Patent ID: 7519117
Filing Date: 2009-04-14
Classification: G06T,H04N

Abstract:
1. A method of synthesizing an inter-frame predicted image in a video decoder, comprising the step of: performing a motion compensation process between a current image and a reference image, wherein said motion compensation process includes the steps of: dividing said current image into N patches, N being a positive integer, 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), obtaining motion vectors of the three representative points, and computing a motion vector of each pixel in the patch Pa by affine transformation using the motion vectors of the three representative points, wherein either of p and −p 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 m is a positive integer, and (u(x, y), v(x, y)), 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 Pa by m, is shown using (u wherein u wherein v(x,y)=((v wherein symbol “//” denotes a division that rounds to a nearest integer an operation result obtained from a division of real numbers when the result is not an integer and its priority as an operator is equal to that of a multiplication or division.