[xcorr2()] Counting elements using autocorellation

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Matthew Labstein
Matthew Labstein 2020-3-25
Hello everyone,
I'm trying to use the xcorr2() funtion to do an autocorrelation in order to count the number of objects on a picture. For example this one:
However, the result is not the one I expect. Here is the result of the autocorrelation:
There seems to be a sort of symmetry and a prominent central correlation (big spot in the middle) and I can't find out how to get rid of it... (even by looking further in the definition of autocorrelation)
Here is my code:
imageRGB = imread('birds.png');
imageGRAY = double(rgb2gray(imageRGB));
im = imageGRAY - mean(mean(imageGRAY));
icorr = xcorr2(im);
image(icorr);
Thanks in advance for your help!

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