在基于块的帧速率上转换算法中，块尺寸直接影响运动估计的准确性及插值帧的视觉效果。为此，提出了一种运动自适应的帧速率上转换算法。通过引入STGS图对视频内容进行预分析，根据运动特性自适应选取适合每一帧图像的块尺寸，进行重叠的块运动估计。并针对失真易产生在块边缘的特点，对块边缘的运动矢量进行插值细化处理，平滑运动矢量场，减轻人眼敏感的块效应。实验结果表明，该算法整体性能优于传统的固定块尺寸运动估计的帧速率上转换算法。

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.