Reconstruction And Evaluation Based On Image Edge Feature For Space Target

The target image sequence can be obtained by observing the space target by the onorbit optical camera load,and reconstructing the three-dimensional structure of the target by using the image will be extremely important for the subsequent on-orbit service,maintenance operation,and precision strike.Therefore,it is of great theoretical significance and application value to carry out accurate research on three-dimensional reconstruction methods of spatial targets.In this thesis,based on the acquired multi-angle sequence images of spatial targets,the three-dimensional reconstruction of spatial target contours is realized.The research work is as follows.Firstly,edge feature extraction is performed to obtain the edge segment features of the image.This thesis uses Line Segment Detection(LSD)to obtain the endpoint information of multiple straight segments in the image.According to the similarity between line segments,the line segments are merged and optimized.The intersection points are located according to the geometric characteristics of the line segments.The symmetry of the space target structure is used to reasonably estimate and fill the results,and a more complete and accurate spatial target edge contour detection result is formed.Secondly,after obtaining the line segment information in the target image,this thesis describes the feature based on the Line Band Descriptor(LBD)and constructs the multidimensional feature information of the line segment.Line features are matched between different images to form matching line segment pairs.The matching endpoints are selected from the matching line segment pairs,and the camera pose is solved by the Structure From Motion(SFM)algorithm.Then,a series of point pairs are generated by matching line pairs,and their corresponding three-dimensional coordinates are solved.The reconstructed point cloud is the three-dimensional reconstruction contour point of the target edge line,and is the three-dimensional information of the target with structural features.Finally,in order to measure the quality of reconstruction results,this thesis studies the evaluation methods of 3D reconstruction results.From the perspective of edge reconstruction contour,this thesis proposes two algorithms called contour completeness and proportional consistency to form a relatively complete system for evaluating 3D reconstruction results.