Patent ID: 6529244
Filing Date: 2003-03-04
Classification: H04N

Abstract:
A sub-system for a digital video system, said sub-system comprising:memory for receiving a graphics bitmap in 4:4:4 format, said graphics bitmap comprising a plurality of picture elements; and an on-screen display processor coupled to said memory for converting said graphics bitmap in 4:4:4 format to graphics image words in 4:2:2 format, wherein at least one graphics image word has a blended chrominance value obtained by merging chrominance values of at least two adjacent picture elements of said graphics bitmap, said blended chrominance value being obtained by mathematically combining corresponding chrominance values of said at least two picture elements merged to obtain said blended chrominance value, wherein said mathematically combining comprises logic for averaging said chrominance values of said at least two picture elements to obtain said blended chrominance value, said logic for averaging comprising logic for averaging U chrominances of said at least two picture elements to obtain a blended U chrominance, and for averaging V chrominances of the at least two picture elements to obtain a blended V chrominance.