Patent ID: 7881371
Filing Date: 2011-02-01
Classification: G06F,H04N

Abstract:
1. A method for decoding video or image information, the method comprising: at a computing device that implements a decoder, receiving a set of quantized transform coefficients; with the computing device, de-quantizing the quantized transform coefficients into de-quantized transform coefficients, wherein the quantized transform coefficients are logically arranged in a block, and wherein for each of the quantized transform coefficients the de-quantizing includes: with the computing device, applying an inverse transform process to the de-quantized transform coefficients to generate reconstructed information therefrom, the inverse transform process applying inverse transformation calculations having values such that each multiplication operation in the inverse transformation calculations can be performed by a shift operation, wherein the inverse transform process is orthogonal, the values of the inverse transformation calculations are based on values represented in an inverse transform matrix with plural columns having different norms, the inverse transform process is a two-dimensional inverse transform with row and column inverse transforms, the two-dimensional inverse transform having different norms, and wherein the de-quantizing uses the selection from among the plural groups of scaling factors to at least in part adjust for the different norms of the-two-dimensional inverse transform.