Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Calibration plate of double-camera system for DIC (Digital Image Correlation) measurement and calibration method thereof

A calibration board and dual-camera technology, applied in the field of digital images, can solve the problems of low calibration accuracy, affect the accuracy of measurement results, and small imaging size, and achieve the effects of high calibration accuracy, simple design, and improved accuracy.

Inactive Publication Date: 2013-09-04
HARBIN INST OF TECH
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the object to be measured is much larger than the calibration plate (sometimes the calibration plate cannot be made to match the size of the object to be measured, for example, when the object to be measured is a tall building or a bridge), the two cameras are usually separated by a long distance (because All the huge objects to be measured should be taken into the lens), if two cameras are used to calibrate the calibration plate at the same time, the imaging size of the calibration plate in the camera screen will be very small, and the calibration accuracy will be very low, affecting Final measurement accuracy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Calibration plate of double-camera system for DIC (Digital Image Correlation) measurement and calibration method thereof
  • Calibration plate of double-camera system for DIC (Digital Image Correlation) measurement and calibration method thereof
  • Calibration plate of double-camera system for DIC (Digital Image Correlation) measurement and calibration method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0022] Embodiment 1: The shape design of the target group installation is based on the principle that its center coordinates can be easily calculated. In this embodiment, the design of a regular hexagon is taken as an example.

[0023] Such as Figure 1-3 As shown, the calibration plate of the dual-camera system used for DIC measurement in this embodiment is composed of a calibration plate substrate 1 and a target group, the front of the calibration plate substrate 1 is provided with speckle 2 that can be recognized by the DIC measurement system, and the target group is installed On the front of the calibration board substrate 1, the target group is composed of 6 double total station targets 3, and the centers of the 6 double total station targets 3 form a regular hexagon.

[0024] If the measured object is small, the calibration board includes two groups of target groups, and the two groups of target groups are respectively arranged at two ends of the diagonal line of the ca...

specific Embodiment approach 2

[0030] Embodiment 2: In this embodiment, the dual-camera system for DIC measurement is calibrated according to the following steps:

[0031] 1. First arrange two cameras, use the calibration board provided by the merchant to calibrate the two cameras separately, and obtain the independent parameters of the two cameras;

[0032] 2. According to the size of the measured object, make the calibration plate proposed by the present invention: if the measured object is small, you can make a rectangular calibration plate, and arrange 6 respectively near the diagonal of the calibration plate (lower left corner and upper right corner) Dual total station target. If the measured object is large, two calibration boards can be made, and each calibration board has a set of 6 dual total station targets, and these two calibration boards are placed at both ends of the measured object (the distance is farther away) ).

[0033] 3. Use dual total stations to measure two sets of targets with dual...

specific Embodiment approach 3

[0038] Specific implementation mode three: this implementation mode takes the measurement of the measured area of ​​20m as an example, and its calibration method is as follows:

[0039] 1. Adjust the distance and angle of the two cameras so that the two cameras can capture the measured object at the same time. Put the calibration board provided by the merchant in front of camera 1, make the calibration board fill the entire area of ​​the camera, shake the calibration board back and forth, left, right, up and down, and take 20 frames continuously at the same time to complete the parameter calibration of camera 1. Then put the calibration plate provided by the merchant in front of camera 2, and calibrate its parameters in the same way.

[0040] 2. Since the measured area is very large, the calibration plate of the present invention includes two small calibration plates ( Figure 4 ): Calibration board A and calibration board B. Make speckles on a flat board (there are many way...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a calibration plate of a double-camera system for DIC (Digital Image Correlation) measurement and a calibration method thereof and belongs to the technical field of digital images. The calibration plate comprises a calibration plate base plate and a target group, wherein the front face of the calibration plate base plate is provided with speckles; and the target group is arranged on the front face of the calibration plate base plate and consists of a plurality of targets; the centers of a plurality of double-total station targets form an equilateral polygon. Due to the adoption of the method of precisely measuring three-dimensional coordinates of the centers of the targets by double total stations and a geometric construction method, the size is precisely selected to calibrate space points, corresponding points on an image are precisely matched, and the size calibration precision is improved. A calibration plate which is provided by a seller is used for respectively calibrating the parameters of two cameras, the calibration plate provided by the invention is used for relating the two cameras, and the needed precision of calibrating the cameras when a large-size space object is measured is ensured. According to the invention, the calibration precision is higher, the manufacture is simple, and the carry is simple, which is of great importance for measuring the deformation of a large-size high precision object.

Description

technical field [0001] The invention belongs to the technical field of digital images, and relates to a calibration plate of a camera system and a calibration method thereof. Background technique [0002] At present, commercial products based on the principle of digital image correlation (DIC, Digital Image Correlation) have been widely used in three-dimensional deformation measurement in various fields. [0003] When performing 2D deformation measurement, only one camera can be used, and there is no need to calibrate the camera system. When performing 3D measurement, two cameras are usually required for simultaneous measurement to obtain the 3D deformation of the measured object. At this time, it is necessary to calibrate the camera system, determine the parameters of the two cameras and establish their spatial position relationship. [0004] Commercial products based on DIC (such as the VIC-3D full-field speckle measurement system at the CSI site in the United States) usu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 林国昌岳鹏阳谭惠丰王长国卫剑征
Owner HARBIN INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com