how to extract gabor feature using opencv?

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This is nice! Since when this function exists?

a good year or so.

What are you supposed to do with dest to get a feature out of it. I though you had to sum the squares of the pixel values to get the 'Gabor energy', however, this seems to loose the sign of the Gabor filter, see my question here: http://answers.opencv.org/question/42056/does-using-gabor-energy-disregard-the-sign-of-the/

@_Robert, no idea, what you want from the energy, i.e i use the filtered dest img to get an lbp histogram (use it as an edge filter), [well a bank of 4 filters, and concatenate the resulting histograms]

@berak could you post somewhere a piece of code with getting lpb histograms? I don't know how to connect gaborFilter output with features extraction...

@Areano, maybe similar to this one ? (you'll probably want a more 'rectangular' grid for your iris example)

@berak thank you very much for your respone. Really appreciate it.

@berak in the begining, I want to apologize for disturbing you, but I have a question - It will be okay if I just replace your square grid to rectangular one? For example 16x8? I really don't get it. :(

@Araneo, yes, definitely , for your iris case you'd wnat/need a rectangular one.