Adequate quantisation in multilevel halftoning

Details Adequate quantisation in multilevel halftoning Adequate quantisation in multilevel halftoning

2007-01-30

2007-01-30

Lee, Thomas D. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003030, C358S003060, C382S252000

Reexamination Certificate

active

10080143

ABSTRACT:
The method reproduces an electronic image, having pixels, as a multilevel halftone image on a multilevel output device having N different allowed output values (possible density levels) bychoosing for any pixel p a real subset Spcontaining Npallowed values out of the set S of N allowed levelsquantizing the input pixel value of the pixel p to obtain an output pixel value out of the Npvalues in Spby means of a half toning algorithm,rendering the image by rendering the pixels with the output device using the obtained output pixel values.The real subset may be formed by the allowed output values closest to the input pixel value. The quantization may be done by an error diffusion algorithm The used method prevents occurrence of pixels having deviating densities distorting the output image.

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European Search Report, EP 01 00 0052, Aug. 2001.

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