关键词: 图像分割, Mumford-Shah模型, 曲线演化, 水平集

Abstract: An improved image segmentation method based on piecewise-smooth Mumford-Shah(MS) model is proposed in this paper. An extra force is produced using the piecewise-constant MS model during the segmenting. In each time step, the additional force is added to reinitialize the level set function, advance the speed of the curve evolution. Otherwise, a nonlinear function Ψ（s） is introduced to instead of u+ and u-for edge preserving in MS model. Finally, it’s proved that this new method not only overcomes some special drawbacks of the original method, but also advances the convergence speed.

Key words: image segmentation, Mumford-Shah model, curve evolution, level set