A novel 3D reconstruction method with a binocular-line laser system

•A novel 3D reconstruction method with a binocular-line laser system is proposed.•The problem of single-line laser multi-angle localization is solved by using a spherical 3D target.•Accurate matching of homologous point pairs of target libraries and current frames is achieved by spatial invariance of marker points.•Global data harmonization has been achieved through the establishment of an intermediate transition coordinate system.•Low-cost, high-precision multi-angle 3D reconstruction measurements are realized. The accuracy of 3D reconstruction will be reduced due to sensor occlusion or tracking failure when it comes to complex structural measurement. To overcome this problem, a novel 3D reconstruction (NR) method is proposed based on a binocular-line laser and a stereo target. First, the coordinate system of a stereo target (TCS) is calibrated by the global photogrammetry method. Second, the marks on the stereo target are identified by using an image grayscale processor to locate its coordinates in the camera coordinate system (CCS). Third, TCS and CCS are matched and localized through distance iteration and singular value decomposition (SVD). Fourth, the point cloud is stitched by coordinate transformation between the CCS and global coordinate system (GCS). The experimental results show that the MAE of the suggested NR method is 0.051 mm, and the maximum measurement SD is 0.172 mm. The NR method is superior to previous planar target location measurements.