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| tsaab |
11/09/2013 12:53AM (Read 839 times)
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Status: offline
Registered: 03/02/2011
Posts: 8
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How much Poisson noise is added when i am using mknoise?
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| fitz |
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11/09/2013 01:09AM
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Status: offline
Registered: 09/30/2005
Posts: 4040
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From the help page:
Poisson photon noise is generated by setting the poisson parameter.
For new images the input data value is the background while for
existing images the input data value is added to the background
value. The data value is then multiplied by the gain, a poisson
deviate is generated, and divided by the gain. Expressed as a
formula:
New images: out = P(background * gain) / gain
Existing images: out = P((in+background)*gain) / gain
where P(x) is a poisson deviate with mean x, in and out are the
input and final pixel values, and background and gain are the
parameter values of the same name.
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| tsaab |
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11/09/2013 02:41AM
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Status: offline
Registered: 03/02/2011
Posts: 8
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Ah, thanks reading that again makes sense now.
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