Error-diffusion-type half-toning employing adaptive thresholding

Details Error-diffusion-type half-toning employing adaptive thresholding Error-diffusion-type half-toning employing adaptive thresholding

1996-07-12

1998-04-14

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358466, 358518, 358534, 382239, 382252, H04N 140, H04N 146, G03F 308, G06K 936

Patent

active

057399174

ABSTRACT:
A printer driver for a color printer employs an error-diffusion-type half-toning process in which different quantization thresholds are employed for different ones of the color components. The color component whose value is highest after augmentation by accumulated error is compared with a relatively low threshold to determine the binary output value for that component. The lowest error-augmented component value is compared with a relatively high quantization threshold, and the component whose value is between those of the other two is compared with an intermediate-valued quantization threshold. Varying the thresholds in this manner tends to discourage coincidences of different-colored imaging agents at the same pixels and thus tends to result in light colors' having a smoother appearance.

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