Apparatus for representing continuous tone and high contrast ima

Details Apparatus for representing continuous tone and high contrast ima Apparatus for representing continuous tone and high contrast ima

1988-10-24

1991-02-12

Harkcom, Gary V.

Boots, shoes, and leggings

358465, 358456, 382 50, G06F 1566, G06F 314, H04N 140

Patent

active

049929550

ABSTRACT:
A half tone display apparatus using a display apparatus of bilevel representation in white and black is provided. The apparatus includes a unit supplied with a multilevel image such as a color image, a device for detecting edges in characters, patterns and photographic images, a unit for deriving a level difference between pixels adjacent to the edge, and a control unit for forcibly displaying a pixel of the edge portion as a white or black pixel for emphasis provided that the level difference is not larger than a predetermined threshold and for applying dither conversion to other pixels.

REFERENCES:
patent: 4246614 (1981-01-01), Knox
patent: 4554593 (1985-11-01), Fox et al.
patent: 4577235 (1986-03-01), Kannapell et al.
patent: 4686579 (1987-08-01), Sakamoto
patent: 4737859 (1988-04-01), Van Daele
patent: 4783832 (1988-11-01), Kaneko
patent: 4797943 (1989-01-01), Murayama et al.
Jarvis et al., "A Survey of Techniques for the Display of Continuous Tone Pictures on Bilevel Displays", Computer Graphics and Image Processing 5, 1976, pp. 13-40.

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