Translation of an input pixel value to an output pixel value

Details Translation of an input pixel value to an output pixel value Translation of an input pixel value to an output pixel value

2007-11-27

2007-11-27

Lee, Thomas D. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003060

Reexamination Certificate

active

10284955

ABSTRACT:
A device to translate an input pixel value to an output pixel value for a current pixel includes a diffusion block to produce a diffusion error to add to the input pixel value to produce a diffused pixel value. In addition, the device includes a feedback modulation block to generate a threshold value, the threshold value determined using a value of an earlier output pixel value, the earlier output pixel value occurring at a predetermined number of pixels prior to the current pixel. Furthermore, the device includes a quantizer to compare the diffused pixel value to the threshold value and based on the comparison to select a value for the output pixel value.

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P. Li and J. P. Allebach,Tone Dependent Error Diffusion, Color Imaging: Device Independent Color, Color Hardcopy, and Applications VII, R. Eschbach and G. G. Marcu, eds, SPIE vol. 4663, San Jose, CA Jan. 22-25, 2002, pp. 310-321.

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