In the block-based FRUC algorithm

block size directly affects the accuracy of motion estimation and the visual quality of interpolated frame. To this end

a new motion adaptive FRUC algorithm is proposed. Firstly

STGS image which analyzes the content of the frame is introduced to select a suitable block size adaptively for each frame according to the motion feature. Then motion vectors are obtained by using OBME (overlapped block motion estimate). Furthermore

the MVIR (motion vectors interpolated refinement)along the block boundaries is performed to reduce the block artifacts

which is capable of smoothing the motion vectors field and reducing block effect. Experimental results show better performance of the proposed algorithm compare with traditional block-based FRUC algorithm.