Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Contrast-enhancement techniques for particle-image velocimetry

Not Accessible

Your library or personal account may give you access

Abstract

In video-based particle-image velocimetry (PIV) systems for fluid mechanics research, it is sometimes desirable to image seed particles to be smaller than a camera pixel. However, imaging to this size can lead to marginal image contrast such that significant numbers of erroneous velocity vectors can be computed, even for simple flow fields. A variety of image-enhancement techniques suitable for a low-cost PIV system that uses video cameras are examined and tested on three representative flows. Techniques such as linear contrast enhancement and histogram hyperbolization are shown to have good potential for improving the image contrast and hence the accuracy of the data-reduction process with only a 15% increase in the computational time. Some other schemes that were examined appear to be of little practical value in PIV applications. An automated shifting algorithm based on mass conservation is shown to be useful for displacing the second interrogation region in the direction of flow, which minimizes the number of uncorrelated particle images that contribute noise to the data-reduction process.

© 2000 Optical Society of America

Full Article  |  PDF Article
More Like This
Two-dimensional particle displacement tracking in particle imaging velocimetry

Mark P. Wernet
Appl. Opt. 30(14) 1839-1846 (1991)

Eliminating background noise effect in micro-resolution particle image velocimetry

Jin-Dong Tian and Hui-He Qiu
Appl. Opt. 41(32) 6849-6857 (2002)

Stereoscopic particle image velocimetry in inhomogeneous refractive index fields of combustion flows

C. Vanselow, O. Hoppe, D. Stöbener, and A. Fischer
Appl. Opt. 60(28) 8716-8727 (2021)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (14)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (3)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (18)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved