Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Smart Structures and Systems Volume 27, Number 3, March 2021 , pages 537-546 DOI: https://doi.org/10.12989/sss.2021.27.3.537 |
|
|
|
Computer vision-based displacement measurement with m-sequence target |
||
Yi-ding Hu, Qi Xia, Rong-rong Hou, Yong Xia and Jian-yi Yan
|
||
| Abstract | ||
| The development of image sensors enables the application of vision-based techniques to the non-contact displacement measurement of large-scale structures. The features of the physical targets are critical to the accuracy, stability and anti-interference of the displacement measurement results. In this study, a novel m-sequence target and the associated circular correlation processing technique are developed for real-time displacement measurement. The properties of the m-sequence as a pseudo-random sequence are introduced. The vision-based displacement calculation method is then derived from the correlation property of the m-sequence. The algorithms and measurement systems are integrated in the LabVIEW environment. To verify the anti-interference performance of the developed system, static and dynamic experimental tests are carried out with various forms of interference, such as partial occlusion, uneven illumination, out of focus and smoke effect. Experimental results indicate that the developed system cannot only accurately measure structural displacement, but also has outstanding antiinterference performance, even if 30% of the target is masked. | ||
| Key Words | ||
| computer vision; m-sequence; displacement measurement; target tracking; structural health monitoring | ||
| Address | ||
| (1) Yi-ding Hu, Jian-yi Yan: Faculty of Intelligent Manufacturing, Wuyi University, Jiangmen 529020, China; (2) Qi Xia: School of Civil Engineering, Southeast University, Nanjing, China; (3) Rong-rong Hou, Yong Xia: Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China. | ||