Why do I recieve the error " Index exceeds matrix dimensions" at line number 28

A=imread('orig.jpeg');

P=imread('fcurr.jpeg');

a = rgb2gray(A);

p = rgb2gray(P);

%[I2, rect] = imcrop(a);

a2_tr = imcrop(a,[2218.5 204.5 535 521]); %transparent gandhi 1

b2_tr = imcrop(p,[2218.5 204.5 535 521]); %transparent gandhi 2

a2_str = imcrop(a,[1766.5 4.5 63 1096]); %thin strip 1

p2_str = imcrop(p,[1666.5 4.5 63 1096]); %thin strip 2

%decompose into hsv

hsvImageReal = rgb2hsv(A);

hsvImageFake = rgb2hsv(P);

figure('Name','real image hsv');

imshow([hsvImageReal(:,:,1) hsvImageReal(:,:,2) hsvImageReal(:,:,3)]);

title('Real');

figure('Name','fake image hsv');

imshow([hsvImageFake(:,:,1) hsvImageFake(:,:,2) hsvImageFake(:,:,3)]);

title('Fake');

%create black and white image

%croppedImageReal = imcrop(hsvImageReal,[1766.5 4.5 63 1096]);

croppedImageReal = imcrop(hsvImageReal,[1778.5 13.5 57 963]);

%croppedImageFake = imcrop(hsvImageFake,[1666.5 4.5 63 1096]);

croppedImageFake = imcrop(hsvImageFake,[1673.5 4.5 96 1096]);

satThresh = 0.3;

valThresh = 0.9;

BWImageReal = (croppedImageReal(:,:,2) > satThresh & croppedImageReal(:,:,3) < valThresh);

figure('Name','green strips');

subplot(1,2,1);

imshow(BWImageReal);

title('Real');

BWImageFake = (croppedImageFake(:,:,2) > satThresh & croppedImageFake(:,:,3) < valThresh);

subplot(1,2,2);

imshow(BWImageFake);

title('Fake');

%closing

se = strel('line', 200, 90);

BWImageCloseReal = imclose(BWImageReal, se);

BWImageCloseFake = imclose(BWImageFake, se);

figure('Name','closed green strips');

subplot(1,2,1);

imshow(BWImageCloseReal);

title('cReal');

subplot(1,2,2);

imshow(BWImageCloseFake);

title('cFake');

%cleanup

figure('Name','cleaned green strips');

areaopenReal = bwareaopen(BWImageCloseReal, 15);

subplot(1,2,1);

imshow(areaopenReal);

title('clReal');

areaopenFake = bwareaopen(BWImageCloseFake, 15);

subplot(1,2,2);

imshow(areaopenFake);

title('clFake');

%count black lines

[~,countReal] = bwlabel(areaopenReal);

[~,countFake] = bwlabel(areaopenFake);

disp(['The total number of black lines for the real note is: ' num2str(countReal)]);

disp(['The total number of black lines for the fake note is: ' num2str(countFake)]);

co=corr2 (a2_str, p2_str);

%display of conclusion

if (co>=0.5 && countReal == 1 && countFake ~= 1 )

disp ('correlevance of transparent gandhi > 0.5');

if (countReal == 1 && countFake ~= 1 )

disp ('currency is legitimate');

else

disp ('green strip is fake');

end

else

disp ('correlevance of transparent gandhi < 0.5');

disp ('currency is fake');

end

[Lucky]

I have got the error in same project code that co=corr2(a2_str, p2_str); How to rectify that error?

Answer 1

[Cris LaPierre]

Your line spacing appears to have changed when you pasted your code here, but the error message means you are trying to index your matrix using a value that exceeds the size of your matrix. For example, if your matrix only has 2 columns but you are trying to access values is column 5.

Here, I suspect the issue is actually with your imcrop rectangle size. Compare the size rectangle you are trying to crop with the size of your image. If the rectangle xmin or ymin exceed the numbers of rows or columns of your image, the resulting variable is empty. When you then try to index the 3rd dimension, you get an error.