still image/image sequencedatabase of facessegmentation of facesextraction of featuresidentificationidentification of one or more personsValue (V)Saturation (S)S=1CyanGreenYellowHue-AngleS=0V=1BlueMagentaRedV=0GreenYellowHmaxCyanHSminSmaxHminRedSBlueMagentayayθbxxhwatershed pixelhmaxhminxgreylevel reliefh=hminh+1h+2h+3h+4watershed pixelborder pixel2000020y-relief406080100120140x-relief eyes120’x_relief_eyes’10080604020090100110120130140150x-relief mouth100’x_relief_mouth’90807060504030201009010011012013014015002100108’feiler_y’CF1.0P1P2P3(a)P4eye distancehead widthCF1.0(b)P5difference