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Three-dimensional reconstruction accuracy improvement method and device based on laser grating scanning

A technology of three-dimensional reconstruction and raster scanning, which is applied in the field of laser scanning, can solve problems such as errors, and achieve the effects of improving accuracy, reducing measurement errors, and reducing noise or discontinuity

Inactive Publication Date: 2019-05-24
QINGDAO XIAOYOU INTELLIGENT TECH CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for improving the accuracy of three-dimensional reconstruction based on laser raster scanning, aiming to solve the shortcomings of grating profilometry in actual measurement in the prior art, and reduce the use of Fourier in traditional grating projection. Solving the Problem of Errors Caused by Phase by Leaf Transformation Contour Method

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  • Three-dimensional reconstruction accuracy improvement method and device based on laser grating scanning
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  • Three-dimensional reconstruction accuracy improvement method and device based on laser grating scanning

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[0025] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0026] Such as figure 1 As shown, a method for improving the accuracy of 3D reconstruction based on laser raster scanning, the method includes the following steps:

[0027] S1: Load the required dual-frequency fringe code into the control panel of the MEMS micro-galvanometer, so that the optical machine scans with the required dual-frequency fringe;

[0028] S2: The opto-mechanical scanning triggers the binocular stereo vision camera to capture the dual-frequency fringes changed by the surface shape of the object;

[0029] S3: Dephase and phase unwrap the grating fringe image containing the surface shape information of the object, and use the phase information to perform stereo matching on the left and right images to obtain a disparity...

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Abstract

The invention provides a three-dimensional reconstruction accuracy improvement method and device based on laser grating scanning. The method includes the steps: encoding needed double-frequency stripes, loading the encoded double-frequency stripes into an MEMS (micro-electro mechanical system) micro vibration mirror control panel, scanning the panel by an X-ray machine according to the double-frequency stripes, and triggering the binocular stereoscopic camera to shoot the double-frequency stripes changed by an object surface shape by scanning of the X-ray machine; performing phase unwrapping on grating stripe images containing object surface shape information, and stereoscopically matching the left images and the right images by the aid of phase information to obtain parallax maps; calculating point cloud data for describing target object surfaces based on three-dimensional measurement principles according to binocular calibration results. Principal value phase image noise or discontinuous conditions are decreased, accuracy of an unwrapped phase is improved, the difference between two groups of initial phases is designed into 45 degrees by projecting two groups of four sinusoidal grating stripe images, a four-step phase shift algorithm is executed twice to obtain two principal value phase images, measuring errors can be greatly reduced, and the method can be effectively used for actual measurement.

Description

technical field [0001] The invention belongs to the technical field of laser scanning, and in particular relates to a method and device for improving the accuracy of three-dimensional reconstruction based on laser raster scanning. Background technique [0002] Optical 3D vision technology has the characteristics of high precision, fast acquisition speed, and non-contact. The high brightness and good beam quality of laser make it a more advantageous light source in optical 3D measurement. On the basis of the development trend of the existing laser technology, the promising fringe projection technology is selected as the basis for three-dimensional measurement, which overcomes the shortcomings of the traditional grating profilometry in actual measurement, and reduces the number of solutions using the Fourier transform contour method in the traditional grating projection. The phase brings errors and is better used in actual measurement, which is an urgent requirement for 3D vis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 李虹杜先鹏郭俊兴代启强周印伟
Owner QINGDAO XIAOYOU INTELLIGENT TECH CO LTD
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