Posted by
Michael Schmid on
Dec 13, 2018; 1:21pm
URL: http://imagej.273.s1.nabble.com/Matlab-using-getHistogram-tp5021563p5021568.html
Hi R,
there is no ij.IJ.getHistogram method.
From Java or Javascript, one would have
ij.IJ.getImage().getProcessor().getHistogram();
These are the counts; the pixel values can be calculated by
interpolating between
ij.IJ.getImage().getProcessor().getHistogramMin() and
ij.IJ.getImage().getProcessor().getHistogramMax().
This does not work for float (32-bit) images; there one needs
ImageStatistics:
ij.IJ.getImage().getStatistics().getHistogram()
Michael
________________________________________________________________
On 13.12.18 01:41, Rsmith wrote:
> Hello,
>
> I am using ImageJ through Matlab to evaluate 8 bit black and white images. I
> have used Matlab for years but I am new to image J. For the most part
> it.IJ.run... has worked. I can't make getHistogram work. We have found that
> with the images we use there is a significant count drop off and it helps
> inform the the vales used in threshold. It would be very helpful to make the
> setting dynamic based on the histogram of each image.
>
> I think the issue is just getting the correct syntax for Matlab. The
> examples for Fiji macros is
>
> getHistogram(values, counts, 256)
>
> So I expect the be something like
>
> [values, counts]= ij.IJ.getHistogram
>
> This is not working any suggestions are appreciated
>
>
>
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