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基于多域分析和全局优化的全景图拼接方法

DOI: 10.11834/jig.200607167

Keywords: 全景图,图像拼接,相位相关,特征点匹配,粒子滤波,全局对齐

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Abstract:

为了快速鲁棒地进行全景图的拼接,提出了一种基于频率域和空间域特性的全局优化全景图拼接方法。该全景拼接过程分为局部对齐和全局对齐两个阶段。在局部对齐过程中,先使用相位相关法进行粗对齐,而在根据相位相关确定的重叠区域内部,则通过设计一种基于特征点的粒子滤波器来校正相位相关的结果;在全局对齐中,则是使用基于光差的全局优化方法在子像素级进行精确对齐,由于初值准确,因此全局算法能迅速收敛。但是由于全局优化会带来较大的参数空间,为此需使用小局部大全局的策略来降低参数空间。实验表明,该拼接方法在帧间光照变化较大、重叠区域较少、摄像机没有标定的情况下能够鲁棒地完成全景图的拼接。

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