A motion video signal (2000), especially a frame-skipped signal is interpolated by detecting motion vectors in a detector (15). A motion estimation circuit (16) computes a representative motion vector which is used to control the interpolation within a storage and computation unit (100) in which several frames are stored in a buffer (11) and read out by a speed matching circuit (12) in accordance with a scanning speed signal (1012) from a control generator (10). A frame of the video signal is also stored in a frame memory (18) which is addressed by an address generator (17) under control of the representative motion vector from the estimation circuit (16) to introduce a corresponding shift and thereby effect motion adaptive interpolation. The control generator (10) also controls a change-over circuit (14) to select the signal from the frame memory (18) or as read out from the buffer (11). Various embodiments of the motion estimation circuit (16) are described. All implement the principle of modifying the representative vector in such a manner that its frame to frame variation is limited to a predetermined range. This avoids jerky interpolation.
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