histogram from ROI

[Barnes Anna (UNIVERSITY COLLEGE LONDON HOSPITALS NHS FOUNDATION TRUST - RRV)]

Dear All
is it possible to output all pixel values from an ROI to create an histogram of values?

I've been using Plugins>Tools>Display Pixel Values but this only seems to give the output from a rectangular ROI within the one I've drawn.

I'm using ImageJ 1.45s for windows.

Thanks
Anna


Anna Barnes, PhD, CSci, MIPEM
Clinical Scientist
UCL Institute of Nuclear Medicine
UCL Hospitals NHS Foundation Trust
235 Euston Road   |   London NW1 2BU   |   UK
[hidden email]
[phone]

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[Michael Schmid]

Hi Anna,

the ImageJ Macro function getHistogram does exactly what you want, no need to output the pixels.
  http://rsb.info.nih.gov/ij/developer/macro/functions.html#getHistogram

When programming Java, use
  myImagePlus.getStatistics(AREA+MEAN+MODE+MIN_MAX, nBins, histMin, histMax)

Michael
________________________________________________________________
On Aug 28, 2012, at 13:47, Barnes Anna wrote:

> Dear All
> is it possible to output all pixel values from an ROI to create an histogram of values?
>
> I've been using Plugins>Tools>Display Pixel Values but this only seems to give the output from a rectangular ROI within the one I've drawn.
>
> I'm using ImageJ 1.45s for windows.
>
> Thanks
> Anna

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