With the analysis among 351 patents, we discovered top 210 key players by total patent application. Sony Group Corp., Sony Electronics, Inc., Apple, Inc. are dominant in this area. They take 11.11% of the total patent filing.  
Tokyo-to, Japan
Patent: 15
California, United States
Patent: 15
California, United States
Patent: 9
Microsoft Technology Licensing LLC
Washington, United States
Patent: 9
International Business Machines Corp.
New York, United States
Patent: 7
California, United States
Patent: 7
Baden-Württemberg, Germany
Patent: 7
State Grid Corp. of China
Beijing Shi, China
Patent: 7
Samsung Electronics Co., Ltd.
With the analysis among 6 patents, we discovered top 5 start-ups by total patent application. Matrixtime Robotics (Shanghai) Co., Ltd., Beijing Baidu Netcom Science & Technology Co., Ltd., Twiggle Ltd. are active in this area.  
Matrixtime Robotics (Shanghai) Co., Ltd.
Shanghai Shi, China
Patent: 2
Beijing Baidu Netcom Science & Technology Co., Ltd.
Beijing Shi, China
Patent: 1
Changsha Xingshen Intelligent Technology Co., Ltd.
Hunan Sheng, China
Patent: 1
California, United States
Patent: 1
With the analysis among related 298 patents applied in the last 5 years. We discover 213 most active companies in this area. The fast-growing Beijing Institute of Technology, Xidian University, State Grid Corp. of China take 7.72% of patent filing during this period.  
Beijing Institute of Technology
Beijing Shi, China
Patent: 8
Shaanxi Sheng, China
Patent: 8
State Grid Corp. of China
Beijing Shi, China
Patent: 7
Baden-Württemberg, Germany
Patent: 7
Hefei University of Technology
Anhui Sheng, China
Patent: 6
Zhejiang Sheng, China
Patent: 6
Jiangsu Sheng, China
Patent: 5
Guangdong University of Technology
Guangdong Sheng, China
Patent: 5
Jiangsu Sheng, China
Patent: 5
Fujian Sheng, China
Patent: 4
With the analysis among related 298 patents in last 5 years, we discover 180 new entrants. State Grid Corp. of China, Robert Bosch GmbH, Hefei University of Technology are the most active new entrants in this area.  
State Grid Corp. of China
Beijing Shi, China
Patent: 7
Baden-Württemberg, Germany
Patent: 7
Hefei University of Technology
Anhui Sheng, China
Patent: 6
Jiangsu Sheng, China
Patent: 5
China University of Mining & Technology
Jiangsu Sheng, China
Patent: 4
California, United States
Patent: 4
Nanjing University of Posts & Telecommunications
Jiangsu Sheng, China
Patent: 3
Shanghai Shi, China
Patent: 3
Tianjin Shi, China
Patent: 3
China Three Gorges University
Hubei Sheng, China
Patent: 3
With the analysis among 280 patents, we discovered top 103 universities and scientific research institutions by total patent application. Xidian University, Beijing Institute of Technology, Zhejiang University are dominant in this area. They take 11.07% of the total patent filing.  
Shaanxi Sheng, China
Patent: 12
Beijing Institute of Technology
Beijing Shi, China
Patent: 11
Zhejiang Sheng, China
Patent: 8
Beijing Shi, China
Patent: 8
University of Electronic Science & Technology of China
Sichuan Sheng, China
Patent: 8
Chongqing University of Posts and Telecommunications
Chongqing Shi, China
Patent: 7
Hefei University of Technology
Anhui Sheng, China
Patent: 6
Guangdong University of Technology
Guangdong Sheng, China
Patent: 6
Jiangsu Sheng, China
Patent: 6
Guangdong Sheng, China
Patent: 5