Phantom level edge enhanced error diffusion

Details Phantom level edge enhanced error diffusion Phantom level edge enhanced error diffusion

1996-06-27

1998-11-10

Vu, Kim Yen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 382252, 382266, H04N 140, G06K 940

Patent

active

058352384

ABSTRACT:
A method and apparatus for converting an input image including a plurality of input pixels each having a number of possible input levels of optical density to an output image including a plurality of output pixels each having a number of possible output levels of optical density using phantom output levels in an error diffusion technique, an automatic image enhancement technique, or other printing methods and apparatus where errors are fed back to alter an input image. The method includes generating a modified optical density value by adding an error value, if any, to the input level of one of the input pixels, generating a phantom output level as a function of the modified optical density level, determining the error value as a function of the selected phantom output level; and generating an output pixel having one of the output levels determined as a function of the modified optical density value.

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Kim, Jae Ho, et al., "New edge-enhanced error diffusion algorithm based on the error sum criterion", Journal of Electronic Imaging, Apr. 1995, vol. 4(2), pp. 172-178.

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