Hub weld joint three-dimensional characteristic measuring device and method based on line laser rotation scanning
A technology of rotating scanning and measuring device, applied in measuring device, using optical device, image analysis and other directions, can solve the problems of wasting labor resources, unable to accurately and quickly obtain three-dimensional features of weld contour, unable to complete detection efficiently, etc. Meet the requirements, meet the detection accuracy and the effect of real-time detection
Active Publication Date: 2022-01-28
NANJING UNIV OF SCI & TECH
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Problems solved by technology
However, at present, the detection of three-dimensional shape features of most objects relies on manual detection assisted by standard detection devices, which not only wastes a lot of labor resources, but also cannot complete the detection work efficiently.
At the same time, there is a problem that manual detection cannot accurately obtain the depth information of the three-dimensional shape. For example, the wheel hub weld of the object to be measured cannot accurately and quickly obtain the depth information of the weld contour and the three-dimensional characteristics of the upper edge of the weld.
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[0061] Such as figure 1 As shown, the three-dimensional shape characteristic measurement device of the hub weld based on the line laser rotation scanning includes a line structured light sensor 1, a rotation displacement control system, an LED supplementary light control system and a computer 4. The measurement target is the three-dimensional contour of the hub weld area and the three-dimensional reconstruction of the upper edge of the weld.
[0062] The calibration accuracy of the vision sensor of the present invention and the central axis of the rotary table determines the accuracy of the three-dimensional measurement of the line laser rotary scanning. The coordinates of the center point of the light strip extracted by the industrial camera are all in the pixel coordinate system (o-u,v). The coordinate system established with the optical center of the camera as the original center is the camera coordinate system (O c -X c ,Y c ,Z c ). In this embodiment, Zhang Zhengyou...
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The invention discloses a hub weld joint three-dimensional characteristic measuring device and method based on line laser rotation scanning. The device comprises a linear structure light sensor, a rotary displacement control system, an LED light supplement lamp control system and a computer; the line structure light sensor is composed of a line laser and an industrial camera, the rotary displacement control system is composed of a rotary table and an electric control table controller, and the LED light supplementing lamp control system is composed of an LED and a light source controller; the measuring method comprises the following steps: acquiring a gray image and a line laser stripe image of a hub welding seam area by using a line structured light sensor, reconstructing a three-dimensional point cloud of a hub welding seam contour through image processing, and analyzing and obtaining welding seam depth information; using a double-input improved U-Net network to predict a welding seam area for the acquired interested area image, and predicting the three-dimensional data of the upper contour of the welding seam in combination with the light strip image information. The device and method have the advantages of simple device, high measurement precision, real-time detection and the like.
Description
technical field [0001] The invention relates to the technical field of three-dimensional reconstruction based on line structured light, in particular to a device and method for measuring three-dimensional features of hub welds based on line laser rotation scanning. [0002] technical background [0003] Three-dimensional measurement technology is widely used in the field of surveying and mapping engineering, structural measurement and even entertainment industry. The main implementation methods of three-dimensional measurement include contact three-dimensional measurement method represented by traditional three-dimensional coordinate measuring machine and non-contact three-dimensional measurement technology. The former has mature measurement precision technology, but due to its characteristics of contact measurement with the measured object, the measurement process will cause damage to the surface of the measured object. At present, the latter three-dimensional measurement m...
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IPC IPC(8): G06T7/80G06T7/66G06T7/50G06T7/155G06T7/13G06T7/11G06T5/00G06T17/00G01B11/24
CPCG06T7/85G06T7/66G06T7/11G06T7/13G06T7/155G06T7/50G06T17/00G01B11/24G06T5/70
Inventor 宋旸杜思月
Owner NANJING UNIV OF SCI & TECH