Does anyone know a popular outlier removal technique other than RANSAC (Random Sample Consensus)? To enhance the performance of image registration, I have proposed a technique to reject false matches after obtaining keypoint matches. To verify the effectiveness of the proposed technique, it is necessary to compare with existing outlier removal techniques. RANSAC should be the most famous one, but it is old. It would be better to include some other popular outlier removal technique(s) when making performance comparisons. If anyone suggests some outlier removal technique, it would be great that the source code is avaible. Thanks.