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Intelligent vision era-3D structured light, iris recognition technology application in security industry

Author: huifan   Time: 2020-01-07

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[Abstract]
This article will be based on face recognition technology, focusing on 3D structured light and iris recognition technology, and briefly analyze the main applications of the above technologies in the security industry.
 
In the Security Industry Association's (SIA) 's 2020 Top Ten Trends List, artificial intelligence is still a buzzword in the security industry, and its ranking jumped from fifth to last year to second, followed by it in recent years Come face recognition technology that shines in the security industry. SIA also predicts that trends in artificial intelligence and facial recognition will greatly affect the entire industry in the coming years. It can be seen that artificial intelligence technologies, including facial recognition technology, will still become the main theme of the security industry in the next few years.
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This article will be based on face recognition technology, and will focus on 3D structured light and iris recognition technology, as well as analyze the main applications of the above technologies in the security industry.
 
Application advantages of 3D structured light and iris recognition technology
 
3D structured light is a type of 3D face recognition technology, which is similar to 2D face recognition. Image data acquisition-> face detection-> feature extraction-> information comparison is also the main step of 3D structured light, but 3D There is a big difference between structured light and 2D face recognition in the way of image data acquisition and face feature extraction.
 
2D face recognition is image detection based on two-dimensional data, and image data acquisition can be completed through ordinary cameras; while 3D structured light image data acquisition needs to be completed through ordinary cameras + depth cameras (general cameras generate 3D after obtaining RGB information) In other words, 2D face recognition is camera plane imaging, while 3D structured light is three-dimensional imaging. Millions of projected rays are ejected from the camera onto the recognition object to form a three-dimensional stereo image, which can more accurately identify the object.
 
From the description above, we can see that from the point of view of image data acquisition, due to the different depths of cameras, the 3D structured light has strong anti-interference performance, and is basically not affected by light conditions. At the same time, it is affected by shooting angles and occlusions. The influence of factors is also small, so that the recognition accuracy of 3D structured light is much higher than that of 2D face recognition, and the anti-counterfeiting ability is also much stronger.
 
Take a look at iris recognition. The process of iris recognition is image acquisition-> image preprocessing-> iris segmentation-> special chip-> feature storage and feature matching. Although iris recognition is not as extensive as face recognition technology, it needs to be emphasized Yes, iris recognition is receiving widespread attention from the country and is constantly evolving.
 
Thanks to the uniqueness of the iris in the eye, the iris recognition technology has four major advantages: uniqueness (up to 266 recognition pillows, the probability of two people having the same iris structure is 1: 10 ^ -72), and the most stable ( Eight months of texture formation), the safest (the error acceptance rate is very low (10 ^ -7), the most convenient (the user does not need to touch the recognizer, the recognition can be completed in one second).)
 
The main application of 3D structured light and iris recognition technology in the security industry
 
The industry has a view that the emergence of 3D face recognition technology has brought the fourth visual revolution to the visual perception technology (the first three times are black and white to color, analog to digital, and clear to high definition). 3D perceptual intelligence is not only the visual entrance of cognitive intelligence, but also promotes the arrival of the era of intelligent visual perception.
 
With the gradual maturity of technology, 3D face locks / access control, gates, authentication comparison management systems, 3D face boxes, 3D network cameras, 3D portrait multi-dimensional data control channels, 3D portrait structured intelligent analysis application servers, etc. Products and solutions have gradually been enriched and become the main product form of 3D structured light. And thanks to its strong anti-counterfeiting capabilities, 3D structured light is also showing its strength in intelligent security.
 
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Certain industries with very high confidentiality requirements, such as payment and home door locks, are the main application scenarios of 3D structured light today. In financial-grade scenes, 3D structured light can guarantee financial-grade security, quickly verify personnel information, assign access to personnel, ensure property and information security; in the field of intelligent transportation, 3D face recognition technology including 3D structured light It has become a key technology for "brushing and riding a car", such as Jinan Metro Line 1 using 3D face recognition technology to achieve face brushing and riding a subway; along with 3D face point cloud data, 3D bone tracking recognition, 3D Vslam positioning and navigation, etc. The development of technology, including 3D face recognition technology including 3D structured light, has gradually landed in robot vision recognition, smart logistics, smart retail, smart education and other fields, as well as government, talented apartments, campuses, billions of yuan and other important places In order to improve the intellectual capacity of the industry and ensure public safety in cities.
 
