applying a binary as a selection

Posted by michael shaffer on Apr 08, 2006; 1:52pm
URL: http://imagej.273.s1.nabble.com/applying-a-binary-as-a-selection-tp3703129.html

For a specific task, I want to survey the variety of automatic binary
thresholding techniques available for ImageJ (e.g., Otsu, maximum entropy,
...).  However, I first need to threshold regions that are both darker and
brighter (step#1, e.g., other phases and surface defects) than what is to be
exposed to the binary thresholding (step#2).

Presumably, what is selected with ImageJ is only what is available to the
binary thresholding.  However, I cannot find a way to apply the step#1
thresholding to step#2 (e.g., similar to copying a binary to a Photoshop
alpha channel).

Preliminary work with another software has revealed "minimum error"
thresholding (e.g., Kittler) seems to work best for my task.  I would like
to find this technique available as a ImageJ plug-in.  "Maximum entropy"
thresholding works well too, but I am finding the method described by
Shannon to work Better than Johannsen.  Is there a specific reference for
the maximum entropy method available for ImageJ?

My references to thresholding methods are in the following paper:

B. Sankur, M. Sezgin, A Survey Over Image Thresholding Techniques And
Quantitative Performance Evaluation
http://www.busim.ee.boun.edu.tr/~sankur/SankurFolder/Threshold_survey.pdf

TIA, Michael Shaffer  :o)

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