what is problem in the following matlab codes
- by raju
img=imread('img27.jpg');
%function rectangle=rect_test(img)
% edge detection
[gx,gy]=gradient(img);
gx=abs(gx);
gy=abs(gy);
g=gx+gy;
g=abs(g);
% make it 300x300
img=zeros(300);
s=size(g);
img(1:s(1),1:s(2))=g;
figure;
imagesc((img));
colormap(gray);
title('Edge detection')
% take the dct of the image
IM=abs(dct2(img));
figure;
imagesc((IM));
colormap(gray);
title('DCT')
% normalize
m=max(max(IM)); IM2=IM./m*100;
% get rid of the peak
size_IM2=size(IM2);
IM2(1:round(.05*size_IM2(1)),1:round(.05*size_IM2(2))) = 0;
% threshold
L=length( find(IM2>20)) ;
if( L > 60 )
ret = 1;
else
ret = 0;
end
