KYBIC, J.: High-Dimensional Mutual Information Estimation for Image Registration. In ICIP'04: Proceedings of the 2004 IEEE International Conference on Image Processing. Piscataway: IEEE, 2004, p. 4. ISBN 0-7803-8555-1. DOI: 10.1109/ICIP.2004.1421419
We present a new algorithm for mutual information estimation for image registration based on the nearest neighbor entropy estimator of Kozachenko and Leonenko. We modify the algorithm to be numerically robust and computationally efficient, with optimal asymptotic complexity O(Npixelsddim). We propose two MI-based criteria exploiting the high-dimensionality of the feature space and show their effectiveness in determining the correct alignment even in difficult cases when classical criteria fail.
