Linear structured light system calibration method based on homography matrix

A homography matrix and line structured light technology, applied in the direction of optical devices, measuring devices, instruments, etc., can solve the problems of high algorithm complexity and difficult operation, and achieve low computational complexity, simplified experimental steps, and fast speed Effect

Active Publication Date: 2019-03-08
SICHUAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing line structured light system calibration method is diffic

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  • Linear structured light system calibration method based on homography matrix
  • Linear structured light system calibration method based on homography matrix
  • Linear structured light system calibration method based on homography matrix

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[0048] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments shown and described in the drawings are only exemplary, and are intended to illustrate the principle and spirit of the present invention, but not to limit the scope of the present invention.

[0049] The embodiment of the present invention provides a calibration method of a line structured light system based on a homography matrix, such as figure 1 As shown, it includes the following steps S1 to S10:

[0050] S1. Vertically fix the calibration target on the translation device.

[0051] In the embodiment of the present invention, a specially designed calibration target is adopted, and its plane includes two symmetrical checkerboard areas, and a white area for projecting line lasers is arranged between the two checkerboard areas. In the embodiment of the present invention, the size of each checkerboard is 10 mm...

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Abstract

The invention discloses a linear structured light system calibration method based on a homography matrix, a light knife plane is constructed, a calculation method of the homography matrix is adopted,and linear structured light system calibration is completed. By translation of a calibration target, light knife images and target images at different positions are obtained, and feature point imagesare extracted from the two images at the same position, so that a light knife feature plane is formed. According to a camera pinhole imaging model, a homography matrix relation between the light knifefeature plane and an image plane in a camera system can be established, and the matrix is worked out, so that the calibration is completed. The method has the advantages that the calibration processis simple, the calculation complexity is low, and the method is suitable for rapid acquiring of three-dimensional information of an object and industrial measurement.

Description

technical field [0001] The invention belongs to the technical field of machine vision measurement, and in particular relates to the design of a method for calibrating a line structured light system based on a homography matrix. Background technique [0002] Among many active vision measurement technologies, the three-dimensional sensing technology based on laser triangulation has the advantages of simple structure, low cost, non-contact, flexible operation, fast measurement speed, moderate precision, and easy extraction of light strip image information. It has broad application prospects in engineering, physical profiling and other fields. When this type of technology calculates the three-dimensional shape information of the object to be measured, the linear light source projects the linear structured light onto the surface of the measured object, and the camera obtains the graphic information containing the linear structured light from a certain angle, and the graphic infor...

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/002
Inventor 刘元坤平乙杉张启灿薛俊鹏
Owner SICHUAN UNIV
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