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Abstract

A motion vector is calculated on the basis of a current block having current block data and a search window having search window data. The search window includes integer pel blocks and half-pel blocks each deviated by half-pel pitch from each of the integer pel blocks. The search window data are repeatedly transferred between and held by the shift registers. The search window data held by the shift registers and the current block data outputted from current block data outputting means are supplied to an integer pel block distortion calculating unit of each of processor elements. The integer pel block distortion calculating unit calculates local distortion values, and each of integer pel block distortion values defined by the local distortion values and indicative of a difference between a current block and each of integer pel blocks on the basis of the received search window and current block data. Each of the processor elements further includes half-pel block distortion calculating units for calculating half-pel block distortion values each indicative of a difference between the current block and each of the half-pel blocks on the basis of the local distortion values from the integer pel block distortion calculating unit. The motion vector is detected by a motion vector detector on the basis of the integer pel block distortion values and half-pel block distortion values.

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