Camera Offset Correction of Image-based Measurements and FPGA System Camera Feasibility

• Main Authors: Chang-Xun Li 李長勳, 李長勳
• Other Authors: 楊元森
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/6373f6

碩士 === 國立臺北科技大學 === 土木與防災研究所 === 101 === Image-based measurement is getting widely used in earthquake engineering structural experiments. Slight camera movement during an experiment is sometimes an inevitable source of measurement errors, which may result in considerable error of stereo triangulation. Camera movement is typically induced by slight tripod deformation, unexpected touching of imaging equipment, outdoor wind, and other factors. This work developed an adjustment method to minimize the error induced by camera movement. This method requires several fixed reference points to be captured in the images. This method estimates the translational and rotational movement of images based on the translational movement of the fixed reference points in the images. Adjusted images are then generated based on estimated movement, and are used for follow-up image analysis process. An RC-rocking experiment conducted at National Center for Research on Earthquake Engineering was used to test the adjustment method. Finally, the feasibility of integrating stereo triangulation image-based analysis and Field-Programmable Gate Array (FPGA) system is discussed in this work.