Certain images give div/0 error for value of det_a

[MazrimCage]

Exporting a batch of .tif images from a video file and they mostly work well. There are some image pairs that when used with the code will give a zero value for "det_a" which generates a div/0 error and produces a black image result. This issue also arises when exporting the same batch of images after modulating brightness/gain/sensitivity to increase image contrast prior to running through code.

Are there known reasons as to why det_a would be zero?

"RuntimeWarning: divide by zero encountered in divide:
v = (carriers[0].k_loc[1] * phis[1] - carriers[1].k_loc[1] * phis[0]) / det_a"

Thanks

[kasper64]

Hey,
Unfortunately I know very little about the actual algorithm/maths involved. I can only tell that det_a is only calculated from the reference image (i_ref). Maybe something is wrong with some of your reference pictures? Maybe you can show me one of them.