We have added following files in matlab 1.global thresholding 2.Histogram equalization 3.low and high pass filtering 4.various masks 5.zooming 6.power law

全局阈值分割：迭代法、Otsu法；局部阈值分割-Global Thresholding: iterative method, Otsu method local threshold segmentation

code for global thresholding