| Two three-dimensional decimated uniform DFT-Polyphase filter bank structures are proposed along with two applications: first, the sub-pixel motion discrimination of two-dimensional spatial objects moving with approximately constant local velocity in a noisy three-dimensional spatio-temporal image sequence and, second, the selective filtering of three-dimensional spatio-temporal broad-band plane-waves based on their directions of arrival. The desired three-dimensional filter passband shapes are realized utilizing combinations of highly-selective first-order three-dimensional frequency-planar filters in each band between the analysis and synthesis sections. Measured spatio-temporal performance confirms the high quality broadband transmission of passband signals, high directional selectivity, and low computational complexity. |
