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On predictively producing a motion compensation predic tion 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 inter pixel 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 correla tion. 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 …