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Correlation reconstruction method of 3D digital image with biprism single camera using telecentric lens

An image correlation, three-dimensional digital technology, applied in image enhancement, image analysis, image data processing and other directions, can solve the problems of ignoring three-dimensional refraction effects, model errors, etc., to achieve the effect of convenient programming, reducing model errors, and small computational load

Active Publication Date: 2018-08-10
TSINGHUA UNIV
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Problems solved by technology

However, the above reconstruction methods have certain limitations. For example, the improved virtual point model proposed by Wu et al. assumes that the camera and the double prism are aligned, and ignores the three-dimensional refraction effect of light in the double prism, so there is a model error

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  • Correlation reconstruction method of 3D digital image with biprism single camera using telecentric lens
  • Correlation reconstruction method of 3D digital image with biprism single camera using telecentric lens
  • Correlation reconstruction method of 3D digital image with biprism single camera using telecentric lens

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[0026] The following will describe in detail the relative reconstruction method of the 3D digital image with a dual prism and a single camera using a near-center lens proposed by the present invention through the accompanying drawings and embodiments. This embodiment is a measurement of the axial deformation of a loaded tensile sample. The embodiments described below by means of figures are exemplary, and are only used for explaining the present invention, and should not be construed as limiting the present invention.

[0027] The embodiment of the inventive method is based on a typical BSL 3D DIC measurement system, such as figure 1 shown. The system includes: a calibration plate 1, a double prism 2, an image acquisition device and a pericentric lens combination called a camera. Wherein: the spatial position and posture of the calibration board 1 can be adjusted arbitrarily; the calibration board used in this embodiment is a checkerboard calibration board with a side length...

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Abstract

The invention relates to a BSL 3D DIC reconstruction method using a pericentric lens, and belongs to the fields of photomechanics and 3D DIC related technologies. The method comprises that an image before deformation of a sample, an image after deformation of the sample, an edge identification image and scaling board images are collected, and internal and external parameters of a camera are obtained via scaling; a reference world coordinate system in parallel with the back surface of a biprism is established, the transformation relation between the reference world coordinate system and a camera coordinate system is determined according to the external parameters; spatial positions of edges of the biprism lens and an original point mark are determined, and a space coordinate system is established; reconstruction operation and trial are carried out on the space coordinate of an angular point of a scaling board to determine the position of the space coordinate system; and according to paired pixel coordinates in the sample image, reconstruction operation is carried out on morphology before deformation of the sample and morphology after deformation of the sample to determine displacement generated by deformation of the tested sample. The method greatly reduces model error of the reconstruction method, and is low in operand, convenient to program and easy to realize automatic processing of large batch of data.

Description

technical field [0001] The invention belongs to the technical fields of photometric experiment mechanics and three-dimensional digital image correlation, and in particular relates to a double prism single camera three-dimensional digital image correlation (BSL 3D DIC) reconstruction method using a near-center lens. Background technique [0002] Three-dimensional digital image correlation (3D DIC) method is a full-field non-contact deformation measurement method commonly used in the field of photometric experimental mechanics, and is widely used in performance testing and structural characterization of aerospace materials. This method uses multiple cameras to observe the measured area at the same time, reconstructs the three-dimensional shape of the object through the principle of stereo vision, and obtains its three-dimensional displacement component at the same time, which has the advantages of wide application range and reliable test results. However, the traditional 3D DI...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/00G06T7/00
CPCG06T17/00G06T2207/10004
Inventor 谢惠民吴立夫朱建国
Owner TSINGHUA UNIV
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