Phase-shifting technique applied to circular harmonic-based joint transform correlator |
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Authors: | Jiuhong Guan Zhaoqi Wang Hongli Liu Baolai Liang Guoguang Mu |
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Institution: | (1) Opto-electronic Information Science and Technology Laboratory of the Ministry of Education of China, Institute of Modem Optics, Nankai University, 300071 Tianjin, China |
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Abstract: | The phase-shifting technique is applied to the circular harmonic expansion-based joint transform correlator. Computer simulation
has shown that the light efficiency and the discrimination capability are greatly enhanced, and the full rotation invariance
is preserved after the phase-shifting technique has been used. A rotation-invariant optical pattern recognition with high
discrimination capability and high light efficiency is obtained. The influence of the additive noise on the performance of
the correlator is also investigated. However, the anti-noise capability of this kind of correlator still needs improving. |
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Keywords: | joint transform correlator phase-shifting technique circular harmonic expansion |
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