Posted by
Herbie on
Oct 23, 2017; 8:47am
URL: http://imagej.273.s1.nabble.com/Eastimation-signal-to-noise-ratio-on-imageJ-tp5019580p5019584.html
Dear,
mean values don't help for the evaluation of the S/N-ratio. You need at
least the alternating powers.
But things aren't as easy as one may think and one should consider that
noise may be non-additive. Furthermore, it may be helpful to know the
Fourier-spectral dependence of the S/N-ratio.
For a 2x2 binning one could in theory expect a reduction of uncorrelated
(photon) noise by a factor of two.
Just some thoughts
Herbie
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Am 22.10.17 um 17:18 schrieb thpnick688:
> Hi, everyone,
> I have encountered a question on estimating signal to noise ratio on
> imageJ. I have an image with 4x4 binning. The binning is done by the CCD
> detector not by the software. I use the ROI to measure the mean gray level
> intensity on the main object in the image. I also use the same size ROI on
> the background to measure the background noise. I use the simple equation
> "S/N= “mean gray level intensity in subject” / “mean gray level intensity of
> the noise”" to estimate the signal to noise ratio. However, by comparing
> with an image that is unbinned, I didn't see the SNR is improved after the
> calculation. So, what mistakes did I make?
>
> RL
>
>
>
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