To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
.
Leo
Newton
Brights
Milds

Signal-to-noise ratio (imaging)

From Wikipedia, the free encyclopedia

Signal-to-noise ratio (SNR) is used in imaging to characterize image quality. The sensitivity of a (digital or film) imaging system is typically described in the terms of the signal level that yields a threshold level of SNR.

Industry standards define sensitivity in terms of the ISO film speed equivalent, using SNR thresholds (at average scene luminance) of 40:1 for "excellent" image quality and 10:1 for "acceptable" image quality.[1]

SNR is sometimes quantified in decibels (dB) of signal power relative to noise power, though in the imaging field the concept of "power" is sometimes taken to be the power of a voltage signal proportional to optical power; so a 20 dB SNR may mean either 10:1 or 100:1 optical power, depending on which definition is in use.

Definition of SNR

Traditionally, SNR is defined to be the ratio of the average signal value to the standard deviation of the signal :[2][3]

when the signal is an optical intensity, or as the square of this value if the signal and noise are viewed as amplitudes (field quantities).

See also

References

  1. ^ ISO 12232: 1997 Photography – Electronic Still Picture Cameras – Determining ISO Speed
  2. ^ Janesick, James R. (2007). Photon Transfer. doi:10.1117/3.725073. ISBN 978-0-8194-7838-2.
  3. ^ Rowlands, Andy (April 2017). Physics of Digital Photography. IOP Publishing. ISBN 978-0-7503-1243-1.

Further reading


This page was last edited on 15 January 2021, at 07:49
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.