url = 'http://geo.fsv.cvut.cz/user/gin/git1/matlab/img/';
K1 = imread(strcat(url,'kucharky.tiff'));

%figure(1), imshow(K1);
%{
 
 'log'       Laplacian of Gaussian filter
 'prewitt'   Prewitt horizontal edge-emphasizing filter
 'sobel'     Sobel horizontal edge-emphasizing filter
 'roberts'   specifies the Roberts method.
 'zerocross' specifies the zero-cross method.
 'canny'     Canny method
%}
K2 = edge(K1, 'log');
figure(2), imshow(K2);

K3 = edge(K1, 'prewitt');
figure(3), imshow(K3);

K4 = edge(K1, 'sobel');
figure(4), imshow(K4);

K5 = edge(K1, 'roberts');
figure(5), imshow(K5);

K6 = edge(K1, 'zerocross');
figure(6), imshow(K6);

K7 = edge(K1, 'canny');
figure(7), imshow(K7);

