Re: About automatic thresholding program implemented in ImageJ

Posted by Takamasa Kitaoji on
URL: http://imagej.273.s1.nabble.com/About-automatic-thresholding-program-implemented-in-ImageJ-tp5024552p5024559.html

Thank you.
I will be careful to focus on the grayscale histogram of the original image
in case of errors.

2021年3月31日(水) 21:46 Gabriel Landini <[hidden email]>:

> 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
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>


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