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Calibration method of grating three-dimensional measurement based on colorful circular ring calibration board

A technology of three-dimensional measurement and calibration method, applied in the field of measurement, can solve the problems of inaccurate calibration, poor calibration accuracy, difficult measurement and determination, etc., and achieve the effect of simple measurement method

Inactive Publication Date: 2017-05-31
佛山市安答科技有限公司 +1
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Problems solved by technology

[0006] 3. The color of the pattern on the calibration board, especially the dark color such as black, seriously affects the projection light and further affects the absolute phase, resulting in inaccurate calibration;
[0007] 4. The reference plane is an imaginary plane, which is difficult to determine in practice, and the calibration with phase difference needs to use the reference plane, resulting in poor calibration accuracy

Method used

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  • Calibration method of grating three-dimensional measurement based on colorful circular ring calibration board
  • Calibration method of grating three-dimensional measurement based on colorful circular ring calibration board

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Embodiment Construction

[0026] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0027] Such as figure 1 and figure 2 As shown, a calibration method of a grating three-dimensional measurement system based on a color ring calibration plate includes the following process steps:

[0028] (1) Use the traditional equidistant black and white checkerboard to calibrate the camera separately, and obtain the Ac and radial distortion parameters of the camera, where Ac is the internal parameter matrix;

[0029] (2) Design a color ring calibration board. The color rings are required to be equally spaced up and down and left and right respectively. The size of the color rings can be customized. The number of rings is greater than 2*3. The color should be light rather than dark;

[0030] (3) Place the calibration plate in the measurement ...

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Abstract

The invention discloses a calibration method of grating three-dimensional measurement based on a colorful circular ring calibration board, and relates to the technical field of measurement. The calibration method comprises steps of calibration of a camera; designing of a calibration board; shooting of images; calculation of a panel equation of the calibration board; acquisition of the pixel height; calculation of the pixel absolute phase position; and calculation of the abscissa and the ordinate of each pixel. According to the invention, the method is free of a precise displacement device and a reference panel; the height expression is simple without division operation; projection, a three-dimensional measurement system projector and the position angle of a camera do not need to be considered; the measurement method is simple and convenient; and three-dimensional calibration of any image point under the camera coordinate system is well achieved.

Description

technical field [0001] The invention relates to the technical field of measurement, in particular to a calibration method for a grating three-dimensional measurement system based on a color ring calibration plate. Background technique [0002] Project a group of sine / cosine grating images with displacement to the reference surface, and then obtain a group of images by cameras respectively. The group of images is calculated by the phase shift formula to obtain the wrapped phase of the reference surface. After solving the phase, you can get Absolute phase of the reference plane. System calibration is the process of establishing the corresponding relationship between the absolute phase and the three-dimensional size of the object, and it is also the prerequisite for accurate measurement. [0003] At present, the existing calibration methods mainly have the following problems: [0004] 1. The height expression contains division, which can easily cause super high points or infi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
CPCG01B11/2531
Inventor 雷宏伟
Owner 佛山市安答科技有限公司
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