BTW, congrats for the first mention of YCbCr in this thread. For anyone
who doesn't know, Cb = blue chroma, Cr = red chroma, and those are
synonymous with U and V, and also with B-Y and R-Y. Some people insist on
distinguishing YCbCr, YUV and Y(B-Y)(R-Y) to mean slightly different
things and may also use apostrophes and stuff, but in the current
situation, one can't really expect a consistent notation from person to
person.

YCbCr is the terminology in CCIR 601 and ITU-R 709 and other digital standards. YUV and YIQ are part of the original PAL and NTSC analog systems which is where confusion can come in - particularly with 601 since it converts from YUV/YIQ analog into YCbCr.

http://www.poynton.com/papers/YUV_and_luminance_harmful.html