Three-dimensional imaging scanning system based on combined lens group and point cloud registration method

Abstract

The invention discloses a three-dimensional imaging scanning system based on a combined lens group and a point cloud registration method. The three-dimensional imaging scanning system sequentially comprises a projector, a combined lens, a beam expander, a measured object, a medium high-reflectivity mirror and a CCD camera according to an optical path. The combined lens sequentially comprises a polarizer, a protective film, a polarizer, a polarizing prism, a quarter-wave plate, an antireflection film and pyramid prisms arranged on the two sides of the combined lens. According to the invention,the problem that the structured light three-dimensional scanning system is easily influenced by factors such as visual field and natural light when acquiring image information, resulting in reductionof accuracy and definition of the acquired information, can be solved, and the definition and integrity of the scanning system for acquiring the three-dimensional data of a to-be-measured object are improved. In order to solve the accuracy problem of the point cloud registration method based on the feature key points, the invention provides a double-dimensional three-screening point cloud registration method, two-dimensional and three-dimensional information of the point cloud is fused, and accurate and efficient three-dimensional point cloud registration is realized by combining image features and geometrical features of the point cloud.

Description

technical field [0001] The invention relates to a three-dimensional imaging scanning system based on a combined lens group and a point cloud registration method, belonging to the technical field of additive manufacturing. Background technique [0002] The use of optical technology to obtain 3D information of objects is a research hotspot in the field of additive manufacturing, and the requirements for the accuracy and speed of object 3D information acquisition are getting higher and higher. Among them, the use of grating projection measurement is currently the main method for obtaining 3D data. This method can quickly obtain the 3D coordinate information of the object surface by collecting the changes of the grating light projected on the object, and establish a 3D point cloud of the measured object. Model. Chen Yi and others designed a scanning system that can accurately extract the three-dimensional contour information of the object surface (Chen Yi, Yang Haima, Xu Yuting...

AI Technical Summary

Problems solved by technology

[0003] Due to the influence of factors such as field of view, natural light, and external ambient light, the accuracy and clarity of the image information collected by the 3D scanning system will be reduced, so that it will affect the final acquired point cloud data

In addition, due to light reflection, scattering and angle problems, the light on the surface of the measured object cannot be completely collected by the camera, resulting in the loss of image information and point cloud data

Considering the overall accuracy of 3D point cloud registration, matching point pairs described only by image feature points is not enough

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