代码：

/*输入：rgb图像输出：与输入图像尺寸相同的灰度图，若rgb图中某像素检测为肤色，则灰度图中对应像素为255，否则为0*/void SkinRGB( Mat &rgb,Mat &dst){    assert(rgb.channels() == 3 );    const int R = 2;    const int G = 1;    const int B = 0;        dst = Mat::zeros(rgb.rows, rgb.cols, CV_8U);    for (int i = 0; i < rgb.rows; i++){        Vec3b* ptr = rgb.ptr
     
      (i);        uchar* ptr_mask = dst.ptr
      
       (i);        for (int j = 0; j < rgb.cols; j++){            Vec3b pixel = ptr[j];            if ((pixel[R] > 95 && pixel[G]>40 && pixel[B] > 20 &&                pixel[R] - pixel[B]>15 && pixel[R] - pixel[G]>15) ||                 (pixel[R]>200 && pixel[G]>210 && pixel[B]>170 &&                abs(pixel[R] - pixel[B]) <= 15 && pixel[R]>pixel[B] && pixel[G]>pixel[B])){                ptr_mask[j] = 255;            }        }    }}
      
     

效果：