Fast and Rotation-invariant Image Registration Using Ring Zernike Moments

Abstract

A modified algorithm for image registration by ring Zernike moments is presented, which has rotation-invariance as well as the method based on the original Zernike moments. Ring Zernike moments are rotation-invariant and orthogonal similarly to the original ones. A Zernike moment consists of ring Zernike moments defined on separated ring regions of the common center. We can construct a fast algorithm for registration of rotated images by utilizing a few ring Zernike moments as a feature vector and evaluation of dissimilarity be-tween feature vectors. Fundamental characteristics and stability of ring Zernike moments are experimentally investigated. From experiments with synthesized and measured images, it has been shown that speed-up of more than 95% of computation time could be achieved by use of the proposed ring Zernike moments.