Patent ID: 7139314
Filing Date: 2006-11-21
Classification: G06T,H04N

Abstract:
1. A decoder of performing a motion compensation between a current image and a reference image for synthesizing an inter-frame predicted image comprising: means for dividing said current image into N patches, N being a positive integer; means for arranging an assumed patch Pa corresponding to a patch Pb which is one of the N patches, Pa having three assumed grid points as representative points having coordinates (I′,J′), (I′+p,J′), and (I′,J′+q); means for obtaining motion vectors of the three representative points; and means for computing a motion vector of each pixel in the patch Pb by affine transformation using the motion vectors of the three representative points, wherein either of p and −p is equal to 2 wherein either of q and −q is equal to 2 wherein the horizontal and vertical components of motion vectors at representative points (I′,J′), (I′+p,J′), and (I′,J′+q) take only values integral multiples of 1/k, wherein k is equal to 2 wherein the horizontal and vertical components of the motion vector of each pixel take only values an integral multiple of I/m, where wherein m is a positive integer, and wherein (u(x,y),v(x,y)), where wherein x, y, u(x,y), and v(x,y) are integers, obtained by multiplying the horizontal and vertical components of the motion vector of a pixel (x,y) in the patch Pb by m, is shown using (u and wherein v(x,y)=((v