Multi-angle three-dimensional contour measuring system and measuring method

Abstract

The invention discloses a multi-angle three-dimensional contour measuring system and measuring method. The method comprises steps of: 1) acquiring three regions to reconstruct the coordinate transformation relation of a model by using three-dimensional calibration technique for the point cloud splicing; 2) projecting coded structured light and acquiring a structured light picture modulated by a measured object; 3) performing matching in order to solve parallax; 4) performing three-dimensional reconstruction, obtaining the three-dimensional contour of the front surface and the left and right side surfaces of the measured object; 5) performing point cloud low-precision splicing to get the low-precision multi-angle three-dimensional contour of the measured object; 6) performing high-precision splicing by using ICP to ultimately get high-precision multi-angle three-dimensional contour of the measured objects. The multi-angle three-dimensional contour measuring system can obtain the accurate three-dimensional model of the measured object in 360 degrees under the condition that the measured object and a measuring angle are fixed, and has the advantages of simple structure, high measurement precision, large field of view and fast speed.

Description

Technical field: [0001] The invention belongs to the field of optical detection, and relates to a three-dimensional contour multi-angle optical detection system and detection method, in particular to a structured light three-dimensional measurement method with a large depth of field, multiple angles and a large field of view. Background technique: [0002] Three-dimensional scanning technology is more and more widely used. In order to realize fast and accurate three-dimensional measurement of objects, the stereo vision method of multi-camera shooting and the structured light method of fringe projection are usually used. The traditional phase-shift profilometry method can measure objects with any curved surface shape and has a wide measurement range, but this method has calibration difficulties and reflectivity problems; the binocular stereo vision method has a simple measurement system but has problems with matching difficulties. If these two methods are combined, using the ...

AI Technical Summary

Problems solved by technology

[0003] At present, due to the limitation of the angle between the cameras of the binocular stereo vision measurement system, only an accurate 3D model within 90 degrees of an object can be obtained

In actual use, it is usually necessary to measure the same measurement object multiple times at different angles, and then stitch the obtained 3D contour models, which is time-consuming and laborious

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