Unlike the emergence of the "brush face era", which is dominated by face recognition technology, the application of iris technology in the security industry is mainly based on identity authentication systems, which are concentrated in public security areas such as anti-terrorism, criminal investigation, and immigration management.
 
According to traceable data, the application of iris recognition technology in the security industry can be traced back to 2002. The United Kingdom and the UAE applied iris recognition technology to airport security systems, immigration management, and criminal investigation and law enforcement. Among British airports, Performed iris recognition 10 ^ 10 times; in 2009, India applied iris recognition technology to citizen identity verification, and the frequency of use can reach 10 ^ 14 times a day; in 2013 and 2014, Afghanistan and the United States successively incorporated iris information into the national identity verification system. As the next-generation identity authentication, in favor of this authentication system, Afghanistan and the United Nations Refugee Agency have released relief funds to combat terrorists; in 2016, China's Xinjiang region collected iris information to build a database for public safety and counter-terrorism fields; in 2017, Singapore collected Iris of nationals and permanent residents is planned to be fully opened for entry and exit by 2022; and just in 2019, the Ministry of Public Security of China issued a national criminal investigation iris collection policy document, and the US Restaurant International Airport deployed an iris authentication identification system to transit passengers. Screening, UK in Gat The iris recognition system is built at wick airport to distinguish British citizens from international visitors ... All of the above are the main applications of iris recognition in the public safety field in various countries around the world.
 
Looking only at China, looking to the future, iris recognition is expected to become the core "meritor" in China's public security field. Especially, the Ministry of Public Security of China has issued enough national criminal investigation iris collection policy documents. The large-scale application of China's iris recognition has officially opened. Iris recognition technology And related solutions have been widely used in areas such as immigration management, counter-terrorism, and regulatory agencies, and there have been various airports, highway checkpoints, high-speed rail stations, railway stations and other places of entry and exit throughout the country. The iris identity information database is established to realize the identity verification of personnel without a certificate, so as to enhance the public security organs' ability to control public security.
 
Analysis of Difficulties in Application of 3D Structured Light and Iris Recognition Technology
 
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But everything has cracks. In China, 3D structured light and iris recognition technology still need to solve many problems in order to be widely used.
 
First of all, let's take a look at 3D structured light. In the author's interview, there are three "big mountains" in the development of 3D structured light: one is that the recognition distance is short and it is difficult to meet the needs of current long-distance scenes; the other is that it will be affected by natural light and cause imaging The number of pixels is not enough, and the recognition accuracy is reduced, which makes the recognition efficiency of 3D face recognition in some scenes low. Third is the cost problem. The entire system of 3D structured light includes structured light projection equipment, cameras, image acquisition and processing systems, required The cost is much higher than the cost of 2D face recognition. The camera equipment alone is not as simple as an ordinary camera. This is also the main reason why 3D structured light cannot be used on access control products on a large scale.
 
Let's talk about iris recognition. Because the technology of iris recognition is more difficult, it is susceptible to interference from the external environment, and the requirements for recognition distance are high. Compared with face recognition, iris image acquisition requires a process. Because iris recognition requires a more professional and special acquisition lens than face recognition, the hardware cost is relatively expensive. These factors have hindered its entry into the general consumer market to some extent, and its penetration rate needs to be increased. In addition, the current development of China's iris recognition technology is still limited by many factors, one is the acquisition technology and equipment, and the other is the national policy factor. At present, China's iris collection behavior is still in its infancy. To achieve the same wide application as face recognition, it needs the support of national policies.
 
Summary:
 
In the era of visual intelligence, face recognition has become the most popular and widely used technology for artificial intelligence in the security industry. This is beyond doubt. But the times are developing, and technology needs to continue to move forward. 3D structured light will become the mainstream technology of face recognition technology. Iris recognition is gradually replacing face recognition technology in some scenes, or it may be combined with face recognition technology to build more Inject new blood into the security industry for a secure identity authentication system.