Image processor with smooth transitioning between dither and dif

Details Image processor with smooth transitioning between dither and dif Image processor with smooth transitioning between dither and dif

1988-07-21

1991-05-07

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

358443, 358466, G06K 940

Patent

active

050143336

ABSTRACT:
An image processor converts a multiple gray-level image to a bi-tonal image using both error diffusion and ordered dither to enhance image quality. The error diffusion process is attenuated smoothly as the local area intensity approaches a light or dark maximum, while the ordered dither process is attenuated smoothly as the local area high spatial frequency content increases.

REFERENCES:
patent: 4339774 (1982-07-01), Temple
patent: 4876610 (1989-10-01), Nuter et al.
patent: 4878125 (1989-10-01), Katayama et al.
Stoffel et al., "A survay of Electronic Techniques for Pictorial Image Reproduction", IEEE Trans of Comm., vol. COM-29, #12, Dec. 1981, pp. 1898-1925.
Fox et al., "Multiple Trans Correction Algorithm for Halftone, Continuous Tone and Text Reproduction", IBM Tech. Disc. Bulletin, vol. 23, #10, Mar. 1981, pp. 4433-4435.

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