At present, there are three main control system of a typical program, the following were each on the strengths and weaknesses of the system.
If installed properly, the traditional security system still has a few advantages. For example, through traditional analog transmission system, CCTV image quality is very good. Moreover, there is no need after a video network, it will not be video-inch extension on the issue. However, such a system in the inferior performance of the in camera and digital video equipment management system between the coaxial cable will be laid to occupy the building expensive space. As the coaxial cable does not support IP-based applications, so. If you decide to use the full IP-based security systems, the current customer base on the need to replace coaxial cable. Analog cameras in the coaxial cable-based facilities on the basis not on the same day can not support the audio-inch transmission, and IP-based cameras to the goods. At the same time, support data, voice and video streaming signal of a variety of large graphical user interface (GUll for video surveillance, the use of hybrid systems from analog technology to the investment lP security system should be commended. Once the system is IP-based, The system will be able to use IP networks to provide all the features, including remote monitoring, however, hybrid systems, there are some disadvantages, which is mainly embodied in an excellent analog video into a video lP costs associated with these decisions at the cost of analog signal transmission line before the digital Coding, as well as the physical location of the encoding / decoding occurred in the number of times, and video quality may be adversely affected.
LP and the standardization of the network provides a good interoperability and compatibility on the network lP not prepared to reduce the long-term infrastructure costs. For the cameras and other equipment for Power over Ethernet (POE) can be installed to further reduce the cost of electricity because it is centrally managed, and reduce the need to install the signal due to the number of wires inside the camera in be coded for transmission lP, and do not need to Converted to analog signals, so saving the cost of equipment conversion. Although lP systems and networking security system has many notable advantages, but there are potential flaws. The big flaw is that the bandwidth out of consideration, lT staff present in the video do not want their products on the network. Dimension, which needs to teach lT managers to understand the different video compression technology division to help ease their doubts.
2008年12月22日星期一
2008年12月21日星期日
Video Surveillance Knowledge
Video surveillance camera system is mainly composed of front-end parts, transmission parts, control, and records show that the majority of which consists of four. System so that managers at the control room can be observed in the region to prevent the front end to all activities and personnel records for the security of information systems to provide dynamic images.
With modern computer technology, multimedia technology, network technology and digital image compression technology and the rapid development of the birth of the DVR digital surveillance system is at the core of the multimedia computer monitor, to the management of the computer, not the people's subjective sense. At the same time, its own inherent properties for future development of a broad space, with the society as a whole digital, networks accelerate the pace of traditional analog control system is bound to be a new generation of digital, networked multimedia management control system To replace. As long as needed to be in place to monitor the installation of a certain number of cameras can be on duty at the control center to monitor real-time location of the district's staff activities, and to record preserved. For the investigation of the incident to provide first-hand information.
With modern computer technology, multimedia technology, network technology and digital image compression technology and the rapid development of the birth of the DVR digital surveillance system is at the core of the multimedia computer monitor, to the management of the computer, not the people's subjective sense. At the same time, its own inherent properties for future development of a broad space, with the society as a whole digital, networks accelerate the pace of traditional analog control system is bound to be a new generation of digital, networked multimedia management control system To replace. As long as needed to be in place to monitor the installation of a certain number of cameras can be on duty at the control center to monitor real-time location of the district's staff activities, and to record preserved. For the investigation of the incident to provide first-hand information.
How to Choose a Security Door
Installed anti-theft door at home but often stolen how the security door can really play a security role, the experts may wish to listen to the presentation.
Price Quality
As the saying goes, the price of a one freight, of course, do not rule out the possibility of business to make money, but as long as the quality of the hardware, this is a grain of truth. At present, there are two to three hundred dollars to sell anti-theft doors, to let an expert accounts, a qualified anti-theft lock in the price of hundred dollars more than the current anti-theft door manufacturer concentrated in the area in Zhejiang, Shaanxi Province to Zhejiang The freight will take about 40 yuan, plus installation costs 20 yuan, the city transport costs around 20 yuan, the door itself is not the cost of its additional costs have nearly 200 yuan, so the quality of such a door can be imagined. Industry experts Yucai Yang, qualified the security door of their normal price should not be less than 800 yuan bottom line.
