function?tiqu_skin
%for?jj=1:1225
%I=imread（strcat（‘訓練集4\‘‘1?（‘num2str（jj）‘）‘‘.jpg‘））;
I=imread（‘img19.jpg‘）;
I=double（I）;
[huesv]=rgb2hsv（I）;

cb?=??0.148*?I（::1）?-?0.291*?I（::2）?+?0.439?*?I（::3）?+?128;
cr?=??0.439?*?I（::1）?-?0.368?*?I（::2）?-0.071?*?I（::3）?+?128;
[w?h]=size（I（::1））;

for?i=1:w
????for?j=1:h????????????
????????if??140<=cr（ij）?&?cr（ij）<=165?&