I need your help....

[nightfly]

Hello I'm an engineer from Italy and I need your help.
I have this image:

http://imageshack.com/a/img909/6421/PgJ66O.jpg

It is the result of a traction test between two steel bars glued together.
Now there are some glue residues on both the glued faces and I need to measure that.
The glue residues are the higher areas visible in the pic.
How can I do that? Is it possible with ImageJ?

Many thanks to all!
 

[audrey karperien-3]

Lacunarity analysis might be appropriate, using the FracLac plugin. You might also want to check out Comparing monofractal and multifractal analysis of corrosion damage... - PubMed - NCBI   using mono- and multi-fractal analysis. I can help with FracLac if needed. Give me a shout.

Best,Audrey


 


      From: nightfly <[hidden email]>
 To: [hidden email]
 Sent: Tuesday, January 27, 2015 12:48 PM
 Subject: I need your help....
   
Hello I'm an engineer from Italy and I need your help.
I have this image:

http://imageshack.com/a/img909/6421/PgJ66O.jpg

It is the result of a traction test between two steel bars glued together.
Now there are some glue residues on both the glued faces and I need to
measure that.
The glue residues are the higher areas visible in the pic.
How can I do that? Is it possible with ImageJ?

Many thanks to all!
 







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|   |
|   |   |   |   |   |
| Comparing monofractal and multifractal analysis of corrosion damage... - PubMed - NCBIPLoS One. 2012;7(1):e29956. doi: 10.1371/journal.pone.0029956. Epub 2012 Jan 6. Comparative Study; Evaluation Studies; Research Support, Non-U.S. Gov't |
|  |
| View on www.ncbi.nlm.nih.gov | Preview by Yahoo |
|  |
|   |

   

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[John Cahill]

I can see two different textured areas in the circular sample. One between
12 and 4 o'clock the other between 4 and 12. Are these the two areas you
want to measure? How accurate do you need the measurement? How reproducible
do you need the measurement? Do you have many samples and need to automate
the measurement?
 A simple approach, if accuracy and reproducibility are not critical, would
be to manually draw around the features using ImageJ then make area
measurements.
Automation is a challenge because of lack of contrast between the two areas.
You could try to generate contrast by using polarised light illumination,
or try staining the resin with a suitable dye. If successful this will
allow you to set a threshold to differentiate the two areas.
This video is a good introduction to measuring area using ImageJ
https://www.youtube.com/watch?v=nLfVSWcxMKw
cheers,
John


On Tue, Jan 27, 2015 at 12:48 PM, nightfly <[hidden email]> wrote:

> Hello I'm an engineer from Italy and I need your help.
> I have this image:
>
> http://imageshack.com/a/img909/6421/PgJ66O.jpg
>
> It is the result of a traction test between two steel bars glued together.
> Now there are some glue residues on both the glued faces and I need to
> measure that.
> The glue residues are the higher areas visible in the pic.
> How can I do that? Is it possible with ImageJ?
>
> Many thanks to all!
>
>
>
>
>
>
>
>
> --
> View this message in context:
> http://imagej.1557.x6.nabble.com/I-need-your-help-tp5011332.html
> Sent from the ImageJ mailing list archive at Nabble.com.
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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ImageJ mailing list: http://imagej.nih.gov/ij/list.html

[nightfly]

Thank you Audrey,

I read that this plugin works only with binary images, is it true? Unfortunately i'm not working on binary pics.

[nightfly]

Thank you John,

Yes, you really got what I mean.
And yes I need to automate the process because of the number of samples to analyze.
I saw the video you linked and was very helpful: I need more color on the sample.
For the moment I colored the resin area whit photoshop and obtained a quite good result with threshold method.  

[audrey karperien-3]

FracLac also works on grayscale.  You have to select "grayscale" at the top or it will think you want to threshold to binary.
 

      From: nightfly <[hidden email]>
 To: [hidden email]
 Sent: Wednesday, January 28, 2015 10:44 AM
 Subject: Re: I need your help....
   
Thank you Audrey,

I read that this plugin works only with binary images, is it true?
Unfortunately i'm not working on binary pics.




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