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dicengine / dice

Digital Image Correlation Engine (DICe): a stereo DIC application that runs on Mac, Windows, and Linux
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Is there a report available for the global algorithm in DICe? #191

Open Tom1009 opened 3 years ago

Tom1009 commented 3 years ago

Hello

Thanks for this nice software.

I have a pdf file that explains the local algorithm, but is there a pdf file that explains the global algorithm?

Sorry for my inconvenience in English.

dicengine commented 3 years ago

Not currently, but if we do write one, I'll link to it here.

Tom1009 commented 3 years ago

thank you for your answer. What does the global DIC parameter "regularization constant" mean? I want to know how to determine the parameters.

dicengine commented 3 years ago

The regularization constant is the weight added the regularizing term in the formulation. In the default case, the regularization is a Horn-Schunk type smoothing of the gradient of the displacement field i.e. alpha * grad(u):grad(u) where alpha is the regularization term. For high values of alpha, the solution is smoothed more and more. For low values of alpha, a lot of noise can get introduced into the solution. It's somewhat of a balancing act to get alpha correct.

Tom1009 commented 3 years ago

thank you！ What does the global DIC parameter "gauss filter image" mean? I want to know how to determine the parameters. And I found the following treatise, but has it been resolved?

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5823413/

I'm sorry for the many questions.

dicengine commented 3 years ago

The gauss filter image parameter applies a Gaussian filter to the images prior to doing the DIC, the value of the filter is the size of the filter window.