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Digital grating projection measurement system calibration method for expanding calibration space

A digital grating and measurement system technology, applied in image data processing, instruments, calculations, etc., can solve problems such as measurement space calibration errors and limited calibration space, and achieve the effect of avoiding calibration errors

Active Publication Date: 2020-12-25
三代光学科技(天津)有限公司
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Problems solved by technology

[0005] In view of this, the present invention provides a digital grating projection measurement system calibration method that expands the calibration space to solve the problem of limited calibration space in the prior art and calibration errors in the measurement space beyond the range of the calibration plate

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  • Digital grating projection measurement system calibration method for expanding calibration space
  • Digital grating projection measurement system calibration method for expanding calibration space
  • Digital grating projection measurement system calibration method for expanding calibration space

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Embodiment Construction

[0039] In order to better understand the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0040] The present invention provides a digital grating projection measurement system calibration method that expands the calibration space, including:

[0041] S10: Expand the calibration space by obtaining the coordinates in the world coordinate system and the affine matrix between the coordinates in the image coordinate system;

[0042] S20: Obtain a relationship model between world coordinates, camera pixel coordinates and phases.

[0043] In the prior art, a calibration board is usually used to calibrate the system. The area of ​​the calibration area is limited to the area covered by the calibration points on the calibration board. The reason why the area other than the calibration points cannot be used for calibration makes the measurement space outside the calibration points inevitable. C...

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Abstract

The invention provides a digital grating projection measurement system calibration method for expanding a calibration space. The method comprises the following steps: S10, expanding the calibration space; and S20, obtaining a relation model between world coordinates and camera pixel coordinates and phases. According to the invention, the calibration space is expanded, the measurement space outsidethe calibration point is brought into the calibration range, and the relation model between the world coordinate and the camera pixel coordinate and phase is established in the space outside the calibration point, so that the calibration error is avoided.

Description

technical field [0001] The invention relates to a calibration method for a digital grating projection system, in particular to a calibration method for a digital grating projection measurement system that expands the calibration space. Background technique [0002] As a popular field and important direction of optical three-dimensional measurement technology, grating projection three-dimensional measurement technology has a series of advantages such as non-contact measurement, fast measurement speed and high measurement accuracy. With the development of science and technology and the progress of industrial production in recent years, grating projection measurement technology has been more and more widely used in the fields of industrial automation detection, biomedical diagnosis, cultural relics reproduction, virtual reality realization, product quality control and so on. System calibration is the basic link of grating projection technology, and the accuracy and precision of...

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Application Information

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IPC IPC(8): G06T7/70G06T7/80
CPCG06T7/70G06T7/80
Inventor 张效栋刘皓玥闫宁李泽骁
Owner 三代光学科技(天津)有限公司
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