A Universal Calibration Method for Telecentric Binocular Stereo Vision Measurement System

A binocular stereo vision and measurement system technology, applied in the field of computer vision, can solve problems such as unsuitable telecentric binocular stereo vision measurement system

Active Publication Date: 2019-11-01
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, the calibration of telecentric optical systems is not so straightforward, especially in the Z direction, because the telecentric system will make the transformation along the optical axis insensitive.
Therefore, the traditional calibration method based on the small hole camera model based on perspective projection is not suitable for the calibration of the telecentric binocular stereo vision measurement system

Method used

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  • A Universal Calibration Method for Telecentric Binocular Stereo Vision Measurement System
  • A Universal Calibration Method for Telecentric Binocular Stereo Vision Measurement System
  • A Universal Calibration Method for Telecentric Binocular Stereo Vision Measurement System

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Embodiment Construction

[0049] The measurement system requiring calibration in the present invention includes a telecentric camera A, a telecentric camera B and a data processing computer, and the calibration board used is a random dot calibration board. The data processing computer communicates with the two telecentric cameras, collects the image data of the two telecentric cameras synchronously in real time, and calculates the calibration results of the system. The random dot calibration plate is generated by the algorithm and then printed and pasted on a flat calibration plate.

[0050] Using the present invention to calibrate a stereo vision measurement system composed of two telecentric cameras, the specific steps are as follows:

[0051] The first step is to identify the random dot calibration plate

[0052] 1.1 Generate a random dot calibration plate through the relevant algorithm, obtain the coordinates of its center in the reference system, print the generated calibration plate with a suita...

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Abstract

The invention relates to a universality calibration method for a telecentric binocular stereo vision measurement system. Through a designed planar calibration board for randomly distributed dots, full-automatic identification of control points is realized. By applying the calibration board, the locating of the control points is more accurate, and is even robuster under the condition of local obstruction and a large tilt angle. The invention provides a structural model of a stereo telecentric camera system. Structural parameters are kept unchanged in a calibration process, so that the structural parameters are optimized by adopting bundle adjustment. Compared with an existing method, multiple groups of images shot at the same time are optimized by applying the bundle adjustment, so that camera parameters obtained by calibration are remarkably improved.

Description

technical field [0001] The invention belongs to the field of computer vision, in particular to a universal calibration method for a telecentric binocular stereo vision measurement system. Background technique [0002] With the development of precision manufacturing, there is also a push and demand for the development of precise three-dimensional measurement on a small scale. Establishing triangulation relationship through binocular stereo vision measurement system is a relatively mature three-dimensional measurement technology. Compared with interferometry methods such as holographic interferometry, moiré and electronic speckle interferometry (ESPI), this technology requires simpler optical path design and does not require anti-vibration. Therefore, this method is widely adopted in many fields. Traditionally, a typical binocular stereo vision measurement system consists of two general lenses. However, the distance between the optical systems must be very small for 3D meas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/80
CPCG06T7/85
Inventor 刘海波姚林伸尚洋
Owner NAT UNIV OF DEFENSE TECH
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