Abstract

A new class of optical correlation filters has been implemented experimentally using computer-generated holographic elements. The new filters are formed from a recombination of the angular harmonics of the target image so that the target image can be identified from an infinite set of images of arbitrary position and angular orientation. The computer designed filters have a large amplitude dynamic range and rapid phase variations. Such image functions are difficult to encode in a computer-generated hologram having small quantization and binarization error as well as high diffraction efficiency. Numerical modeling has shown that the filters are robust to amplitude clipping and phase quantization. Filters are being fabricated on a high resolution vector graphics device followed by photoreduction and also on an electron beam system. Various polar and projection CGH algorithms are being compared experimentally in the optical correlation system.

© 1985 Optical Society of America