Three-dimensional detection system for surface of large thin-shell object and detection method thereof

A technology for object surface, three-dimensional detection, applied in the field of three-dimensional sensing, can solve the problem of few detection devices, and achieve the effects of low cost, high data density, and large measurement range

Active Publication Date: 2011-03-30
SHENZHEN ESUN DISPLAY
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Problems solved by technology

Therefore, there are very few existing detection device

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  • Three-dimensional detection system for surface of large thin-shell object and detection method thereof
  • Three-dimensional detection system for surface of large thin-shell object and detection method thereof
  • Three-dimensional detection system for surface of large thin-shell object and detection method thereof

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[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0022] In the embodiment of the present invention, phase mapping technology, computer vision technology and computer graphics technology are combined, and three sets of sensors are used to realize surface size measurement and online detection of large-size, thin-shell, and box-like objects.

[0023] The detection process provided by the embodiment of the present invention can be divided into 4 stages, namely, detection site layout planning, sensor system calibration, multi-sensor control and measurement, multi-field measurement data matching, object size (length, width, height, wall thickness, ...

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Abstract

The invention is applied to the technical field of three-dimensional sensing, and provides a three-dimensional detection system for the surface of a large thin-shell object and a detection method thereof. The detection method comprises that: three groups of sensors project fringes to the surface of an object to be detected in the upper, middle and lower directions of the object to be detected, acquire a deformation fringe graph, acquires phase distribution information, and acquires three-dimensional depth data of each viewing field by combining phase and depth mapping principle; multi-sensor calibration information is matched with the depth data acquired by the three sensors, and multi-angle data is matched to the same coordinate system; and dimensions are acquired and models are compared, namely the measured three-dimensional data is matched with a computer-aided design (CAD) model, distances from all measuring point to the CAD model are calculated, error distribution pseudo-color pictures of the inner side face, outer side face, inner bottom surface and outer bottom surface of the object, and the related dimension of the object, such as the length, width, height, wall thickness and the like are calculated by methods such as ray tracing and the like.

Description

Technical field [0001] The invention belongs to the technical field of three-dimensional sensing, and particularly relates to a three-dimensional detection system and a detection method for the surface of a large thin-shell object. Background technique [0002] With the development of industry, the requirements for the automatic 3D detection of the surface of large 3D objects (especially with special shapes) are becoming more and more demanding. Not only is it necessary to measure the 3D depth data of the surface of the object quickly and accurately, but also in less time. Complete the comparison with the CAD model and automatically generate the inspection report. At present, three-dimensional measurement methods for large objects can be divided into photogrammetry, three-coordinate measuring machine, line laser and structured light methods. Among them, the photogrammetric method has high accuracy, but it is necessary to paste marking points on the surface of the object to be me...

Claims

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Application Information

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IPC IPC(8): G01B11/25G01B11/02
Inventor 刘晓利彭翔李阿蒙殷永凯
Owner SHENZHEN ESUN DISPLAY
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