OpenCV image recognition - setting up ANN MLP

Question

I am new in OpenCV world and neural networks but I have some coding experience in C++/Java.

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I created my first ANN MLP and learned it the XOR:

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Answer 1

There was a problem in backprop weight scale parameter - it was too big and the ANN couldn't learn more difficult things.

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I changed the line to mlp->setTrainMethod(ANN_MLP::TrainingMethods::BACKPROP, 0.0001); and the hidden layer size to 100 (to speed up the learning) - now it's working!