setBackground - mayo shoulder data crash

[amymmorton]

Tested from #76

The mayo radiograph test set (shldimg0005 Prop_Int) I have are incredibly 'dense' black when rendered. I wanted to see if setBackground could provide a better input to the ncc calc

on setBackground (following threshold popup) a QWindowsWindow error is returned in cmd and and unhandled exception thrown line 186 Video.cpp

With the Knee data (311135_L_Hop) the same QWindowWindows error message is populated in cmd but the unhandled exception does not occur

[NicerNewerCar]

@amymmorton
I was able to get a different error, by loading the same data from #203. I am getting errors within both the CUDA and OpenCL backends, the same values I tested work on the sample data.

I have not been able to reproduce the error within the Video.cpp yet. Could you send me this dataset?

In order to set the background you need at minimum 2 images per camera. This should definitely fail more gracefully than some random CUDA/OpenCL errors...

Investigating the pointer error now.

The QWindowsWindow error is something that has been happening for a while during the start-up of the UI and will be addressed when the larger UI improvement starts.

[amymmorton]

I create a truncated dataset for debugging (8 frames)

[amymmorton]

And agreed- I had the error on both cuda/opencl backend builds