Patent ID: 7327788
Filing Date: 2008-02-05
Classification: G06F,H04N

Abstract:
1. A motion vector derivation method for deriving a motion vector of a block in a picture, said method comprising: a step of obtaining a reference motion vector for deriving a motion vector of a current block; a step of calculating a first parameter corresponding to a distance between a motion-compensated picture and a reference picture, wherein said motion-compensated picture is motion-compensated using the reference motion vector, and said reference picture is referred to by the reference motion vector; a step of calculating a second parameter corresponding to a distance between a current picture and the reference picture, wherein said current picture includes the current block; a judgment step of judging whether or not the first parameter is within a range having a predetermined maximum value; and a motion vector derivation step of deriving the motion vector of the current block by scaling the reference motion vector based on the predetermined maximum value of the range and the second parameter, when the first parameter is not within the range having the predetermined maximum value as a result of said judgment step, and by scaling the reference motion vector based on the first parameter and the second parameter, when the first parameter is within the range having the predetermined maximum value as a result of said judgment step.