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- W1996219023 abstract "Strong background reflections in PIV images are known to bias velocity estimates and their concomitant statistical ensembles. Many methods have been developed to eliminate background reflections, with the common premise of generating a reference background intensity map that is then subtracted from each individual PIV image prior to interrogation. This reference background intensity map can be generated in several ways, including acquiring a background image without particles, calculating the average or minimum intensity map based on an ensemble of PIV images, generating a reference intensity map for each individual PIV realization by means of various local sliding filters or considering the second frame of any PIV realization as its reference intensity map. Motivated by the need to suppress background reflections in a PIV study of flow over highly irregular surface roughness that generated significant diffuse background reflections from the complex topography, the efficacy of these methods was studied. It was found that all failed to adequately suppress such reflections, rendering the resulting velocity fields biased. A local-median normalization algorithm was developed to further suppress background reflections and this note reports the performance of this modified algorithm compared to those previously reported in the literature." @default.
- W1996219023 created "2016-06-24" @default.
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- W1996219023 date "2013-01-15" @default.
- W1996219023 modified "2023-09-26" @default.
- W1996219023 title "Robust suppression of background reflections in PIV images" @default.
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- W1996219023 doi "https://doi.org/10.1088/0957-0233/24/2/027003" @default.
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