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基于弦高点和遗传算法的仿射配准

DOI: 10.3724/SP.J.1004.2013.01447, PP. 1447-1457

Keywords: 仿射配准,LTSHausdorff距离,遗传算法,弦高点

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Abstract:

?针对复杂场景中目标由于成像畸变、部分遮挡和局部缺失难于识别的难题,提出了一种新的特征点——弦高点,将其和遗传算法相结合用于图像的仿射配准.算法首先给出了弦高点的定义,并证明了其仿射不变性;然后,应用遗传算法搜索模型和目标轮廓上两对对应点,以弦高点作为第三对对应点,求解最优的仿射变换矩阵;最后,对遗传算法搜索的结果再进行线性搜索,提高配准的精度.本文利用LTSHausdorff距离(LeasttrimmedsquareHausdorffdistance,LTS-HD)进行度量,能有效克服部分遮挡或局部缺失的影响.由于采用遗传算法,并只需搜索两对对应点,配准的速度得到提高.理论分析和实验结果均表明,该算法能有效地进行仿射配准,并能处理部分遮挡或局部缺失.

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