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Three-dimensional shape dynamic measurement method based on active spot projector

A three-dimensional shape and dynamic measurement technology, which is applied in the field of three-dimensional data measurement of moving objects, can solve problems such as slow scanning speed, achieve strong anti-interference, fast measurement speed, and realize the effect of multiple dynamic measurements

Active Publication Date: 2016-09-07
渭南领智三维科技有限公司
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Problems solved by technology

[0002] At present, there are many non-contact optical measurement methods based on cameras. Various commercial scanning systems have appeared at home and abroad. These systems are generally based on grating, infrared or laser scanning principles. Since one scan requires multiple projections of gratings or laser stripes, making The overall scanning speed is slow, so it is mainly used for scanning objects in a static state
However, these methods are no longer applicable when the object needs to obtain its shape during motion.

Method used

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  • Three-dimensional shape dynamic measurement method based on active spot projector
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  • Three-dimensional shape dynamic measurement method based on active spot projector

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and specific embodiment the present invention is further described:

[0026] In one embodiment, the present invention discloses a three-dimensional rapid scanning method based on an active spot projector;

[0027] The method comprises the steps of:

[0028] S100, making an active spot projector;

[0029] S200. Multi-measurement head global calibration: calibrate the internal and external orientation elements of the camera in each measurement head by arranging a calibration plate in the measurement field of view, and then determine the coordinate system transformation matrix between the measurement heads;

[0030] S300, using the multi-measurement heads to collect the speckle pattern projected on the surface of the moving object by the active speckle projector produced in step S100, and each measurement head obtains two speckle images respectively;

[0031] S400. Use the digital image correlation method to perform image ma...

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Abstract

The invention discloses a three-dimensional shape dynamic measurement method based on an active spot projector. The method comprises the steps of S100, fabricating an active spot projector, S200, carrying out global calibration on multiple measuring heads, S300, acquiring speckle images projected by a speckle projector to the surface of a moving object by using the multiple measuring heads, S400, carrying out three-dimensional reconstruction for the surface of the moving object, and S500, carrying out point cloud global alignment. The method disclosed by the invention is high in measurement speed, can complete acquisition of image data within two milliseconds, realizes a single time of measurement for general moving objects, and can also realize multiple times of dynamic measurement for a rotating object at the measuring heads. The method does not need to carry out spraying treatment on the object surface and is high in anti-interference for the ambient light, and measurement is not affected by the external light intensity.

Description

technical field [0001] The invention relates to the field of three-dimensional data measurement of a moving object in the field of image processing and three-dimensional optical measurement, in particular to a three-dimensional fast scanning method of a large moving object. Background technique [0002] At present, there are many non-contact optical measurement methods based on cameras. Various commercial scanning systems have appeared at home and abroad. These systems are generally based on grating, infrared or laser scanning principles. Since one scan requires multiple projections of gratings or laser stripes, making The overall scanning speed is relatively slow, so it is mainly used for scanning objects in a static state. However, these methods are no longer applicable when the shape of the object needs to be obtained during the motion. [0003] In high-tech and cutting-edge industries, the demand for contour measurement of moving objects is very urgent. How to quickly ...

Claims

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/25G01B11/2504
Inventor 梁晋千勃兴冯超张铭凯孟繁昌赵鹏亮
Owner 渭南领智三维科技有限公司
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