Abstract
An optical image recognition system based on the mechanism of crystal volume holography and wavelet packet compression method is proposed and constructed. Volume holographic associative storage in a photo-refractive crystal has some special properties, which can provide a suitable mechanism to develop an optical correlation system for image recognition. The method of wavelet packet is introduced in this optical system to reduce the number of images stored in the crystal. Through best wavelet packet basis selection, a set of best eigenimages, which will be stored in the crystal as the reference images for recognition, are extracted from a large number of training images. Correlation output between these eigenimages and input ones can be applied for classification and recognition according to the different light intensities of angularly separated beams. Experimental results showed this scheme is practical and can significantly compress the data stored in the crystal while the accurate rate of recognition is still high.
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