Find skew of bounding box

Luek
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I am find a business card in an image and sometimes the card is slightly skewed, how can I find the skew of the bounding box of the card?

I am using the findContours() function to find the contours and then finding the largest contour. Storing the card in... cv::Rect bounding_rect;

How can I find the skew of boudning_rect? I have a function to deskew but I am having a hard time finding the skew.

2 answers

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I suggest minAreaRect which gives you the smalles rotated rectangle that contains all given points. The result cv::RotatedRect has a member angle.

See the function fitEllipse which returns the rotated bounding box for a points set.