Reduction of banding in printed images

Details Reduction of banding in printed images Reduction of banding in printed images

1998-12-18

2000-02-15

Grant, II, Jerome

Facsimile and static presentation processing

Static presentation processing

Detail of image placement or content

358 16, G06F 1500

Patent

active

060259221

ABSTRACT:
A method and apparatus is provided for adding pseudo-random noise and bias to an input pixel value to reduce banding effects and to produce additional highlights in the output. The method adds the value of a bias function and a pseudo-random noise value to the input pixel value. The sum is shifted a predetermined number of spaces. The result of the shifting step is then added to the input pixel value. A predetermined constant is subtracted from the above sum. A clipping procedure is then applied to calculate the final output value. Three properties of the bias function are to have a value of no ink map to a value of no ink, to have a value of full ink map to a value of full ink, and to add highlights.

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