Mixed Domain Filtering of Multidimensional Signals

Multidimensional filters have applications In such fields as Image, seismic, radar, and sonar signal processing. Such signals may be enhanced by employing the so-called combined DFT/LDE method, which uses the multidimensional discrete Fourier transform (DFT) over some of the dimensions and multidimensional linear difference equation (spatiotemporal) filters over the remaining dimensions. In this contribution, this concept of mixed domain (transform/spatiotemporal) filtering Is extended beyond the DFT to Include other types of discrete sinusoidal transforms, including the discrete Hartley transform and the discrete cosine transform.