为了对全局运动进行准确快速的估计,在对全局运动估计算法进行研究的基础上,提出了一种快速全局运动估计算法。该算法基于非线性密度估计,采用了六参数的仿射模型。为了提高计算速度,采用了3层金字塔进行多分辨率计算,而且在每层迭代计算中,将基于块的外点去除算法与特征点提取算法相结合,这样既加快了算法的速度,又提高了计算结果的准确性。全局运动估计的实验结果表明,该算法在速度和准确性上具有一定的优势。

In this paper,the algorithm of global motion estimation is investigated,and a fast global motion estimation algorithm is introduced.The new algorithm is based on nonlinear dense estimation and applies the affine model.In order to reduce the time cost during calculation,three-level pyramid is utilized in the algorithm.It combines outlier detection algorithm based on blocks and feature pixels selection algorithm in the calculation of each pyramid level.The calculation time of global motion estimation is reduced and the accuracy is improved.The experimental results show that the new algorithm is superior to original algorithms in velocity and accuracy.