Patent ID: 6034667
Filing Date: 2000-03-07
Classification: G09G

Abstract:
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; anda 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 table means includes storage locations, each of the storage locations stores a pair of color index values which map to horizontally contiguous pixels of the raster scan video display, and each said color index pair consists of one said pair of color index values.