OpenCV: how to rotate IplImage?

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If you use OpenCV > 2.0 it is as easy as

using namespace cv;

Mat rotateImage(const Mat& source, double angle)
{
    Point2f src_center(source.cols/2.0F, source.rows/2.0F);
    Mat rot_mat = getRotationMatrix2D(src_center, angle, 1.0);
    Mat dst;
    warpAffine(source, dst, rot_mat, source.size());
    return dst;
}

Note: angle is in degrees, not radians.

See the C++ interface documentation for more details and adapt as you need:

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