Re: Otsu filter

Posted by Gabriel Landini on Apr 07, 2006; 9:32am
URL: http://imagej.273.s1.nabble.com/Controlling-uniblitz-tp3703184p3703186.html

On Thursday 06 April 2006 22:45, Wayne Su wrote:
> I am looking for the Otsu filter that have 2 or more thresholds. Anyone
> happens to know that, please let me know. Thanks in advance.

There are 2 different ways to look at the problem:

1. To extend the algorithm to more than 2 levels:

http://www.iis.sinica.edu.tw/JISE/2001/200109_01.pdf 2.

2. To sub-segment each phase of the previously segmented image

http://dx.doi.org/10.1109/83.679444

Obviously these methods do not produce the same result.

If you implement method 1, please let me know. This would a be very useful
plugin.

Method 2 is trivial, just reapply otsu's algorithm to the sub-histograms of
the image.

Cheers,

Gabriel