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

1994-11-28

1996-06-11

Boudreau, Leo

Image analysis

Image compression or coding

Gray level to binary coding

382254, 382270, 358457, 358459, G06K 936, G06K 946

Patent

active

055264387

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:
patent: 4920501 (1990-04-01), Sullivan et al.
patent: 5107349 (1992-04-01), Ng et al.
patent: 5111310 (1992-05-01), Parker et al.
patent: 5124803 (1992-06-01), Troxel

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