Inter-separation color image processing using error diffusion

Details Inter-separation color image processing using error diffusion Inter-separation color image processing using error diffusion

1996-09-26

1998-05-05

Rogers, Scott

Image analysis

Image compression or coding

Gray level to binary coding

382270, 382252, 358534, 358466, G06T 500, H04N 1405, H04N 152

Patent

active

057487855

ABSTRACT:
A method for processing an input image including a plurality of input pixels each having a first number of possible input levels of optical density to form an output image including a plurality of separations each including a plurality of output pixels each having a second number of possible output levels of optical density. The method includes the steps of generating a first threshold reference signal as a function of the output levels of optical density of a plurality of corresponding pixels each being selected from one of the plurality of separations, modifying a current one of the plurality of input pixels in a current one of the plurality of separations in accordance with an error signal derived by processing previous ones of pixels in the current one of the plurality of separations, generating a second threshold reference signal according to the output levels of optical density of previously processed pixels in the current one of the plurality of separations, and forming one of the output pixels by comparing the modified current one of the plurality of input pixels to the generated first threshold reference signal and the generated second threshold reference signal.

REFERENCES:
patent: 5045952 (1991-09-01), Eschbach
patent: 5353127 (1994-10-01), Shiau et al.
patent: 5375002 (1994-12-01), Kim et al.
patent: 5434672 (1995-07-01), McGuire
patent: 5535019 (1996-07-01), Eschbach
Knox, Keith T. and Eschbach, Reiner, Threshold Modulation in Error Diffusion, Journal of Electronic Imaging, Jul. 1993, pp. 185-192.

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