Filtered refocusing: a volumetric reconstruction algorithm for plenoptic-PIV. (11th August 2016)

• Record Type: Journal Article
• Authors: Fahringer, Timothy W; Thurow, Brian S
• Is Part Of: Measurement science & technology. Volume 27:Number 9(2016:Sep.)
• Publication Date: 2016-08-11
• Subjects: light field imaging -- particle image velocimetry -- volumetric reconstruction; Physical measurements -- Periodicals; Scientific apparatus and instruments -- Periodicals; Equipment and Supplies -- Periodicals; Science -- instrumentation -- Periodicals; Technology -- instrumentation -- Periodicals; Mesures physiques -- Périodiques; Physical measurements; Scientific apparatus and instruments; Periodicals; 502.87
• DOI: 10.1088/0957-0233/27/9/094005
• Languages: English
• ISSNs: 0957-0233

Abstract

Abstract: A new algorithm for reconstruction of 3D particle fields from plenoptic image data is presented. The algorithm is based on the technique of computational refocusing with the addition of a post reconstruction filter to remove the out of focus particles. This new algorithm is tested in terms of reconstruction quality on synthetic particle fields as well as a synthetically generated 3D Gaussian ring vortex. Preliminary results indicate that the new algorithm performs as well as the MART algorithm (used in previous work) in terms of the reconstructed particle position accuracy, but produces more elongated particles. The major advantage to the new algorithm is the dramatic reduction in the computational cost required to reconstruct a volume. It is shown that the new algorithm takes 1/9th the time to reconstruct the same volume as MART while using minimal resources. Experimental results are presented in the form of the wake behind a cylinder at a Reynolds number of 185.