Real-time Adjustment Method of Accuracy of Surface Scanning 3D Measurement System

A technology for 3D measurement and system accuracy, applied in measurement devices, image analysis, instruments, etc., can solve problems such as reducing the number of recalibrations, frequent repeat calibrations, and difficulty in detecting the accuracy of surface scanning 3D measurement systems.

Active Publication Date: 2016-08-31
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for real-time adjustment of the accuracy of the surface scanning 3D measurement system, which can effectively solve the problems of difficult detection of surface scanning 3D measurement system accuracy and frequent repeated calibration, and can automatically detect surface Whether the accuracy of the scanning 3D measurement system meets the measurement requirements, optimize relevant parameters in real time to maintain the appropriate accuracy of the surface scanning 3D measurement system and reduce the number of recalibration

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  • Real-time Adjustment Method of Accuracy of Surface Scanning 3D Measurement System

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[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0022] In the real-time adjustment method of the accuracy of the area scanning three-dimensional measurement system in the embodiment of the present invention, the area scanning three-dimensional measurement system includes a projector, a first camera and a second camera. Such as figure 1 As shown, the method specifically includes the following steps:

[0023] (1) For the first camera and the ...

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Abstract

The invention discloses a real-time adjustment method for the accuracy of a surface scanning three-dimensional measurement system. First, determine whether the accuracy of the surface scanning 3D measurement system meets the requirements by judging whether the internal and external parameters of the camera meet the requirements of the current working state. If the internal and external parameters of the camera meet the requirements of the current working state, continue to measure; The parameters are optimized so that the average value of the objective function is the smallest. At this time, the internal and external parameters of the camera are considered to be optimal; then it is judged whether the average value of the objective function is less than the error threshold, and if yes, continue to measure with the optimized internal and external parameters of the camera, otherwise Prompt the user to re-calibrate. The method can perform self-inspection of accuracy and automatic optimization of camera parameters in real time and online, and can keep the average value of the reprojection error of the camera at about 0.0028 pixels for more than 20 days without repeated calibration.

Description

technical field [0001] The invention belongs to the technical field of surface scanning three-dimensional measurement, and more particularly relates to a method for real-time adjustment of the precision of a surface scanning three-dimensional measurement system. Background technique [0002] Calibration accuracy of internal and external parameters of the camera is the key to the 3D measurement system. Due to the complexity of the working environment, the internal and external parameters of the camera are constantly changing due to the influence of the environment, and its accuracy seriously affects and restricts the accuracy of the 3D measurement results of surface scanning. At present, the surface scanning 3D measurement system is more and more widely used in the fields of industrial precision inspection, additive manufacturing, digitalization of cultural relics, medical treatment, 3D photography and other fields. During the use of the system, frequent parameter calibration...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G01B11/00
Inventor 李中伟夏泽民钟凯史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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