Demand for camera selection
Today, with the development of high-tech digitalization, digital, intelligent, high-definition and integration are the new requirements of the prison system for the video monitoring system. They are also the way to give full play to the role of the monitoring system and achieve the goal of “requiring police force from science and technology”. The video monitoring system closely monitors key areas such as the walls around the prison, prison buildings, and detention rooms around the prison 24 hours a day.
It can not only quickly respond to events such as prison break or intended escape, fighting, and riots at the first time, but also provide verification data within a certain period of time before and after the event; At the same time, the monitoring remote transmission technology is used to realize the monitoring of each prison by the provincial bureau monitoring center, providing more effective management means for prison management, greatly reducing the pressure of supervisors, and improving the efficiency and quality of management.
Analysis on the Distribution and Selection of Monitoring Points in Prison Districts
Generally speaking, prison monitoring points are mainly distributed in prison buildings and detention rooms; Workshop and corridor in the supervision area; Supervision area office and conversation room; Hospital wards and outpatient rooms; Gate of the prison area; The commanding heights of the prison area (the top of the prison office building, the top of the teaching building, and the top of the prison area gate); public place; Perimeter of prison wall, gate, ventilation area and other areas.
Of course, the core component of the video capture front-end is the camera. In these important monitoring areas of the prison, it is the focus of this paper to select the appropriate camera according to the environmental monitoring application needs of the monitoring area of the monitoring point to achieve the clear monitoring requirements of different environments.
1、Prison and confined room
In recent years, prisoners committed suicide and fought repeatedly in the prison system; Such as “hide and seek”, “sleep to death”, “wash your face to death” and other strange deaths of prisoners in custody; The “XX death” incident has caused a bad impact on the society! Widely questioned the management loopholes in prisons.
These events occurred in places that need to be closely monitored, such as prison buildings and confined rooms. Therefore, for some highly dangerous prisoners, their activities need to be monitored in real time and clearly without blind spots to prevent accidents, and the safety of themselves and others in the prison is the top priority of the monitoring system.
At the same time, the event process is restored through real-time monitoring and video evidence collection to achieve comprehensive prevention, safety and control. Based on the above requirements, the camera deployment in the prison and the confined room has the following three characteristics:
● Since prisoners are prone to violent destruction of equipment, the equipment should be anti riot and adapt to a wide range of voltage, and anti riot cameras (hemispherical or gun machine) should be used;
● Since most of the prison buildings and confined rooms are rectangular, in order to achieve no monitoring blind spots, one camera needs to be installed at the front and one camera needs to be installed at the back, and a wide-angle lens needs to be used. The installation position of the camera can be exposed to achieve the deterrent effect. The installation height is required to be the place that the prisoner cannot reach to prevent the equipment from being damaged;
● Since the prison building and the confined room area need to monitor the prisoner’s activities clearly 24 hours a day, it is necessary to use an infrared camera with a resolution of more than 540 lines to make the activities of the personnel in the whole prison building clear.
2、Monitoring area workshop and corridor
The workshop and corridor areas in the monitoring area are places where people frequently enter and gather, and where people gather or move around dispersedly are prone to lax management and security accidents. These areas are the key monitoring areas in the monitoring area and need to be monitored around the clock.
The light difference between day and night in these areas is large, and the light in the night channel is generally dim, so it is necessary to clearly identify the body and facial features of patrol personnel or other personnel to prevent management loopholes. The day and night infrared camera is used, with the definition of more than 540 lines.
It is necessary to have a wide dynamic function to improve the camera definition and restore realistic images of color; It can also provide clear images in the environment with complex light.
3、Supervision area office and conversation room
This area is the working and living area for supervisors. When there are few supervisors, we must effectively master the situation in the whole prison, so as to make timely response. The infrared dome camera should be installed on the ceiling to ensure the image quality in the case of insufficient light at night.
4、Hospital ward and outpatient room
This area is the key monitoring area of the prison area. In order to prevent accidents, it is necessary to clearly monitor the status of prisoners and ensure the safety of staff and managers. It is necessary to clearly monitor the activities of personnel in this area in real time. A megapixel (720P) webcam should be used.
5、Gate of prison area
This area is the passageway for people and vehicles entering the prison area. It is necessary to clearly monitor the situation of people and vehicles entering and leaving the prison area in real time to clearly distinguish the contour and features of faces.
Due to high definition requirements, the monitoring range is relatively large; The light change in the daytime is small and the light in the area at night is sufficient to meet the requirements of clear image acquisition; Therefore, a megapixel (720P) network camera should be used. The use of high-definition camera can greatly enhance the application value of the system. The clearer the image, the more obvious the details, and the higher the accuracy in intelligent applications. The prison gate is the key monitoring area of prison monitoring, so high-definition camera is the best choice.
