Posted by
Takamasa Kitaoji on
URL: http://imagej.273.s1.nabble.com/About-automatic-thresholding-program-implemented-in-ImageJ-tp5024552p5024556.html
Dear Herbie and Gabriel
Thank you for your answer to my question.
I appreciate your instructive comments.
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?
Best regards
Kitaoji
2021年3月31日(水) 19:23 Gabriel Landini <
[hidden email]>:
> On Wednesday, 31 March 2021 04:29:03 BST
[hidden email] wrote:
> > Q1. How do I know the threshold automatically set based on each algorism
> is
> > reasonable or not?
>
> Let me add to Herbie's reply that you could set a hand crafted result (eg
> a
> binary image) which you consider "reasonable" (a ground truth set, if it
> exists or a gold standard if it does not) and compare that to the results
> obtained with various auto-thresholding algorithms. There are some
> statistics
> that let you do such comparisons like the Dice and the Jaccard indexes
> (globally to the image or individually to each blob detected) or other
> reliability measures (FP, FN, TP, TN, etc) .
>
> > Q2. Among 16 automatic thresholding algorisms, how do you decide which
> > algorithm to use for image analysis?
>
> Following the suggestion above you could compare the reliability measures
> described above and choose the method that returns the closest values to
> the
> ideal (ie that matches your ground truth or gold standard best).
>
> See for example Figs 5 to 7 in:
>
https://onlinelibrary.wiley.com/doi/full/10.1111/jmi.12474>
> > Q3. In image analysis by automatic thresholding method, I sometimes
> > encounter an error that the window of ImageJ shows“threshold not found
> > after 10000 iterations”. Are there any specific conditions when this kind
> > of error occurs? Is this some kind of bug?
>
> Please have a look at the documentation of the autothresholding plguins
> here:
>
>
>
https://blog.bham.ac.uk/intellimic/g-landini-software/auto-threshold-and-auto-local-threshold/>
> That explains the warning of the MinError method and what is the result
> returned in such cases (i.e. the the Mean threshold which is the initial
> estimate of the iterative process).
>
> Regards
>
> Gabriel
>
> --
> ImageJ mailing list:
http://imagej.nih.gov/ij/list.html>
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