Abstract
The frequency responses on sub-pixel evaluation techniques have been investigated using the Monte-Carlo technique. The frequency response by the FFT based cross-correlation gives very good results although some gain loss does exist for small displacement (less than 0.5 pixel). Few gain losses are observed in the Direct Cross-Correlation, but the sub-pixel accuracy is limited to be about 0.1 pixel which implies that it could not detect a small displacement. To detect sub-pixel displacement with higher accuracy, the gradient technique with iterative correlation is the best. For a small interrogation area (e.g., 4 × 4), only the gradient technique can detect small displacement accurately.
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Koji Okamoto: He received his M.Sc. (Eng) in Nuclear Engineering in 1985 from the University of Tokyo. He also received his Ph.D in Nuclear Engineering in 1992 from the University of Tokyo. He worked in Department of Nuclear Engineering, Texas A & M University as a visiting associate professor in 1994. He has been working in Nuclear Engineering Research Laboratory, the University of Tokyo as an associate professor since 1993. His research interests are Quantitative Visualization, PIV, Holographic PIV Flow Induced Vibration and Thermal-Hydraulics in Nuclear Power Plant.
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Okamoto, K. Comparison of sub-pixel estimation of PIV using frequency response analysis. J Vis 5, 355–361 (2002). https://doi.org/10.1007/BF03182350
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DOI: https://doi.org/10.1007/BF03182350