Appeal No. 1998-1895 Page 3
Application No. 08/425,990
the high-frequency images from the edge images enables high
compression, without recourse to extensive computation.
Claim 1, which is representative for our purposes,
follows:
1. A method of encoding and decoding a
digitized image consisting of pixel values,
comprising the steps of:
detecting sharpness of edges in said digitized
image;
encoding position and sharpness values of edge
points having sharpness values exceeding a certain
threshold, thereby generating edge information;
filtering said digitized image by a low-pass
filter, thereby generating a low-frequency image;
encoding said low-frequency image, thereby
generating low-frequency information;
sending said edge information and said low-
frequency information to an input/output device;
receiving said edge information and said low-
frequency information from said input/output device;
generating a horizontal edge image and a
vertical edge image from said edge information;
synthesizing a pair of high-frequency images by
filtering said horizontal edge image and said
vertical edge image with an edge synthesis filter;
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