New Technique of Image Multiplexing Using Random Diffuser

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Abstract
We describe a new technique of image multiplexing which employs a random diffuser. The same diffuser is used to modulate all of the signals to be multiplexed. The signals are recorded on the same frame, making the entire area of the photographic plate available for all of them. The decoding is done by putting a binary filter in the Fourier plane where each signal produces a system of rectilinear fringes. We get the product of the signal function and the diffuser function as the retrieved image. The maximum number of signals that can be stored without cross talk is a function of the number of exposures for each signal and the interexposure displacement of the signal on the photographic plate. This is limited by the dynamic range of the photographic emulsion and the precision of the displacements of the photographic plate.

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