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Three-dimensional information detection method based on two-line laser

A technology of three-dimensional information and detection methods, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of small application range of single-line laser detection, low precision of single-line laser, and limited operation methods, etc., and achieve light weight and wide application range Wide, easy-to-operate effects

Inactive Publication Date: 2011-12-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Firstly, due to the relatively small amount of single-line laser information, the operation method is relatively limited. For example, when measuring steps and seams, the vertical projection of the laser line must be guaranteed; secondly, the applicable range of single-line laser detection is relatively small and the stability is not high; third, single-line laser detection The accuracy of laser measurement is not high

Method used

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  • Three-dimensional information detection method based on two-line laser
  • Three-dimensional information detection method based on two-line laser
  • Three-dimensional information detection method based on two-line laser

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Embodiment Construction

[0033] specific implementation plan

[0034] The present invention will be described in further detail below with reference to the accompanying drawings.

[0035] (1) The principle of the two-line laser projection model is as follows: figure 1 . The first laser and the second laser are placed in parallel, and project laser beams perpendicularly to the surface of the measured object. After the first laser plane and the second laser plane are projected onto the object surface, two laser light bars will be formed on the object surface. Both bars of light are modulated by changes in the depth of the object's surface. The camera captures an image containing the two laser light bars from another location. Then through the internal parameters and external parameters of the camera and the two laser plane equations, the three-dimensional information on the light strip of the modulated image can finally be obtained.

[0036] (2) Two-line laser plane calibration. Schematic diagram ...

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Abstract

The invention discloses a three-dimensional information detection method based on dual laser and belongs to the technical field of three-dimensional measurement. The method comprises the following steps of: adopting two lasers, and respectively solving laser plane equations of the first laser and the second laser; collecting an object image containing dual laser by utilizing a camera in the eventof detecting the three-dimensional information of an object, and solving a centre line of each laser thick line; and rebuilding three-dimensional data by utilizing inner parameters of the camera and the laser plane equations of both lasers. Compared with the single-laser measurement method, because of large information amount, the method disclosed by the invention specifically has higher stability, reliability and accuracy; and simultaneously, the operation requirements are simple, thus the method has the important application in detecting the surface three-dimensional information of objects.

Description

technical field [0001] The invention relates to a two-line laser-based three-dimensional information detection method, which belongs to the technical field of machine vision detection. Background technique [0002] In modern manufacturing, the detection of three-dimensional information is essential. At present, most of the existing three-dimensional detection devices are manually detected, and the efficiency is relatively low; in addition, in some precision instrument manufacturing industries (such as automobiles and aircrafts), contact measuring instruments are not easy to install, or due to contact with the surface of the measured object There will be scratches, etc., so the optical-based non-contact measurement technology has been greatly developed. This technology has been widely used in product design and manufacturing, quality inspection and control, machine vision and other fields. [0003] Most of the existing optical-based three-dimensional detection devices are in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01B11/14G01B11/24
Inventor 崔海华戴宁田忠运程筱胜廖文和
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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