KEYWORDS: Cameras, 3D modeling, Calibration, Imaging systems, Motion models, Visual process modeling, Motion analysis, Data modeling, 3D acquisition, Data acquisition
With its incomparable advantages over other motion capture technologies, the application of optical motion capture systems has become more and more extensive, and it has become a major technical means for obtaining motion data. This paper mainly studies the camera calibration and 3D reconstruction technology of the optical motion capture system based on the marker, and designs an optical motion data capture system, which describes the acquisition of three-dimensional motion data, as well as the processing and analysis of motion posture feature data. By summarizing the methods and techniques of camera calibration, marker point placement, and motion drive, it effectively solves the problems of data jitter, data point loss, motion distortion, etc. generated during the motion capture process.
The cable is the most important part of suspension bridge, which is related to the structural safety, and can easily be damaged by environmental factors. It is difficult to record and feedback the damage of the cable in suspension bridge with the existing non-destructive measurement technology. It is also very difficult to calculate the extent and location of the cable damage according to the measurement results. By using two-parameter distributed fiber optical sensor, the strain, amplitude and frequency of the cable can be measured accurately at the same time, and the information for damage identification of the cable can be directly fed back in time. According to the characteristics of the cable, the key parameters measured by the two-parameter distributed fiber optical sensor can also be further calculated, and the results will be verified by each other to improve the accuracy and reliability of the test. The two-parameter distributed fiber optical sensor can realize long-term detection, which is beneficial to the integrity and reliability of the operating information of suspension bridge.
The investigation shows that the difficulties students encounter in the course of optics are mainly due to the abstraction of the content of the optical course, and the problem that the description of the physical phenomenon and process is difficult to show in the classroom teaching. We consider to integrate information technology with classroom teaching. Teachers can set up course websites and create more teaching resources, such as videos of experimental processes, design of simulated optical paths, mock demonstration of optical phenomena, and so on. Teachers can use the courseware to link the resources of the website platform, and display the related resources to the students. After class, students are also able to learn through the website, which is helpful to their study.
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