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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/802

Title: A non-zero order joint transform correlator for space-variant pattern recognition
Authors: Unnikrishnan, G
Joseph, Joby
Singh, K
Keywords: Optical pattern recognition
Joint-transform correlator
Space-variant pattern recognition
Issue Date: 1999
Citation: Optics Communications, 171(1-3), 149–158
Abstract: We propose a space-variant correlator using a joint transform correlator JTC architecture. The reference and target images of a JTC are modulated by a random phase function which is the sample of a stationary white process ergodic in mean and variance. The degree of shift-variance can be varied by changing the variance of the random phase function. The joint power spectrum JPS is a sinusoidally varying function with a spatially nonvarying average value. This property is advantageous in optical implementations when the JPS is captured by devices such as CCD with a limited dynamic range. The zero-order and the correlations approach delta functions in the correlation plane. By subtracting a constant value equal to its spatial average from the JPS, the undesirable zero-order can be eliminated.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/802
Appears in Collections:Physics

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