Appeal No. 1996-0485 Page 2
Application No. 08/139,456
BACKGROUND
The invention at issue in this appeal displays a color
image stored in a YUV color format on a raster scan display
that generates video in a red, green, and blue (RGB) format.
It begins by dithering, i.e., adding noise to, the Y, U, and V
component bits of input image data to reduce the banding that
will be caused by quantization. Next, the dithered data are
quantized so that they are described with fewer bits.
The bits are then concatenated and used as an index into
a color space mapping table. The mapping table converts the
bits into color indices, which it outputs to a frame buffer.
The buffer contains data used to display each pixel on the
raster scan display. It is continuously read to generate
values, each of which specifies a color index for one pixel of
the display. Each color index is entered into a color look-up
table, which outputs an RGB pixel signal. Digital-to-analog
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