Load custom ArUco dictionary

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Hi,

I'm currently trying to implement an ArUco based tracker using a custom dictionary (3x3 is sadly not provided). So I save my dictionary as a .yml file and load it in my tracking tool.

However, the cv::aruco::detectMarkers function requires a cv::Ptr<cv::aruco::Dictionary> as input but I can only create a cv::aruco::Dictionary object: test_dict = cv::aruco::Dictionary(bits, marker_size, correction_bits);

Some code:

test_dict = cv::aruco::Dictionary(bits, bits, marker_size, correction_bit);
cv::aruco::detectMarkers(cvimage, test_dict, corners, ids);

In the second line, I need a pointer: cv::Ptr<cv::aruco::Dictionary>, but obviously, &test_dict does not work. so my question is how to get such a pointer?

PS: I'm stuck to OpenCV 3.3.1 :)

Best Julz