YUV / RGB

YUV and Y'UV were used for analog encoding of color information(TV).
YCbCr was used for digital encoding of color information(images or videos).

In computers, we actually need RGB -> YCrCb

Y = (0.257 * R) + (0.504 * G) + (0.098 * B) + 16

Cr = V = (0.439 * R) - (0.368 * G) - (0.071 * B) + 128

Cb = U = -(0.148 * R) - (0.291 * G) + (0.439 * B) + 128


You can find more information from the following references.
Wikipedia: YUV
fourcc.org - RGB/YUV Pixel Conversion
xuyingpin - YUV轉換RGB算法
轉：YUY2/RGB轉換公式