Interactive reassembly of fractured fragments based on feature points of contour line

Development of ground-based LIDAR measurement system based on BeiDou/GNSS positioning and 5G technologies

“…The time information is obtained through the BeiDou/GNSS receiver. The embedded microcontroller decodes the time information into a timestamp and synchronizes the time information to the LIDAR and the high-precision motor using the self-developed time synchronization module [13][14] . Through the 5G module, the real-time scanning data is sent to the remote terminal, which receives the data and performs multi-frame registration of the point cloud through linear interpolation algorithm points, followed by coarse registration of the multi-station laser point cloud according to BeiDou/GNSS coordinates and fine registration using the Rodriguez matrix to complete the overall registration [15][16][17] .…”

Automatic Reassembly Method of 3D Thin-wall Fragments Based on Derivative Dynamic Time Warping

“…In equation (10), let and . Accordingly, the shape information derivatives and of the sequence B at can also be calculated with equation (2).…”

“…For these partially defective fragments, some domestic scholars proposed a semi-automatic reassembly method. Li Shanshan and Zhou Mingquan, et al [9][10][11] proposed this method. Firstly, it gives the matching feature point pairs according to the subject matter experts, then has the feature point pairs locally grown to produce new ones, and finally determines the adjacency relationship between the contour lines according to the angles and point distances between feature point pairs.…”