STDC-SLAM: A Real-Time Semantic SLAM Detect Object by Short-Term Dense Concatenate Network

Abstract

Visual Simultaneous Localization and Mapping (SLAM) plays an important role in computer vision and robotic field. With the development of Convolutional Neural Network (CNN), most scholars currently fuse CNN with visual SLAM to reduce the impact of dynamic objects on visual SLAM. To address the impact of semantic segmentation networks with lower precision and quad-tree algorithm with over-uniform distribution of feature points on the location accuracy of SLAM, we proposed an STDC-SLAM: Short-Term Dense Concatenate Network SLAM, which was based on ORB-SLAM3. In the proposed system, a real-time STDC network was used for semantic thread to segment dynamic objects. On the one hand, we designed a segmentation refinement module to optimize the semantic segmentation maps using images depth information. On the other hand, we improved the Qtree-ORB algorithm by reducing the iterations of low-quality feature points in the rejection thread. We have evaluated our SLAM in public data sheets and compared it with ORB-SLAM3, DynaSLAM, PSPNet-SLAM. Experiments showed that our SLAM improved in localization accuracy compared to DynaSLAM and in processing speed compared to DynaSLAM and PSPNet-SLAM.