http://imagej.273.s1.nabble.com/Extract-Data-From-a-Plot-tp5017731p5017735.html
Octave). Octave does not necessarily need administrative rights to be run.
machine, in which you can have administrative rights. There exist some
ready Windows virtual machines e.g. here
> If I understand your problem correctly, you want a plot digitizer tool. I
> have used datathief in the past:
>
>
http://datathief.org>
> Good luck.
> Michael
>
> On Thu, Dec 8, 2016, 19:06 Shaw, Matthew <
[hidden email]> wrote:
>
>> Hello,
>> I need help extracting data from a plot. I found a very similar question
>> in the ImageJ archives:
>>
https://list.nih.gov/cgi-bin/wa.exe?A2=IMAGEJ;b522272.1502>>
>> However, the ImageJ plugin: Figure_Calibration requires the user to pick a
>> few points from the ROI. My goal is to have ImageJ return a robust set of
>> coordinates automatically.
>> I am specifically interested in getting pump curve data from manufacturer’s
>> published plots. The particular solution will allow users to:
>>
>> 1. Apply scaling to the ROI using Figure_Calibration.
>> 2. Set the threshold to distinguish a particular pump curve from the
>> background.
>> 3. Use the wand tool to trace a particular curve.
>> 4. Reduce the pixels that represent a curve to a set of data points
>> following the median width of pixel distribution.
>>
>> As an example see the attached TIFF and Excel files, follow the 8” impeller
>> curve. The data below was created using the Figure_Calibration plugin with
>> 10 points selected with Multipoint tool. The particular pump curve looks
>> very similar to the Figure_Calibration Tutorial here:
>>
http://lukemiller.org/index.php/2011/09/digitizing-data->> from-old-figures-with-imagej/
>>
>> Ultimately, the new plugin would allow users to obtain a General Solution
>> of the plot surface. The general plugin would allow users to “read” the
>> domed surface plot from the efficiency contours, and create (or
>> interpolate) slice segments through the efficiency dome for any possible
>> pump curve (say 8.125 inches).
>>
>> Does this plugin already exist for ImageJ? I have seen references to two
>> programs that supposedly do similar things:
>>
http://markummitchell.github.io/engauge-digitizer/>>
https://www.mathworks.com/matlabcentral/fileexchange/7173-grabit>>
>> I do not have administrative rights to use Engauge Digitizer, and I do not
>> have a MATLAB license for GRABIT.
>>
>> Thank you for any help.
>> Sincerely,
>> -Matt Shaw
>>
>> Mechanical Engineer,
>> U.S. Bureau of Reclamation
>>
>> Area Mean Min Max X Y
>> 1 0 86 86 86 8.511 61.517
>> 2 0 55 55 55 100 60.674
>> 3 0 63 63 63 200 60.112
>> 4 0 72 72 72 327.66 58.989
>> 5 0 52 52 52 438.298 56.461
>> 6 0 80 80 80 529.787 52.528
>> 7 0 71 71 71 591.489 49.157
>> 8 0 92 92 92 674.468 43.539
>> 9 0 82 82 82 742.553 38.483
>> 10 0 77 77 77 834.043 31.18
>>
>> --
>> ImageJ mailing list:
http://imagej.nih.gov/ij/list.html>>
> --
> ImageJ mailing list:
http://imagej.nih.gov/ij/list.html>
Dr. Giorgio De Nunzio PhD
Dipart. di Matematica e Fisica "Ennio De Giorgi", Univ. del Salento
DReAM (Laboratorio Diffuso di Ricerca Interdisciplinare Applicata alla Medicina)