Cracks

[Ivan Jerman]

Dear Sir,

I need to calculate the lenght of the cracks on image like enclosed. My question is if it is possible with ImageJ.
I would be very pleased if there is some plugin for this task.

Looking forward,

Ivo


doc. dr. Ivan Jerman

Laboratory for Materials Chemistry

[KI_napis]

National Institute of Chemistry
Hajdrihova 19
SI-1000 Ljubljana

Phone: [phone]
Mobile:[phone]
Fax:       [phone]
www.ki.si<http://www.ki.si/>
skype: ivo-jerman



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[Ivan Jerman]

Dear Sir,

I need to calculate the lenght of the cracks on image like enclosed. My question is if it is possible with ImageJ.
I would be very pleased if there is some plugin for this task.

Looking forward,

Ivo


doc. dr. Ivan Jerman

Laboratory for Materials Chemistry

[KI_napis]

National Institute of Chemistry
Hajdrihova 19
SI-1000 Ljubljana

Phone: [phone]
Mobile:[phone]
Fax:       [phone]
www.ki.si<http://www.ki.si/>
skype: ivo-jerman



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[Gabriel Landini]

On Tuesday 02 Sep 2014 07:57:52 Ivan Jerman wrote:
> I need to calculate the lenght of the cracks on image like enclosed. My
> question is if it is possible with ImageJ. I would be very pleased if there
> is some plugin for this task.

I think cracks are typically fractal, so "length" will depend on the
resolution of the image. The closer you look, the longer they become.
If you were able to segment the cracks (the image posted is not clear), I
think that length would not be very useful unless the cracks were pretty much
linear.
Perhaps measuring the fractal dimension of the cracks would tell you something
about their geometry. So you could binarise the cracks, then apply the box
counting command "Analyze>Tools>Fractal box count" to do that.
Cheers

Gabriel

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[Paul van Schayck]

Dear Ivan,

I've trouble determining what are cracks and what is noise in your picture.
I've put together a small macro that may be a base for you to get started.
Note that this requires Fiji (as it uses the Analyze Skeleton plugin)

setAutoThreshold("Default dark");
setThreshold(95, 116);
setOption("BlackBackground", false);
run("Convert to Mask");
run("Skeletonize");
run("Analyze Skeleton (2D/3D)", "prune=none show");

Regards,

Paul



On Tue, Sep 2, 2014 at 9:45 AM, Ivan Jerman <[hidden email]> wrote:

> Dear Sir,
>
> I need to calculate the lenght of the cracks on image like enclosed. My
> question is if it is possible with ImageJ.
> I would be very pleased if there is some plugin for this task.
>
> Looking forward,
>
> Ivo
>
>
> doc. dr. Ivan Jerman
>
> Laboratory for Materials Chemistry
>
> [KI_napis]
>
> National Institute of Chemistry
> Hajdrihova 19
> SI-1000 Ljubljana
>
> Phone: [phone]
> Mobile:[phone]
> Fax:       [phone]
> www.ki.si<http://www.ki.si/>
> skype: ivo-jerman
>
>
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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[Simon_Carr]

Dear Ivan,

As some of the other posts have noted, actually defining/segmenting the crack in your image is a challenge before you get around to measuring them. I have used an approach that maps out the curvature of the image (using the Principal Curvature/Compute Curvature plugin, available from Stephan Preibisch at http://fly.mpi-cbg.de/~preibisch/software.html) does a good job of defining the locations of fibres, cracks or fissures. Once you have done this, some of the tools in BoneJ and the Analyzw Skeleton tools might be of some help.

Regards,

Simon
_________________________________
Dr Simon Carr
Director, Centre for Micromorphology,
School of Geography,
Queen Mary University of London,
Mile End Road, London, E1 4NS, UK.
t: 00 44 20 7882 2780
f: 00 44 20 8981 6276
e: [hidden email]<mailto:[hidden email]>
twitter: @DrSimonCarr, @MicromorphQMUL

On 2 Sep 2014, at 08:45, Ivan Jerman <[hidden email]<mailto:[hidden email]>> wrote:

Dear Sir,

I need to calculate the lenght of the cracks on image like enclosed. My question is if it is possible with ImageJ.
I would be very pleased if there is some plugin for this task.

Looking forward,

Ivo


doc. dr. Ivan Jerman

Laboratory for Materials Chemistry

[KI_napis]

National Institute of Chemistry
Hajdrihova 19
SI-1000 Ljubljana

Phone: [phone]
Mobile:[phone]
Fax:       [phone]
www.ki.si<http://www.ki.si><http://www.ki.si/>
skype: ivo-jerman



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