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I have to make an application which recognize road signs. I saw that in OpenCV folder there are some XML files for facial recognition but I do not know what that numbers in the XML represents or how they obtained those values. I need to understand this so as I can do my own XML files for road sign recognition.
I do not know much about OpenCV, anyhow I have completed my Final Year Project on Face Recognition using neural networks. Basically I used an algorithm to extract the Facial Portion from a given image. Thereafter I fed that new image (containing only the face) to a neural network that I developed using Matlab. After rigorous improvements, it was a success and by using the Simulation Feature of Matlab it was possible to precisely identify the individual.
Therefore I strongly recommend that you follow the same technique in carrying out this task.
I managed to find some interesting articles related to this topic, here, here , here and here.