Patent ID: 7684489
Filing Date: 2010-03-23
Classification: H04N

Abstract:
1. A method of video coding comprising: transforming, with an encoding device, a first m×n macro block of residual chrominance pixel values of moving pictures, of a 4:2:2 format or a 4:4:4 format, by a first integer-transform function, thereby generating a corresponding second m×n macro block of integer-transform coefficients, the transforming including generating the second m×n macro block of integer-transform coefficients by utilizing a 4×4 integer-transform function on each 4×4 sub-blocks of the first m×n macro block, wherein each of n and m is a multiple of 4; and transforming, with the encoding device, DC values of the integer-transform coefficients by a second integer-transform function, thereby generating a third block of integer-transformed DC coefficients, the transforming including generating the third block of coefficients by utilizing i×j integer-transform function, wherein i=m/4 and j=n/4, on the DC values resulting in a (m/4)×(n/4) third block of integer-transformed DC coefficients.