Calibration compensation method for height mapping based on path
A technology of height and path, which is applied in the field of 3D inspection, can solve the problems of repeated test accuracy reduction of inspection equipment, achieve the effect of suppressing distortion, suppressing sinusoidal distortion, and ensuring consistency
Pending Publication Date: 2022-05-13
嘉兴市像景智能装备有限公司
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[0003] The technical problem to be solved by the present invention is to overcome the problem in the prior art that the accuracy of repeated testing of testing equipment decreases due to systematic errors, and to provide a calibration compensation method that can effectively improve the high consistency of 3D testing equipment
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[0012] The specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings, so as to describe the technical solution of the present invention in detail.
[0013] Such as figure 1 with figure 2 As shown, the mechanism of the detection device adopted in the present invention includes a motion control platform, a camera, a projection unit and a calibration block. The motion control platform is controlled by servo motors in the X and Y directions and a stepping motor in the Z-axis direction. The vision system is composed of multiple projection units and cameras. The projection unit can be a digital projector or a group of The grating projection device composed of straight mirror group, sinusoidal grating and projection lens is mainly used to project sinusoidal light stripes to the surface of the detection object, and then observe each observation point through the camera, and process the observation data, and...
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A 3D measurement system projected by a sine fringe phase shift method has system errors such as non-uniform illumination, light source aging, lens distortion and assembly, and detection errors caused by overexposure and over-darkness due to the influence of the surface material of a detected object can be conducted and accumulated on a reduction path by adopting a path-based phase unwrapping and height mapping method, so that the detection errors can be reduced. And therefore, the consistency of the same object at different positions of the FOV is poor. The invention provides a calibration compensation method based on path phase unwrapping and height mapping. Firstly, a plurality of grid areas are established in an FOV for projection photographing and phase unwrapping, a calibration compensation line is established according to the phase change direction after unwrapping, then a fitting model is established with the distance from a sampling point to an axis as input and the ratio of the standard height to the actual height as output, segmented linear / nonlinear fitting is adopted for fitting, and the calibration compensation line is established. And performing iteration to obtain an optimal calibration parameter. According to the method, accumulative errors are effectively inhibited, and the consistency of height detection results of different positions of the FOV is remarkably improved.
Description
technical field [0001] The invention relates to the technical field of 3D detection, in particular to a calibration compensation method based on path-based height mapping in the sinusoidal fringe phase shift method projection 3D measurement technology. Background technique [0002] Industrial online 3D inspection, there are system errors such as uneven illumination, light source aging, lens distortion, and assembly, and detection errors caused by overexposure or overdarkness caused by the influence of the surface material of the object to be inspected, such as using path-based phase unwrapping in applications And the height mapping method will conduct and accumulate on the restoration path, resulting in errors in the height detection results, which will lead to poor consistency of the same object at different positions of the FOV. The invention patent aims to solve the problem of inconsistency of detection results at different positions of FOV. Contents of the invention ...
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IPC IPC(8): G01B11/00G01B11/06
CPCG01B11/002G01B11/0608
Inventor 王飞杨阳佘敏敏王志超翟雷
Owner 嘉兴市像景智能装备有限公司