Appeal No. 1998-1395
Application No. 08/606,634
BACKGROUND
The invention is directed to a method and apparatus for reducing scanning artifacts
(Moire pattern) in a digital sampling process, particularly for applications in document
scanning and image processing. Representative claim 28 is reproduced below.
28. A method of processing an original halftone image represented by a
set of original grey level pixels so as to generate a set of new grey level pixels
at the same scale as the set of original grey level pixels, the method
comprising:
(a) determining a grey level value for each new grey level pixel as a
function of (i) grey level values of original pixels in a group of plural
neighboring original pixels, and (ii) spacings between said neighboring
original pixels;
(b) replacing an original grey level pixel, forming part of the group of
neighboring original pixels, with the grey level value determined in
accordance with step (a); and
(c) repeating steps (a) and (b) using different groups of plural
neighboring original pixels to generate a set of new grey level pixels that are
at the same scale as the set of original grey level pixels.
The examiner relies on the following references:
Hiratsuka et al. (Hiratsuka) 4,803,558 Feb. 7, 1989
Tutt et al. (Tutt) 4,872,064 Oct. 3, 1989
Claims 22 and 28 stand rejected under 35 U.S.C. § 102 as being anticipated by
Hiratsuka and by Tutt.
Claims 23, 27, and 29 stand rejected under 35 U.S.C. § 103 as being unpatentable
over Hiratsuka or Tutt.
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