Combined calibration method for determining photographing scale after three-dimensional reconstruction

Abstract

Provided in the invention is a combined calibration method for determining the photographing scale after three-dimensional reconstruction. The method comprises the following steps: step one, selectinga scene needing image collection; and step two, setting an image acquisition device, two laser range finders and an angle measurement device in the scene. To be specific, the image acquisition deviceis horizontally fixed in the scene and the laser range finders and the angle measurement device are arranged in front of the image acquisition device; when collection is carried out for the first time, the position level of the image acquisition device is kept, the plane formed by the two laser range finders is in a parallel relationship with the bottom surface of the image acquisition device, and the two laser range finders measure that included angles between the finders and the normal direction AD of the lens of the image acquisition device are alpha and beta by the angle measurement device. According to the invention, A photo pose position parameter and an image control point parameter of a static object can be provided in multi-eye three-dimensional reconstruction; and since the ranging in the process is performed by the laser range finders directly, the precision error occurrence caused by the manual operation is reduced.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a combined calibration method for determining the photographic scale after three-dimensional reconstruction. Background technique [0002] At present, there are various types of image feature matching and 3D reconstruction software at home and abroad, and the application from theory to practice has become increasingly mature, but most of them directly use the photos taken by the camera to perform 3D reconstruction based on the camera coordinate system, such as Smart 3D Capture , Agisoft Photoscan, Visual SFM and other software; Nowadays, people only need to reconstruct the geometric relationship for 3D reconstruction, but now they hope to directly obtain the real size of the project through 3D reconstruction. The software wants to reconstruct the model more accurately or obtain real Model parameters require external orientation elements such as positions and angles in addition to ...

AI Technical Summary

Problems solved by technology

[0012] This method is more complicated to operate, and the cost of the instrument is also higher. The operation of 3D reconstruction of larger objects is more complicated, and the time taken for 3D reconstruction will be longer.

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