Holographic intensity correlator with PRIS-type photoelectro-optical controlled transparency

An opto-electronic image recognition system (IRS), in which online entry and preliminary processing were carried out by using a Fototitus-type photoelectrooptical controlled transparency (CT), was considered. The process of processing contour identified images was realized successfully in this system. However, when processing silhouette and half-tone images that comprise most real identified images (industrial features, images of terrain and so on), the dynamic range of the values of the correlation functions decreased significantly due to the low contrast of the produced contours which, in turn, led to a decrease of the reliability of identifying these images. The problem of enhancing the contrast of identified image contours, was solved by using a controlled transparency on the transverse electro-optical effect. As is known, online input and preliminary processing of identified images are carried out in these controlled transparencies within one write-erase cycle of the modulator (instead of two), which provides an additional advantage.