Calibration method of 2d camera laser measuring head
A technology of laser measurement and calibration method, which is applied to measurement devices, optical devices, instruments, etc., can solve the problems that the calibration results are difficult to achieve high precision, and it is difficult to ensure the absolute coincidence of the laser plane and the calibration plate plane, and achieves simple operation. Effect
Active Publication Date: 2021-06-08
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
Since it is difficult to ensure the absolute coincidence of the laser plane and the calibration plate plane, the calibration results are difficult to achieve high accuracy
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[0032] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0033] A calibration method for a 2D camera-type laser measuring head, the 2D camera-type laser measuring head is used to obtain 2D contour detection data of an object to be measured, such as figure 1 As shown, the 2D camera-type laser measuring head includes a packaging shell 1, a line laser 2 fixed and packaged inside the shell 1, and a CCD camera 3; the laser plane 4 is perpendicular to the axis 6 of the packaging shell for contour ...
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The invention discloses a calibration method of a 2D camera-type laser measuring head. The measuring head includes a packaging shell, a line laser and a CCD camera. A laser line used to characterize the contour, the calibration plate intersects the laser plane emitted by the line laser; the CCD camera is used to capture the image of the calibration plate; this calibration method extracts the laser light strip projected from the line laser to the calibration plate through the differential method, and extracts Centerline, restore the centerline to the camera coordinate system, fit multiple centerlines in space, calculate the spatial equation of the laser plane in the camera coordinate system, and then calculate the spatial position relationship between the laser plane and the camera coordinate system; the present invention can be used It is used to accurately calibrate the internal parameters of the laser measuring head and the position of the laser plane; the calibration process does not require other auxiliary equipment, and the operation is simple.
Description
technical field [0001] The invention relates to the field of profile measurement, specifically a calibration method for a 2D camera-type laser measuring head. Background technique [0002] The appearance profile of an object contains a variety of external basic information, such as: integrity, aesthetics, etc. Measuring the contour information of an object is a common method to obtain the contour size. There are many methods of contour measurement, such as: three-coordinate measuring instrument, machine vision measurement, etc. In machine vision contour measurement, light section method is a commonly used contour measurement method. The light section method projects laser lines onto the surface of the object to be detected, captures the contour information with light strips, and obtains the appearance contour through image processing. The optical section method is used to measure the profile, and the spatial position of the laser plane is calibrated by using the calibrati...
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IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 王培俊罗磊康凯宁黄琳秦李坪徐浩陈亚东
Owner SOUTHWEST JIAOTONG UNIV