Abstract

We propose and demonstrate a method for the dynamic-range compression of images using two-wave mixing in photorefractive materials. This method, in which an image is carried on the signal beam, permits a certain amount of control over the shape of the input and output curves by the variation of the pump intensity, the coupling constant, and the time at which the output image is examined. We also discuss the possible option of adding a feedback loop from the output image so that the range compression can be adapted to suit the intensity profile in the input image.

© 1994 Optical Society of America

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