The subpixel resolution of optical-flow-based modal analysis

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• 作者：Jaka Javh ; Janko Slavič ; ^{janko.slavic@fs.uni-lj.si} ; Miha Boltežar
• 关键词：Gradient-based optical flow ; Modal analysis ; Full-field non-contact displacement measurement ; Subpixel resolution ; Operational displacement shapes ; Photogrammetry
• 刊名：Mechanical Systems and Signal Processing
• 出版年：2017
• 出版时间：1 May 2017
• 年：2017
• 卷：88
• 期：Complete
• 页码：89-99
• 全文大小：1800 K
• 卷排序：88

文摘

The pixel intensity level is used for subpixel displacement resolution. The Fourier transform suppresses noise and enables resolution below quantification levels. Simulations and real-world applications in modal analysis. Experimentally identified amplitude of 0.0008 pixel (0.2 μm).