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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 can be obtained in real time by collecting a single frame image information, thereby eliminating its influence on the measurement results, overcoming the problems of excessive errors or small rotation angles of traditional measurement methods, and can be used for real-time measurement of in-plane deformation of two-dimensional flat specimens

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