Three-dimensional contour measuring method based on structured light field imaging

Abstract

A three-dimensional contour measuring method based on structured light field imaging is characterized by including the steps that an imaging system composed of a light field camera and a projector isestablished, the projector projects an original coding grating to a to-be-measured object, the light field camera shoots a coding grating image obtained after being subjected to contour modulation ofthe to-be-measured object, and the coding grating image which is shot by the light field camera and is subjected to contour modulation of the to-be-measured object is decoded, and three-dimensional reconstruction is carried out on the contour of the object according to the information obtained after decoding; a three-dimensional contour measurement problem is summarized into three equations for solving three unknown numbers containing object point three-dimensional coordinates, wherein after the imaging system is calibrated, two equations are determined by using the process that the to-be-measured object is imaged in a center sub-aperture image in the light field camera, the third equation is determined by using the decoded image information, and three-dimensional contour measurement is achieved by solving an equation set formed by the three equations.

Description

technical field [0001] This paper involves 3D imaging technology, especially a 3D profile measurement method based on structured light field imaging, which can be used in many fields such as automation, industrial inspection, and medical inspection. Background technique [0002] Three-dimensional profile measurement technology is divided into contact and non-contact measurement, and non-contact measurement is divided into active measurement and passive measurement. Active measurement methods include structured light, laser triangulation, etc. Among them, phase measurement profilometry is a three-dimensional profilometry technology based on the structured light method. This technology first projects a structured grating onto the surface of the object, and secondly uses a traditional camera to capture the grating fringe pattern modulated by the surface contour of the object, and then conducts the grating fringe pattern The wrapped phase is obtained through processing, the unw...

AI Technical Summary

Problems solved by technology

Phase measurement profilometry is characterized by high precision, but it is difficult to achieve real-time measurement, while traditional unwrapping algorithms: genetic algorithm, multi-frequency heterodyne, etc., these algorithms cannot realize real-time measurement of 3D contour

Passive measurement methods include stereo vision methods, etc., which have the advantages of light structure and rapid data acquisition, but their stereo matching accuracy and loss of light information lead to poor 3D reconstruction accuracy.

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