Thesis
Three-dimensional wave measurement by image processing
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2024
- Thesis identifier
- T16936
- Person Identifier (Local)
- 201866286
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- The free surface of water serves as a reservoir of vital information for understanding the dynamics of oceans, making accurate measurement imperative. Various wave probes have been developed to fulfil this purpose, each employing distinct principles to capture the nuances of the free water surface. From resistance and capacitance wave probes to ultrasonic wave probes and pressure transducers, these devices provide precise measurements but are not without limitations. In response to these challenges, researchers have sought alternative approaches, and this thesis delves into the integration of the Stereo vision principle as a contactless method for ocean wave measurement. Beyond traditional marine research, the foray of the Department of Computer Science into computer vision, emulating the human visual system, presents a unique opportunity. This interdisciplinary synergy harnesses mathematical algorithms and image processing techniques to detect objects and characters within images and videos, with applications extending to ocean and marine engineering. The thesis unfolds with a background exploration of wave measurement techniques, comparing traditional methods with emerging optical technologies. The cross-disciplinary potential of computer vision and marine science is highlighted as a promising avenue for non-contact wave measurement, offering advancements in accuracy and efficiency. The subsequent sections detail a novel approach utilising stereo vision and structured light for contactless full-field measurement of water waves. This method proves adaptable, allowing customisation of measurement speed and data points, with confirmed sub-millimetre accuracy through validation tests. A comparative analysis is provided, evaluating resistance wave probes, ultrasonic wave probes, and optical technology, offering valuable insights into wave measurement techniques. The study addresses limitations in understanding spatial distribution within an Oscillating Water Column (OWC) device, showcasing the effectiveness of optical wave measurement in exploring complex dynamics within the OWC device. Further investigations include the study of a small underwater ellipsoid in motion, providing detailed wave field results. The research chapter concludes by employing the optical measurement technique to investigate water surface height information during the entry of an underwater ellipsoid and a floating box into a lock. These findings contribute to an enhanced understanding of lock entry hydrodynamics, providing a foundation for numerical simulations and advancing knowledge in maritime engineering. In summary, the integration of optical techniques and computer vision emerges as a transformative approach, revolutionising the study and comprehension of dynamic water surfaces in marine research.
- Advisor / supervisor
- Yuan, Zhiming
- Resource Type
- DOI
关系
项目
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PDF of thesis T16936 | 2024-05-21 | 公开 | 下载 |