共查询到17条相似文献,搜索用时 140 毫秒
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针对机载多平台多传感器系统误差配准过程中出现的系统误差参数未知问题,本文提出了一种基于期望最大化(EM)与容积卡尔曼平滑器(CKS)的机载多平台多传感器系统误差配准算法.该算法将传感器的量测系统误差视为系统待估计的未知参数,构建了新的传感器量测方程.引入EM算法框架,在期望步(E–step)利用容积卡尔曼滤波器(CKF)和CKS近似计算对数似然函数的数学期望,在最大化步(M–step)对该数学期望进行最大化处理,最后通过解析更新反复迭代的方式获得各传感器系统误差的参数估计.数值仿真验证了本文提出算法的有效性. 相似文献
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坐标配准是协同定位的重要组成部分,一个合理的坐标配准体系可以体现协同定位算法的性能,否则可能会放大定位算法的误差。本文详细比较了基于最小二乘 (least square, LS)与基于普氏分析(Procrustes analysis, PA)的配准方法的设计思想、适用条件,并给出了基于普氏分析的坐标配准算法的详细步骤。利用协同定位算法(经典MDS和Levenberg–Marquardt算法)得到的实验数据,详细分析了锚节点数量、测距误差、网络节点平均连通度对配准精度的影响。实验表明,在2D和3D环境中,基于普氏分析的配准算法,其配准精度和稳定性都优于最小二乘法,配准误差降低约为20%。 相似文献
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The registration of images from multiple types of sensors (particularly infrared sensors and visible color sensors) is a step toward achieving multi-sensor fusion. This paper proposes a registration method using a novel error function. Registration of infrared and visible color images is performed by using the trajectories of moving objects obtained using background subtraction and simple tracking. The trajectory points are matched using a RANSAC-based algorithm and a novel registration criterion, which is based on the overlap of foreground pixels in composite foreground images. This criterion allows performing registration when there are few trajectories and gives more stable results. Our method was tested and its performance quantified using nine scenarios. It outperforms a related method only based on trajectory points in cases where there are few moving objects. 相似文献
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Towards a general multi-view registration technique 总被引:12,自引:0,他引:12
Bergevin R. Soucy M. Gagnon H. Laurendeau D. 《IEEE transactions on pattern analysis and machine intelligence》1996,18(5):540-547
We present an algorithm that reduces significantly the level of the registration errors between all pairs in a set of range views. This algorithm refines initial estimates of the transformation matrices obtained from either the calibrated acquisition setup or a crude manual alignment. It is an instance of a category of registration algorithms known as iterated closest-point (ICP) algorithms. The algorithm considers the network of views as a whole and minimizes the registration errors of all views simultaneously. This leads to a well-balanced network of views in which the registration errors are equally distributed, an objective not met by previously published ICP algorithms which all process the views sequentially. Experimental results show that this refinement technique improves the calibrated registrations and the quality of the integrated model for complex multi-part objects. In the case of scenes comprising man-made objects of very simple shapes, the basic algorithm faces problems common to all ICP algorithms and so must be extended 相似文献
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针对小卫星独立相机多光谱成像系统波段间配准的非线性误差问题,提出了一种多光谱图像波段间自动配准算法,该算法综合利用互信息、遗传算法和MQ几何校正模型进行多光谱图像的自动配准。在算法中,以互信息作为配准的相似性度量,获得了很高的配准精度;利用遗传算法的快速搜索特性,可以较快的完成搜索并获得整体的最优解;利用MQ几何模型可以精确的建立图像之间的几何关系。试验表明该算法对于多光谱图像波段间非线性几何关系,能够取得非常高的波段间自动配准精度,整体配准误差在一个像元以内。 相似文献
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提出了一种基于二次误差的特征描述子,该特征描述子具有旋转不变性。通过提取点的二次误差和邻域点二次误差得到两种特征描述子。基于高斯混合模型的点云配准算法层出不穷,主要原因是概率模型在噪声和离群值方面具有更好的鲁棒性,然而该类方法对于尺度较大的旋转表现并不好,为此将二次误差特征描述子作为高斯混合模型的局部特征优化了高斯混合模型较大旋转中的配准效果,并提出基于双特征的配准策略优化了单一特征的缺陷。通过实验与鲁棒的ICP(iterative closest point)以及流行的基于特征的配准算法在配准效率和配准精度方面进行对比,效率是鲁棒性ICP的3~4倍。在大尺度的旋转中提出的算法具有良好的鲁棒性并且优于大多数流行的算法。 相似文献