Phase unwrapping with a minimum spanning tree

[David Backman]

I am using using IMAQ vision to process data from photoelastic and Speckle interferometry. I would like to implement a minimum spanning tree algorithm for the phase unwrapping.
1) Does anyone have a VI or some code they could share
2) Is it possible to do this using IMAQ vision

Thanks for any help you can provide
Dave

[BruceAmmons]

Dave,

I don't have any code, but I have an interest in speckle interferometry and will probably need to do phase unwrapping in the future. I would be interested in brainstorming with you on what algorithms to use for phase unwrapping as well as other aspects of interferometry. Feel free to email me at bruce@ammonsengineering.com or give me a call at (810) 687-4288.

Bruce

[pj.canoy]

Hi

I am a student from the Philippines and I think that we are the same boat of research. I'm doing displacement measurement using speckle photography. Do any of you have an idea how can I implement differentiation of image in LabVIEW. For me to get the strain field along x. I need to do dv/dx. Do you know how to get this from a set of deformed and underformed speckle pattern images?

PeeJay

[BruceAmmons]

No.  I ended up going in a different direction since I posted that message (6 years ago!!), so I never did much with interferometry or phase unwrapping.  Perhaps somebody else out there has done this sort of thing.

Bruce

[rpursley8]

A few years back I was using phase unwrapping for magnetic resonance elastography.

I ended up buying a book called "Two-Dimensional Phase Unwrapping: Theory, Algorithms, and Software" (ISBN: 0-471-24935-1)

It came with several different uwrapping algorithms in the form of C code.  The code was listed in the book and also a link to download it.  It was very helpful.  Since the licensing mentions having to own the book I am reluctant to post the link.