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Three-dimensional non-contact scanning method using positive and negative Gray code line shift grating

A technology of Gray code line and scanning method, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of three-dimensional point cloud layering, etc., to improve the splicing efficiency, suppress the interference of background light and local diffuse reflection light, Solve the effect of large contrast between light and dark

Inactive Publication Date: 2019-05-14
VISION SENSITIVE TECH CO LTD
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Problems solved by technology

If this step is not done properly, 3D point cloud stratification will occur throughout the subsequent stitching process

Method used

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  • Three-dimensional non-contact scanning method using positive and negative Gray code line shift grating
  • Three-dimensional non-contact scanning method using positive and negative Gray code line shift grating
  • Three-dimensional non-contact scanning method using positive and negative Gray code line shift grating

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Embodiment Construction

[0022] The structural block diagram of the system structure of the three-dimensional non-contact scanning method using positive and negative Gray code line-shifting gratings used in the present invention is shown in Figure 2, wherein the image acquisition unit is composed of two industrial CCD cameras and one stripe grating generator. The entire scanning system is controlled by a computer, and the fringe light of different resolutions is projected onto the surface of the object to be measured through the fringe grating generator. At the same time, the computer controls two CCD cameras to synchronously collect the positive and negative code fringe images projected each time to form a Gray Space-time coding, the computer will calculate the three-dimensional space coordinates of the measured object according to the positions of the two image pixels with the same name phase (that is, the gray space-time code is the same) and the relative positions of the two CCD cameras.

[0023] T...

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Abstract

The invention belongs to the technical field of active grating image three-dimensional reconstruction, and relates to a three-dimensional point cloud non-contact scanning method. A grating generator is used for projecting a stripe grating, and two CCD cameras are used to collect images. The method comprises the steps of carrying out single-side image collection on a measured object; performing Gray space-time positive and negative coding on an image of stripe structure light projected to the surface of the measured object by means of phase information of the stripe light; calculating spatial three-dimensional coordinates of the measured object according to the same-name phase positions of each pair of image pixels and the relative positions of the two pre-calibrated CCD cameras; calculating texture information of the three-dimensional coordinate points of the measured object by utilizing a three-dimensional space linear interpolation method; performing feature extraction; according tothe calculated three-dimensional coordinates, forming single-side point cloud data; and according to a texture or a mark point of the measured object, performing point cloud fusion splicing to form amulti-side point cloud. The three-dimensional non-contact scanning method using the positive and negative Gray code line shift grating has the advantages of being simple to operate and high in precision.

Description

technical field [0001] The invention belongs to the technical field of image three-dimensional information reconstruction, and relates to a three-dimensional non-contact scanning method using positive and negative Gray code line-shifting gratings. Background technique [0002] The three-dimensional non-contact surface fringe raster scanning measurement technology has great advantages such as simple operation, fast measurement speed and high precision. It is a technology widely used in the fields of advanced manufacturing technology and innovative creative design. The non-contact scanning method has been widely used in many fields such as industrial inspection, reverse engineering, human body scanning, cultural relic protection, clothing, shoes and hats. The fringe raster scanning measurement method belongs to the category of phase measurement profilometry, and the Gray code phase shift method is a commonly used auxiliary phase solution method. The Gray code method mainly re...

Claims

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Application Information

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IPC IPC(8): G01B11/24
Inventor 马杰
Owner VISION SENSITIVE TECH CO LTD
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