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Optical hybrid detection method for 3D contours

A technology of optical mixing and detection method, applied in the field of optical detection, which can solve the problems that laser cannot be projected and light knife scanning cannot be realized

Active Publication Date: 2017-05-31
XIAN CHISHINE OPTOELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The general grating method is white light projection, which cannot realize light knife scanning; the laser cannot project the grating, so the mixed measurement of the two methods cannot be realized through the same light source

Method used

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  • Optical hybrid detection method for 3D contours
  • Optical hybrid detection method for 3D contours
  • Optical hybrid detection method for 3D contours

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Embodiment Construction

[0031] The present invention is described in further detail below in conjunction with accompanying drawing:

[0032] see figure 1 , figure 2 , image 3 with Figure 4 , an optical hybrid detection method for three-dimensional profile, which uses the same measurement system to realize two measurement methods of light knife and grating without adding any hardware equipment.

[0033] Step 1: Realize laser light knife and grating projection through MEMS laser projector

[0034] Firstly, the camera self-adaptively identifies the surface reflectance characteristics of the object, that is, collects the grating image of the object to be measured before measurement and calculates the grayscale distribution and the contrast of the image. If the contrast is lower than the set threshold or the grayscale reaches 255, the area selects the light knife measurement mode. , and set this area as ROI to prepare for subsequent reconstruction, and select the raster measurement mode for the res...

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Abstract

The invention discloses an optical hybrid detection method for 3D contours, comprising the following steps: S1, laser cutter and grating projection is implemented through an MEMS laser projector; and S2, matching is carried out, the parallax is calculated, and reconstruction is carried out based on the parallax and binocular stereo vision. Laser cutter-based and grating-based hybrid measurement is completed in the same measurement system through an MEMS projection technology, and the 3D contours of objects with different surface characteristics can be measured quickly. A laser cutter-based measurement method and a grating-based measurement method are implemented in the same measurement system without adding any hardware equipment. The projection device adopted can project multiple laser cutters quickly. The accuracy and speed of measurement are improved.

Description

[0001] Technical field: [0002] The invention belongs to the field of optical detection, relates to an optical hybrid detection method of a three-dimensional profile, and is a three-dimensional measurement method of a light knife grating hybrid. [0003] Background technique: [0004] Three-dimensional scanning technology is more and more widely used. In order to realize fast and accurate three-dimensional measurement of objects, the stereo vision method of multi-camera shooting and the structured light method of fringe projection are usually used. The traditional phase-shift profilometry method can measure objects with any curved surface shape and has a wide measurement range, but this method has calibration difficulties and reflectivity problems; the binocular stereo vision method has a simple measurement system but has problems in matching. Combining these two methods, using the absolute phase value measured by the phase shift profilometry method to assist the stereo vision...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
CPCG01B11/2536G01B11/2527G02B26/105G02B27/30G06T7/521G01B11/2518G02B26/085
Inventor 李玉勤李欢欢李泉马力郭迪姚东
Owner XIAN CHISHINE OPTOELECTRONICS TECH CO LTD
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