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http://hdl.handle.net/2074/802
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| 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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| unninon1999.pdf | | 1703Kb | Adobe PDF | View/Open |
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