Correlation Analysis of Digital Images of Flows with Subpixel Accuracy
N. A. Fomin, O. V. Meleeva
Lykov Institute of Heat and Mass Transfer, National Academy of Sciences of Belarus
ollired@yandex.ru
Keywords: speckle photography, subpixel resolution, boundary layer, shock waves
Pages: 82-89
Abstract
New algorithms for processing noisy specklegrams are described which allow quantitative diagnostics of the microstructure of shock-wave flows with subpixel accuracy with the use of statistical analysis of the speckle fields recorded numerically and perturbed by refraction in the studied flows. The developed software makes it possible to recover up to 10,000 vectors of deflection angles of the probing radiation in a two-dimensional region 20 × 30 mm in size in a speckle field image with a magnification M = 1.
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