Suppose I have a binary image BW and I'm using bwlabel to find the connected area of 1. I want to find the largest group of this result (which is not 0) and also the location where this group is located in the picture. How to do this?
there are several ways to accomplish that, for example histogram the content of the nonzero elements:
L=bwlabel(I);
[a val]=hist(L(:),1:max(L(:)))
val(a==max(a))
will yield the value that is most occuring
another way is to use tabulate :
a=tabulate(L(:))
a(a(:,2)==max(a(2:end,2)),1)
tabulate creates a frequency table of data in vector L(:). The information is arranged as follows:
1st column — The unique values of L
2nd column — The number of instances of each value
3rd column — The percentage of each value
etc...