The environment perception and navigation ability of robots are the basis of robot interaction with environment. The scene understanding is the prerequisite of robot autonomous navigation and navigation is the ultimate goal of robot scene understanding, therefore, a mobile robot semantic map navigation system is designed. Firstly, a dense pointcloud map is constructed by using a deep convolutional neural network. Then, the mapping relationship between the depth camera data and the laser data is proposed, for purpose of realizing their interconversion. And a method of constructing two-dimensional raster map by simulating laser data by using the data of the depth camera is proposed. Finally, a method that semantic information is integrated into the two-dimensional grid map is proposed, realizing the semantic navigation of the service robot. The experimental results showed that compared with other robotic navigation systems, the proposed algorithm can better realize the interactions between service robots and people and the environment.
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