![]() The rubber band like nature (= curvature) prevents the contour from leaking if there are gaps in the boundary. Level sets advance a contour like a rubber band until the contour hits an object boundary. This algorithm is sensitive to leaking - if the object has a gap in the boundary, the selection may leak to the outside of the object. ![]() While growing the region it constantly calculates the difference of the current selection to the newly added pixels and either stops if it exceeds a pre selected gray value difference or if it would exceed a certain pre-selected rate of growth. The Fiji plugin provides two PDE based methods, the more basic fast marching and the advanced active contour algorithm.įast marching works similar to a standard flood fill but is more sensitive in the boundary detection. ![]() Ideally, the algorithm will converge at the boundary of the object where the differences are the highest. progressive evaluation of the differences among neighboring pixels to find object boundaries. Level Sets are an important category of modern image segmentation techniques based on partial differential equations (PDE), i.e. Level Sets and Fast Marching Introduction
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