Re: Flow tracking

Posted by Aryeh Weiss on Jun 24, 2008; 9:20am
URL: http://imagej.273.s1.nabble.com/Flow-tracking-tp3695757p3695764.html

You can start with the "stacks-T functions" plugins which are part of the WCIF
plugins collection (or is is now called MBF?). I think that deltaF-up and
deltaF-down may do it. If you need to do it yourself, you can look in the
example macros on the ij website. For example, StackProfilePlot will show you
how to loop through your stack. The you can take slices n and n-1 (or n+1),
subtract them, and put them in a new stack.

Look at the "SubtractMeasuredBackground" macro on the in
http://rsb.info.nih.gov/ij/macros/SubractMeasuredBackground.txt
It is close to what you want -- just change the constant background to be the
previous (or next) slice.

--aryeh

isadaba wrote:

> Many thanks for your advice.
> Could you please tell the specific plugin for substracting?
>
> It sounds quite interesting.
> Iñaki
>
>
>
>
> Aryeh Weiss wrote:
>> isadaba wrote:
>>> http://www.nabble.com/file/p18052351/2665.bmp 
>>>
>>> http://www.nabble.com/file/p18052351/2734.bmp 
>>>
>>> Dear imageJ users,
>>>
>>> I have recently known about ImageJ and was trying to use it for our
>>> medical
>>> engineering problem. As you can see in the figures the fluid flows
>>> through
>>> the serpentine shape channel, see the advance from one figure to the
>>> other
>>> on the upper serpentine. We need to capture flow motion through the
>>> channel
>>> from video sequence, by automatically tracking position or speed.
>> You might be able to track the advancing front by taking the difference
>> between
>> successive frames. There are plugins that can do this. Then you may be
>> able to
>> use tracking plugins to follow the front.
>>
>> --aryeh
>> --
>> Aryeh Weiss
>> School of Engineering
>> Bar Ilan University
>> Ramat Gan 52900 Israel
>>
>> Ph:  972-3-5317638
>> FAX: [phone]
>>
>>
>