Patent ID: 7627187

Claim:
A decoding method including: computer implemented steps performed by a processor of a computer system to implement the following steps: receiving a block of coefficients relating to a block of video information to be displayed which has been transformed and quantized for compression of the video information: providing a single, one dimensional look-up table (LUT) which consists of a single group of scaling factors applicable for scaling of coefficients of different block sizes; computing an index for each coefficient, the index being a function of a quantization parameter, a size of the block of coefficients, and a position of said each coefficient within the block; indexing the LUT, using the computed index, to determine a scaling factor in the LUT applicable for scaling of said each coefficient; scaling the block of received coefficients, using the determined scaling factors, to inversely quantize the block of received coefficients; and applying a vertical transform and a horizontal transform to the block of scaled coefficients in order to reconstruct a signal of the block video information for display of the video signal, where basis vectors of the vertical and horizontal transform are 1 1 1 1 5/4 ½ −½ − 5/4 1 −1 1 −1 ½ − 5/4 5/4 −½ or transpose thereof.