Foreword
As one of the important state machines, prisons are the places where prisoners are detained, detained and rehabilitated. Because of the importance and particularity of prisons, prison security work is related to social stability and national security. Once negligence can cause irreparable Social impact and harm. For example, the prisoner in the Second Prison of Inner Mongolia killed prison guards and escaped from prison. This caused great damage and loss to prisons, prison guards, and society. Especially in the “construction of a harmonious society†environment, a prison security system was constructed. It is particularly important. Therefore, in the public security and judicial departments, the “policing of science and technology to police force†has become a trend in the management of prisons.
The status and disadvantages of prison video surveillance
Video surveillance is the basis of the entire prison security system. It not only ensures that all activities of detainees are within the line of sight of the on-duty police officers, but also ensures that video files are available for verification after the accident. Therefore, the prison video surveillance system is an important tool for improving the level of security and technical protection of prisons. It plays an irreplaceable role in supervising the reform of prisoners and preventing emergencies in prisons.
However, the above monitoring system still has a lot of drawbacks. Currently, the closed-circuit monitoring system widely used in domestic prisons adopts matrix host control, monitors the front-end monitoring screen through the TV wall, and uses DVR equipment for video recording and playback. This type of traditional video surveillance mode can only be used for ex post facto forensics in most cases and cannot play a role in prevention and warning. Due to the fact that human beings are the monitor themselves, there are many limitations in the monitoring capabilities. These limiting factors make the video surveillance system more or less alarm accuracy, false positives and false negatives, long alarm response time, and video data. The analysis of difficulties and other defects will lead to a reduction in the overall system safety and practicality, and it will not be able to meet such places where the safety level of the prison system is very high. At the same time, with the increase of the number of images in the surveillance system, prison officers are relatively nervous, which also greatly reduces the efficiency of monitoring. In recent years, vicious violence has occurred in the prison system. Intelligent video surveillance can cover all the functions of the original video surveillance and add new intelligent analysis functions. In addition to meeting the needs of video surveillance, it can also provide effective early warning when an abnormal situation occurs, such as prisoner jailbreaks and illegal crowd gatherings. When fighting the abnormal situation of fighters and guards, they will be alerted before or during the incident to effectively prevent and stop the occurrence of violent incidents and reduce the occurrence of serious incidents. After major problems occur in prisons and detention centers, only video can be retrieved. See the drawbacks.
In the current prison security monitoring system, it is more dependent on the monitoring personnel to monitor and monitor the entire room. When an abnormal situation occurs, the monitoring personnel can only tell relevant leaders in the form of telephone or text messages, and apply 3G intelligence. The advantage of the video analysis and monitoring system lies in the fact that relying on the strong coverage of 3G wireless networks and without relying on fixed networks, it only requires the use of 3G mobile phones, so that it can watch videos, preview alarms, and on-site command at any time and anywhere, which greatly expands the monitoring. Time and geographical restrictions have shortened the response time of leaders and related personnel and minimized the damage.
Project Introduction
Take the intelligent video surveillance implemented by a city detention center in the Inner Mongolia Autonomous Region as an example. The detention center is one of the most important detention centers in the city. It has implemented ordinary video surveillance, and transmits video and video surveillance video to the surveillance room through a video optical transceiver. It takes about 6 minutes to monitor and complete the rotation of the entire 380 cameras. This is precisely the most likely problem. When a violent incident takes place during the training interval, it means such violence. The incident cannot be monitored effectively and it will cause great harm. Therefore, a three-dimensional prison surveillance system for video surveillance has been customized according to the needs of customers, which fully solves the monitoring problems encountered by customers, effectively reducing dead spots and drawbacks, and greatly improving prisons. Video surveillance efficiency.
Intelligent Video Analysis Implementation
The emergence of intelligent video surveillance technology is to solve some of the defects inherent in traditional video surveillance systems. With the advent of intelligent video surveillance technology, the transition from passive to active surveillance has been realized, enabling video to be continuously monitored around the clock, automatically detecting abnormalities in the surveillance screen, and thus helping security personnel to deal with the crisis more effectively. Minimize false positives and false negatives to meet the security requirements of prison security systems. The intelligent video surveillance system mainly covers the following major aspects in the prison system.
1. Prison fights and fights gathering intelligence identification system
In prison empty places, such as playgrounds, canteens, etc., or in places such as prisons, places for releasing winds, etc., when the prisoners appear to gather together, there are often suspicions of anomalies such as gathering crowds and fighting and fighting. In order to ensure the safety of detainees and the protection of the human rights of detainees, it is necessary to use intelligent identification systems for human abnormal behaviors such as fights, fights, and gatherings. This system is based on intelligent video analysis combined with human behavior detection. When the above-mentioned suspicions occur, an automatic alarm is issued to remind. The abnormal situation occurs in the supervision department, and it is timely reflected and handled to prevent the occurrence of violent incidents. When the above abnormality occurs, SMS, MMS, push video, etc. can be sent to the relevant authorized mobile phone, and can be connected to the site via a 3G mobile phone to perform work deployment on the spot through the mobile phone, and realizing anytime, anywhere command And coordination to minimize harm.
