[Insight-users] How to determine minimum between two maximums of a histogram?

[Luis Ibanez]

Hi TomTom,


Option A:

Would you consider the option of using the Otsu Threshold Calculator ?
http://www.itk.org/Doxygen/html/classitk_1_1OtsuThresholdCalculator.html

This will not necessarily give you the minimum between the two classes,
but, it will give you the point that maximize the variance.


Option B:

You can treat your histogram as a 1-D image, and use the filter:
http://www.itk.org/Doxygen/html/classitk_1_1MinimumMaximumImageFilter.html

that will return the location of the minima and maxima.

To convert from Histogram to Image you can use:
http://www.itk.org/Doxygen/html/classitk_1_1HistogramToImageFilter.html

and if Smoothing of the histogram is required,
you can also use any of the ITK smoothing
filters, in that 1-D image to which you just
converted your Histogram.


       Luis


-----------------------------------------------
On Thu, May 24, 2012 at 9:00 AM, tomtom <ms.rit at web.de> wrote:

> Hello.
>
> Assuming I have a histogram of distances, so basically values between 0 and
> 1.
> In my case, I always have two "obvious" maximums.
> Whats the way to get the minimum between those two maximums? (The best
> would
> be to smooth the histogram in prior.)
>
> Any suggestions?
>
> The only thing that comes to my mind is to interpolate a polynomial, and to
> determine the min, max analytically.
>
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