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16 September 2002 Distortion-invariant color image recognition by the joint transform correlator with a real-valued reference function
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Abstract
A novel phase-encoded amplitude-modulated joint transform correlator (PAJTC) technique is presented, which yields superior output correlation signals and better noise robustness than a classical JTC. In the proposed PAJTC technique, firstly, the input targets are encoded with an application of a phase mask, and then the joint power spectrum (JPS) is multiplied by an amplitude-modulated filter (AMF) of the reference object before the inverse Fourier transforming. An enhanced amplitude-modulated filter, in which the modulation factor varies according to the noise presented in the input scenes, is used in the PAJTC technique. The PAJTC technique eliminates extraneous signals especially for the JTC with multiple input targets. An optoelectronic implementation schematic diagram for the PAJTC technique and computer simulations of the performances of the classical JTC and the PAJTC for comparison are presented.
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Chulung Chen and Wei-Jun Wu "Distortion-invariant color image recognition by the joint transform correlator with a real-valued reference function", Proc. SPIE 4929, Optical Information Processing Technology, (16 September 2002); https://doi.org/10.1117/12.483223
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