Image Processing Plot Time Velocity

Hello,

I'm doing experiments using an High Speed Camera to record flame transitions inside of pipe. I wanna make some calculations from this videos (or frames) and transform into graphics. Example - Plot of: time x velocity; time x vector velocity; time x vorticy; etc.

I have several frames for an high speed camera record. Current, I’m doing 2D recording but I’m setting up the 3D too.

This frames are flame explosion flowing in the T pipe. (I’m doing experiments with powder TiO2 inside too cause I wanna try to make PIV too). And one of the record, I put a mesh with 2mm square.

https://drive.google.com/file/d/0By4di7w-iTXAZlFFUGZBNEF6aTQ/view?usp=sharing https://drive.google.com/open?id=0By4di7w-iTXAclNfTHVfNldTSFU

From the experiment without powder, I wanna take data from the images: velocity; vector velocity; vorticity; and anything is possible.

I though in this way but I dont know how to do it exactly and I dont know if it’s correct.

I’m thinking to converge the Image RGB to a Matrix: https://de.mathworks.com/help/matlab/creating_plots/image-types.html

Each frame has the own matrix. Try to put an array from each frame and with this represent the deltaT (0,001s).

And manipulate these matrix in the way (maybe using statistical tools) I can normalize to have an graph with velocity x time, where the location would be pixel variation inside of the matrix and the time the the deltaT of each frame.

Someone had done this? or knows if it's possible?

Thanks Vitor

Answer 1

[Image Analyst]

I have not done exactly that but I have done dynamic scene analysis of course. So, to answer your question: yes it's possible. Simply store your velocity values for each frame and call plot() to plot them. Of course you can normalize the curves, if you want, with normal run-of-the-mill mathematical operations - no special stats functions needed.

[vitor gabriel]

First: Thank you for answer.

Do you know a plugin or tool which I can do this? I know PIVlab and OpenPIV but I don't have particles so doesn't.

[Image Analyst]

I do know how to record a value into an array and plot it after the loop - it's just standard MATLAB code.

Your question seemed to be directly on saving the velocity (once you have it) on each frame and normalizing it, rather than on how to compute velocity in the first place.

I do not know any PIV software package and can't give any suggestions on analyzing your images, especially since I haven't seen any of them.