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A New Technique for CCD Camera Auto-Calibration
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作者 Xiaodong Zhang, Changku Sun, Zhixiong Wang, Wei Wei State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tainjin, China 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期799-800,共2页
A novel feature-round-based coplanar drone for the CCD camera auto-calibration is designed. Based on the ellipse similarity, an ellipse recognition algorithm is proposed. The experiment indicates the calibration error... A novel feature-round-based coplanar drone for the CCD camera auto-calibration is designed. Based on the ellipse similarity, an ellipse recognition algorithm is proposed. The experiment indicates the calibration error is less than 0.4 pixel. 展开更多
关键词 AUTO CCD A New Technique for CCD Camera auto-calibration for
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Robust DOA estimation and array calibration in the presence of mutual coupling for uniform linear array 被引量:17
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作者 WANGBuhong WANGYongliang +1 位作者 CHENHui CHENXu 《Science in China(Series F)》 2004年第3期348-361,共14页
The presence of unknown mutual coupling between array elements is knownto significantly degrade the performance of most high-resolution direction of arrival (DOA)estimation algorithms. In this paper, a robust subspace... The presence of unknown mutual coupling between array elements is knownto significantly degrade the performance of most high-resolution direction of arrival (DOA)estimation algorithms. In this paper, a robust subspace-based DOA estimation and arrayauto-calibration algorithm is proposed for uniformly linear array (ULA), when the arraymutual coupling is present. Based on a banded symmetric Toeplitz matrix model for themutual coupling of ULA, the algorithm provides an accurate and high-resolution DOAestimate without any knowledge of the array mutual couplings. Moreover, a favorableestimate of mutual coupling matrix can also be achieved simultaneously for arrayauto-calibration. The algorithm is realized just via one-dimensional search or polynomialrooting, with no multidimensional nonlinear search or convergence burden involved. Theproblem of parameter ambiguity, statistically consistence and efficiency of the newestimator are also analyzed. Monte-Carlo simulation results are also provided todemonstrate the effectiveness and behavior of the proposed algorithm. 展开更多
关键词 mutual coupling DOA estimation auto-calibration
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