how to plot a graph which count transitions in a binary image from black to white regions
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Image Analyst
il 27 Mar 2016
I assume you have the x,y coordinates of the perimeter of the circle. Then you can just use improfile() and call diff() and look for changes of +1.
values = improfile(binaryImage, xCircle, yCircle);
dv = diff(values);
numTransitions = sum(dv==1);
Of course you'll have to take special care at the ends of the array, like if the white part started exactly at element #1 and was zero at the very last element.
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Image Analyst
il 29 Mar 2016
Well you'll have to examine the profile to see if it's crossing narrow fingers or the much larger palm of the hand.
If you don't want to do that, then you can adapt apps by Dirk - he has lots of hand apps: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A29180
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