Image processing apparatus for half-tone processing and reproduc

Details Image processing apparatus for half-tone processing and reproduc Image processing apparatus for half-tone processing and reproduc

1993-03-30

1995-06-13

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, 358462, 358466, 358467, H04N 140

Patent

active

054248540

ABSTRACT:
An image processing apparatus for half-tone processing input image data having different resolutions by using a dither matrix consisting of a plurality of threshold values is disclosed. The apparatus includes an input device to input image data; a high-resolution dither processing unit to half-tone process the image data of a high resolution; a low-resolution dither processing unit to half-tone process the image data of a low resolution; and a selector to select either one of the two processing units in accordance with the resolution of the input image data. The input device includes a reader to read an original image and generate image data and a resolution conversion processing unit to convert the resolution of the image data obtained by the reader. The high-resolution processing unit uses a spiral-type dither matrix. The low-resolution processing unit uses a dither matrix including a plurality of small spiral-type dither matrices. The input images of different resolutions can be accurately reproduced.

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patent: 5014124 (1991-05-01), Fujisawa
patent: 5175635 (1993-12-01), Yamada et al.
patent: 5218457 (1993-06-01), Burkhardt et al.

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