6、Supervision area commanding point
The commanding heights of the prison area mainly include the top of the prison office building, the top of the teaching building, the top of the prison area gate, eccetera. These areas are the commanding heights of the prison area. The deployment of high-definition dynamic monitoring cameras can monitor the prison area environment 24 hours a day, 24 days a day in a large range, so as to ensure that there are no loopholes in security protection monitoring and emergency instructions; With the preset point patrol function, 360 ° dead angle monitoring can be achieved to ensure the safety of the monitoring area. In these areas, high-definition IP network infrared high-speed ball camera should be used.
It is required that the ball machine is manually programmed to set automatic cruise scanning at ordinary times, so that the monitoring surface is wider. In case of an emergency, the ball machine automatically rotates to the alarm area, where the image is zoomed in and close-up, and camera linkage tracking is set, so that the intruder has no hiding place.
The ball machine preset point patrol function is also a major feature of the intelligent high-speed ball. In the past, some monitoring systems used to use multiple fixed cameras to achieve multi-point monitoring when multi-point monitoring was needed. Due to the function of the intelligent ball, the previous multi-point monitoring may often be replaced by the intelligent ball.
The multiple points to be monitored can be set as preset points, and the conditions of each point can be observed by calling preset points. In addition, the intelligent ball belt has several preset points. The so-called patrol function refers to the ball machine scanning between preset points of, including scanning speed and dwell time of each preset point.
Due to the limitations of conventional inspection methods, it is mainly reflected in: the inspection process is a point-to-point movement, a spherical movement in three-dimensional space, that is, walking along a short curve of zui. If the user wants the smart ball to restore the user’s operation process between each point, or to repeat some specific simple actions, it is difficult to use the regular patrol function to restore.
Therefore, the intelligent ball has added a humanized self-learning function. With this function, all operations performed by the user on the ball machine within a specific time can be memorized and restored. Thus, some complex, specific, reciprocating track movements can be effectively repeated through the self-learning function. In addition, as cameras are deployed at the commanding heights of the monitoring area, effective lightning protection measures must be taken.
7、Public place
Canteen, outdoor activity area, playground, workplace and other public places are places where prisoners are relatively concentrated, which are prone to various abnormalities. In case of abnormalities, alarm signals shall be sent to the prison management department in a timely manner to deal with various abnormal phenomena. Due to the large contrast of light in these areas during the day and night, some monitoring points have weak light at night or have no light at all in the dark environment, so it is advisable to use infrared integrated cameras to meet the requirements of clear image acquisition in the prison public areas under all-weather and complex environments.
8、Perimeter, gate and ventilation area of prison wall
The monitoring, alarm system and intelligent analysis system can effectively ensure the safety of these places and the personnel in charge here, and can effectively cooperate with the prison guards to carry out alarm linkage to prevent prison escape.
The use of intelligent analysis monitoring has more advantages, security and durability than traditional video monitoring. It is equivalent to adding a brain behind the eyes, which can replace people to do some simple analysis work. Once there are target trigger rules, the intelligent analyzer can send out alarms and record alarm events in a timely and effective manner to improve management efficiency.
Intelligent analysis is applied to the prison perimeter, which can accurately and effectively analyze the movement of the perimeter. Through the detection, classification and tracking of moving objects, it can be seamlessly integrated with traditional video monitoring systems × Under the condition of 24-hour unattended, the visual intelligent solution of event setting, detection and recognition, and alarm triggering is adopted. The perimeter of the prison area shall be marked with a warning line to prevent prisoners from escaping from prison or illegal persons from invading.
Intelligent monitoring is adopted in the ventilation area to prevent crowd gathering, effectively improve the management of fighting, and timely remind the police on duty to pay attention to the situation. Intelligent analysis is adopted at the gate of the prison to capture vehicles or personnel entering and leaving the prison. All intelligent analysis can timely trigger alarm and upload alarm information.
In these areas that need intelligent monitoring, it is better to use high-definition infrared integrated camera with intelligent analyzer to achieve clear monitoring 24 hours a day. The camera selection requires that clear images can be provided in the environment with complex indoor and outdoor light, which requires that the camera must have the functions of strong backlight suppression, double filter switching day and night, and image and white balance can be adjusted according to the environment.
Conclusion
As a supplier of prison security system products and solutions, only by deeply understanding the application environment and use needs of the prison security system, and according to the construction standards of the prison security system of the Ministry of Justice and provincial prison bureaus, can we design systems and products that truly conform to the prison, and better build a prison security system that is as solid as gold.
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