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Boundary map comparison of different methods. (a) Original image. (b) Boundary map obtained by Sobel operator. (c) Boundary map obtained using the texton histograms. (d) Boundary map obtained by the proposed approach. The ground truth tumor boundary indicated in light color (green in online version), is overlaid to all boundary maps. Three dark color (red in online version) rectangles are drawn to indicate the differences among the detected boundary maps.
