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Gabor filter implementation


I'm asking for a little help with implementing Gabor filter on fingerprint image. I'm computing the kernel in similar function like this. Than I'm applying it to smaller blocks of picture made with ROI and using the orientation in blocks as "theta" parameter and using the kernel with filter2D when visualizing it. So my question is: Can I somehow apply it to the whole picture pixel-by-pixel with theta parameter as orientation of pixel? I hope my question is clear :) Thank you!