2. Prison wall intelligent patrol system
To effectively supervise and manage patrolling personnel and patrols, managers can define different rules according to the requirements of patrol sites and patrol routes to ensure that patrols conduct patrols and track patrols in real time. The trajectory records the time and mileage of patrolling personnel, identifies the patrol personnel’s patrol status, and automatically alerts when patrolling personnel are found to be down or abnormal, effectively protecting the personal safety of the patrolling personnel; and avoiding unattended patrols. The patrolling, patrolling time and the patrolling process were carried out according to the stipulated route; at the same time, it was also possible to effectively avoid confiscation of illegal behaviors such as stringing in and out of the high wall during patrols or for the detainees to circumscribe the patrols, and to ensure the normal and safe operation of the prisons and detention centers.
3. Ganggang Sentinel Abnormal Intelligent Identification System
a) Normal state: The sentinels are on duty in the sentry post, their posture is correct and they are active in the specified area. They are normal conditions and will not trigger an alarm;
b) Nonstandard posts: The sentinels perform duties in the sentinels. In the process, the sentinels have irregular postures such as leaning against the wall, bending over, sitting down, and falling down, and the system is identified as an abnormal post;
c) Falling to the ground: When the sentry is on duty in the sentinel, the sentry may have fallen to the ground due to heat stroke or long-range attack. The system is identified as an abnormal post;
d) Two people: The sentry was on duty in the guard post. During the process, two people appeared in the post and the stay time exceeded the time set by the system. The system was identified as a post abnormality alarm;
e) Multi-person alarm: The sentry was on duty in the post. During the process, there were multiple people (three or more) in the post and the system was identified as abnormal alarm of the post;
f) Off-duty alarm: The sentinel is on duty in the sentinel. During the process, the sentry leaves the post and the system recognizes the abnormal alarm as the post;
g) Attacks on Assault: The Sentinel conducts duty on the sentry. When someone attacks a sentinel or acts violently, the system automatically recognizes the alarm and effectively protects the sentinels;
h) Change of occupational alarm: When the sentry changes its position, it does not change its position according to the specified area or specified actions, and the time is changed. The system automatically recognizes the alarm.
4. Comprehensive Prison Break Prevention System
For the prison wall, it can be used in combination with multiple functions such as warning line crossing detection, detention detection, and guard zone intrusion detection to prevent prisoners from escaping from the wall. In the wall, when someone enters the alert zone, the smart device issues an alarm and the operator in the duty room immediately receives the alarm screen. When the person crosses the warning line again, it indicates that the person is likely to climb over the wall, and the smart device issues an alarm again. The duty officer immediately took related measures. With these two lines of defense, it is almost impossible for prisoners to climb over the wall. A warning zone will also be set up outside the fence. If a person stays in the warning zone for a long time, he or she can also generate an alarm, which indicates that the person on duty is very suspicious. When the smart device issues an early warning, a series of alarm linkages can be performed. The alarm monitoring platform automatically pops up an alarm screen. The main screen of the TV wall automatically pops up an alarm screen, and the alarm is automatically forwarded to a higher-level unit so that the superior unit can see the alarm screen at the first time. . Through the use of 3G mobile phones, it can be viewed throughout the prison detention center, focusing on key prisoners, ensuring that the whereabouts of detainees and prison guards in the entire facility can be seen anywhere and at any time, and that the dangers can be killed in the bud.
Intelligent video analysis problems in prison applications and how to deal with them
a) Extremely high accuracy and extremely low false alarm rate
The most important features of the application of intelligent video analysis (IVS) in prisons are strict requirements, complex environments, and strong dependence on the platform. The importance and speciality of prisons as national machines require that the accuracy of intelligent video analytics monitoring ensure the lowest false positive rate. Under the premise of being able to achieve the highest accuracy, this requires manufacturers to optimize the algorithm based on the site environment, and at the same time can be combined with physical media, such as infrared radiation, inductive coils, etc., integrated intelligent video analysis and monitoring to achieve Complementary advantages, to minimize the false alarm rate, the highest accuracy.
b) Integration with the original prison simulation monitoring system
Many prisons have already implemented video surveillance systems. How to integrate them with existing systems is the first factor to be considered. It is impossible to rearrange cameras and network cabling for intelligent video surveillance. This requires manufacturers to have strong capabilities. The advantages of the platform, the ability of the platform to perform intelligent video analysis on the premise that it can provide the original platform functions, but also taking into account how to use the platform driver matrix for large screen and alarm image linkage, the original DVR image retrieval and retrieval, How to achieve multi-person and multi-point concurrent warnings to access the same image and provide the overall platform effectiveness of the streaming media server, etc. These are highlights of whether the manufacturer has a platform, whether it is active code level development and so on.
Conclusion
The high confidentiality of the prison involves important information from the country, as Zhuo Zhuchang, who is responsible for prison video surveillance at a prison in Hohhot, Inner Mongolia Autonomous Region, said: “Foreign brand smart video surveillance products and domestic use of algorithm chips provided abroad provide equipment. It will be very difficult for manufacturers to enter the prison system. The core algorithms are all foreign. How do we know if your equipment will leak information inside the prison?â€, so the intelligent video surveillance system of the prison system also needs domestic manufacturers’ technical strength. Work hard to make the core algorithm optimal, at least not worse than foreign countries, so that domestic manufacturers in the localization of services, customization, technical support training and other aspects of the advantages can be highlighted, to better meet customer needs. (Bai Xuefeng, General Manager, Inner Mongolia Branch, China Telecom Group System Integration Co., Ltd.)