李兴东, 李满天, 郭伟, 陈超, 孙立宁. TOF激光相机六自由度位姿变换估计[J]. 红外与激光工程, 2015, 44(7): 2231-2238.
引用本文: 李兴东, 李满天, 郭伟, 陈超, 孙立宁. TOF激光相机六自由度位姿变换估计[J]. 红外与激光工程, 2015, 44(7): 2231-2238.
Li Xingdong, Li Mantian, Guo Wei, Chen Chao, Sun Lining. Estimating 6 DOF pose transformation of a TOF laser camera[J]. Infrared and Laser Engineering, 2015, 44(7): 2231-2238.
Citation: Li Xingdong, Li Mantian, Guo Wei, Chen Chao, Sun Lining. Estimating 6 DOF pose transformation of a TOF laser camera[J]. Infrared and Laser Engineering, 2015, 44(7): 2231-2238.

TOF激光相机六自由度位姿变换估计

Estimating 6 DOF pose transformation of a TOF laser camera

  • 摘要: 相对位姿估计是机器人视觉领域的研究热点。通过两帧数据来估计相机的六自由度位姿变换。充分挖掘TOF相机优势, 提出了多个有效算法, 用以保证估计精度。采用迭代最近点(ICP)算法估计位姿变换, 为了克服ICP算法迭代发散问题, 利用尺度不变特征点对估计初始值。为了提取有效特征点, 根据统计学原理尺度化灰度图像, 提高图像对比度。为了提高相机的测量精度, 根据曝光时间越长, 测量精度越高的原理, 提出了融合多帧数据算法, 使得融合后的数据帧中每个像素值均是在最长合理曝光时间下采集得到。同时提出了度量两个六自由度位姿变换差异的算法, 并首次利用其跟踪ICP迭代过程。实验证明提出的算法可以有效估计相机六自由度位姿变换。

     

    Abstract: Relative pose estimation is a hot research topic in the community of robotic vision. 6 DOF pose transformation was estimated by two frames data. Several effective algorithms were proposed to guarantee the precision of the estimation which made full used of TOF camera. Iterative Closest Point(ICP) algorithm was used to estimate the pose transformation, in order to conquer the divergence problem of ICP, scaled Invariant Feature Transform(SIFT) feature pairs were employed to compute the initial value for ICP. The contrast of the image was increased for extracting the effective features by scaling the original gray image according to principle of statistics. Multiple frames were fused to improve the accracy of depth measurement based on the fact that the longer the exposure time was, the higher the accuracy was, and every pixels in the fused frame were captured with the longest valid exposure time. A methed for measuring the difference of two 6 DOF pose transformations was proposed, which was applied to track the iterations of ICP. The experiments have demonstrated the effectiveness of the algorithms proposed in this paper.

     

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