Method and apparatus for detecting banding using moire pattern

Facsimile and static presentation processing – Static presentation processing – Attribute control

Reexamination Certificate

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C358S003210, C358S003240, C358S406000

Reexamination Certificate

active

08085441

ABSTRACT:
A method of determining presence of variations in interline spacing in a first image comprising a first plurality of parallel lines of pixels comprising: providing a second image comprising a second plurality of parallel lines; orienting the images so that the lines in the first and second pluralities are superimposed and angled with respect to each other to generate an interference image comprising a Moiré interference pattern; and using the Moiré interference pattern to determine presence of said variations.

REFERENCES:
patent: 2002/0036783 (2002-03-01), Yoshidome
patent: 2003/0030271 (2003-02-01), Wicker
patent: 2005/0275855 (2005-12-01), Mizes et al.
Beyer et al, “Method of testing line-grating 'for use in moire-fringe metrology!”, Jenaer Jahrbuch Germany, 1963, pp. 67-75.
“Andrew Glassner's notebook”, Glassner, A., IEEE Computer Graphics and Applications, vol. 24, No. 1, Jan. 2004, pp. 86-91.
“Measuring the line spacing and density of high-resolution images from capstan and drum output scanners”, Macdonald, R., Proc. SPIE, Color Hard Copy and Graphic Arts IV, Jan Bares, vol. 2413, Apr. 1995, pp. 284-292.
“Einsatz Der Moire-Technik Zur Fehlererkennung An Textilen Fiaechengebilden”, Wefers et al. Textil Praxis International, Konradin Verlag R. Kohlhammer GMBH, LeinFelden, DE, 1992, pp. 834-840.
PCT International Search Report mailed May 4, 2005, from counterpart PCT Application No. PCT/IL2004/000609.

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