System and method for a robust de-screening filter

Details System and method for a robust de-screening filter System and method for a robust de-screening filter

2007-03-06

2007-03-06

Lee, Thomas D. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003070

Reexamination Certificate

active

09675265

ABSTRACT:
A method and apparatus for de-screening a halftone image, therefore allowing the recovery of an approximation of an original image, is disclosed. A method according to one embodiment first performs a screen conversion filter upon a scanned representation of the halftone image to produce an intermediate image. This method then performs a line smoothing filter upon the intermediate image to produce an approximation to the original image.In an alternate embodiment, the method performs a single convolution filter upon a scanned representation of the halftone image to produce an approximation to the original image. In this embodiment, the single convolution filter is equal to the resulting convolution of first performing a screen conversion filter and then performing a line smoothing filter.

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“Elementary Digital Filter Theory,” Adapted from “Techniques for Digital Filter Design and System Identification . . . ” J.O. Smith Ph.D. Dissertation, Dept of EE, Stanford University, Jun. 1983, 20 pgs.
“Color Technology for Electronic Imaging Devices,” Henry Kang, SPIE Press, Mar. 1997, 5 pgs.
“Convolution Filtering,” in Sun Microsystems Programming in Advanced Imaging, Ch.apter 7.7, Jul. 1999, 12 pgs.

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