code: public static void scaleIntrinsic(CameraPinhole param , double scale ) {
  		param.width = (int)(param.width*scale);
  		param.height = (int)(param.height*scale);
  		param.cx *= scale;
  		param.cy *= scale;
  		param.fx *= scale;
  		param.fy *= scale;
  		param.skew *= scale;
  	}
docs: Multiplies each element of the intrinsic parameters by the provided scale factor.  Useful
  if the image has been rescaled.
  
  @param param Intrinsic parameters
  @param scale Scale factor that input image is being scaled by.