Mixed screen frequencies with image segmentation

Details Mixed screen frequencies with image segmentation Mixed screen frequencies with image segmentation

1992-04-30

1995-11-28

Boudreau, Leo H.

Image analysis

Image segmentation

358456, G06K 900

Patent

active

054715431

ABSTRACT:
Apparatus for producing a screen halftone image provides for segmentation of images by optical density, busyness, segment size, and/or propensity to contouring; and for printing the segments which have high optical density, are more busy, and/or have a lesser propensity to contouring at a relatively high screen frequency; and for printing segments which have low optical density, are less busy, and/or have a greater propensity to contouring at a relatively low screen frequency. Both screen frequencies are printed at the same apparent screen angle to reduce texturing. Small segments are assigned the same screen frequency as the surrounding segment.

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patent: 4809063 (1989-02-01), Moriguchi et al.
patent: 4942479 (1990-07-01), Kanno
Dana Ballard and Christopher Brown, Computer Vision, Prentice Hall, 1982, pp. 116-117, 149-165.

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