As a rule, according to the characteristics of living retinal images, such as gray and resolution unconsistency, some
differences in detail, etc, it is a fairly difficult problem to carry out images stitching. In this paper, a robust image
registration method based on feature points is proposed. To begin with, use RANSAC method to make rough match for
the corner. Then, Mahalanobis distance is applied in the accurate purification. Finally, execute the image stitching with
the purified corner. Practical experiments and application show that the proposed approach is feasible and effective.