RGB到YUV转换的vc代码

void RGBToYUV(unsigned char r,unsigned char g,unsigned char b,float &y,float &u,float &v)
{
    y = 0.299*r + 0.587*g + 0.114*b;
    u = (-0.169)*r + (-0.331)*g + 0.5*b + 128;
    v = 0.5*r + (-0.419)*g + (-0.082)*b + 128;
}

    y=(unsigned char)((299*r+587*g+114*b)/1000);
    u=(unsigned char)(((-169)*r+(-331)*g+500*b+128000)/1000);
    v=(unsigned char)((500*r+(-419)*g+(-82)*b+128000)/1000);