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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 Hybrid Log-Gamma ： ウィキペディア英語版 Hybrid Log-Gamma Hybrid Log-Gamma (HLG) is a high dynamic range (HDR) standard that was jointly developed by the BBC and NHK. The HLG standard is royalty free and was approved as ARIB STD-B67 by the Association of Radio Industries and Businesses (ARIB).〔 HLG is compatible with standard dynamic range (SDR) displays.〔 ==Technical details== HLG defines a nonlinear transfer function in which the lower half of the signal values use a gamma curve and the upper half of the signal values use a logarithmic curve.〔 $E\text{'}=\backslash begin$ r\sqrt\ & 0 \le E \le 1,\!\\ a \times\ ln(E - b) + c & 1 < E \end *where E is the signal normalized by the reference white level and E' is the resulting nonlinear signal *where r is the reference white level and has a signal value of 0.5 *where a = 0.17883277, b = 0.28466892, and c = 0.55991073 The signal value is 0.5 for the reference white level while the signal value for 1 has a relative luminance that is 12 times higher than the reference white level.〔 HLG uses a logarithmic curve for the upper half of the signal values due to Weber's law.〔 HLG does not need to use metadata since it is compatible with both SDR displays and HDR displays.〔〔 HLG can be used with displays of different brightness in a wide range of viewing environments.〔 The dynamic range that can be perceived by the human eye in a single image is around 14 stops.〔 SDR video with a 2.4 gamma curve and a bit depth of 8-bits per sample has a dynamic range of about 6 stops.〔 Professional SDR video with a bit depth of 10-bits per sample has a dynamic range of about 10 stops.〔 When HLG is displayed on a 2,000 cd/m2 display with a bit depth of 10-bits per sample it has a dynamic range of 200,000:1 or 17.6 stops.〔 HLG increases the dynamic range of the video compared to a conventional gamma curve by using a logarithmic curve for the upper half of the signal values.〔 HLG also increases the dynamic range by not including the linear part of the conventional gamma curve used by Rec. 601 and Rec. 709. The linear part of the conventional gamma curve was used to limit camera noise in low light video but is no longer needed with HDR cameras.〔 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「Hybrid Log-Gamma」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.