Method for adjusting accuracy of area scanning three-dimensional measuring system in real time

Abstract

The invention discloses a method for adjusting the accuracy of an area scanning three-dimensional measuring system in real time. The method includes the steps that first, whether the accuracy of the area scanning three-dimensional measuring system meets the requirement or not can be determined by judging whether the internal and external parameters of a camera meet the current working condition requirement, if the internal and external parameters of the camera meet the current working condition requirement, measuring continues, otherwise, a Levenberg-Marquardt algorithm is used for optimizing the internal and external parameters of the camera, so that the average value of objective functions is made to be minimum, and at the moment, the internal and external parameters of the camera are considered to be optimal; afterwards, whether the average value of the objective functions is smaller than an error threshold value or not is judged, if yes, the optimized internal and external parameters of the camera are used for measuring continuously, and if not, a user is prompted to conduct calibration again. By the adoption of the method, self testing of the accuracy and automatic optimizing of the parameters of the camera can be conducted in real time in an on-line mode, and under the condition that repeated calibration is avoided, the average value of reprojection errors of the camera can be kept at the pixel of about 0.0028 for more than twenty days.

Description

technical field [0001] The invention belongs to the technical field of surface scanning three-dimensional measurement, and more particularly relates to a method for real-time adjustment of the precision of a surface scanning three-dimensional measurement system. Background technique [0002] Calibration accuracy of internal and external parameters of the camera is the key to the 3D measurement system. Due to the complexity of the working environment, the internal and external parameters of the camera are constantly changing due to the influence of the environment, and its accuracy seriously affects and restricts the accuracy of the 3D measurement results of surface scanning. At present, the surface scanning 3D measurement system is more and more widely used in the fields of industrial precision inspection, additive manufacturing, digitalization of cultural relics, medical treatment, 3D photography and other fields. During the use of the system, frequent parameter calibration...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for real-time adjustment of the accuracy of the surface scanning 3D measurement system, which can effectively solve the problems of difficult detection of surface scanning 3D measurement system accuracy and frequent repeated calibration, and can automatically detect surface Whether the accuracy of the scanning 3D measurement system meets the measurement requirements, optimize relevant parameters in real time to maintain the appropriate accuracy of the surface scanning 3D measurement system and reduce the number of recalibration

Images