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Spatial multichannel technique to extend synthetic discriminant function (SDF) distortion-invariant range in the real-time hardware optical implementation system

A SDF (Synthetic Discriminant Function) could not cover a large distortion range to ensure a good correlation S/N with training images. There exists a limitation for the training image number of a SDF. To extend the distortion range of SDF hardware implementation system, a new spatial multichannel technique was proposed. A multiplex SDF real-time 3D distortion-invariant spatial filtering was realized using holographic technique by means of a special phase grating, a high correlation S/N, very good abilities of intraclass recognition and clutter rejection were got, multiobject tracking and shift invariant abilities were kept. The 3D object OPR (Optical Pattern Recognition) distortion-invariant range was extended greatly. This technique could be applied to practical machine vision purpose.