Three-dimensional shape measurement system and method for large-size object

A technology of three-dimensional shape and measurement system, applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems of difficulty in ensuring measurement accuracy, inability to clearly capture marks, inconvenient implementation, etc.

Active Publication Date: 2015-10-21
HUAWEI TEHCHNOLOGIES CO LTD
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Problems solved by technology

However, when the distance between the tracker and the 3D scanner becomes large, the stereo tracker will not be able to clearly capture the mark, so the measurement accuracy is difficult to guarantee; the labeling method needs to place a reference label on the surface of the measured object, and realize it according to the label. Splicing, so in actual production, it is very inconvenient to implement

Method used

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  • Three-dimensional shape measurement system and method for large-size object
  • Three-dimensional shape measurement system and method for large-size object
  • Three-dimensional shape measurement system and method for large-size object

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Embodiment

[0067] The measurement method of the above-mentioned three-dimensional shape measurement system for large objects is applied through an embodiment below, which specifically includes the following steps:

[0068] (1) Place a calibration plate 12 between the first stereo vision system 7 and the second stereo vision system 8 of the three-dimensional scanner 6, such as figure 2 shown; then the two sets of stereo vision systems are calibrated by the server 1;

[0069] (2) Place the calibration plate 12 on one side along the sliding guide rail 2, and calibrate the laser rangefinder 5 through the server 1, as Figure 4 shown;

[0070] (3) The measurement object in the present embodiment is a large curved steel plate 11, such as Figure 5 shown. The projector 10 projects structured light to the curved steel plate 11; the four industrial cameras 9 in the first stereo vision system 7 and the second stereo vision system 8 acquire partial images of the curved steel plate 11, and trans...

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Abstract

The invention discloses a three-dimensional shape measurement system and method for a large-size object. According to the invention, two sets of stereoscopic vision systems in a three-dimensional scanner are calibrated and local data of single measurement of the large size object is acquired by using the three-dimensional scanner. By using the two sets of the stereoscopic vision systems, the single measurement range can be expanded. The three-dimensional scanner is moved for measuring different parts of the large-size object and local data obtained through multiple measurements is subjected to three-dimensional data integration by a server according to distance change measured by a laser ranger. By adopting the method and system provided by the invention, accurate measurement of the large-size object can be realized flexibly.

Description

technical field [0001] The invention relates to a three-dimensional measurement technology of a large object, in particular to a three-dimensional shape measurement system of a large object and a measurement method thereof. Background technique [0002] At present, three-dimensional measurement technology mainly includes contact measurement and non-contact measurement. In industrial production, some large workpieces can only use non-contact 3D measurement technology, such as ship curved steel plates. Non-contact 3D measurement technology includes two categories: visual camera 3D measurement and laser 3D measurement. The photographic three-dimensional measurement system has the advantages of fast measurement speed and high measurement density. The laser measurement system has the advantages of high measurement accuracy, but when measuring large targets, the laser scanning speed is slow, which cannot meet the real-time requirements in industrial production. [0003] Visual ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 史金龙白素琴钱强庞林斌王直刘镇张洪涛王敏
Owner HUAWEI TEHCHNOLOGIES CO LTD
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