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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 YDbDr ： ウィキペディア英語版 YDbDr YDbDr, sometimes written YDBDR, is the colour space used in the SÉCAM analog terrestrial colour television broadcasting standard, which is used in France and some countries of the former Eastern Bloc. It is very close to YUV (PAL) and its related colour spaces such as YIQ (NTSC), YPbPr and YCbCr. YDbDr is composed of three components - $Y$, $D\_B$ and $D\_R$. $Y$ is the luminance, $D\_B$ and $D\_R$ are the chrominance components, representing the red and blue colour differences. == Formulas == The three component signals are created from an original RGB (red, green and blue) source. The weighted values of $R$, $G$ and $B$ are added together to produce a single $Y$ signal, representing the overall brightness, or luminance, of that spot. The $D\_B$ signal is then created by subtracting the $Y$ from the blue signal of the original RGB, and then scaling; and $D\_R$ by subtracting the $Y$ from the red, and then scaling by a different factor. These formulae approximate the conversion between the RGB colour space and YDbDr. :$\backslash begin$ R, G, B, Y &\in \left(0, 1 \right )\\ D_B, D_R &\in \left(-1.333, 1.333 \right )\end From RGB to YDbDr: :$\backslash begin$ Y &= +0.299 R +0.587 G +0.114 B\\ D_B &= -0.450 R -0.883 G +1.333 B\\ D_R &= -1.333 R +1.116 G +0.217B\\ \begin Y \\ D_B \\ D_R \end &= \begin 0.299 & 0.587 & 0.114 \\ -0.450 & -0.883 & 1.333 \\ -1.333 & 1.116 & 0.217 \end \begin R \\ G \\ B \end\end From YDbDr to RGB: :$\backslash begin$ R &= Y +0.000092303716148 D_B -0.525912630661865 D_R\\ G &= Y -0.129132898890509 D_B +0.267899328207599 D_R\\ B &= Y +0.664679059978955 D_B -0.000079202543533 D_R\\ \begin R \\ G \\ B \end &= \begin 1 & 0.000092303716148 & -0.525912630661865 \\ 1 & -0.129132898890509 & 0.267899328207599 \\ 1 & 0.664679059978955 & -0.000079202543533 \end \begin Y \\ D_B \\ D_R \end\end You may note that the $Y$ component of YDbDr is the same as the $Y$ component of YUV. $D\_B$ and $D\_R$ are related to the $U$ and $V$ components of the YUV colour space as follows: :$\backslash begin$ D_B &= + 3.059 U\\ D_R &= - 2.169 V\end There is also a variety of the PAL broadcasting standard, PAL-N, that uses the YDbDr colour space. 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「YDbDr」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.