Moving object detection and recognition by using Joint transform correlator

摘要

Optical image recognition is an important branch of optical information processing. It has extensive practical meaning and applied prospects. In recent years, joint transform correlator has taken place of matched filter, and pure optical experiments have developed into optoelectronic hybrid experiments. Optoelectronic Joint transform correlator has not only the optical advantages of parallel processing, large capacity and high speed, but also the advantages of computers, such as flexibility, programmability and accuracy. In this paper, electrically addressed liquid crystal displays (EALCD) are used as space light modulator (SLM), by the use of EALCD and CCD matrix camera which is controlled by microcomputer, and the optical Fourier transform (OFT) system, the moving object is detected and recognized. Because of using CCD matrix camera to detect the power spectrum of OFT, many kinds of digital processing algorithms can be adopted to improve signal noise ration (SNR), and to detect and recognize accurately moving objects.