2 dimensional digital image related compensation method based on transformation of coordinates and 2 dimensional optical digital image related extensometer

A technology of image correlation and coordinate transformation, applied in image data processing, image analysis, calculation, etc., can solve the problem of small error angle and so on

Active Publication Date: 2017-02-22
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0014] The purpose of the present invention is: the present invention proposes a two-dimensional digital image correlation compensation method based on coordinate transformation, the method is mainly based on the coordinate transformation of the compensation plate, and the out-of-plane displacement and rotation of the compensation plate ca

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  • 2 dimensional digital image related compensation method based on transformation of coordinates and 2 dimensional optical digital image related extensometer
  • 2 dimensional digital image related compensation method based on transformation of coordinates and 2 dimensional optical digital image related extensometer
  • 2 dimensional digital image related compensation method based on transformation of coordinates and 2 dimensional optical digital image related extensometer

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[0082] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0083] Compared with the conventional two-dimensional digital image correlation method, the new method technically needs to introduce camera calibration (Zhang Z.A flexible new technique for camera calibration[J].Pattern Analysis and Machine Intelligence,IEEE Transactions on,2000,22(11) :1330-1334.), the hardware needs to use the calibration version[ figure 1 ] and the compensated version [ figure 2 ].

[0084] Using the compensation method to carry out this kind of two-dimensional digital image based on coordinate transformation is related to the experimental process is mainly divided into four steps:

[0085] (1) Before the experimental measurement, the camera and the plane specimen to be tested need to be fixed. The camera can be non-perpendicular to the plane to be measured (within 30 degrees), but it must be ensured that the scattered pl...

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Abstract

The invention discloses a 2 dimensional digital image related compensation method based on transformation of coordinates and a 2 dimensional optical digital image related extensometer, and relates to the field of non-contact type optical measuring. According to the invention, in order to address the in-plane deformation of a panel test specimen in 2 dimensional digital image related measuring, due to the error caused by out-of-plane displacement, the method and related compensation method and the related extensometer can be applied to accurate measuring of the in-plane deformation of the panel test specimen. According to the invention, the method is based on the transformation of coordinates of a compensation plate, and the acquisition of a single frame image can real-time acquire the out-of-plate displacement and rotation information of the compensation plate, thus removing the effects on the result of measuring by the out-of-plate displacement and rotation information. The method overcomes the problems of excessively large errors or smaller requirement angle of traditional measuring methods, and can be applied to real-time measuring of in-plane deformation of a 2 dimensional panel test specimen.

Description

technical field [0001] The invention belongs to or relates to the field of non-contact optical measurement. Specifically, the present invention proposes a two-dimensional digital image correlation compensation method based on coordinate transformation to solve the error problem caused by out-of-plane displacement when measuring the in-plane deformation of a flat specimen by two-dimensional digital image correlation. Two-dimensional optical digital Image-related extensometers. It can be used for accurate measurement of in-plane deformation of flat specimens. Background technique [0002] The digital image correlation method is a non-contact optical measurement method developed in the early 1980s. This method has been widely used in engineering survey. The traditional two-dimensional digital image correlation must ensure that the optical axis of the camera is perpendicular to the surface of the measurement specimen, and the out-of-plane displacement and rotation during the ...

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Application Information

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IPC IPC(8): G06T7/80
Inventor 张青川吕泽乾徐小海苏勇
Owner UNIV OF SCI & TECH OF CHINA
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