gusucode.com > 《matlab图像处理与界面编程宝典》秦襄培 编著，每章的MATLAB源代码程序 > 第17章/代码17-4.txt

    
BW = zeros(400,500);
BW(40:300,40:400) = 1;
figure, imshow(BW,[]); 
D = bwdist(BW);
figure, imshow(D,[]);