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Pacific Security Network News ]
The surveillance camera is a quasi-camera used in security. Its pixel and resolution are higher than the video head of the computer, and lower than the professional digital camera or dv. Most of the surveillance cameras are just a single video capture device, and rarely have data storage capabilities. The surveillance cameras are mainly divided into gun type, hemisphere and high speed ball type, which are widely used in many security fields such as banking, transportation and safe city. The camera is divided into an analog camera and a network camera. Although the current application is more of a network camera, due to the characteristics of the analog camera itself, the analog camera cannot be completely replaced by the network camera.
Where is the difference between the two? I believe that the definition can be derived literally, that is, the network camera can be networked, and the analog camera cannot, but what is the specific difference?
First of all, the concept should be clarified:
The front end of the analog camera (Camera) uses an interlaced CMOS/CCD sensor to convert the optical signal into an analog electrical signal, and then outputs it to the DSP. The DSP performs A/D conversion and color adjustment processing and then performs D/A conversion to PAL/ NTSC standard TV signal output.
The IP Camera integrates the video compression and network transmission processing module DVS based on the analog camera (Camera), which combines the technical features of the analog camera and the video server. The network camera can be operated independently as long as it is placed in any location with an IP network interface. In addition to the image capture function of the traditional camera, the network camera also has a digital compression controller and a WEB-based operating system (including a web server, an FTP server, etc.), so that the video data is compressed and encrypted, and then passed through the network ( LAN, Internet or wireless network) to the end user, and the remote user can access the network camera on the PC using a standard web browser or client software, real-time monitoring of the target site, and image data Real-time storage, in addition to the camera to control the pan/tilt and lens of the camera for full-scale monitoring.
Image formulated as follows: IP Camera = single DVS + Camera
Second, the performance is very different:
First, clarity. Seeing more clearly is the goal pursued by every user and the ultimate mission of the security industry.
Network cameras can already reach millions, 2 million, 5 million or even 10 million pixel image output
Analog cameras can only have CIF, D1 image output.
Second, manage differences.
The webcam has a built-in WEB that manages and views images using a standard WEB browser on a PC. At the same time, the network camera can also realize remote management and image viewing, and the image data is stored on the remote hard disk, which is easy to search, easy to store, and will not be destroyed;
The analog camera is relatively a closed system. It can only be monitored internally. It cannot be monitored remotely. The video data can only be stored locally or remotely. It is easily destroyed by criminals.
Third, integration.
The network camera has a built-in control system. It can manage and view images using the standard WEB browser on any PC, and can be shared with multi-screen management software to achieve multi-channel monitoring. The number of channels is not limited, no hardware is added. Cost of money;
The analog camera is connected to the DVR. The number of DVRs has a certain limit. After the DVR is full, the cost of the hardware is increased when the camera is added.
Fourth, the installation of the camera.
The network camera simply connects it to the nearest network and assigns an IP address. It can use the existing network as a transmission platform without wiring;
Analog cameras need to be connected to each camera and connected to the control platform, video equipment, display equipment, re-wiring every additional way, and no off-the-shelf network can be utilized.
Fifth, the realization of remote monitoring.
The network camera can be remotely managed, such as video settings, pan/tilt control, alarm settings, two-way intercom, and advanced management.
Analog cameras can only be viewed locally for viewing.
Fifth, the realization of remote monitoring.
The network camera can be remotely managed, such as video settings, pan/tilt control, alarm settings, two-way intercom, and advanced management.
Analog cameras can only be viewed locally for viewing.
Sixth, scalability
Webcam: Easily add more webcams to your system.
Analog cameras: It is very difficult to expand the work. Each analog camera requires a dedicated cable, which affects the image quality when using long cables.
Seventh, the cost of funds.
Network cameras are typically used for high-quality network cables that cost 30% to 40% less than coaxial cables of the same size. A single network cable can support hundreds of network cameras and other devices at the same time;
Analog cameras all require a cable to connect. If there are multiple cameras, it is necessary to purchase a lot of cables and pay for the installation and deployment of these cables. Overall, the manpower and maintenance costs are high.
It can be seen from the comparison of the above aspects that the network camera is superior to the analog camera in many aspects, but this is not absolute. The network camera has higher requirements on the external environment and needs a very strict network environment. The requirements are relatively high, and the cost of back-end storage is relatively high. However, there are some delays, disconnections, and congestion problems in the network application environment in many places in China. In this case, the advantages of analog cameras are It is highlighted, so in addition to considering its own needs, users should also reasonably evaluate their environment to avoid unnecessary losses.
