Importance

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Abstract

On predictively producing a motion compensation prediction picture predictive of a current picture by using a previous picture which precedes the current picture among successive pictures represented by an input picture signal, a window function producing circuit (40) produces a window function in response to the current picture. Each picture comprises a predetermined number of blocks of pixels. The window function producing circuit comprises an interpixel correlation calculating circuit (21) for calculating an interpixel correlation from the pixels of the current picture and a window function determining circuit (23) for determining the window function on the basis of the interpixel correlation. A memorizing circuit (38) memorizes the previous picture as a reference picture. A vector detecting circuit (37) detects a motion vector representative of a movement of each block of the current picture between the current and the reference pictures and delivers the motion vectors for the blocks of the current picture to the memorizing circuit to make the memorizing circuit produce, as reference blocks, the blocks of the reference picture that are determined by the motion vectors for the blocks of the current picture. A prediction picture producing circuit (39) produces the motion compensation prediction picture given by multiplying each of the reference blocks by the window function and by adding the reference blocks multiplied by the window function to one another.

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First Claim