Calibration method of coded structured light three-dimensional vision system

A technology for coding structured light and calibration method, which is applied in the calibration field of structured light three-dimensional vision system, and can solve the problems of inability to meet practical application needs and low calibration accuracy of projectors.

Inactive Publication Date: 2010-03-17
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing calibration method of coded structured light 3D vision system, the projector calibration accuracy is low and cannot meet the needs of practic

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  • Calibration method of coded structured light three-dimensional vision system
  • Calibration method of coded structured light three-dimensional vision system
  • Calibration method of coded structured light three-dimensional vision system

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[0042] The present invention will be further described below in conjunction with the drawings.

[0043] Reference Figure 1~Figure 9 , A calibration method for a coded structured light vision imaging system, the calibration method comprising the following steps:

[0044] 1). Camera calibration process:

[0045] Using a two-dimensional calibration template, the target is a standard black and white chess grid, and the characteristic points are chess grid points. The camera shoots multiple images at different positions. The grid corner points are selected as the feature points for the multiple images, and the plane is used. The calibration method calibrates the camera, obtains the camera internal parameter calibration K, and obtains the average focal length

[0046] 2) The calibration process of the projector:

[0047] The light template generated by encoding is projected onto a common target, the corners of the black and white squares are used as anchor points, and the images obtained ...

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Abstract

A calibration method of a coded structured light three-dimensional vision system comprises the following steps of: 1) camera calibration processes: i.e. a two-dimensional calibration template is adopted, a calibration target consists of standard black and white chess checks, feature points are formed by chess checks points, a camera shoots a plurality of images in different positions, check angular points are selected as the feature points for the plurality of images, and a plane calibration method is adopted for calibrating the camera so as to obtain internal parameter calibration K of the camera as well as a mean value focal distance f; and 2) projector calibration processes: i.e. a light template generated from coding is used for projection onto a coplane calibration target, black and white check angular points are used as positioning points, and image coordinates of the black and white check angular points are simultaneously extracted to generate a world coordinate by utilizing theimages obtained from the camera calibration. The calibration method achieves high camera calibration accuracy and can satisfy the requirements of actual application.

Description

technical field [0001] The invention relates to computer vision, data processing, and image processing, in particular to a calibration method for a structured light three-dimensional vision system. Background technique [0002] The structured light 3D system restores the 3D shape from the 2D images acquired by the camera. The structured light system has the excellent characteristics of high precision, and the calibration of the camera and projector plays a very important role. The relationship between the position of the camera, the projector and the object, and the relationship between the projector and the camera are determined by the imaging geometric model of the camera and the projector. The parameters of the two geometric models are called system parameters. These parameters must be determined by the experiment The process of experiment and calculation is called structured light system calibration. The calibration of the system is to obtain the relationship between ea...

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Application Information

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IPC IPC(8): G06T7/00
Inventor 陈胜勇胡正周刘盛李帅王万良
Owner ZHEJIANG UNIV OF TECH
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