4 January 2008 Tracking technology of moving target with optical correlator
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In this paper, we used hybrid optoelectronic joint transform correlator (HOJTC) for recognition of moving target. HOJTC is one of the most successful optical pattern recognizer which is composed of laser, spatial filter, Fourier transform lenses, EALCD (electrically addressed liquid crystal displays) and CCD (Charge Coupled Device). It has many applications in the fields of industry and military affairs. The speed of armored vehicle is generally less than 80 km/h. CCD used as receiver can capture 25 frames per second. The difference caused by shape, scale and rotation always exists between template and target. Therefore, the optical correlator can only detect captured moving target about 3 to 5 serial frames. For some targets in cluttered scene, it even can not recognize the target, which means the tracked target is missing. It shows the influence of clutter and distortion brings great difficulty to correlation recognition. In order to realize scale invariable and rotation invariable, the method of adaptive threshold is applied. After processing the images of moving targets, we can reduce the influence of cluttered background. The effect brought by the changes of shape, scale and rotation is also reduced. Consequently, the ability of automatic recognition, location and tracking of moving target by HOJTC can be enhanced greatly. The experiments are performed to recognize moving tanks with high speed about 70 km/h. The experiments show that more than 80 serial frames can be recognized after target images are processed. The joint transform correlator can recognize even more than 150 frames when the target is in relative clean scene. It has great meaning for target detection and tracking. The conclusion can be drawn that the proposed method of adaptive threshold for moving target is feasible, and it could effectively enhance the ability of automatic recognition and tracking of a moving target.
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Hua Miao, Hua Miao, Yu Chen, Yu Chen, Fanghan Chen, Fanghan Chen, Wensheng Wang, Wensheng Wang, } "Tracking technology of moving target with optical correlator", Proc. SPIE 6837, Information Optics and Photonics Technologies II, 68371H (4 January 2008); doi: 10.1117/12.758033; https://doi.org/10.1117/12.758033

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