1. A method for interactive level set image segmentation of an input image, comprising: utilizing a programmable digital computer for: selecting and labeling by user input respective image areas of object and of background of said input image; initializing an embedding function φ for implementing a segmenting boundary in accordance with said user input; computing intensity distributions p 1 and p 2 by performing a kernel density estimate of intensity distributions associated with said respective image areas of object and of background; and performing repeatedly steps (a), (b), (c) and (d) below until convergence is reached: (a) evolving said embedding function φ in accordance with an evolution equation, (b) recomputing said distributions p 1 and p 2 , and (c) if a new user input is found, updating labeling of said image areas of object and background and returning to said step of initializing and, if no new user input is found, then (d) if convergence is reached, ending with an image exhibiting segmentation, and if not, then returning to step (a).