Image sequence segmentation based on a similarity metric
Jovan G. Brankov, Nikolas P. Galatsanos, Yongyi Yang, Miles N. Wernick · 2002 IEEE Nuclear Science Symposium Conference Record · 2004
In this paper we present a new approach for clustering of time-sequence imaging data. The clustering metric used is the normalized cross-correlation, also known as similarity. The main advantage of this metric over the more-traditional Euclidean distance, is that it depends on the signal's shape rather than its amplitude. Under an assumption of an exponential probability model that has several desirable properties, the expectation-maximization (EM framework is used to derive two iterative clustering algorithms. In numerical experiments based on a simulated dynamic PET brain study, the proposed method achieved better performance than several existing clustering methods.