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The essence of the multi-view alignment is calculated to meet the following objective function of rotational and translational transformation matrix the R, T: which, pi, qi is the point clouds to be aligned, the above equation is a highly nonlinear problems. Point cloud alignment research has focused on the search for the problem fast and effective method for solving the The most famous of which is Basl Mokay in 1992, the ICP algorithm. Point cloud data reduction refers to the point cloud data is huge amounts of data, does not affect the surface reconstruction and to maintain a certain accuracy, the need to streamline the data. Streamlined method can be used in the following ways: average streamline every n points - the origin of the cloud to retain one; streamline distance - delete some point, the distance between the point cloud of the mid-point and point retained some value. It is like the warming up for Laser Pens.
The subject would have to truly restore the scan date with dates, you need to scan data with an accurate surface, this process is called surface reconstruction. Surface common types: triangular meshes, subdivision surfaces, a clear function of the implicit function, parametric surfaces, tensor product B-spline surfaces, NURBS surfaces, the song of the patch. After surface reconstruction, 3D modeling, and restore scanning the subject would have to face day. Point cloud data processing step is basically completed, and can be applied to point cloud data to solve the problem. Three-dimensional laser scanning technology applications: In recent years, the three-dimensional laser scanning technology development and maturing. Slow start of laser pointers is due to the ultra low ambient temperature. Zumba DVD
Terrestrial laser scanner system components with the coordinate system. At this stage, two types of software to make 3D laser scanner to perform its functions: one is the control software of the scanner; other data processing software. The former is usually a scanner that comes with operating software, and both can be used to obtain data, the data can be dealt with accordingly, included with such as Riegi scanner the software RiSCAN Pro; the latter to provide third-party vendors, mainly for data processing. Optech laser scanner data processing software for Polyworks 10.0. Three-dimensional modeling steps: data collected by the three-dimensional laser scanning system for point cloud data. It is independent on the total output power of laser pointers.
Point cloud data processing typically includes the following steps: noise removal, and more depending on alignment, data reduction, surface reconstruction. Removing the noise outside the object to remove the point cloud data scanned data. During the scanning process, due to certain environmental factors, such as moving vehicles, pedestrians and trees, etc., will be the scanner acquisition. These data in the post-processing is necessary to delete. Multi-view align the DUT over a large or complex shape, scan often can not measure all the data required multiple scans from different locations, multi-view point cloud alignment, stitching called multi-view alignment. Point cloud alignment, stitching can be laid in the surface control points of the same name. laser pointers needs some time to preheat.