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    1. POOpenCV OutputArray Heap corruption?
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    1. COThanks for your reply. Your alternative works. But I thought that the point of using OutputArray is that it can deal with either cv::Mat or std::vectors, that's how it's used in OpenCV modules, and in my case I want corners to be a std::vector. It works well if corners is a vector<Point2f>. So I don't understand the difference, I have added a default constructor and copy constructor to my Corner type and see if it makes any difference but it doesn't.
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    2. COHi. If you are interested in going deeper into the rabbit hole, you can take a look at matrix.cpp in OpenCV's source where the OutputArray s declared. Also, you can look at how OpenCV's functions such as split(...) which writes out to vector<>... works BUT I suspect that the OutputArray is somehow only intended to work with a restricted set of templated vectors i.e. vector<Mat>, vector<Point> etc. Let me say tt I'm not entire sure about this but this is the sense I get from taking a quick glance at the code. If I have the time I'll look into it further and let you know.
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    3. COOk, thanks. I've had a look at the InputArray/OutputArray definitions I can see they are templated with parameter _Tp. I haven't been able to see the complete picture but I suspect too that _Tp can be only one of the DataType traits, which are POD types and combinations of them in the form CV_<bit-depth>{U|S|F}C(<number_of_channels>) . So in my case I could use a Vec3f instead of my struct Corner and it would work well. Problem I guess if I wanted two ints and one float type?? It's not obvious from OpenCV documentation that you can't define you own types for this _Tp template parameter.
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