I have noisy data set with three peaks in Matlab and want to do some image processing on it. The peaks are about 5-9 pixels wide at the base, in a 50 x 50 array. How do I locate the peaks? Matlab is very new to me. Here is what I have so far...

For my original image, let's call it "array", I tried

J = fspecial('gaussian',[5 5], 1.5);
C = imfilter(array, J)
peaks = imregionalmax(C);

but there is still some noise along the baseline between the peaks so I end up getting a ton of local max that are really just noise values. (I tried playing with the size of the filter, but that didn't help.) I also tried

peaks = imextendedmax(C,threshold);

where the threshold was determined visually... which works but is definitely not a good way to do it since it's not that robust obviously.

So, how do I locate these peaks in a robust way? Thanks.