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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Signal-to-noise ratio (imaging) ： ウィキペディア英語版 Signal-to-noise ratio (imaging) The signal-to-noise ratio (SNR) is used in imaging as a physical measure of the sensitivity of a (digital or film) imaging system. Industry standards measure SNR in decibels (dB) of power and therefore apply the 10 log rule to the "pure" SNR ''ratio'' (a ratio of 1:1 yields 0 decibels, for instance). In turn, yielding the "sensitivity." Industry standards measure and define sensitivity in terms of the ISO film speed equivalent; SNR:32.04 dB = excellent image quality and SNR:20 dB = acceptable image quality.〔ISO 12232: 1997 Photography – Electronic Still Picture Cameras – Determining ISO Speed here〕 ==Definition of SNR== Traditionally, SNR has been defined as the ratio of the average signal value $\backslash mu\_\backslash mathrm$ to the standard deviation $\backslash sigma\_\backslash mathrm$ of the background: :$\backslash mathrm\; =\; \backslash frac\}$ However, when presented with a high-contrast scene, many imaging systems clamp the background to uniform black, forcing $\backslash sigma\_\backslash mathrm$ to zero, artificially making the SNR infinite.〔 〕 In this case a better definition of SNR is the ratio of the average signal value $\backslash mu\_\backslash mathrm$ to the standard deviation of the ''signal'' $\backslash sigma\_\backslash mathrm$: :$\backslash mathrm\; =\; \backslash frac\}$ which gives a meaningful result in the presence of clamping. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Signal-to-noise ratio (imaging)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.