System and method for converting continuous half tone image into

Details System and method for converting continuous half tone image into System and method for converting continuous half tone image into

1991-08-26

1993-04-20

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, 358457, H04N 514

Patent

active

052047601

ABSTRACT:
In processing of a minimizer average error method (or an error diffusion method), a threshold value for determining whether a point (pixel) as an object to be processed is a black or white dot is changed in accordance with the pixel position using a threshold value matrix having a two-dimensional repetitive pattern. When a one-dot size in an output apparatus which can only perform binary expression in units of pixels is larger than a logical size, a continuous tone image is converted into a pseudo half tone image in consideration of an increase in size of a dot into other dots (projecting portions).

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5 J. F. Jarvis et al., Computer Graphics and Image Processing, "A Survey of Techniques for the Display of Continuos Tone Pictures on Bilevel Displays" pp. 13-18 and 36-40 (1976).
"High Speed Bi-Level Image Processor of MED", pp. 43-46 by Yuji Maruyama, et al., Dec. 7, 1988.

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