Patent ID: 7649944
Filing Date: 2010-01-19
Classification: G06F,H04N

Abstract:
1. An image coding method for coding a picture in an image on a block basis, the image coding method comprising: a reference motion vector obtainment step of obtaining a reference motion vector for deriving a motion vector of a current block to be coded; a first parameter calculation step of calculating a first parameter corresponding to a distance between a picture including the reference motion vector and a picture referred to by the reference motion vector; a second parameter calculation step of calculating at least a second parameter corresponding to a distance between the picture including the current block and a picture referred to by the current block; a judgment step of judging whether or not the first parameter is within a range of predetermined values; a motion vector derivation step of deriving the motion vector of the current block by scaling the reference motion vector based on a selected one of the predetermined values and the second parameter, when it is judged in said judgment step that the first parameter is not within the range of predetermined values, and by scaling the reference motion vector based on the first parameter and the second parameter, when it is judged in said judgment step that the first parameter is within the range of predetermined values; a motion-compensation step of generating a motion-compensated image of the current block using the motion vector derived in said motion vector derivation step; and a coding step of coding, by a coding unit, the current block using the motion-compensated image.