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Robust optical flow estimation applied to particle image velocimetry images for high resolution velocity measurements

Stryczniewicz W.

Journal of KONES

2018

Vol. 25, No. 1

371--377

The article discusses application of Robust Optical Flow Estimation for increasing of Particle Image Velocimetry measurement resolution. Nowadays, one of the promising approaches for increasing the performance of the PIV systems is application of the Optical Flow Estimation for image analysis. Nevertheless, some of the OF implementations do not perform well in case of motion discontinues typically occurring in the PIV images. The purpose of this study is to validate the performance of the Robust Optical Flow Estimation. The tests were performed on simulated images of vortex flow and the results were compared with displacement fields calculated with the typical correlation PIV algorithm. The velocity for high and medium particle concentration was similar for Optical Flow and PIV-like analysis. Furthermore, the performance of the robust optical flow framework was tested with images corrupted with blurs and occlusions. The tests proved good performance of proposed analysis in case of non-Gaussian sources of measurement errors. The robust estimation framework performed well in the case of common image artefacts and proved to be a promising method for precise PIV flow measurements. The presented approach can be useful in development hybrid OF-PIV post processing software aimed for high-resolution measurements and provide a help in designing of experimental investigation of microscale fluid flow phenomena.

Optical flow estimation based on local measurements and their directional confidences

Toczyski T.

Przegląd Elektrotechniczny

2005

R. 81, nr 3

33-39

A new method of optical fIow field estimation is presented. The method has two steps. In the first step initial optical fIow estimates are computed from local similarities of pixels neighborhoods. Along with every initial estimate, its directional confidence measure is computed. The second step combines these initial estimates. Final optical flow field estimation is computed by solving a large sparse system of linear equations.

W artykule została przedstawiona nowa metoda estymacji pola przepływu optycznego. Metoda składa się z dwóch kroków. W pierwszym kroku liczone są wstępne wektory przepływu optycznego wraz z ich kierunkowymi miarami zaufania. Krok drugi polega na integracji estymat z kroku pierwszego. Ostateczna estymacja pola przepływu optycznego jest obliczana przez rozwiązanie dużego rzadkiego układu równań liniowych.