The orthogonal color spaces reduce the redundancy
present in RGB color channels and represent the color with
statistically independent components (as independent as
possible). As the luminance and chrominance components
are explicitly separated, these spaces are a favorable choice
for skin detection. The YCbCr space represents color as
luminance (Y) computed as a weighted sum of RGB values,
and chrominance (Cb and Cr) computed by subtracting the
luminance component from B and R values. The YCbCr
space is one of the most popular choices for skin detection