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Applications of complex filters to realize three-dimensional combined DFT/LDE transfer functions

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2 Author(s)
Bruton, L.T. ; Dept. of Electr. & Comput. Eng., Calgary Univ., Alta., Canada ; Bartley, N.R.

The recently proposed method of combined discrete Fourier transform (DFT)/linear difference equation (LDE) filtering of three-dimensional (3-D) spatio-temporal signals employs LDEs with real coefficients. It is shown that the real-coefficient LDEs impose transfer function symmetries that prevent the 3-D filter from distinguishing between 3-D input signals having reflective symmetry in the direction of the LDE filtering. These transfer function symmetry constraints are relaxed by using complex-coefficient LDEs

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:39 ,  Issue: 6 )