Image processing apparatus

Details Image processing apparatus Image processing apparatus

1986-07-01

1988-11-08

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358282, 358283, G06K 900

Patent

active

047838370

ABSTRACT:
An image processing apparatus comprises an input device for inputting an image data, a first converter circuit for converting the input image signal to an analog image output and a second converter circuit for converting the input image data to a digital image output. The first converter circuit controls the analog image output in accordance with the output of the second converter circuit. The second converter circuit produces different digital signals in accordance with the input image data and has a threshold matrix to be compared with the input image data.

REFERENCES:
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patent: 3742129 (1973-06-01), Roberts et al.
patent: 3878559 (1975-04-01), Pugsley
patent: 4196451 (1980-04-01), Pellar
patent: 4251837 (1981-02-01), Janeway, III
patent: 4430748 (1984-02-01), Tuhro et al.
patent: 4486788 (1984-12-01), Yamada
patent: 4496987 (1985-01-01), Yuasa et al.
patent: 4507685 (1985-03-01), Kawamura
patent: 4547811 (1985-10-01), Ochi et al.
"Electronic Halftoning for Color Reproduction", P. Stucki, IBM Technical Disclosure Bulletin, vol. 20, No. 6, Nov. 1977, pp. 2423-2425.

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