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Structured light projection-based high-speed three-dimensional measurement system

A structured light projection and three-dimensional measurement technology, applied in the field of three-dimensional sensing, can solve the problems of measurement accuracy dependence, measurement field limitation, measurement speed influence, etc.

Inactive Publication Date: 2011-01-26
傅仕伟 +1
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Problems solved by technology

[0002] Real-time 3D scanning is the development direction of 3D sensing technology. At present, there are two main methods to realize real-time 3D scanning. One is the use of Fourier transform 3D measurement profilometry. This method only needs one frame of image to obtain the object The three-dimensional profile information, so the measurement speed is very fast, but because its measurement accuracy is extremely dependent on the quality of the stripes, when the shape of the object is complex, its measurement accuracy drops sharply, so its measurement field is very limited
The other is the use of phase-shift three-dimensional measurement profilometry. The advantage of this method is that it has high measurement accuracy and can be used to measure the surface of complex objects. However, since more than three fringe images with accurate phase shift need to be projected, its measurement speed greatly affected
Restricted by the projection system, the fastest measurement speed using this method can only reach 667 frames per second, which is far from meeting the requirements of high-speed 3D measurement

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Embodiment Construction

[0011] 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.

[0012] In the embodiment of the present invention, an array of LED point light sources of different colors is used as the light source of the grating stripe projection system, and the light source array can complete strobe within the order of us, and a pair of inverted prisms or a For reflective gratings placed in parallel, since the triangular prism or reflective grating has a dispersion effect on light of different colors, when light sources of different colors are used for projection illumination, the projection image of the grating will translate along the direction of dispersion, thus obtaining...

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Abstract

The invention is applied in the technical field of three-dimensional sensing, and provides a structured light projection-based high-speed three-dimensional measurement system, which comprises a set of phase shifting image projection unit and a high-speed camera, wherein the phase shifting image projection unit comprises a multi-color LED point light source array; and along the emergent direction of the multi-color LED point light source array, the phase shifting image projection unit further comprises a collimating lens, a grating, a pair of reflection gratins arranged in parallel or a pair of inversely-arranged triple prisms, and a projection lens which are sequentially arranged. The structured light projection-based three-dimensional measurement system further comprises a drive circuit for driving the multi-color LED point light source array. The high-speed camera is used for shooting a projection image of the grating on the surface of a measured object, and has shutter frequency synchronous with the frequency of stroboflash of the multi-color LED point light source array. The structured light projection-based high-speed three-dimensional measurement system realizes the high-speed phase shift of the grating image by utilizing the quick frequency response characteristics of LEDs and the dispersion effect of the triple prisms or the reflection gratings, and then performs synchronous shooting by using the high-speed camera to realize high-speed three-dimensional measurement.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional sensing, in particular to a high-speed three-dimensional measurement system for structured light projection. Background technique [0002] Real-time 3D scanning is the development direction of 3D sensing technology. At present, there are two main methods to realize real-time 3D scanning. One is the use of Fourier transform 3D measurement profilometry. This method only needs one frame of image to obtain the object Therefore, the measurement speed is very fast, but because its measurement accuracy is extremely dependent on the quality of the stripes, when the shape of the object is complex, its measurement accuracy drops sharply, so its measurement field is very limited. The other is the use of phase-shift three-dimensional measurement profilometry. The advantage of this method is that it has high measurement accuracy and can be used to measure the surface of complex objects. However, sinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24H04N5/232
Inventor 吴庆阳惠彬李景镇
Owner 傅仕伟
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