File:Photon-noise.jpg

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Summary

Description
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
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This file was moved from Japanese Wikipedia.

See below for original file information.

File name

Photon-noise.jpg

Description

[[ショット雑音|光子雑音]]の[[シミュレーション]]。適当なソース画像を元にして、それぞれの[[ピクセル]]要素を[[ポアソン過程]]に従って決定することで、光子雑音だけを含む理想的な[[デジタルカメラ|カメラ]](量子効率は1で、[[読み出しノイズ]]･[[熱雑音]]などは存在しない)を再現した。 画像全体にわたって平均したピクセルあたり[[光子]]数は、上段左から右に0.001, 0.01, 0.1、 中段1.0, 10.0, 100.0、 下段1000.0, 10000.0 100000.0である。光子数10/ピクセルを越えたところで画質が急速に向上しているのが分かる。なお、ソース画像の撮影に使用したカメラは、ピクセルあたりの飽和容量が40,000電子量のものである。 画像をクリックして、縮小前の画像を見てみるといい。低光量の画像はピクセルが点在しているだけなので、[[ブラウザ]]によってはダウンサンプルされて黒一色に見えるだろう([[ウィキペディア]]の[[サーバー]]の問題かもしれない)。 今日市場に出回っている大半のデジタルカメラでは、光子雑音が最も大きなノイズ源となっている。高性能のカメラならば光量が低くても撮影できる(特殊な高額機種では個々の光子を検出することもできる)が、結局のところ光子のショット雑音によって画質が決まってしまう。 {{GFDL}}

File history
Date/Time (UTC) Dimensions User Comment
12 October 2007, 17:42:21 2304x1536 Deer hunter [[:en:Image:Photon-noise.jpg]] 13:26, 8 May 2007版からの転載。 {{GFDL}}
Page history
Date/Time (UTC) Flag User Edit summary: 
12 October 2007, 17:42:21 Deer hunter [[:en:Image:Photon-noise.jpg]] 13:26, 8 May 2007版からの転載。 {{GFDL}}
12 October 2007, 17:52:35 Deer hunter [[:en:Image:Photon-noise.jpg]] 13:26, 8 May 2007版における画像説明の翻訳。

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inception

12 June 2010

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current16:57, 12 June 2010Thumbnail for version as of 16:57, 12 June 20102,304 × 1,536 (1.26 MB)wikimediacommons>Eric Bajart{{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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