Computational moiré compensation

Details Computational moiré compensation Computational moiré compensation

2008-03-11

2008-03-11

Poon, King Y. (Department: 2625)

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

C358S003060, C358S003040, C358S003200, C358S003260, C358S001900, C358S406000, C358S528000, C358S466000, C358S451000, C358S448000, C358S003070, C382S270000, C382S271000, C382S298000, C382S266000, C382S263000

Reexamination Certificate

active

10646803

ABSTRACT:
The amount of moiré in halftone printed images is reduced using unique moiré intensity functions and moiré vectors in a halftoner. In various embodiments, moiré phase angle zones are determined over the full field of an image and high addressability units in the full-field moiré phase angle zones of the image are adjusted, including in an iterative manner, until they significantly reduce the moiré. A useful relationship between halftoner memory locations and moiré phase angle zones in a full field image is determined. The moiré that occurs in a halftone image is quantified and moiré compensation values obtained are then used to generate an inverse moire amount which is used to compensate for the moiré.

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patent: 6449346 (2002-09-01), Katz
patent: 6522425 (2003-02-01), Yoshidome

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