A 3D visual inspection system based on structured light imaging

Abstract

The invention relates to a 3D visual detection system based on structured light imaging. The system comprises a detection carrier, an information acquisition module and a control module, wherein a central processing unit of the control module is used for accurately controlling the detection table, the ultrasonic detector, the structured light camera and the irradiation lamp, calculating a detection grade K through pre-shooting, and adjusting the rotating speed of the detection table and a defect comparison threshold, therefore, the central processing unit controls the structured light camera to have enough time to acquire and process the shape information of the to-be-detected object, accuracy of acquiring the shape contour information of the to-be-detected object is improved, and the influence caused by the shape structure difference of the to-be-detected object is reduced. According to the system, the irradiation angle and position of the irradiation lamp are adjusted in real time inthe information acquisition process, therefore, the influence of part reflection on acquisition of the appearance information of the to-be-detected part is reduced, the position and angle of the structured light camera are adjusted in real time, the central processing unit acquires more complete information of the to-be-detected object, and detection precision of the system is indirectly improved.

Description

technical field [0001] The field of the present invention is the field of detection systems, specifically a 3D visual detection system based on structured light imaging. Background technique [0002] With the rapid development of computer technology and its wide application in the industrial field, many industrial technologies have undergone revolutionary progress. The technology of combining structured light structured light cameras with 3D vision algorithms to generate 3D models or coordinates has been widely used. And because of its high precision, structured light cameras are widely used in face recognition, real-time three-dimensional modeling and other fields. In many industrial fields, defect detection often uses manual recognition, and the scratches and defects of the object to be detected are identified by human eyes. Or use measuring tools to detect whether there is a deviation in the size of the object to be inspected. Some industrial fields use defect detection s...

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Problems solved by technology

[0003] 1. Manual identification is time-consuming and labor-intensive, and the results of manual identification are easily affected by human factors of the monitor, such as fatigue, personal knowledge level of the tester, etc., and the manual detection results are not accurate enough;

[0004] 2. The traditional detection system or device has poor detection accuracy, because the 3D visual inspection system has high requirements for the light illumination of the detection scene. If the light intensity is too high, it will cause parts to reflect light and cover up defects. If it is too small, it is not easy for parts with special structures. Therefore, the adjustment of light is extremely critical. The traditional detection system does not control the light irradiation situation and light irradiation position in real time according to the detection results;

[0005] 3. The traditional detection system or device does not adjust the detection parameters in the detection process according to the length, width and quality of the object to be detected, and does not consider the error caused by the shape and structure of the object to the detection result

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