Roughness from cross-section image

[acavaleiro]

Hello all,

My problem should be relatively simple to solve, but was not able to find it
or to find a solution on the forum. I have a coating that was cut and
polished and prepared in cross-section. What i want to do is to measure the
roughness of that coating using ImageJ in this cross-section image. Any
thoughts on how this could be done?

I tried to use the wand tool to define the outer part of the coating with
success but then i need to take out the x,y values of only the wand
selection cutter part. With this i might try to do a linear interpolation
and afterwards measure the roughness. But i was not able to take out the
coordinates of the wand selection.

Any other thoughts?

Thank all



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[Michael Schmid]

Hi A.,

you could try the following approach (assuming that the surface or
interface is horizontal in your cross-section image):
- Select the lower part of the image up to the surface or interface of
interest
- Create a mask
- Convert to 32-bit (float)
- Adjust image size to one pixel height, but unchanged width, with
interpolation 'none' and 'average when downsizing'. This should give you
the average intensity of the pixel columns.
- Process>Math>Multiply by the original image height (in physical units
such as microns) divided by 255. [because the mask has 255 as foreground
value]
- 'Select all' and create a profile (make sure that 'vertical profile is
not selected in Edit>Options>Plot Options). You can then list or save
the coordinates.

If it works, you can use the macro Recorder to make a macro from it. See
   https://imagej.nih.gov/ij/developer/macro/functions.html
for useful macro functions such as getPixelSize and getProfile().


Michael
________________________________________________________________
On 24/10/2017 10:07, acavaleiro wrote:

> Hello all,
>
> My problem should be relatively simple to solve, but was not able to find it
> or to find a solution on the forum. I have a coating that was cut and
> polished and prepared in cross-section. What i want to do is to measure the
> roughness of that coating using ImageJ in this cross-section image. Any
> thoughts on how this could be done?
>
> I tried to use the wand tool to define the outer part of the coating with
> success but then i need to take out the x,y values of only the wand
> selection cutter part. With this i might try to do a linear interpolation
> and afterwards measure the roughness. But i was not able to take out the
> coordinates of the wand selection.
>
> Any other thoughts?
>
> Thank all

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

[Braekevelt Martin]

Dear,

I have developed peripheral roughness on cross sections of wires 20 years ago, as we follow up roughness of wires during wire drawing process.
All you need is a profile in x,y coordinates in a calibrated image.
Further processing  like cut-off filtering and parameter selections  like Ra, Rt, waviness and others I do with profession software license like Omnisurf, which  is very good and not expensive license.

Hope this helps you further.

Kindest regards,

Martin.

-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of acavaleiro
Sent: Tuesday, October 24, 2017 10:08 AM
To: [hidden email]
Subject: Roughness from cross-section image

Hello all,

My problem should be relatively simple to solve, but was not able to find it or to find a solution on the forum. I have a coating that was cut and polished and prepared in cross-section. What i want to do is to measure the roughness of that coating using ImageJ in this cross-section image. Any thoughts on how this could be done?

I tried to use the wand tool to define the outer part of the coating with success but then i need to take out the x,y values of only the wand selection cutter part. With this i might try to do a linear interpolation and afterwards measure the roughness. But i was not able to take out the coordinates of the wand selection.

Any other thoughts?

Thank all



--
Sent from: http://imagej.1557.x6.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