Appeal No. 2003-1842 Page 2
Application No. 09/179,290
that indicates, for each pixel, the group to which the pixel belongs. Upon
decompression, each pixel is shown with the color of the pixel selected for the group to
which the pixel belongs. (Id., abs.)
A further understanding of the invention can be achieved by reading the following
claim.
2. A method of generating image values of an output image, the
method comprising the steps of
- defining a subdivision of the output image into regions of image
locations,
- providing a color look-up table,
- providing a respective set of references to the color look-up table
for each region,
- providing a pixel map comprising a selection code for each image
location,
- selecting a particular reference to the color look-up table for a
particular image location from the particular set provided for the region to
which the particular image location belongs, by using the selection code
as a pointer in that particular set,
- wherein the pixel map is constructed by grouping the image
locations in each region into groups according to a similarity of color
values in source image, the selection code identifying the group to which
the image location belongs among the groups for the region,
wherein the color look-up table is provided for the source image, all
color values of the source image being in the color look-up table, the
reference used for the image locations in a particular group of the pixel
map being constructed from at least one reference to the color look-up
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