Image processing method and image processing apparatus

Details Image processing method and image processing apparatus Image processing method and image processing apparatus

1996-10-07

1998-05-05

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 358456, 358521, 382237, 382252, H04N 140, G06K 936, G06K 938, G06K 946

Patent

active

057483361

ABSTRACT:
An image processing method for converting multi-gradation image data into two-gradation image data by employing an error diffusion method, the image processing method comprises the steps of: (1) adding a diffusion error derived from at least one pixel which has already been binary-coded and is located near a pixel of interest to multi-gradation image data of this pixel of interest to thereby obtain corrected data; (2) comparing the corrected data with a threshold value and converting the corrected data into two-gradation image data for indicating any one of a dot ON and a dot OFF; (3) calculating a quantizing error corresponding to a difference between the corrected data and a first evaluation value corresponding to the two-gradation image data; (4) diffusing the quantizing error to a plurality of pixels which have not yet been binary-coded and are located near the pixel of interest; and (5) varying the first evaluation value corresponding to the two-gradation image data indicative of the dot ON in accordance with the multi-gradation image data of the pixel of interest.

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patent: 5168373 (1992-12-01), Nakamura
patent: 5226096 (1993-07-01), Fan
patent: 5321525 (1994-06-01), Hains
patent: 5488673 (1996-01-01), Katayama et al.
patent: 5515180 (1996-05-01), Maeda et al.
patent: 5523861 (1996-06-01), Tanaka et al.

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