A three-dimensional measurement method and system based on grating projection and binocular polarization camera
A technology of grating projection and three-dimensional measurement, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems that the sensor cannot effectively extract phase information, increase system operating costs, and reduce the accuracy of three-dimensional modeling, so as to enhance the working dynamic range , reduce operating costs, and quickly calibrate the effect
Active Publication Date: 2021-12-07
深度计算(长沙)信息技术有限公司
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Problems solved by technology
[0003] The traditional grating projection 3D measurement method works well for objects with rough surfaces, but has certain limitations for smooth objects
This is mainly because the fringe image acquired by the sensor is saturated due to specular reflection, and the sensor cannot effectively extract accurate phase information, thereby reducing the accuracy of 3D modeling
In addition, the grating projection three-dimensional measurement method based on a single sensor has extremely high requirements for system calibration. When the sensor or other system units need to be replaced, high-precision calibration needs to be performed again, which is costly and increases the operating cost of the system.
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[0060] In addition, the present invention also provides a three-dimensional measurement method based on grating projection and binocular polarization camera, comprising the following steps:
[0061] Step 100, adjusting the polarizer to obtain an object image with a high dynamic range, including the following steps: When the sensor is in the direction of specular reflection, and the specular reflection causes the fringe image acquired by the sensor to be saturated, adjust the light transmission axis of the polarizer to achieve strong selective shading The longitudinal wave or transverse wave of the camera reduces the light intensity of the entrance pupil of the camera so that it is within the ideal imaging light intensity of the camera and solves the problem of image saturation. In the process of adjusting the transmission axis of the polarizer, the light intensity of the entrance pupil of the camera will change from strong to weak, and then from weak to strong. Choose the one t...
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The embodiment of the present invention discloses a three-dimensional measurement method for a smooth object based on grating projection and a binocular polarization camera, including the following steps: step 100, adjusting the polarizer, and obtaining a high dynamic range object image; step 200, calibrating the binocular camera, Obtain the internal parameters and external parameters of the camera; step 300, set the grating projection, and project the stripes on the surface of the smooth object; step 400, extract and match the stripes, obtain the same name point; step 500, reconstruct the 3D model, and obtain the 3D model of the smooth object The present invention obtains the coordinate information of the smooth object surface based on the intersection of binocular stereo vision space, and realizes the accurate three-dimensional measurement of the smooth object surface. The present invention can effectively avoid the saturation situation caused by the specular reflection of the smooth object surface, and improve the applicable dynamic range of the system. At the same time, it can also reduce the difficulty of system calibration and reduce the operating cost of the system.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of non-contact measurement, and in particular to a three-dimensional measurement method and system based on grating projection and binocular polarization cameras. Background technique [0002] Optical three-dimensional measurement technology can quickly and accurately obtain three-dimensional information of objects under non-contact conditions, and has been widely used in intelligent quality inspection, three-dimensional reconstruction, contour size monitoring and other fields. The three-dimensional measurement of grating projection is the most important part of optical three-dimensional measurement technology. It projects the grating fringes on the surface of the measured object, and processes the image acquired by the sensor to extract the phase information of the fringes, and obtain the three-dimensional information of the object by solving. [0003] The traditional grating projectio...
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IPC IPC(8): G01B11/25
CPCG01B11/2504G01B11/2509
Inventor 杨彬崔凯阳朱岱
Owner 深度计算(长沙)信息技术有限公司