Image processing method and printer

Details Image processing method and printer Image processing method and printer

1998-10-14

2000-02-01

Grant, II, Jerome

Image analysis

Histogram processing

With a gray-level transformation

358456, 358457, 358466, 382270, G06K 900, G06K 938, H04N 140

Patent

active

060212179

ABSTRACT:
In case of subjecting input graduation image data of 8 bits per pixel to multilevel dither processing, to convert them into image data having gradients of 3 bits per pixel on the basis of dither threshold planes, in a combination of threshold arrays extending over the plural dither threshold planes, dither thresholds for raising spatial fre0 quency, as shown in FIG. 8A, are arranged in low density areas of the input graduation image data, and dither thresholds for making spatial frequency lower than that in the low density areas, as shown in FIG. 8C, are arranged in half tone areas and high density areas of the input graduation image data.

REFERENCES:
patent: 5315669 (1994-05-01), Kumagai
patent: 5422742 (1995-06-01), Ostromoukhov et al.
patent: 5444551 (1995-08-01), Miller et al.
patent: 5715081 (1998-02-01), Chastang et al.

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