JavaCV or OpenCV Image Rotation

Question

My objective is to rotate an image by a certain angle (e.g. 30 degrees). One possible way of rotating by 90 degrees in OpenCV is given by tenta4 but unfortunately, it only performs 90-degree flips.

Another possible way is a method "SkewGrayImage" given in JavaCV samples where it performs "small angle rotations" that appear to work for rotations of up to approximately 45 - 50 degrees but not for any other higher values.

So - my issues is, is there a proper way/method in OpenCV or JavaCV to actually perform an angular rotation of images or objects?

Answer 1

Meta has explained how to compute a rotation matrix with respect to the center of the image and then to perform a rotation as follows:

    Mat rotated_image;
    warpAffine(src, rotated_image, rot_mat, src.size());