Laser stepless scale-loaded permanently horizontal compass for SfM three-dimensional modeling

Abstract

The invention discloses a laser stepless scale-loaded permanently horizontal compass for SfM three-dimensional modeling and relates to the technical field of three-dimensional model correction. The laser stepless scale-loaded permanently horizontal compass comprises a telescopic rod and a permanently horizontal compass. The distance between the front end of the telescopic rod and a laser light source is measured by using laser light at the rear end of the telescopic rod; a base of the permanently horizontal compass is a container made of a lightweight pressure-resistant free-deformable material and contains liquid; the compass vertical to a sharp-bottomed upright rod is kept horizontal permanently by using the density greater than that of liquid and the sharp-bottomed upright rod; and theincluded angle between the compass and the telescopic rod is an azimuth angle of the telescopic rod. Compared with an RTK-GPS (real-time kinematic carrier-phase differential technology) coordinate correction method, the permanently horizontal compass disclosed by the invention has the advantages of being light in weight, pressure-resistant and free of a satellite signal, and the stepless scale indesign range is arranged; an SfM three-dimensional model correction method system which is lighter and high in operating environment adaptability and can be dropped is achieved; and the permanently horizontal compass is more suitable for field operations in different environments and can be applied to multiple fields, such as construction, hydraulic engineering, civil engineering, geology, geography and military.

Description

technical field [0001] The invention relates to the technical field of three-dimensional model correction, in particular to a Yongping compass loaded with a laser stepless scale for SfM three-dimensional modeling. Background technique [0002] In the process of using SfM (Structure from Motion, motion recovery structure) to restore fine scene structure and extract information, model size and attitude control are crucial, especially in the field of field operations such as architecture, civil engineering, earth science and military. Because these fields require the correct size, attitude and relative geographical relationship, this is the premise for the correct extraction of geometric parameters in the next step. Usually, if there are no control points in the actual scene, applying SfM to a series of unordered images will generate a dense point cloud in a relative or arbitrary coordinate system, and the point cloud model is scaled and rotated relative to the real world. The...

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Problems solved by technology

For example, place a light-weight plastic plate with orientation and size scales horizontally in the ROI in advance, and since its attitude matrix and the attitude matrix in the model are known, the rotation matrix between the two can be calculated, and then applied to the entire The model can meet the calibration requirements. This method can generate a model within a millimeter error and a five-degree deviation. However, this method can only be placed manually, and the process is more complicated. Therefore, a loading laser for SfM 3D modeling is required. Yong Peng Compass

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