Image processing apparatus having dither operation function

Details Image processing apparatus having dither operation function Image processing apparatus having dither operation function

1993-09-21

1995-04-25

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

358298, B41J 2435

Patent

active

054103371

ABSTRACT:
The estimated densities of an image input from a line sensor are calculated by density estimating sections, each having a scanning aperture, and multiple circuits. Thereafter, the directions in which the density of the image changes are identified by comparators. An aperture selecting section selects a scanning aperture to be used as a halftone density on the basis of the identification result and the determination result obtained by an image quality determining section, which result indicates whether the input image is a dither image or a binary image. Subsequently, re-dither processing or binarization processing is performed by an image processing section in accordance with the determination result obtained by the image quality determining section.

REFERENCES:
patent: 4758897 (1988-07-01), Hiratsuka et al.
patent: 4772911 (1988-09-01), Sasaki et al.
patent: 4803558 (1989-02-01), Hiratsuka et al.
patent: 4901363 (1990-02-01), Toyokawa
patent: 4914524 (1990-04-01), Kimura

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