YUV 色彩空间的多种转换矩阵

Y = Kry· R + Kgy· G + Kby· B(R,G,B代表RGB色彩空间的红色,绿色,蓝色)

Cb= B – Y (Cb是差值)

Cr= R – Y(Cr是差值)

Kry+ Kgy+ Kby= 1(K 是比值或称权重, BT.601, BT.709,BT.2020中的权重是不同的。)

来自 <https://www.cnblogs.com/huxiaopeng/p/5653257.html>

1.模拟YUV->模拟RGB

1) BT601(标清国际定义)

12345678//*********************BT601***********************************////    Y = 0.299 * R + 0.587 * G + 0.114 *   B          ////   Pb =-0.169 * R – 0.331 * G + 0.500 *   B                    ////   Pr = 0.500 * R – 0.439 * G – 0.081 *   B                    ////    R = Y + 1.402*   Pr                      ////    G = Y – 0.344 * Pb  – 0.792* Pr                 ////    B = Y + 1.772 *   Pb                      ////*********************BT601***********************************//

2)BT709(高清)

12345678//*********************BT601***********************************////    Y = 0.213 * R + 0.715 * G + 0.072 *   B           ////   Pb =-0.115 * R – 0.385 * G + 0.500 *   B                    ////   Pr = 0.500 * R – 0.454 * G – 0.046 *   B                    ////    R = Y + 1.402*   Cr                      ////    G = Y – 0.344 * Cb  – 0.792* Cr                 ////    B = Y + 1.772 *   Cb                      ////*********************BT601***********************************//

2 数字YUV->数字RGB

1)BT601

12345678//*********************BT601***********************************////    Y = 16  + 0.257 * R + 0.504 * g + 0.098 *   b                  ////   Cb = 128 – 0.148 * R – 0.291 * g + 0.439 *   b                  ////   Cr = 128 + 0.439 * R – 0.368 * g – 0.071 *   b                  ////    R = 1.164 *(Y – 16) + 1.596 *(Cr –   128)                      ////    G = 1.164 *(Y – 16) – 0.392 *(Cb – 128) – 0.812 *(Cr – 128)////    B = 1.164 *(Y – 16) + 2.016 *(Cb –   128)                      ////*********************BT601***********************************//

2)BT709

12345678//*********************BT709***********************************////    Y = 16  + 0.183 * R + 0.614 * g + 0.062 *   b                  ////   Cb = 128 – 0.101 * R – 0.339 * g + 0.439 *   b                  ////   Cr = 128 + 0.439 * R – 0.399 * g – 0.040 *   b                  ////    R = 1.164 *(Y – 16) + 1.792 *(Cr –   128)                      ////    G = 1.164 *(Y – 16) – 0.213 *(Cb – 128) – 0.534 *(Cr – 128)////    B = 1.164 *(Y – 16) + 2.114 *(Cb –   128)                      ////*********************BT709***********************************//

来自 <https://www.cnblogs.com/zhengjianhong/p/7872459.html>

模拟RGB转YUV的推导公式 : 

1234Wr +   Wg + Wb = 1; UMax = 0.5; VMax = 0.5Y    = Wr * R + Wg * G + Wb * B;Pb =   Umax * (B – Y) / (1 – Wb);Pr =   Vmax * (R – Y) / (1 – Wr);

数字RGB转YUV的推导公式:

1234Wr +   Wg + Wb = 1; Umax = Vmax = 0.5;Y =   16 + 219 * (Wr * R  + Wg * G + Wb * B)   / 255;Cb =   128 + 224 * (Umax * (B – Y) / (1 – Wb)) / 255;Cr =   128 + 224 * (Vmax * (R – Y) / (1 – Wr)) / 255;

BT601 Wr = 0.299 Wg = 0.587 Wb = 0.114

BT709 Wr  = 0.2126 Wg = 0.7152 Wb = 0.0722

BT2020 Wr = 0.2627 Wg = 0.678 Wb = 0.0593

来自 <https://www.cnblogs.com/zhengjianhong/p/7872459.html>

BT.601

BT.709

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