Patent ID: 6385242
Filing Date: 2002-05-07
Classification: H04N

Abstract:
A method for inverse quantization of coefficients comprising the steps of:providing a two-dimensional array of quantized coefficients QF[v][u] to be inverse quantized; said coefficient representing video macroblocks pre-computing and storing a first weighting matrix {overscore (W)}[0][v][u]=2*W[0][v][u] for intra-coded macroblocks represented by said coefficients; pre-computing and storing a second weighting matrix {overscore (W)}[1][v][u]=2*W[1][v][u] for non-intra-coded macroblocks represented by said coefficients; computing a quantization difference to be used in selecting a weight factor based on a current macroblock quantization level; providing said weight factor from one of said stored first and second weighting matrices in response to said quantization difference and a macroblock type identifier; and iteratively computing subsequent weights Wi+1[w][v][u] from a current weight Wi[w][v][u] and said weight factor.