Calibration system and method for a large workpiece

A technology for large workpieces and calibration methods, applied in measuring devices, instruments, optical devices, etc., can solve problems such as object deformation, data errors, visual errors, etc., and achieve high accuracy, easy operation, and good effects.

Inactive Publication Date: 2018-02-09
UNIV OF JINAN
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Problems solved by technology

[0002] In various professional measurement fields, the trend of using images to detect the shape of objects is becoming more and more advanced. However, with the popularization of digital cameras or SLR cameras, the distortion of images captured by them is becoming more and more obvious. The resulting deformation of objects, visual errors, and data errors have brought more troubles to technicians

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  • Calibration system and method for a large workpiece
  • Calibration system and method for a large workpiece
  • Calibration system and method for a large workpiece

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Embodiment Construction

[0042] The present invention is described in detail below in conjunction with accompanying drawing:

[0043] Such as figure 1 , figure 2 As shown, a calibration system for large workpieces, a calibration system for large workpieces, including one-dimensional code 6, one-dimensional code 7, one-dimensional code 8, one-dimensional code 9; mark point 10, mark point 11, mark point 12. Marker point 13 and distance measuring device 15, high-definition camera 16 and computer 17.

[0044] The distance measuring device 15 includes a distance measuring instrument 4, the distance measuring instrument 4 is provided with a pull wire end 6, and the distance measuring instrument 4 is also connected with the start measurement button 2, the stop measurement button 3 and the distance value display Screen 1 is connected,

[0045] The distance measuring instrument 4 and the camera 16 are all connected to the computer 17 .

[0046]Among them, the one-dimensional code 6, the one-dimensional co...

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Abstract

The invention discloses a calibration system and method of a large-size workpiece. The method comprises the following steps: 1, designing one-dimensional codes and black circular feature points (mark points), and adhering the one-dimensional codes and the mark points to four corner positions at the surface of the large-size workpiece; 2, before images of the large-size workpiece are acquired, measuring the four feature points on the surface by use of a distance measurer; 3, performing shooting on the surface of the large-size workpiece described in the second step for image acquisition by use of a camera; 4, inputting the images of the large-size workpiece, acquired in the third step into a computer, and processing each image; successively identifying the four feature points actually measured in the second step, and determining a pixel coordinate value of each feature point in the images; 5, obtaining a relation function of conversion of a world coordinate system into a two-dimensional image coordinate system; and 6, according to a conversion function formula and each pixel point in a distortion image, solving real pixel values after the images are calibrated, and performing recombination on image pixels by use of all the values so as to finish the calibration process of a whole image.

Description

technical field [0001] The invention discloses a calibration method for a large workpiece, which belongs to the technical field of calibration of a large workpiece. Background technique [0002] In various professional measurement fields, the trend of using images to detect the shape of objects is becoming more and more advanced. However, with the popularization of digital cameras or SLR cameras, the distortion of images captured by them is becoming more and more obvious. The resulting deformation of objects, visual errors, and data errors have brought more troubles to technicians. Contents of the invention [0003] In order to solve the technical defects in the prior art, that is, to correct the inspection angle and data error of the image, the invention discloses a calibration system and method for a large workpiece. [0004] The technical scheme that the present invention adopts is as follows: [0005] A calibration system for a large workpiece, comprising a marking d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/00G01B11/00
CPCG01B11/00G01B21/00
Inventor 王玉增董晓晓王华峰曹若兰仲强
Owner UNIV OF JINAN
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