4 January 2008 Enhancement technology of the joint transform power spectrum
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Abstract
The joint transform correlator was an effective system for the target detection and recognition, major character was that the reference template and the target were simultaneous processed; Fourier transform was operated by Fourier transform lens with the speed of light; the joint transform power spectrum was obtained through the first Fourier transform, then got the correlation peaks through the second Fourier transform. The power spectrum of the joint transform correlator was recorded by the Charge Coupled Device (CCD) matrix camera. The contrast of the power spectrum was relatively lower, so some important information, such as the Young's interference fringes, were displayed very fuzzy, even couldn't see in some images, the output correlation peaks were seriously affected. For enhancing the power spectrum's contrast, the power spectrum may be filtered with the high-boost filtering. By filtering, the contrast of the Young's interference fringes was greatly improved and displayed relatively clear, so the contrast of the correlation peaks were greatly enhanced, the recognition ratio of the target detection and recognition by the joint transform correlator was increased. As the experiment examples, the target recognition of a car and a warship in cluttered scenes were presented. The experiments showed that the contrast of the Young's interference fringes was improved after the joint transform power spectrum was processed by the high-boost filtering. At the same time, the output correlation peaks were obviously enhanced too. So the high-boost filtering was very effective method for filtering in the joint transform power spectrum.
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Chunjie Li, Fanghan Chen, Shibo Chu, Jiawei Zhao, Wensheng Wang, "Enhancement technology of the joint transform power spectrum", Proc. SPIE 6837, Information Optics and Photonics Technologies II, 68371E (4 January 2008); doi: 10.1117/12.757513; https://doi.org/10.1117/12.757513
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