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
CN108335286APending Publication Date: 2018-07-27NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2018-07-27

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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.
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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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