Method of establishing halftone dot thresholds, apparatus for ge

Details Method of establishing halftone dot thresholds, apparatus for ge Method of establishing halftone dot thresholds, apparatus for ge

1998-08-18

1999-07-20

Rogers, Scott

Image analysis

Image compression or coding

Gray level to binary coding

382270, 358456, 358457, H04N 1405

Patent

active

059265710

ABSTRACT:
A supercell is divided into halftone dot cells each with a highlight point at center and halftone dot cells each with a shadow point at center. Thresholds 0, 1, 2, 3, . . . assigned to pixels in the halftone dot cells each with a highlight point at center and thresholds N, N-1, N-2, N-3, . . . assigned to pixels in the halftone dot cells each with a shadow point at center are alternately determined, i.e., determined in the order of 0.fwdarw.N.fwdarw.1.fwdarw.N-1.fwdarw., . . . .fwdarw.3.fwdarw.N-3. When the density of an original image is high, the number of blackened pixels in the halftone dot cells each with a highlight point at center and the number of blank pixels in the halftone dot cells each with a shadow point at center are equalized to each other, thus preventing moire stripes from being produced which would otherwise be caused by a periodic change in the number of blackened pixels in the halftone dot cells.

REFERENCES:
patent: 4773736 (1988-09-01), Inoda
patent: 4987498 (1991-01-01), Shimazaki
patent: 5053887 (1991-10-01), Thompson

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