Image processing apparatus

Details Image processing apparatus Image processing apparatus

1986-11-10

1988-01-05

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358298, H04N 140

Patent

active

047179643

ABSTRACT:
The present invention is to provide an image processing apparatus having structure for forming a halftone image in such manner that, on a multicoded image consisting of regions differing in density formed by multicoding by using a prescribed threshold value matrix, a plurality of differing scanning unit areas are brought each to the multicoded image for each pixel in a successive manner so as to obtain values based on the ratios between the regions differing in density of the multicoded image within the unit areas, then density patterns are obtained from the above value by using the threshold value matrix, and then the halftone image is made by comparing the density patterns with the multicoded image within the unit areas, and the image processing apparatus further has structure for making the position of the threshold value matrix used for obtaining the multicoded image coincide with the position of the threshold value matrix used for obtaining the density pattern.

REFERENCES:
patent: 4633327 (1986-12-01), Roetling
patent: 4651287 (1987-03-01), Tsao

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