Re: Signal-to-Noise Ratio (SNR)

Posted by Anderson Vinícius on Jul 05, 2010; 11:18am
URL: http://imagej.273.s1.nabble.com/Signal-to-Noise-Ratio-SNR-tp3687681p3687687.html

Hi Joachim,

I don't need to measure the exact SNR, an estimation is enough.

I've seen a method in a thesis (http://pastel.paristech.org/4473/, page 25)
that takes the covariance (calculated by a Fourier Transform) and the
morphological opening to define the SNR.
That's why I was wondering if a plugin had already been done to measure the
SNR without a reference image.

[]s
--
Anderson Vinícius Alves Ferreira
Intern at Lafarge Centre de Recherche
95 rue du Montmurier - 38291 St Quentin-Fallavier - France

On 5 July 2010 12:04, Joachim Wesner
<[hidden email]>wrote:

> 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
>
>
>
>
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>             05.07.2010 10:50
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> 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
>
>
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