Multiplexing optical system and feature vector transformation apparatus using the same; feature vector detecting and transmitting apparatus; and recognition and classification system using these apparatuses

摘要

A multiplexing optical system necessary for transforming input information into effective feature vectors at high speed and with high accuracy, without loss of a spatial frequency component of multiplexed object vector information, for example. Also presented are a feature vector transformation apparatus using the multiplexing optical system, and others. The multiplexing optical system performs a Fourier transform in parallel on multiplexed vector information lying in an input plane (R) as an object to be processed. The system includes a Fourier transform lens (30) for performing a Fourier transform in parallel, and satisfies the condition of (k.sub.R &lgr;f.sub.F /a p) in an arbitrary cross- section containing an optical axis, where k.sub.R is the number of components of each multiplex portion (10, 11) of the multiplexed vector information; p is the pitch between zero-order portions of Fourier transformed information concerning adjacent multiplex portions obtained in the Fourier transform plane (F); a is an effective display size of each multiplex portion; &lgr; is the wavelength of light used; and f. sub. F is the focal length of the Fourier transform lens (30).