Patent ID: 6687302
Filing Date: 2004-02-03
Classification: H04N

Abstract:
A video decoder comprising:a memory for storing a decoded image of a reference frame; and a predicted image synthesizing unit for synthesizing a predicted image of a present frame by using said decoded image and the information related to said present frame, wherein said predicted image synthesizing unit comprises: means for calculating motion vectors of 3 representative points having coordinates (i,j), (i+p,j), and (i,j+p) using motion vectors of corner points of said predicted image having coordinates (0,0), (r,0), and (0,s), where r, s, i, and j are integers, p and q are integer powers of 2, p is greater than or equal to r, p/2 is less than r, q is greater than or equal to s, q/2 is less than s, and the sampling intervals of pixels are 1 in both horizontal and vertical directions; means for calculating the motion vector of each pixel in said predicted image from said motion vectors of said representative points; and means for synthesizing said predicted image from said motion vector of each pixel and said decoded image.