Study Of Calibration And Splicing Technology Of Coding Optical 3D Measurement System

The three-dimensional measurement based on coded light is an important branch in the field of modern computer vision and has been widely used in many fields.This has led to the rapid development of coded light technology and the goal of improving the measurement precision.The subject of "three-dimensional measurement of light coding system calibration and stitching technology" from the system calibration and system splicing two aspects as the point of failure,in view of the existing technology deficiencies were proposed algorithm to improve the accuracy of the three-dimensional measurement system to improve the encoded light expected.Aiming at the phenomena that the calibration method has the low calibration accuracy due to the anti-interference of the projected pattern,a calibration method combining the vertical and horizontal phase-shift coded light with the planar template is proposed.First of all,it is determined that the camera calibration method in the calibration part of the system is a calibration template based Zhang Zhengyou camera calibration method with high calibration accuracy,and the calibration template is also used as the calibration template of the projector to calibrate the projector together with the vertical and horizontal phase.Then,a system calibration model is established,which in turn tests the camera calibration algorithm and the projector calibration algorithm.The results of the verification experiment show that the maximum relative error of each calibrated parameter and the standard value after calibration is 0.03%,which verifies the correctness of the projector calibration method.Aiming at the phenomenon of system information occlusion and external error superimposed in the system splicing method,the system splicing method based on hexahedral template target is proposed.Firstly,the mathematical model of the stitching principle is strictly deduced to get the stitching algorithm.Then design a color hexahedral template target,and then propose a color correction method for the color distortion existing on the recognition of the target surface.Harris identification algorithm is proposed for target mark point identification.Finally,the system splicing method is simulated.The results of the verification test show that the error after color correction is only 0.01 before calibration,and the recognition degree of the mark corner satisfies the requirement of calibration experiment.The simulation results verify the feasibility of the system splicing method.The related theory of calibration and splicing algorithm in three-dimensional measurement system is verified by experiments.First of all,from the hardware experimental platform to build,the software module to deal with two parts to build three-dimensional measurement of light encoding system.Then,the calibration and stitching algorithms and related theories in the three-dimensional measurement system are verified by experiments The experimental error of the plane measurement of the calibration of the code three-dimensional measurement system is less than 2.9833 mm,which verifies that the calibration method proposed in this paper has high calibration accuracy.Finally,the experimental results were analyzed qualitatively and the experimental data were analyzed quantitatively.By comparing the experiments with accuracy,the error of coincidence degree was reduced by 0.033 mm,which improved the performance of the three-The accuracy of the system splicing and then improve the accuracy of the three-dimensional measurement of the encoded light conclusion.