1. School of Computer Science, Communication University of ChinaBeijing100024People's Republic of China
2. College of Criminal Investigation and Counter Terrorism, People's Public Security University of ChinaBeijing100038People's Republic of China
3. Beijing Key Laboratory of Signal and Information Processing for High‐End Printing EquipmentsBeijing Institute of Graphic CommunicationBeijing100026People's Republic of China
4. Faculty of Science and TechnologyCommunication University of ChinaBeijing100024People's Republic of China