Post summary: The level set method is a powerful alternative way to represent N-dimensional surfaces evolving through space. (This is a significantly extended blog-post version of three slides from my Medical Visualization lecture on image analysis.) Imagine that you would like to represent a contour in 2D or a surface in 3D, for example to delineate objects in a 2D image or in a 3D volumetric dataset. Now imagine that for some reason you would also like have this contour or surface move thro...