Photographic image reproduction device using digital halftoning

Details Photographic image reproduction device using digital halftoning Photographic image reproduction device using digital halftoning

1990-02-06

1991-10-08

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358459, 358298, H04N 123, H04N 140

Patent

active

050559427

ABSTRACT:
In the generation of screened halftones of photographic images for low resolution marking devices, conventional screen techniques are too coarse, and adaptive dither techniques are too fine. The present invention preserves the advantages of the adaptive dither techniques, while creating screen patterns with an adjustable degree of coarseness. The invention applies a hysteresis constant and recursion techniques previously limited to adaptive screening with fixed dot patterns to vary the size of dots in the screened image, thereby allowing adjustment of the image coarseness by adjusting the hysteresis constant.

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An Adaptive Algorithm for Spatial Greyscale, Robert W. Floyd et al., Floyd and Steinberg/An Adaptive Algorithm for Spatial Greyscale, pp. 75-77.
Digital Halftoning, Robert Ulichney, The MIT Press, Cambridge, Mass., London, England-Error Diffusion with Perturbation, pp. 279-283.

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