Three-dimensional measurement system and method for obtaining actual 3D texture point cloud data

Abstract

The invention discloses a three-dimensional measurement system and a method for obtaining actual 3D texture point cloud data. The method includes the following the steps that S1, an image I1 generated when a laser is lighted up and an image I11 generated when the laser is turned off are obtained; S2, image processing is conducted on locking imaging obtained by the image I1 and the image I11, and a binarization contour line l1 (u, v) is obtained; S3, a gray level curve h (u, v) corresponding to the l1 (u, v) is obtained when no laser exits, an actual map of an object in one cross section of a three-dimensional space is restored and obtained by restoring the h (u, v); S4, the S1, S2 and S3 are executed repeatedly, and a series of contour lines including the gray level information are obtained; S5, the point cloud data including the gray level information are obtained, and the point cloud data are reconstructed to form a three-dimensional digital model including surface texture information through a three-dimensional surface contour reestablishment technology. According to the three-dimensional measurement system and the method for obtaining the actual 3D texture point cloud data, texture mapping and three-dimensional model reestablishment are combined, the three-dimensional model including the actual surface texture of material objects is obtained by reconstruction, a single pixel contour line obtained through locking imaging is mapped to the gray level image obtained without laser lighting, and the texture mapping accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a three-dimensional measurement system and a method for obtaining real 3D texture point cloud data. Background technique [0002] With the rapid development of machine vision, 3D measurement and computer graphics, 3D measurement of objects has become a research hotspot because of its wide application value. The optical three-dimensional measurement technology based on laser scanning can easily obtain and display the real geometric contour structure of the object surface, but the displayed three-dimensional image is generally a mesh and point structure, which can only reflect the geometric contour of the object and cannot reflect the real texture of the object surface Variety. In many applications, it is hoped that the displayed 3D image can not only reflect the geometric structure of the object, but also reflect the real texture and even color of the object surface. Fo...

AI Technical Summary

Problems solved by technology

Generating a realistic 3D model involves several challenging issues: acquisition of depth images and texture images, system calibration, matching of depth images, fusion of depth images, mapping of texture images and depth images, 3D model reconstruction, etc.

However, there are two disadvantages: (1) The texture mapping is realized by not fixing the camera position, the camera parameters need to be estimated, and the accuracy is restricted, and error estimation and compensation must be performed to improve the mapping accuracy; (2) 3D mesh model It is stored separately from the 2D texture image, and the 3D model with texture is generated through texture mapping, which is a simulation of the texture of the 3D model, not a true restoration of the surface texture of the model

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