Exactly Which otsu extension is working at back end of multithresh.m in matlab2013a.
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Spandan Tiwari on 8 Feb 2014
The algorithms are from the paper:
Otsu, N., "A Threshold Selection Method from Gray-Level Histograms," IEEE Transactions on Systems, Man, and Cybernetics, Vol. 9, No. 1, 1979, pp. 62-66.