multipass

[Rory Cerbus]

Hello, thank you for all of your hard work on this nice code!

I was wondering about the number of windows in multi-pass (windef). 

I wanted to see how the result might improve if I did more passes, but it seems that the number of iterations is fixed. If I set:

settings.windowsizes = (128, 64, 32) # if longer than n iteration the rest is ignored

settings.overlap = (64, 32, 16) # This is 50% overlap

Then I get 32 pixel windows with 16 pixel (50%) overlap. 

If however I set:

settings.windowsizes = (256, 128, 64, 32) # if longer than n iteration the rest is ignored

settings.overlap = (128, 64, 32, 16) # This is 50% overlap

Then it truncates the iterations at 64 pixel windows with 32 pixel overlap. Since the comment in the tutorial (which I just copied and pasted and then have been modifying) suggests that the number of iterations is set somehow, I tried to change it with this:

settings.iterations = 3 # select the number of PIV passes

(I also tried 4 and 5), but to no avail. It always stops at 64. When you have time would someone be willing to help me with this?

Best regards,

Rory

[Alex Liberzon]

The correct settings is called num_iterations. I guess that was a problem.

see this notebook that should answer your questions

https://github.com/OpenPIV/openpiv-python-examples/blob/main/notebooks/test_number_iterations.ipynb

[Rory Cerbus]

Dear Alex,

Thank you, that worked!

Best,

Rory

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