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You need to detect somehow the rectangle, maybe with a threshold + findContours and then using minArea, you will find the rotated rectangle. By affine transformation, you can rotate it bac to the wanted "vertical position".

You need to detect somehow the rectangle, maybe with a threshold threshold + findContours findContours and then using minArea, minAreaRect, you will find the rotated rectangle. By affine transformation, transformation, you can rotate it bac to the wanted "vertical position".

You need to detect somehow the rectangle, maybe with a threshold + findContours and then using minAreaRect, you will find the rotated rectangle. By affine transformation, you can rotate it bac to the wanted "vertical position".