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Multi-camera calibration method based on cylindrical calibration object

A calibration method and cylinder technology, applied in image data processing, instruments, calculations, etc., can solve the problems affecting the calibration accuracy of camera external parameters, calculation accumulation error, cumbersome calibration process, etc., to achieve multi-camera global calibration, high calibration Accuracy, the effect of improving the calibration accuracy

Active Publication Date: 2018-11-06
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

The existing multi-camera calibration method converts the camera extrinsic parameters of each camera relative to different world coordinate systems into camera parameters relative to the same world coordinate system, which will cause the camera extrinsic parameter calibration process of the multi-camera system to be cumbersome and the calibration efficiency is low. , The cumulative error of the calculation directly affects the calibration accuracy of the camera's extrinsic parameters
At present, there is no method for multi-camera calibration with high efficiency, simple calculation process and high calibration accuracy.

Method used

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  • Multi-camera calibration method based on cylindrical calibration object
  • Multi-camera calibration method based on cylindrical calibration object
  • Multi-camera calibration method based on cylindrical calibration object

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Embodiment Construction

[0028] The present invention is realized in this way, a multi-camera calibration method based on a cylinder calibration object, which is characterized in that: checkerboard plus coding pattern, cylinder calibration and multi-camera calibration.

[0029] 1. Design of cylindrical calibration object

[0030] The present invention adopts a standard cylindrical object as a calibration object, and a sheet with a checkerboard pattern and the bottom layer are pasted on its surface to form a group of coded patterns, such as figure 1 shown. Specifically, the top is a checkerboard pattern, and the bottom layer is a group of coding patterns. The encoding pattern has a total of 22 bits, such as figure 2 As shown, choosing 5 numbers in a circular arrangement can uniquely determine its position, that is to say, the camera can uniquely determine its position as long as it sees 5 consecutive corner points. For example, it is agreed that the coding starts from 0, so the position of 11111 is...

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Abstract

The invention discloses a multi-camera calibration method based on a cylindrical calibration object. The method is mainly composed of chessboard grids and coded patterns, cylinder calibration and a multi-camera calibration. The method has the advantages that (1) using a standard cylindrical object as a calibration object, achieving single-camera calibration and easy operation, saving operation time and achieving high calibration precision; (2) using an annular coded marker to complete acquisition while acquiring a camera calibration image so as to provide convenience for multi-camera calibration while determining the positions and the sequence of the cameras; (3) accurately achieving multi-camera global calibration and saving operation steps and time by using the result of single-camera calibration and the uniquely determined camera positions and sequence.

Description

technical field [0001] The present invention designs a multi-camera calibration method based on a cylinder calibration object, and specifically relates to a checkerboard plus coding pattern, cylinder calibration and multi-camera calibration. Background technique [0002] With the development of science and technology, the measurement and detection of large surface size has gradually become the key issue and development trend of industrial product manufacturing, and has become a new research hotspot in the field of three-dimensional measurement. Traditional measurement methods are difficult to meet the requirements of large object measurement, so it is necessary to measure objects in multiple directions. In this process, the most critical step is to achieve multi-camera calibration. The existing multi-camera calibration method converts the camera extrinsic parameters of each camera relative to different world coordinate systems into camera parameters relative to the same wor...

Claims

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Application Information

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IPC IPC(8): G06T7/80
CPCG06T7/80G06T7/85G06T2207/30244
Inventor 伏燕军金露钟可君徐天义韩旭
Owner NANCHANG HANGKONG UNIVERSITY
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