Patent ID: 7688894

Claim:
A method for transforming encoded video information using a computing device that implements a video decoder, the method comprising: with the computing device that implements the video decoder: entropy decoding transform coefficients in a one-dimensional array; scanning the transform coefficients from the one-dimensional array into a two-dimensional block according to a scan pattern, wherein the block is 4 coefficients in a horizontal direction by 8 coefficients in a vertical direction, wherein the scan pattern is for interlaced video, wherein the scan pattern biases the horizontal direction for the lowest frequency AC coefficients in the horizontal and vertical directions but biases the vertical direction for at least some other AC coefficients, and wherein scan pattern is: 0 1 2 9 3 5 8 22 4 7 15 24 6 14 17 26 10 16 19 28 11 18 23 29 12 20 25 30 13 21 27 31; and processing results of the scanning, wherein the processing includes performing an inverse frequency transform on the two-dimensional block of transform coefficients.