%%?Read?image
clear
f?=?im2double（imread（‘G:\ant\ant_6.bmp‘））;

%%?Display?image
imshow（f[]）;title（‘Original?image‘）;
pause

%%?Edge?Detection
%?[g?t]?=?edge（f?‘method‘?parameters）;

%%?Sobel?Edge?Detection?
%???automatic?threshold
[v?t]?=?edge（f?‘sobel‘??‘vertical‘）;
imshow（v）;title（sprintf（‘Sobel?Edge?Dectection?[auto?vertical?t?=?%0.2f]‘t））;
pause

%???manual?threshold
t?=?0.15;
v?=?edge（f?‘sobel‘?t?‘vertical‘）;
imshow（v）;title（sprintf（‘Sobel?Edge?Dectection?[manual?vertical?t?=?%0.2f]‘t））;
pause

%???Sobel?edge?+45?degree
w?=?[-2?-1?0;?-1?0?1;?0?1?2];
v?=?imfilter（f?w?‘replicate‘）;
t?=?0.3*max（abs（v（:）））;
v?=?v?>=?t;
imshow（v）;title（sprintf（‘Sobel?Edge?Dectection?[manual?+45?t?=?%0.2f]‘t））;
pause

%???Sobel?edge?-45?degree
w?=?[0?1?2;?-1?0?1;?-2?-1?0];
v?=?imfilter（f?w?‘replicate‘）;
t?=?0.3*max（abs（v（:）））;
v?=?v?>=?t;
imshow（v）;title（sprintf（‘Sobel?Edge?Dectection?[manual?-45?t?=?%0.2f]‘t））;
pause

%%?Other?methods