R: R: I: HELP

Posted by SureAndClean on Oct 01, 2014; 9:39am
URL: http://imagej.273.s1.nabble.com/HELP-tp5009737p5009842.html

Hello Giorgio,

thanks for your answer and suggestion. I will take the image with different light angle and sources.
Consider that the holes are not regular in their shape. I post here 2 images before and after the filling of a surface where the open and closed holes are more evident. Moreover, I outlined the open holes by marking the surface with a black permanent marker and cleaning it with Ethanol. Where there are open holes, it's visible a black mark. When the holes are sealed via a sol gel reaction you can perceive them as glassy circles.
Hope this is more clear,

Thanks,

Stefano



-----Messaggio originale-----
Da: ImageJ Interest Group [mailto:[hidden email]] Per conto di Giorgio De Nunzio
Inviato: mercoledì 1 ottobre 2014 09:46
A: [hidden email]
Oggetto: Re: R: I: HELP

Ciao Stefano,
I am curious about your image. I think the most difficult thing would be to infer something about hole depth. Perhaps you need some sort of fixed light, with well-defined incidence angle on the sample, so that depth can somehow be related to grey levels.
Anyway, before all you must locate those poor-contrast spots, avoiding noise.
As you say that the purpose is comparison with a filled-hole image, I think you could post the corresponding image after chemical treatment, so that we can compare themspot by spot and get some ideas.
Are all the dark spots holes? Some of them are darker than others, some are more regular, some show a clearer disk with a central well-defined small dark circle. I think you might describe your image in more details.
Best regards
Giorgio

--
Dr. Giorgio De Nunzio
Dipart. di Matematica e Fisica "Ennio De Giorgi", Univ. del Salento INFN Sezione di Lecce ADAM (Advanced Data Analysis in Medicine) srl Lecce (Italy) [hidden email] [hidden email] tel [phone]-297051 fax [phone] mobile [phone]


Il 01/10/2014 08:39, SureAndClean ha scritto:

> Hello Volko,
>
> many thanks for your answer.
>
> I try to be more specific: I examine with an USB microscope (140 X) a ceramic flat surface.
> The surface presents open holes whose average diameter is less than 0.1 mm.
> My need is to be able, by elaborating the images I take, to create a sort of map where I outline the open holes and to get an idea of their depth (comparative purpose only).
> This since I would like to compare the surface after chemical treatments meant to seal the holes.
>
> Many thanks in advance,
>
> Greetings,
>
> Stefano
>
>
>
>
>
> -----Messaggio originale-----
> Da: ImageJ Interest Group [mailto:[hidden email]] Per conto di Volko Straub
> Inviato: mercoledì 1 ottobre 2014 08:00
> A: [hidden email]
> Oggetto: Re: I: HELP
>
> Hi Stefano,
>
> Could you be a bit more specific what you actually try to measure? The image is not very clear and I doubt that you will get any useful data from such an image, but I am not an expert on 'porosity'. Perhaps if you could specify more clearly what you actually try to measure and indicate the structures that you are interested in, you might stand a better chance to get an answer to your question that actually helps you.
>
> Cheers,
> Volko
>
>
> On 01/10/2014 06:40, SureAndClean wrote:
>> Hello,
>>
>>
>>
>> does anyone knows how can I use Image J to check the open porosity of
>> the surface in the attached picture?
>>
>> Thanks a million for your support,
>>
>>
>>
>> Stefano
>>
>>
>>
>>
>>
>>
>>

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