File:Photon-noise.jpg
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Summary
[edit]DescriptionPhoton-noise.jpg |
English: A photon noise simulation, using a sample image as a source and a per-pixel Poisson process to model an otherwise perfect camera (quantum efficiency = 1, no read-noise, no thermal noise, etc).
Going from left to right, the mean number of photons per pixel over the whole image is (top row) 0.001, 0.01, 0.1 (middle row) 1.0, 10.0, 100.0 (bottom row) 1,000.0, 10,000.0 and 100,000.0. Note the rapid increase in quality past 10 photons/pixel. (The source image was collected with a camera with a per-pixel well capacity of about 40,000 photons.) Please click on the image to see the larger form; the low-level images are mainly isolated pixels, and your browser (or wikipedia's server) may be downsampling them to black. Photon noise is the dominant source of noise in the images that are collected by most digital cameras on the market today. Better cameras can go to lower levels of light -- specialized, expensive, cameras can detect individual photons -- but ultimately photon shot noise determines the quality of the image.Français : Simulation d'un bruit d'émission de photons, partant d'une photo et utilisant un processus de Poisson pour modéliser les pixels d'un appareil photo parfait. De gauche à droite le nombre moyen de photons par pixel sur l'ensemble de l'image vaut sur la ligne du haut : 0,001, 0,01 et 0,1 ; sur la ligne du milieu : 1,0, 10,0 et 100 ; sur la ligne du bas : 1 000, 10 000 et 100 000. À partir de 10 photons par pixel la qualité augmente rapidement. L'image d'origine a été prise avec un appareil d'un capacité de 40 000 photons par pixel. |
Date | |
Source | Photon-noise.jpg |
Author | Mdf |
Permission (Reusing this file) |
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:57, 12 June 2010 | 2,304 × 1,536 (1.26 MB) | Eric Bajart (talk | contribs) | {{Information |Description=A photon noise simulation, using a sample image as a source and a per-pixel Poisson process to model an otherwise perfect camera (quantum efficiency = 1, no read-noise, no thermal noise, etc). Going from left to right, the mean |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop Elements 2.0 |
File change date and time | 14:04, 31 January 2006 |
Color space | Uncalibrated |