One of the only reasonable defenses I know of (assuming that your picture is already stored in the attacker's db) is this https://cvdazzle.com/.
Even so, it doesn't scale well, given that you do not have the guarantee to fool more than a given set of algorithms (the technique above targets specifically OpenCV haarcascade face detection algorithm).
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[ 3.0 ms ] story [ 12.8 ms ] threadEven so, it doesn't scale well, given that you do not have the guarantee to fool more than a given set of algorithms (the technique above targets specifically OpenCV haarcascade face detection algorithm).