Rank: 436 based on 263 downloads (last 30 days) and 4 files submitted
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Christoph Eberl

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Company/University
Karlsruhe Institute of Technology (KIT) and Johns Hopkins University

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Professional Interests:
Material Science, Experimental Mechanics

 

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19 Nov 2010 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl application, digital image correla..., tracking, image processing, i am new to matlab an..., sorry as it mught be ... 185 71
  • 4.31034
4.3 | 31 ratings
15 Sep 2008 Digital Image Correlation 4 threads pmode This digital image correlation .m file uses pmode to split up the load on 4 matlab labs Author: Christoph Eberl application, digital image correla..., image processig 19 0
  • 4.0
4.0 | 1 rating
02 Jan 2007 Digital Image Correlation Two Threads Starts two instances of matlab divides the grid and merges validx and validy, Needs Digital Image Co Author: Christoph Eberl application, digital image correla... 15 1
02 Oct 2006 Digital Image Correlation and Tracking Example Files and Slides Package includes Sample Imges for Digital Image Correlation and Tracking Author: Christoph Eberl application, digital image correla... 44 19
  • 4.09091
4.1 | 11 ratings
Comments and Ratings by Christoph View all
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21 Oct 2010 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl

Hi Ali,

I guess you need to check for face detection algorithms, the DICT code won't work for this purpose.

Chris.

18 Oct 2010 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl

Hi Lorraine,

you can find cpcorr in the folder for the image processing toolbox (../matlab/images/images/private).

Chris.

12 Oct 2009 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl

Hi Sampath,

you're absolutely right and I very much like the experiment you conducted. Actually your point is always relevant if either the surface or the illumination is changing. After all everything depends on that. Rob Thompson used the floating reference image in his software as far as I remember(file id 14850) to deal with the changes in illumination when going from RT to 1200°C.
In case of large deformations your changes are going to make the code work much better. For small deformation that would introduce some error, therefore it would be useful if the code either decides by itself to apply this method or the user can decide at the beginning. We will put that into the next version of the code.
The same problem comes up in case of rotation to which DIC is extremely sensitive. Other codes are capable of taking the deformation of the image into account by measuring the local deformation and applying it to the virtual markers. That would be something for the future. We will also look into that and help is always welcome. Contributions will be cited!

08 Sep 2009 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl

Hi TRAN,

this depends on the the size of the subset you are using. You set the size in cpcorr.m . With the initial set to corrsize=5 pixels the detection is roughly 2-3 pixels, if you turn it up to15 or 20 we were able to track jumps of 15 pixels (due to cracking of a sample). If the jumps are too large, you can reduce the size of the image. You could also alter the code to run a rough analysis on a reduced image size before you run the dense analysis. We were able to detect jumps of up to 100 pixels that way. Unfortunately the code is not as polished and prooven as it should be before we release it on matlab.

Cheers, Chris.

20 Aug 2009 Digital Image Correlation and Tracking Example Files and Slides Package includes Sample Imges for Digital Image Correlation and Tracking Author: Christoph Eberl

Hi Gabe,

thanks again, we'll change that in the future.

All the best, Chris.

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24 Jun 2014 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl Wang, Shengfu

There is an error when I try to make a change to cpcorr which is "Error writing cpcorr.m Check if directory is read-only, or has been renamed or deleted." Did anybody know to solve this problem? Thank you in advance.

18 Feb 2014 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl Butchart, Caroline

Hi All,

After running 3D mesh plot of displacement, and deleting markers I then use the 'save validx and valid y' button in the menu. I can save the .dat files, however I get the same error every time I try to open them:

Undefined function 'sum' for input arguments of type 'cell'.

Error in mean (line 30)
y = sum(x,dim)/size(x,dim);

Error in displacement (line 52)
validxfirst=mean(validx(:,1),2)*ones(1,sizevalidx(1,2));

I don't get this error with the original validx and y files. But then I need to re-delete badly tracked markers. Has anyone encountered this?

Thanks for the code

16 Nov 2013 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl Aditya

hello, thanks for the code.,
it would be of great help,if you could send the edited copy of the same 'to save the values of displacement vs position'
to following address : hanamasagar1@yahoo.com
Regards.

04 Nov 2013 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl pengyuan

hello, really appreciate for your work. I'm a student in Sheffield University.
i'm using your code for deformation measurement. I met some difficulties of extracting numerical data from the DIC result figure. could you help out? really thanks.

28 Sep 2013 Digital Image Correlation and Tracking Calculate displacement and strain from a series of images Author: Christoph Eberl Wang, Dong

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