ERROR CONCEALMENT PROCESSING DEVICE, MOTION PICTURE DECODER USING THE SAME, MOTION PICTURE DECODING METHOD AND MOTION PICTURE DECODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To highly accurately restore a lost region of a motion picture signal which is compression-coded by inter-motion compensation frame prediction.

SOLUTION: An error concealment processing device creates an error dispersion holding map for all pixels in a frame at each time, and continues to update the map by using Kalman filter algorithm. More specifically, an estimated error covariance matrix Pax,y(t) and a diagonal matrix Qu(t) are set as initial values (S31), and an estimated error covariance matrix Pbx,y(t) is obtained by using a state shift result At(Xx+dx,y+dy(t-1)) (S32). Then, Kx,y(t) is obtained by using a diagonal matrix Qv(t) and an observation matrix Hx,y(t) (S33), a motion vector X-x,y(t) is obtained by using the state shift result again (S34), and an estimated present image X^x,y(t) (S35). After that, the estimated error covariance matrix Pax,y(t) is updated by using the estimated original image (S36), and the processing is repeatedly executed from S32.

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