自定义函数: function []=edge_detect(image_name) a=imread(image_name); I=rgb2gray(a); BW1=edge(I,'Roberts',0.16); BW2=edge(I,'Sobel',0.16); BW3=edge(I,'Prewitt',0.06); BW4=edge(I,'LOG',0.012); BW5=edge(I,'Canny',0.12); figure('Name','进行五种边缘检测'); subplot(,,