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If I is a reference to an entry of the vector<> you will always get trouble if the vector<> is reallocating e.g. if getting bigger. I do not think that this has got something to do with the thread safety of the Mat methods. If you protect your vector<> by mutex and take a deep copy of Mat (e.g. by clone() or copyTo()) it works like a charm. I use something very similar to distribute the processing of video frames to a bunch of threads without problems.
