material for comparison of different technique of edge detection.

本文在众多图像分割方法中选择了研究比较早的边缘检测方法来实现图像的分割，并且比较了各种边缘检测算子的检测效果。-This text choose EdgeDetection method that is a study early for image segmentation to carry out Detection image, and compare every kind of edge detection technique.

threshold is a key technique for the segmentation and edge detection in an image for image processing. Here in this file the threshold is on the based of the maximum entropy of an image using shannon entropy method.