There are also anti-theft door "ID card"
Qualified security door should have three "card." First, the local public security departments for the record books, and we must pay attention to whether the life of. Secondly, the product testing report. At present, the Ministry of Public Security and General Administration of Quality Supervision authorized testing agencies have seven, respectively, in Sichuan, Beijing, Shaanxi, Guangzhou, Wuhan, Shanghai, Shenyang, and is only valid for two years, expired null and void. Third, the lock detection separate report should be dedicated to anti-theft locks, is valid for two years, expired null and void.
From the outside to watch quality
In addition, when consumers can buy through their own testing to determine the quality of security door. First of all, due to the plate, the larger framework, such as weight, the weight of anti-theft doors in more than 60 kg. Second, turn off the sound when they should be very boring at the same time due to the thick steel plate is not easily deformed, so the gap after the installation of a more even, no small deformation of the phenomenon. Once again, tapping his hand on the surface of the door, issued a dull voice, its steel skeleton is not a filler, the steel skeleton of a normal voice should be clear. Finally, although the countries do not have clear anti-theft door without handrails, but the experiment proved that the handrails will be more and more of a force, it reduces the abnormal opening of the difficulty of the anti-theft outside the table so it is better not to add a good arm.
The more complex the key, the better
The key to the complexity of a direct impact on the structure of the anti-theft lock, the key to cross than the flat-key lock of the internal structure of much more complex, cross-lock four directions are billiards, and the lock plate as long as both sides have to billiards, in the same Under the best conditions for cross-lock option. Also the longer the key, the key point of convex-concave surface of the more complex the lock that the internal structure of the more complex the abnormal opening, the higher the degree of difficulty.
Price Quality
As the saying goes, the price of a one freight, of course, do not rule out the possibility of business to make money, but as long as the quality of the hardware, this is a grain of truth. At present, there are two to three hundred dollars to sell anti-theft doors, to let an expert accounts, a qualified anti-theft lock in the price of hundred dollars more than the current anti-theft door manufacturer concentrated in the area in Zhejiang, Shaanxi Province to Zhejiang The freight will take about 40 yuan, plus installation costs 20 yuan, the city transport costs around 20 yuan, the door itself is not the cost of its additional costs have nearly 200 yuan, so the quality of such a door can be imagined. Industry experts Yucai Yang, qualified the security door of their normal price should not be less than 800 yuan bottom line.
There are also anti-theft door "ID card"
Qualified security door should have three "card." First, the local public security departments for the record books, and we must pay attention to whether the life of. Secondly, the product testing report. At present, the Ministry of Public Security and General Administration of Quality Supervision authorized testing agencies have seven, respectively, in Sichuan, Beijing, Shaanxi, Guangzhou, Wuhan, Shanghai, Shenyang, and is only valid for two years, expired null and void. Third, the lock detection separate report should be dedicated to anti-theft locks, is valid for two years, expired null and void.
From the outside to watch quality
In addition, when consumers can buy through their own testing to determine the quality of security door. First of all, due to the plate, the larger framework, such as weight, the weight of anti-theft doors in more than 60 kg. Second, turn off the sound when they should be very boring at the same time due to the thick steel plate is not easily deformed, so the gap after the installation of a more even, no small deformation of the phenomenon. Once again, tapping his hand on the surface of the door, issued a dull voice, its steel skeleton is not a filler, the steel skeleton of a normal voice should be clear. Finally, although the countries do not have clear anti-theft door without handrails, but the experiment proved that the handrails will be more and more of a force, it reduces the abnormal opening of the difficulty of the anti-theft outside the table so it is better not to add a good arm.
The more complex the key, the better
The key to the complexity of a direct impact on the structure of the anti-theft lock, the key to cross than the flat-key lock of the internal structure of much more complex, cross-lock four directions are billiards, and the lock plate as long as both sides have to billiards, in the same Under the best conditions for cross-lock option. Also the longer the key, the key point of convex-concave surface of the more complex the lock that the internal structure of the more complex the abnormal opening, the higher the degree of difficulty.
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