Digital halftone rendering of a gray scale image with frequency-

Details Digital halftone rendering of a gray scale image with frequency- Digital halftone rendering of a gray scale image with frequency-

1996-03-07

1998-06-02

Boudreau, Leo

Image analysis

Applications

382237, G06K 900

Patent

active

057613257

ABSTRACT:
A method of halftoning a digital gray scale image is disclosed that utilizes a point by point thresholding comparison to a novel diagonal correlation dither matrix. The new dither matrix forces diagonal correlation of adjacent dots in the output image while maximizing dispersion of dots, thereby producing visually unobtrusive output dot patterns. The matrix is generated according to a spatial domain cost function that determines a cost value for each candidate pixel based on respective radial distances and relative angles between a candidate pixel and the ON pixels in the matrix such that unit diagonals are favored over placement of vertically or horizontally adjacent dots.

REFERENCES:
Gonzalez et al., "Digital Image Processing" 1992, pp. 663-664.

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