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Stereo coding target for calibrating internal parameter and distortion coefficient of camera and calibration method thereof

A technology of distortion coefficient and internal parameter, applied in the field of stereo coding target and its calibration, can solve the problem of inaccurate error in feature corner extraction, and achieve the effects of stable detection results, simple calibration process, and reducing the influence of errors.

Inactive Publication Date: 2017-04-26
HEFEI UNIV OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to provide a stereo coding target and its calibration method for calibrating the internal parameters and distortion coefficients of the camera, so as to solve the problem of the error influence caused by the inaccurate extraction of feature corners on the image due to inaccurate focusing in the prior art

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  • Stereo coding target for calibrating internal parameter and distortion coefficient of camera and calibration method thereof
  • Stereo coding target for calibrating internal parameter and distortion coefficient of camera and calibration method thereof
  • Stereo coding target for calibrating internal parameter and distortion coefficient of camera and calibration method thereof

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[0035] refer to figure 1 , plate 1, plate 2, plate 3 and plate 4 are bonded into a whole, the dotted line part 8 represents the junction of the four non-coplanar plate parts of the three-dimensional coding target, and the circular characteristic pattern 5 on the three-dimensional coding target is for the experimental needs As the detection object, the present invention selects a 3×4 circular characteristic pattern array, the radius of the circular characteristic pattern 5 is 12 mm, and the distance between the centers of the circles is 29 mm.

[0036] The white quadrilateral encoding patterns 6, 7 are used to encode four non-coplanar plates.

[0037] Depend on figure 2 It can be seen that the plate 1, plate 2, plate 3 and plate 4 of the three-dimensional coding target are not coplanar with each other.

[0038] refer to image 3 , the present invention uses an industrial camera 9 placed on an optical platform to shoot a three-dimensional coded target 10. The focal length of...

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Abstract

The invention discloses a stereo coding target for calibrating an internal parameter and a distortion coefficient of a camera and a calibration method thereof. The stereo coding target is formed by four flat plates at a certain angle, the flat plates are provided with same circular characteristic pattern arrays, and the center of mass thereof is a to-be-extracted mark pint; and connecting positions of the flat plates in the vertical direction are provided with two quadrangular coding patterns used for coding of the four flat plates. The calibration method includes: firstly photographing a stereo coding target image; and extracting circular characteristic patterns in the image and the coordinate of the center of mass of the quadrangular coding patterns, wherein the quadrangular coding patterns are used for coding of the four flat plates, and the image coordinate and the physical coordinate of the center of mass of the circular characteristic patterns are used for calculating the internal parameter and the distortion coefficient of the camera. Compared with the prior art, according to the stereo coding target and the calibration method thereof, only one stereo coding target image needs to be photographed, the requirement of the depth of field of a camera lens is not high, the stereo coding target and the calibration method thereof are applicable to calibration of a multi-camera system, the mark points in different flat plates can be rapidly distinguished, the calibration process is simple, and the precision is high.

Description

technical field [0001] The invention relates to the technical field of camera calibration, in particular to a stereo coding target for calibrating camera internal parameters and distortion coefficients and a calibration method thereof. Background technique [0002] Photogrammetry technology is widely used in modern life and industrial measurement. Camera calibration technology is a key step in photogrammetry technology. The quality of calibration is directly related to the reliability of measurement results. According to the characteristics of the measurement object, the selected camera performance, number and arrangement of the camera array. At present, surface reconstruction of large-scale objects and three-dimensional modeling of three-dimensional objects have become the main hot issues. Improving the accuracy of calibration results and simplifying the calibration process have become the key technologies for multi-camera calibration. Existing calibration targets can be m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
CPCG06T2207/30244
Inventor 邓华夏余寰张进于连栋
Owner HEFEI UNIV OF TECH
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