运动估计在视频图像压缩、超分辨率重建、拼接、目标检测等方面具有重要的应用意义。针对高精度的亚像素运动估计问题,引入一种优化滤波器用于计算图像梯度,并采用上采样与抛物面拟合梯度互相关曲面相结合的方法,探讨一种高精度的亚像素全局运动估计算法。实验结果表明,该算法不仅对噪声影响具有较好的鲁棒性,同时能够有效地提高运动估计的精确性。

Motion estimation is significant in the applications of video image compression, super-resolution reconstruction, mosaic, and target detection, and so on. In this letter, we present an improved algorithm for the problem of highly accurate sub-pixel global motion estimation, which introduces an optimal filter for computing image gradient, and also adopts the method of combining upsampling with paraboloid fitting gradient cross-correlation. Experimental results show that the proposed algorithm can not only achieve good robustness to the influence of noise, but can also improve the accuracy of motion estimation significantly.