Spot function endtone noise and growth

Details Spot function endtone noise and growth Spot function endtone noise and growth

1993-08-23

1996-06-11

Boudreau, Leo H.

Image analysis

Image compression or coding

Gray level to binary coding

382270, 358457, 358459, G06K 936, G06K 946

Patent

active

055264450

ABSTRACT:
A method of preventing Moire patterns in a halftone image includes creating a digital screen including a collection of cells having pixels with threshold values according to a spot function, and dithering the threshold values corresponding with the endtones while not dithering the midtone gray values. Preferably, the amount of dither increases with the difference between the threshold value of the pixels from the midtones. The growth of the spot due to increasing gray values is controlled such that all cells grow at the same rate at the endtone gray values, and some cells grow at different rates at the midtone gray values.

REFERENCES:
patent: 4916545 (1990-04-01), Granger
patent: 4977458 (1990-12-01), Granger et al.
patent: 5204916 (1993-04-01), Hamilton et al.
patent: 5305118 (1994-04-01), Schiller et al.
patent: 5307181 (1994-04-01), Levien

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