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Selective Segmentation A -- Segment a given 2D image (CV2 with prior knowledge: AOS solver) --- (2010)

Software for Selecting an Object in a large image using an improved Chan-Vese model
Communications in Computational Physics (CiCP) ``Image Selective Segmentation under Geometrical Constraints Using an Active Contour Approach'' Noor Badshah and Ke Chen (2010)
``Image Selective Segmentation under Geometrical Constraints Using an Active Contour Approach",
Communications in Computational Physics (CiCP), Vol. 7, pp. 759-778, 2010. See PDF file.

See the left image for an example of selection by 4 vertices and the segmented result below.
(Note: as with CV2, this model is not convex so the result might be sensitive to initial contours and also the input parameter α.