RANDOM-PHASE ENCODING OF COMPOSITE FULLY COMPLEX FILTERS

The mapping of complex-valued functions onto phase-only spatial light modulators is examined. Random phase encoding effectively adds amplitu de control to the phase-only filter and can be used to trade off syste matic errors of the phase-only filter for random errors. This is illus trated for the problem of recognizing a three-dimensional object from arbitrary views. The complex-valued composite filters that constitute a filter bank design are encoded by phase-only and pseudorandom method s. The best recognition probabilities are achieved by blending the two methods so that only the smallest amplitudes are randomly encoded. (C ) 1996 Optical Society of America