Image multiplexing and color images with theta modulation of the speckle patterns

We describe a technique of image multiplexing which employs theta modulation of the speckle patterns using the same diffuser to modulate all the signals. This technique is applicable for binary signals. The basic advantage of this technique is that a great number of signals can be stored without cross-talk, because each area of the film is exposed only once. In addition to this, if the development film is processed with white light, color images of the signals will be retrieved.