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I am trying to develop a fingerprint system using OpenCV 2.4.3 and C++ in Visual Studio 2010. I need to form the orientation map of the input fingerprint in order to use it in Gabor filters. I have computed the gradient x and y values using Sobel filters. But I don't how to form a orientation map from this. Can anyone help me with the steps to do so. Thanks in advance.

I am trying to develop a fingerprint system using OpenCV 2.4.3 and C++ in Visual Studio 2010. I need to form the orientation map of the input fingerprint in order to use it in Gabor filters. I have computed the gradient x and y values using Sobel filters. But I don't how to form a orientation map from this. Can anyone help me with the steps to do so. Thanks in advance.