Image processing apparatus

Details Image processing apparatus Image processing apparatus

1984-08-27

1987-11-24

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 358284, 358282, 382 50, 382 53, H04N 140

Patent

active

047092742

ABSTRACT:
An image processing apparatus has a slice binarizing circuit, a dither process circuit, maximum and minimum density measuring circuits, a comparator for determining if each image area is a binary or halftone image area, and a RAM for storing an output from the comparator. An average value of the difference between the maximum and minimum densities can be calculated, and outputs from the slice binarizing circuit and the dither process circuit can be ANDed or ORed in accordance with a comparison result of the average value with a reference value. An image density gradient or image tone data in an image block can also be calculated to allow multi-level quantization and optimal image reproduction.

REFERENCES:
patent: 4194221 (1980-03-01), Stoffel
patent: 4414581 (1983-11-01), Kato et al.
patent: 4495522 (1985-01-01), Matsunawa et al.
patent: 4525747 (1985-06-01), Sakai et al.

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