Image profile

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Fri, 07/07/2023 - 05:16 am

Dear all,

I would like to get a multiple automatic horizontal profile (line by line) for the enclosed image

Do you know of the existence of such a procedure?

Thanks!

 image.pxp

This function will extract the line profiles. It works on an image wave in the current data folder. Input the wave name.

Function get_HorizontalProfiles(string wname)

    wave wimg = $wname
    string theLine 
    variable ic, nlines, xo, xs, npts
   
    if (!waveexists(wimg))
        return 0
    endif
   
    nlines = DimSize(wimg,1)
    npts = DimSize(wimg,0)
    xo = DimOffset(wimg,1)
    xs = DimDelta(wimg,1)
   
    for (ic=0;ic<nlines;ic+=1)
        sprintf theLine "profile_%03d", ic
        duplicate/O/R=[][ic] wimg, $theLine
    endfor
   
    return 0
end

July 7, 2023 at 06:51 am - Permalink

Instead of creating a new wave with Make and filling it with values, you could use Duplicate/R=[][ic]. That will also automatically copy the SetScale information.

July 7, 2023 at 07:20 am - Permalink

Thank you Chozo,

Your spectra tools works very well!

I have a question:

How can I use the image in the format generated by your app?
It is not possible with the duplicate command
Here is an example

Best regards
Profile of ImagePlot_29.pxp

July 12, 2023 at 05:07 am - Permalink

I assume you want the graph of the Image Profile for display purposes? This is currently not possible. These tools a meant for processing data, so the idea is to close it when you are done and then build your own graphs. Do you just want the image with a vertically attached profile (like the example in the attachment)? This is easily done with one of my other packages:

https://www.wavemetrics.com/node/21562

The steps are as follows:

  • save the profile from your data using Image Profile
  • display your image as a new image plot (not using NewImage)
  • open Spectra Tools => Trace Offset Panel
  • select the saved profile wave under Profile at the bottom of the panel

If you don't want to use yet another package, you could also build such a graph manually. Let me know if you rather want to go this route.
Plot_29.pxp

July 12, 2023 at 07:14 am - Permalink

Dear Chozo,

Thank you for your help

I have another question:

I have been normalizing this image (enclosed here) with your package without success.
Do you know any way to do it?

Best,

Luis
Graph1.pxp

July 18, 2023 at 06:17 am - Permalink

Could you please also tell me how (in which way) you want to normalize the data and what is not working here? Basically, you have three options for normalization:

- Each Maximum: Find the maximum in each row (horizontal mode) or column (vertical mode) and normalize to this value

- Div. by Profile: Simply divide by the current profile, so that the selected region (between the red lines) is normalized on average

- Custom user code: You can also write your own normalization function, which is invoked via the user button.

July 18, 2023 at 09:19 am - Permalink