22

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358455, 358465, 358466, G06K 938

Patent

active

051504286

ABSTRACT:
In the present invention each input pixel value is compared against a randomly selected threshold value to provide an output pixel having a value indicative of which of the values is greater. The threshold value is selected from one of a plurality of threshold matrices, each having a predetermined number of threshold values that are arranged in a pattern with the values for a base matrix being increased by an increment for each succeeding one of the plurality of threshold matrices. The selection of the one threshold matrix is made by means of a pseudo-random number generator.

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