Anti Surveillance Cameras-you need to understand it first
surveillance cameras needs
Even if a country’s law enforcement agencies have sufficient budget, law enforcement officers can not use the human eye to follow the surveillance cameras to capture the movement of people in need of attention. As law enforcement agencies require more efficient security management and improved surveillance conditions, the number of surveillance cameras is growing faster and covering a wider area.
The shortcomings of traditional surveillance cameras
Traditional surveillance cameras only provide simple functions such as video capture, storage and playback, used to record what happened, it is difficult to play the role of early warning and alarm. To ensure real-time monitoring of abnormal behavior and timely and effective measures, law enforcement officers need to monitor the video moment by moment, In this case, law enforcement officers are easily tired, especially in the face of multiple surveillance video, often overwhelmed, it is difficult to respond to abnormalities in a timely manner. Therefore, there is an urgent need for intelligent surveillance cameras to assist law enforcement officers in their work. Many cameras, a huge surveillance network, instantly generates a huge amount of video data, how to efficiently extract useful information from these massive data, it becomes intelligent video surveillance technology to solve the problem.
Surveillance cameras development history
(1) the first generation: analog video surveillance system With the development of optical imaging technology and electronic technology, the manufacture and use of surveillance cameras become possible, in order to meet the use of electronic devices instead of people or other creatures to monitor the demand, about the 1970s, the world ushered in the electronic surveillance system, this period to closed circuit television monitoring system (ClosedCircuitTele vision, CCTV) is the main, that is, the first surveillance system. Generally use a coaxial cable to transmit the front-end analog camera video signal, the analog monitor for display, and storage by the tape recorder to complete. This generation of technology is relatively inexpensive, relatively simple to install, suitable for small-scale security systems.
(2) the second generation: digital video surveillance system As the tape recorder storage capacity is too small, cable-type transmission limits the scope of monitoring and other shortcomings, with the progress of digital coding technology and chip technology, the mid-1990s, digital video surveillance system was born. The initial use of analog cameras and embedded hard disk recorder (DigitalVideoRecorder, DVR), this stage is known as the semi-digital era, the late development into the use of network cameras and video servers (DigitalVideoServer, DVS), becoming a true digital video surveillance system. DVR a large number of applications make the surveillance system accommodate more cameras, store more video data, thus making the number of cameras increase. Embedded and the development of network communication technology makes the image encoding and processing unit from the background to the front end, video images encoded in the camera side after the network to the background, digital video surveillance system has a wide range of applications, good scalability, easy to use and maintain, for more than 100, 1000, or even city-level scale security system, but the expansion of the scale of monitoring at the same time brought about the video Content understanding of the demand, it can be said that the development of digital technology.
(3) the third generation: intelligent video surveillance system with the second generation of digital video surveillance technology advances, large-scale deployment and control has become possible. At the same time, with the increasingly severe security situation around the world, the worldwide demand for video surveillance systems has never been higher, countries are deploying more and more intensive cameras. 2006, the United Kingdom has 4.5 million CCTV-controlled cameras, each British people will be photographed 300 times a day on average; 2008, the United States has installed more than 20 million cameras; 2010, China More than 10 million surveillance cameras are used for urban monitoring and alarm systems ．The increase in cameras brings the possibility of large-scale prevention, i.e., access to massive amounts of video data for real-time alerts and post-event inquiries. However, for the people who are the main users, large scale video data also poses a huge challenge. The U.S. National Laboratory in Santiago did a study, the results show that after only 22 minutes of staring at the video screen, the human eye will be blind to more than 95% of the video screen activity information. Based on the above needs, intelligent video surveillance system is born, the core part of which is based on computer vision video content understanding technology, through the original video image through background modeling, target detection and recognition, target tracking and a series of algorithm analysis, and then analyze the target behavior and events, so as to answer the “who, where, what” questions people are interested in, and then according to the “who, where, what” questions. Then, according to the pre-set security rules, the alarm signal will be issued in time. The biggest advantage of intelligent video surveillance system is different from traditional video surveillance system is that it can automatically analyze the alarm in real time around the clock, completely changing the previous mode of monitoring and analyzing the surveillance screen by security personnel; at the same time, the intelligent technology turns the general monitoring system into after-the-fact analysis and early warning, not only to identify suspicious activities, but also to prompt security personnel to pay attention to the relevant surveillance screen and prepare in advance before the security threat occurs. This will improve the response speed and reduce the human burden, thus achieving the purpose of using computers to assist the human brain. This technology has also been recognized by academia and industry, with the Institute of Electrical and Electronics Engineers (IEEE) highlighting seven technologies that are considered likely to change the world at its 125th anniversary conference, including the core image and video content analysis technology for intelligent video surveillance. IPVM, a leading international video surveillance market website, conducted a poll in 2012 for senior members to select the most influential technologies for the future of the surveillance industry, and the highest vote was for video analytics in the context of intelligence, followed by massive video data storage brought about by a large number of high-definition surveillance cameras.
Intelligent surveillance cameras advantages
Intelligent video surveillance technology is to make the computer like a human brain, so that the camera like a human eye, by the computer to intelligently analyze the image sequences obtained from the camera, to understand the content of the scene being monitored, to achieve automatic warning and alarm of abnormal behavior. Since the end of the 20th century, with the development of computer vision, intelligent video surveillance technology has received extensive attention and research, and with the increasing importance of security, has also become a current research hotspot . Intelligent video surveillance includes detection, classification, tracking and identification of the target of interest in dynamic scenes on the underlying layer, and identification, analysis and understanding of the behavior of the target of interest. Intelligent video surveillance technology can be widely used in various monitoring scenarios such as public safety monitoring, street monitoring, residential area monitoring, traffic status monitoring, etc., to achieve crime prevention, traffic control, accident prevention and detection functions, which can significantly improve monitoring efficiency and reduce monitoring costs, and has a wide range of research significance and application prospects.
Smart surveillance technology is neutral, and it is the unethical use of smart surveillance technology that we oppose.
Post time: Sep-30-2021