Two-line structure light-based online welding seam forming visual detection method

A line-structured light and visual detection technology, applied in the field of computer vision, can solve problems such as roughness evaluation and affecting the accuracy of welding quality evaluation, and achieve the effect of improving calibration accuracy and 3D reconstruction accuracy

A line-structured light and visual detection technology, applied in the field of computer vision, can solve problems such as roughness evaluation and affecting the accuracy of welding quality evaluation, and achieve the effect of improving calibration accuracy and 3D reconstruction accuracy

CN108335286APending Publication Date: 2018-07-27NANJING UNIV OF SCI & TECH
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  • Two-line structure light-based online welding seam forming visual detection method
  • Two-line structure light-based online welding seam forming visual detection method
  • Two-line structure light-based online welding seam forming visual detection method

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Embodiment 1

[0035] as attached figure 1 As shown, the online weld forming visual inspection method based on two-line structured light of the present invention includes a motherboard 1, a welding torch 2, a laser 3, a laser beam splitter 4, and a CCD camera 5; the laser 3 is placed vertically with the welding motherboard 1 , the laser beam splitter 4 and the laser device 3 are placed together, and the laser beam splitter 4 produces two parallel laser lines, which are irradiated on the welding mother board 1, respectively located at the front and rear positions of the welding torch 2; the CCD camera 5 selects a suitable angle, Ensure that two parallel laser lines can be observed. According to attached figure 1 A device for visual inspection of online forming welds, comprising the following steps:

[0036] Step 1: Select the checkerboard as the calibration plate, select two modes of high exposure time and low exposure time, and shoot the line structured light in the same calibration image ...

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Abstract

The invention discloses a two-line structure light-based online welding seam forming visual detection method. The method comprises the steps of sampling a calibration board under different exposure time to realize calibration of line structure light; after three-dimensional reconstruction, correcting reconstruction results on a mother board by using a standard plane; and finally in combination with three-dimensional reconstruction results of continuous line structure light, performing matching on two three-dimensional curved surfaces, thereby obtaining three-dimensional data of a same positionon the mother board before and after welding on line; and obtaining results of roughness, height, width and the like of a welding seam on line. According to the method, a relatively good result can be obtained under the condition of the uneven mother board such as surfacing or the like; a function can be realized under the condition of the even mother board; the calibration precision and the three-dimensional reconstruction precision can be effectively improved; and a welding seam forming result is subjected to multi-angle analysis.

Description

technical field [0001] The invention belongs to the field of computer vision, and in particular relates to an online welding seam forming visual detection method based on two-line structured light. Background technique [0002] At present, the evaluation of welding quality is mainly realized by controlling the size of the weld seam during the weld seam forming process. At present, the main sensing methods used at home and abroad include: ultrasonic sensing, arc sensing, infrared sensing and visual sensing. Compared with other measurement methods, the three-dimensional measurement of the weld seam by line structured light has the advantages of no contact, low price, and no radiation, and can realize real-time, fast and high-precision three-dimensional reconstruction of the weld seam [0003] In order to obtain correct three-dimensional information, the parameters of the line structured light must be determined, that is, the pose relationship between the line structured light ...

Claims

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Application Information

Patent Timeline
27 Jul 2018
Publication
CN108335286A
IPC
G06T7/00; G06T7/80; G01B11/30
CPC
G06T7/0004; G06T7/85; G01B5/0037; G01B11/30; G06T2207/10028; G06T2207/30208; G06T2207/30152
Inventors
韩静; 于浩天