Error sum method and apparatus for intercolor separation control

Details Error sum method and apparatus for intercolor separation control Error sum method and apparatus for intercolor separation control

1996-09-26

1998-07-21

Rogers, Scott

Image analysis

Image compression or coding

Gray level to binary coding

382252, 382270, 358534, 358456, 358466, G06T 500, H04N 1405, H04N 152

Patent

active

057844968

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 a plurality of error signals, each of the plurality of error signals being derived by processing previous ones of pixels in each 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 for the current one of the plurality of input pixels, 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
patent: 5565994 (1996-10-01), Eschbach
Knox, Keith T. and Echbach Reiner, "Threshold Modulation in Error Diffusion", Journal of Electronic Imaging, Jul. 1993, pp. 185-192.

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