New local auto threshold methods

[Gabriel Landini]

Hi,
I added 3 more local threshold methods: Contrast, Otsu and Phansalkar
The jar file with the source code is available here (as well as some
information):

http://www.dentistry.bham.ac.uk/landinig/software/autothreshold/autothreshold.html

For Fiji it will be coming up in an update soon.
Let me know of any issues.

Regards

Gabriel

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