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Table type large visual field three-dimensional scanning device and method

A technology of three-dimensional scanning and scanning method, which is applied in the field of three-dimensional measurement of structured light with large depth of field and large field of view, can solve the problems of measurement failure, measurement depth of field limitation, and insufficient depth of field, etc., and achieve reduced difficulty in use, good effect, reduced volume and effect of weight

Active Publication Date: 2017-05-10
XIAN CHISHINE OPTOELECTRONICS TECH CO LTD
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Problems solved by technology

However, this method needs to encode light through the DLP projection device, and its measurement depth of field is limited by the projection depth of field; at the same time, the measurement field of view is affected by the angle of the triangular relationship of binocular vision
In actual use, the size and shape of objects vary, and insufficient depth of field leads to problems such as measurement failure

Method used

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  • Table type large visual field three-dimensional scanning device and method
  • Table type large visual field three-dimensional scanning device and method
  • Table type large visual field three-dimensional scanning device and method

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Embodiment Construction

[0019] The calculation of the measurement range of the scanner is mainly determined by the projection device, and multiple sets of cameras are used to match the measurement range. The configuration parameters of the scanner system are calculated as follows:

[0020] The first step is to determine the depth of field calculation of the laser MEMSA galvanometer projection system:

[0021] Such as figure 1 , the Gaussian laser beam emitted by the laser 11 passes through the collimating lens 12, and is incident on the MEMS scanning galvanometer 13, and then reflected to the surface of the object. The focal plane of the Gaussian beam is at L 0 , the depth of field is ΔL. According to the calculation of the ABCD matrix, the spot size of the beam after passing through the lens can be obtained, and the maximum working distance L 2 spot size ω 2 , the minimum working distance L 1 The spot size is ω 1 , through the constraints of the following formula 1-1, finally determine L 1 an...

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Abstract

The invention discloses a table type large visual field three-dimensional scanning device and a method; the table type large visual field three-dimensional scanning device consists of multiple groups of cameras, a laser MEMS galvanometer projector, and a precise rotating table; the projector is arranged in the middle of multiple groups of cameras for projecting the structure light; multiple groups of cameras are symmetrically distributed at both sides of the projector, wherein two symmetrical cameras are one group. The device can cover the three-dimensional scan from small volume article to large volume article; the article is smaller, the measurement precision is higher; the method can realize one-button scanning, and acquire good complete model at 360 degrees.

Description

technical field [0001] The invention belongs to the field of optical detection, and relates to an optical detection method of a three-dimensional profile, in particular to a structured light three-dimensional measurement method with a large depth of field and a large field of view. Background technique [0002] 3D scanning has been widely used in reverse engineering, industrial inspection, and cultural relics protection. With the popularization of 3D printing, 3D scanning is more widely used in reverse design, education and training industries. Existing 3D scanners are mainly aimed at professional fields such as industrial inspection, and there are few scanners for ordinary consumers in industries such as reverse design and 3D printing education. [0003] At present, 3D scanning usually adopts methods such as laser line scanning, white light structured light, and stereo vision. The development of laser line scanning is the most mature, and the measurement depth of field is ...

Claims

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/2522G01B11/254
Inventor 李欢欢刘涛车玉彩郭迪姚东明向业
Owner XIAN CHISHINE OPTOELECTRONICS TECH CO LTD
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