ABSTRACT
This chapter addresses the necessity as well as the feasibility of image and video data compression. Multidimensional signal processing tools apply to aperture and sensor array processing. Planar sensor arrays can be considered to be sampled apertures. In a broader context, beamforming can be used to separate signals received by sensor arrays based on frequency, wavenumber, and velocity of propagation. The counterpart in aperture and sensor array processing of the use of window functions in spectral analysis for reduction of sidelobes is the use of aperture shading. The combination of individual sensor outputs in a more sophisticated way than the delay-and-sum technique leads to the design of multichannel velocity filters for linear and planar as well as spatial arrays. Line arrays, planar arrays, and volumetric arrays could be either uniformly spaced or nonuniformly spaced, including the possibility of placing sensors randomly according to some probability distribution function.
