Research on Underwater Laser Line Scanning Fast Three-Dimensional Imaging Technology Based on Cross Line Constrained Interpolation

As a three-dimensional imaging technology, laser line scanning technology has been widely used in undersea target detection and topographic mapping. Scanning speed is an important factor affecting the imaging accuracy of line scanning during the dynamic scanning process, and a fast, stable and accurate interpolation method is needed for encrypting the point cloud under fast scanning and imaging. In this paper, a point cloud interpolation method with cross-laser line constraints is proposed for the problem of missing point clouds under fast scanning, which utilizes the points on the cross-laser line as constraints, and interpolates the point cloud by branch-and-branch interpolation and moving least squares with constraints. The cross-laser constraint-based point cloud interpolation method is validated in the laboratory using barbell pieces and scallops as targets, and the overall accuracy of the cross-laser constraint method is improved by about three times compared with single-line interpolation when scanning against barbell pieces and scallops. The results show that the method can effectively improve the measurement accuracy and the degree of target morphology restoration, which is conducive to the realization of high-resolution underwater fast 3D imaging.