Patent ID: 6452969
Filing Date: 2002-09-17
Classification: H04N

Abstract:
A method of inverse motion compensating in a transform domain with fractional pel accuracy, comprising the steps of:(A) obtaining first and second fractional pel displacements between a pel target block of a target frame and a pel prediction block of a reference frame; and (B) selecting a first DCT shifting matrix that when applied to a transform domain reference block shifts said transform domain reference block by a first fractional pel amount that is based upon said first fractional pel displacement, (C) selecting a second DCT shifting matrix that when applied to said transform domain reference block shifts said transform domain reference block by a second pel amount that is based upon said second pel displacement, and (D) applying said first DCT shifting matrix and said second DCT shifting matrix to said transform domain reference block in order to obtain a first portion of said transform domain prediction block.