The traditional C-V model can not accurately segment an image including multi-gray level objects and the segmentation speed is slow.In order to solve the problems,an image segmentation algorithm based on C-V model and gradient information is proposed.The algorithm introduces a speedup item and a weak object boundary control force in the partial differential equation of C-V model.The speedup item can effectively improve the segmentation speed,and the weak object boundary control force can avoid the weak obje...