Appeal No. 1996-0485 Page 3
Application No. 08/139,456
converters transform the RGB pixel signals into analog red,
green, and blue video signals, which display an image
specified by the contents of the frame buffer on the raster
scan display.
Claim 1, which is representative for our purposes,
follows:
1. An apparatus for converting input image
data specified in a YUV format into display image
data specified as color index values which are
mapped through an RGB color palette for display on a
raster scan video display, where the input image
data are sequentially received input pixels, each of
said input pixels including Y component bits, U
component bits, and V component bits, said apparatus
comprising:
means for adding noise to at least one of the Y
component bits, the U component bits, and the V
component bits of each of the input pixels, thereby
generating a dithered input pixel comprising a first
number of bits for said each of the input pixels;
a means for quantizing each said dithered input
pixel to generate a mapping look-up table index
comprising a second number of bits, where the second
number is less than the first number; and
a mapping look-up table means for receiving each
said mapping look-up table index and outputting a
color index pair in response to each said mapping
look-up table index, wherein the mapping look-up
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