Method of determining threshold array for generating...

Details Method of determining threshold array for generating... Method of determining threshold array for generating...

2007-01-02

2007-01-02

Rogers, Scott A. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003200, C358S003260, C382S270000

Reexamination Certificate

active

10166164

ABSTRACT:
Halftone image data is generated according to a threshold array in which thresholds T up to a given gradation have been determined, and candidate pixels to be blackened are then determined. Then, a low-frequency component extractor extracts low-frequency component data from density image data which simulates the density of the halftone image data corresponding to an output image from an image output apparatus. A particular frequency component divider70divides the extracted low-frequency component data into particular frequency component data for intensifying the low-frequency components, and blackening candidate pixels for intensifying the particular frequency components are excluded, thus narrowing down candidate pixels. The positions of thus determined blackening candidate pixels are determined as the positions of thresholds for a next gradation.

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“Postscript screening” written by Peter Fink, published by MDN corporation on Aug. 11, 1994, 1stedition.

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