Apparatus for detecting motion of moving picture

DETAILED DESCRIPTION It is an object of the present invention to provide an apparatus for detecting a motion of an image which is capable of reducing the difference absolute value of additions when obtaining a motion vector.
The object of the present invention can be achieved by an apparatus for detecting a motion of an image includes a first unit for calculating first partial accumulates of one block, a second unit for calculating second partial accumulates about candidate coordinates and for storing total accumulates which are sums with the first and second partial accumulates, a unit for selecting a minimum total accumulate from the total accumulates stored in the second calculating unit and for outputting the minimum total accumulate together with a location coordinate corresponding to the minimum total accumulate.
Preferably, the apparatus is so arranged that pixel values corresponding to blocks to be searched in a searching range are sequentially compared with each other for obtaining motion vectors of two or more pixels between frames of the image.
More preferably, the apparatus is so arranged that the location coordinate having the minimum accumulate is set as a motion vector.
Further preferably, the first calculating unit is so arranged that a number of calculations of partial accumulates to be performed is (M.
times.
N)/A, the M.
times.
N representing numbers of pixels in the one block and the A representing a high-speed operation coefficient.
The second calculating unit is so arranged that a number of calculations of accumulates to be performed is {1-(1/A)}.
times.
M.
times.
N, the M.
times.
N representing numbers of pixels in the one block and the A representing a high speed operation coefficient.
Each of the total accumulates corresponds to a sum of any one of the accumulates and any one of the partial accumulates.
In operation, the apparatus for detecting a motion of an image (referring to a detector, hereinafter) operates to use a coefficient for speeding up an operation for reducing the calculation times of partial accumulates for one block each consisting of M by N pixels