Gabor filter bank

Features of this implementation of Gabor:

- has paramaters to control filter size, orientation, postion and frequency
- has ability to compensate DC component
- kernel contains functions to extract amplitudes, phases, real and imag parts
- can show filter bank and responses
- convolution (and feature extraction) can be done by calling only one function

Warning:
requires Matlab >=7.6 (OOP syntax)