基于重投影深度差累积图与静态概率的动态RGB-D SLAM算法

Dynamic RGB-D SLAM algorithm based on reprojection depth difference cumulative map and static probability

为了提高同时定位与建图(SLAM)系统在动态场景下的定位精度和鲁棒性,提出新的RGB-D SLAM算法.建立基于重投影深度差值的累积模型,分割图像的动静态区域;为了避免动态区域过分割,先剔除与匹配地图点欧氏距离过大的动态区域特征点,再根据t分布估计其余特征点的静态概率;将静态区域特征点和动态区域的疑似静态点以不同权重加入位姿优化,得到提纯后的位姿.在公开数据集上的实验结果表明,所提算法在动态场景下较改进前的RGB-D ORB-SLAM2算法的定位精度提升96.1%,较其他动态SLAM算法提升31.2%,有效提高了视觉SLAM系统在动态环境下的定位精度和鲁棒性.

To improve the localization accuracy and the robustness of simultaneous localization and mapping(SLAM) in dynamic scenes, a new RGB-D SLAM algorithm was proposed. Firstly, a cumulative model based on the reprojection depth difference was built to segment the dynamic and static region in the image. Secondly, to avoid over-segmentation, the feature points in the dynamic region whose Euclidean distances were too large from the matching map point were eliminated. The static probabilities of other feature points were estimated according to the t-distribution. Finally, the feature points in the static region and the suspected static points in the dynamic region were added into the pose optimization with different weights to refine the pose. Experiments with public datasets showed that in dynamic scenes, the localization accuracy of the proposed method was improved by 96.1% compared with RGB-D ORB-SLAM2 and 31.2% compared with other dynamic SLAM algorithms. The localization accuracy and robustness of the visual SLAM system in dynamic scenes were effectively improved.