Inter-frame motion predicting method

TLDR: In this article, a motion prediction of the other both direction prediction encoding frame, from one both direction encoding frame and a forward prediction frame, etc., is executed to improve the prediction accuracy of dynamic image data.

Abstract: PURPOSE:To improve the prediction accuracy of dynamic image data by executing a motion prediction of the other both direction prediction encoding frame, from one both direction prediction encoding frame and a forward prediction frame, etc. CONSTITUTION:A both direction prediction encoding frame B0 is predicted from an intra-encoding frame I0 and a forward prediction encoding frame P0 as heretofore, but a both direction prediction encoding frame B1 is predicted from the B0 and the P0 of one frame before. Also, the case when a both direction prediction frame B exists more than three frames (B0, B1, B2) between the frames I0 and P0 is also the same, and the frame B1, B2... except the frame B0 are always predicted from the B0, the B1... and the frame P0 of one frame before. In such a way, since the prediction from the both direction prediction encoding frame of one frame before can be executed, the prediction accuracy is raised, compared with the prediction from the frame I0 separated timewise, and the compression efficiency of image data is improved.