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(a) Blood vessel segmentation using Frangi 2-D filter.24 (b) Blood vessel segmentation result (red) image overlay on the single-band image at 470 nm. (c) Blood vessel map created by Gaussian filter smoothing of the output of the Frangi 2-D filter. (d) Image overlay of inverted vessel map (inverted for better visualization) on the single-band reflectance image of the intestine.
