Re: Turbulent Jet Morphology?

Posted by Herbie on Jan 19, 2020; 12:31pm
URL: http://imagej.273.s1.nabble.com/Turbulent-Jet-Morphology-tp5022840p5022841.html

Good day Frank,

This is a really impressive image...

It looks like a case for regional fractal analyses, though I'm not an expert
in this field.

<http://imagej.1557.x6.nabble.com/file/t380516/Test_005_Fluorescent_Dye_enhanced_UCB-FML-Y3.png>
Attached please find a binary version of the central 512x512 image portion.
I've first applied an ImageJ-bandpass filter with parameters 40, 10 and then
used the automatic threshold scheme "MaxEntropy".
(The binarized result strongly depends on the filter parameters and the
threshold scheme. It is up to you to determine the dependency of the fractal
analyses on theses parameters. If there isn't a great dependency, the
approach may be useful.)

The binary image may serve for fractal analyses such as "Box Counting" etc.
<https://en.wikipedia.org/wiki/Box_counting>

HTH

Herbie

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Frank Shaffer wrote

> Attached is an image from a high-speed video showing turbulence eddies of
> a submerged jet (UC Berkeley Fluid Dynamics Lab).  We would like to
> characterize the morphology (sizes, length scales, etc.).  
>
> Any suggestions for tools to use in ImageJ?
>
> Thank you,
> Frank Shaffer
>
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>
>
> Test_005_Fluorescent_Dye_enhanced_UCB-FML-Y3.2-S1 Camera.jpg (270K)
> &lt;http://imagej.1557.x6.nabble.com/attachment/5022840/0/Test_005_Fluorescent_Dye_enhanced_UCB-FML-Y3.2-S1%20Camera.jpg&gt;

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