Fast Graph Partitioning Active Contours for Image Segmentation Using Histograms
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We present a method to improve the accuracy and speed, as well as significantly reduce the memory requirements, for the recently proposed Graph Partitioning Active Contours (GPACs) algorithm for image segmentation in the work of Sumengen and Manjunath (2006). Instead of computing an approximate but still expensive dissimilarity matrix of quadratic size, Open image in new window , for a 2D image of size Open image in new window and regular image tiles of size Open image in new window , we use fixed length histograms and an intensity-based symmetric-centrosymmetric extensor matrix to jointly compute terms associated with the complete Open image in new window dissimilarity matrix. This computationally efficient reformulation of GPAC using a very small memory footprint offers two distinct advantages over the original implementation. It speeds up convergence of the evolving active contour and seamlessly extends performance of GPAC to multidimensional images.
KeywordsImage Processing Pattern Recognition Computer Vision Image Segmentation Active Contour
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