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The article presents a paper which proposes the use of indexed composite filters (ICFs) for multiple pattern recognition. It discusses the advantages of the proposed ICF over the usual composite filters such as its potential for identifying the object of the learning class being detected at the output. The results of computer simulation conducted using alphabetic input scenes illustrating the method's efficiency are also presented.

The article reports on all-optical multifunctional logic gates for image information using photorefractive two-wave mixing. The optical setup is simply configured compared with other all-optical logic gates for image information. The logic operations can be switched by means of the on-off control of the signal and the pump beam illumination. The spatial distribution of beam intensity in the logic gates are analyzed using a finite difference beam propagation method.