Linescans in ImageJ

[Melody212]

Hello to all,

I have a question related to the linescans in ImageJ.
I have measured the intensity of a part of my picture with the freehand line tool. With the command "Plot Profile" I have got the grey values which are plotted over the distance of my linescan.
Is there a possibility to get the average grey value of a specific part of the plot? I only know how to get the average value of the whole plot.

Thank you very much for your help.

[Pariksheet Nanda]

On Sun, Jul 28, 2013 at 9:24 AM, Melody212 <[hidden email]> wrote:
> I have measured the intensity of a part of my picture with the freehand line
> tool. With the command "Plot Profile" I have got the grey values which are
> plotted over the distance of my linescan.
> Is there a possibility to get the average grey value of a specific part of
> the plot?
>

Do you mean 1D or 2D average?
For 1D average you could either do a running average of values within
your "Plot Profile", or nearby perpendicular points in the image not
(currently) measured by your line scan.
For nearby points, double-click on the line scan tool to adjust the
line width (you will see the changing measured area highlighted on the
image), and then you can run "Plot Profile" again.
For averaging values within the plot you can write a macro using
getProfile() and do a running average on the resulting array.
For a 2D average you could run something like Process > Filters > Mean
and run "Plot Profile".

Pariksheet

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