I have an problem as seen below the one on top is the original image the one on the bottom is titlted to the left 90 degrees. Is there a way to calculate the change in angle. I have tried Hough's Transform, I can detect the location, however I cannot detect the angel that is changed. Is there an alternative to detect the degreeschanged.

enter image description here

enter image description here

c# image-processing
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