http://imagej.273.s1.nabble.com/Re-Signal-to-Noise-Ratio-SNR-tp3687073.html
> Bonjour,
>
> I agree with Joachim Wesner's statement but maybe the background of the
> original question is of some importance...
>
> In certain situations approximations, e.g.
>
> S + N / N
>
> may be of some help. See for instance:
>
> <
http://www.gluender.de/Writings/WritingsTexts/HardText.html#Gl-1980-1>
>
>
> Hi there,
>>
>> Sorry but measuring the SNR of a single image without reference or any
>> a-priori-knowledge is simply mathematically IMPOSSIBLE!
>>
>> How do you tell what is true data, what is noise? The human vision system
>> might imply that it is still possible, but this relies on
>> implicit assumptions about object structure and spatial frequency spectrum
>> of the "true" data.
>>
>> Mit freundlichen Grüßen / Best regards
>>
>> Joachim Wesner
>> Projektleiter Optik Technologiesysteme
>>
>> Leica Microsystems CMS GmbH | GmbH mit Sitz in Wetzlar | Amtsgericht
>> Wetzlar HRB 2432
>> Geschäftsführer: Dr. Stefan Traeger | Dr. David Roy Martyr | Colin Davis
>> www.leica-microsystems.com
>>
>> ---------------------
>>
>> Hi,
>>
>> Is there any ImageJ plugin to calculate the Signal-to-Noise Ratio of a
>> single image without a reference image?
>>
>> I've seen some plugins that calculate the SNR of images but in all of them
>> reference images are necessary.
>>
>> Thank you.
>>
>> []s
>> --
>> Anderson Vinícius Alves Ferreira
>> Intern at Lafarge Centre de Recherche
>> 95 rue du Montmurier - 38291 St Quentin-Fallavier - France
>>
>
> Best
> --
>
> Herbie
>
> ------------------------
> <
http://www.gluender.de>
>