Re: About automatic thresholding program implemented in ImageJ

Posted by Gabriel Landini on
URL: http://imagej.273.s1.nabble.com/About-automatic-thresholding-program-implemented-in-ImageJ-tp5024552p5024557.html

On Wednesday, 31 March 2021 12:48:19 BST [hidden email] wrote:
> I would like to ask an additional question in relation to Q3.
> In my experience, errors sometimes occurred when the three
> methods(Intermodes, MinError, and Minimum) were applied, but not when the
> other methods were applied.
> Is it the same reason as the MinError method that errors also occasionally
> occur when Intermodes or Minimum method is used?
>
Hi,
Yes the Minimum, Intermodes and MinErr methods can fail to find the
appropriate threshold (which look for a feature in an increasingly smoothed
histogram for the first two cases, or a convergence to a single value in the
third case).
That situation depends on the type of histogram the image has.

Looking at the source code, the IsoData algorithm under certain conditions
could fail to find a threshold.

Hope it helps,

Gabriel

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