Visual-receptive-field model based on the Zak transform
Izidor C. Gertner, George A. Geri · 1993
Since Gabor functions do not form an orthogonal basis, a biorthogonal auxiliary function is required to determine expansion coefficients. A computationally efficient, 4-D FFT algorithm, based on the Zak transform, has previously been developed1 to calculate Gabor coefficients.