Patent ID: 7778327

Claim:
A method of video encoding, comprising the steps of: (a) transforming, using a processor, a 4×4 block of integer data into a 4×4 block of integer transform coefficients; and (b) quantizing, using a processor, said 4×4 block of integer transform coefficients by (i) element-by-element multiplication of absolute values of said coefficients with entries of one of a plurality of 4×4 positive integer quantization matrices, (ii) addition of a rounding control parameter, (iii) restoration of the signs of said coefficients, (iv) and right shifting; (c) wherein a first matrix of said plurality of 4×4 positive integer quantization matrices has entries which are equal to one-half with round-off of corresponding entries of a second matrix of said plurality of 4×4 positive integer quantization matrices; and (d) said one of said plurality of 4×4 positive integer quantization matrices is selected according to a quantization parameter.