Appeal No. 1996-0485 Page 15
Application No. 08/139,456
values to the Y component to obtain better image
appearance. (Examiner’s Answer at 10.)
We cannot find that the references teach or would have
suggested the method for generating a mapping look-up
table of claim 22. The claim recites the following
limitations:
A method for generating a mapping look-up table
for use in converting image data specified in a YUV
format into display image data specified in a RGB
format for display on a raster scan video display,
said method including the steps of:
determining a luminance value Y" and chrominance
values U" and V" for each RGB value of an RGB color
palette for the display image data;
generating an expanded YUV value, comprising
bits Y', U', and V', for each mapping look-up table
index of a set of mapping look-up table indices; and
selecting as a first color palette index for
said each mapping look-up table index, an index to
the RGB value which corresponds to values Y ", U ",m m
and V ", wherein the values Y ", U ", and V " arem m m m
determined by minimizing an error value E over all
values Y", U", and V", to determine a minimum error
E , where E is substantially equal to LA + MB + NC,
m
where L, M, and N are weighting factors, A is the
absolute value of Y" -Y', B is the absolute value of
U" - U', C is the absolute value of V" - V', E = LAm m
+ MB + NC , where A is the absolute value of Y " -m m m m
Y', B is the absolute value of U " - U', and C ism m m
the absolute value of V " - V'.
m
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