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Hybrid Optical/Electronic Pattern Recognition With Both Coherent And Noncoherent Operations

A system approach to correlation-based rotation and scale invariant pattern recognition is described. Familiar operations such as the coherent optical Fourier transform and noncoherent correlation are included in a concept which is strongly influenced by the need for practical manufacturing techniques. There is merit in amplitude-only filtering for noncoherent correlation, and matched filtering diffraction effects are not severe. Emphasis for innovation is on electronic subsystems. A digital remapper and analog correlation field processor are discussed. Analysis leading to a prediction of several thousand frames per second is summarized.