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Proceedings Paper

Personal Computer (PC) Based Image Processing Applied To Fluid Mechanics Research
Author(s): Y-C Cho; B. G. McLachlan
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Paper Abstract

A PC based image processing system was employed to determine the instantaneous velocity field of a two-dimensional unsteady flow. The flow was visualized using a suspension of seeding particles in water, and a laser sheet for illumination. With a finite time exposure, the particle motion was captured on a photograph as a pattern of streaks. The streak pattern was digitized and processed using various imaging operations, including contrast manipulation, noise cleaning, filtering, statistical differencing, thresholding, etc. Information concerning the velocity was extracted from the enhanced image by measuring the length and orienta-tion of the individual streaks. The fluid velocities deduced from the randomly distributed particle streaks were interpolated to obtain velocities at uniform grid points. For the interpolation we used a simple convo-lution technique with aM adaptive Gaussian window. The results are compared with a numerical prediction by a Navier-Stokes computation.

Paper Details

Date Published: 18 January 1988
PDF: 5 pages
Proc. SPIE 0829, Applications of Digital Image Processing X, (18 January 1988); doi: 10.1117/12.942134
Show Author Affiliations
Y-C Cho, NASA Ames Research Center (United States)
B. G. McLachlan, NASA Ames Research Center (United States)

Published in SPIE Proceedings Vol. 0829:
Applications of Digital Image Processing X
Andrew G. Tescher, Editor(s)

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