Turbulent Jet Morphology?
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Re: Turbulent Jet Morphology?
 
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Re: Turbulent Jet Morphology?
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In reply to this post by Frank Shaffer
I thank everyone for excellent suggestions. However, I have not been able to get good results when trying to recognize the turbulent eddies. So I reverted to a method we developed that detects the edges of the eddies, and from that, determines the length scales of the turbulent eddies. This is described in our paper that's been accepted for publication by the Journal of Fluid Mechanics. We use smoothing with a median filter. This smoothes but preserves edges. Then we apply Canny edge detection. I implemented this in ImageJ. An example result is attached.
Thanks again for all of your suggestions! Frank Shaffer -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html |
Test_009_H20_Fluorescent_Dye_Eddy_Length_Scales.jpg (438K)
Re: Turbulent Jet Morphology?
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In reply to this post by Peter Haub
Dear Peter,
you need to login to Nabble and reply to a message. Then above the text-input area you find various options and drop-down menus. The last one shows the desired upload feature (see attached screenshot). Good luck Herbie :::::::::::::::::::::::::::::::::::::::: Am 22.01.20 um 12:41 schrieb Peter Haub: > Thank you Herbie. > I am logged in at <http://imagej.1557.x6.nabble.com/> > but I can't find the place / button / option where I can upload something. > > Thanks also for pointing to the original question. I have already > registered the communication regarding this issue. > I think I kind of over-prioritize the little "etc." in the original > email and thought that optical flow is kind of analyzing morphological > changes in time .. so something with morphology > :-) > > Regards > Peter > > On 22.01.2020 12:20, Herbie wrote: >> Dear Peter, >> >> I did the upload via Nabble: >> <http://imagej.1557.x6.nabble.com/> >> >> I'm not aware of a certain size limit, although there must be some >> limitation. >> >> ========================= >> >> Apart from this formal question, I should like to again point out that >> the OP (Frank Shaffer) likes to characterize the *morphology* of jets >> in *single* images. Originally he 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.)." >> >> More recently Frank confirmed that he is interested in jet >> characterization from single images: >> >> "The feature recognition only needs to work on one image. Then it can be >> repeated for the other images." >> >> That said, I'm not sure if "Optical Flow" that is based on image >> sequences, not single images, may help to characterize the jet >> morphology. >> >> Regards >> >> Herbie >> >> :::::::::::::::::::::::::::::::::::::::: >> Am 22.01.20 um 12:04 schrieb Peter Haub: >>> @Herbie >>> Hi Herbie, maybe you can explain how I can upload a file to the mail >>> server and attache the link in my email .. as you did in one of your >>> emails. >>> >>> (Is there a size limit ?) >>> >>> Thanks >>> and regards >>> Peter >>> >>> >>> -------- Forwarded Message -------- >>> Subject: Re: Turbulent Jet Morphology? >>> Date: Tue, 21 Jan 2020 19:25:24 +0100 >>> From: Peter Haub <[hidden email]> >>> To: ImageJ Interest Group <[hidden email]>, [hidden email] >>> >>> >>> >>> Hi Frank, >>> >>> have you tried to analyze the optical flow in your video? >>> >>> The the attached example (in the zip archive) - calculated with the FIJI >>> plugin 'OpticalFlow'. >>> >>> Regards, >>> Peter >>> >>> >>> On 20.01.2020 14:08, Frank Shaffer wrote: >>>> I don't have experience with the fractal recognition technique. >>>> If anyone would like to try their suggestions on an example video, you >>>> can download it here: >>>> >>>> www.FDShaffer.net/Berkeley/Test_009_Fluorescent_enhanced.avi >>>> >>>> It's only 31 frames. >>>> >>>> If you technique works well, I will be happy to give you credit in our >>>> publications. >>>> >>>> Thanks, >>>> Frank Shaffer >>>> FDShaffer.Net >>>> >>>> -- >>>> ImageJ mailing list: http://imagej.nih.gov/ij/list.html >>>> >>> >>> >>> >>> -- >>> ImageJ mailing list: http://imagej.nih.gov/ij/list.html >> > > -- > ImageJ mailing list: http://imagej.nih.gov/ij/list.html -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html |
Re: Turbulent Jet Morphology?
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