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Method for measuring unevenness of glass plate by combining single camera with two-dimensional code

A two-dimensional code and glass plate technology, applied in the field of visual measurement, can solve the problem of large volume of the measurement system

Active Publication Date: 2019-09-24
HEFEI UNIV OF TECH
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  • Abstract
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Problems solved by technology

When using a binocular camera for measurement, there are certain requirements for the placement of the two cameras, which will make the entire measurement system larger

Method used

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  • Method for measuring unevenness of glass plate by combining single camera with two-dimensional code
  • Method for measuring unevenness of glass plate by combining single camera with two-dimensional code
  • Method for measuring unevenness of glass plate by combining single camera with two-dimensional code

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Embodiment Construction

[0081] like figure 1 As shown, a method for measuring the unevenness of a glass plate with a single camera combined with a two-dimensional code includes the following subdivision steps:

[0082] Step 1: Camera Calibration

[0083] The camera calibration of the present invention adopts Zhang Zhengyou's two-dimensional target calibration method. The entire working range is set to 1-3m. In order to meet the measurement requirements, after considering the field of view, focal length and other parameters, a CMOS industrial digital camera with a USB2.0 interface and a fixed focal length lens with a focal length of 16mm are selected.

[0084] Step 1.1 see figure 2 As shown, the mapping relationship between the two-dimensional coordinates and the three-dimensional coordinates is established, and the imaging position of any point P in the space can be approximated by the pinhole model.

[0085] The homogeneous coordinates of the space point P in the world coordinate system and the ...

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Abstract

The invention discloses a method for measuring unevenness of a glass plate by combining a single camera with a two-dimensional code. The method comprises the following steps: obtaining an image of the glass plate by using the single camera, and establishing a relation between image points and spatial three-dimensional points by accurately identifying a two-dimensional code (such as a QR code) array calculated by corner coordinates on the glass plate to determine three-dimensional information of an object. The whole measurement process comprises the steps of camera calibration and camera internal and external parameter calculation; solving camera external parameters based on glass plate reflection; for the two-dimensional code, firstly calculating a peripheral contour center distance as a positioning point, and then determining four vertex coordinates of the two-dimensional code according to a contour vertex relation; fitting the deformation angular point coordinates on the acquired image with known angular point coordinates to obtain a reflection corresponding relation, solving a depth expression of each point of the glass plate according to the corresponding relation, recovering the surface topography, and analyzing the unevenness of the surface topography. The object reconstruction with the reflection characteristic is realized by combining the single camera with the two-dimensional code, the size of the measurement system can be reduced, the measurement cost is reduced, and the operation is convenient.

Description

technical field [0001] The invention relates to the technical field of visual measurement, in particular to a method for measuring the unevenness of a glass plate with a single camera combined with a two-dimensional code. Background technique [0002] The three-dimensional shape of the surface of the object is the most basic geometric property of the surface of the object. The acquisition of the information of the surface shape of the object is of great significance in industrial production and manufacturing. One of the problems that needs to be solved. In recent years, with the development of sensing technology, image processing and computer technology, the non-contact 3D reconstruction method, which has the advantages of fast and accurate measurement and a large measurable range, has been widely used in the field of object surface shape detection. Applications. [0003] Currently commonly used three-dimensional measurement methods include the use of binocular cameras or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80G06K7/14G01B11/30
CPCG06T7/80G06K7/1417G06K7/1443G06K7/1452G01B11/30
Inventor 卢荣胜程子怡张莲涛
Owner HEFEI UNIV OF TECH
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