MATLAB: Index exceeds the number of array elements (2).???

Question

i am using folowing code for template matching using normxcorr2,and i get above error, please review the code and guid me.

code :

function findtemplate(im,temp,th,showtemp)
out = normxcorr2(temp,im);
[m,n] = size(temp);
out = out(m+1:end,n+1:end);
bw = out>th;
r = regionprops(bwlabel(bw));
if nargin > 3 
    im(1:m,1:n) = temp;%,r(i).Centroid(3),r(i).Centroid(4)
end
clf
imshow(im,[])
hold on 
for i=1:length(r)
    rectangle('position',[r(i).Centroid(1),r(i).Centroid(2),r(i).Centroid(3),r(i).Centroid(4)],'LineWidth',5);
end

error:

Index exceeds the number of array elements (2).

Error in findtemplate (line 14)

rectangle('position',[r(i).Centroid(1),r(i).Centroid(2),r(i).Centroid(3),r(i).Centroid(4)],'LineWidth',5);

Answer 1

I guess you are trying to draw rectangles using BoundingBox instead of Centroid. Centroid just have two elements, therefore, r(i).Centroid(3) gives error. Change the line to

rectangle('position',[r(i).BoundingBox(1),r(i).BoundingBox(2),r(i).BoundingBox(3),r(i).BoundingBox(4)],'LineWidth',5);