End interlacing problem
Analog cameras encounter interlacing problems at high resolutions. Since the analog video image is composed of two interlaced field signals (even if the analog signal is connected to the DVR), this means that each image we see is composed of two “half frames†with different acquisition times. Image merged. When the objects in the picture move faster, the picture becomes blurred. The network camera employs a progressive scan technology to perform a one-time scan on a complete picture, effectively solving this problem.
Support PoE technology
PoE (Power over Ethernet) technology enables network equipment to simultaneously receive data and operating power over an Ethernet Cat 5 cable, which means that users do not have to install power supplies specifically for cameras that support PoE functions, but in analog video surveillance systems. Power supply for analog cameras has always been one of the engineering difficulties and the main cost. In addition, PoE-enabled network cameras can also be used with UPS systems to achieve centralized power management and improve system reliability.
Megapixel resolution
Due to the constraints of related systems, the highest resolution of analog cameras has been limited to 4CIF (approximately equivalent to 400,000 pixels). The highest resolution of webcams can reach megapixels or higher, so they can provide more detail and cover larger areas. In addition, the high resolution feature enables the network camera to provide users with special features such as digital PTZ (PTZ and Zoom).
Integrate intelligence into the front end
In the current video surveillance system, there are too many video data to be recorded and stored. The information of important events is often overwhelmed by massive video data, which brings great difficulty to the analysis and processing of events. Wasted valuable storage resources. High-end network cameras can integrate intelligent video technology into video surveillance front-end devices, and have many advanced intelligent video analysis algorithms, which greatly reduces the performance requirements for back-end devices.
Integrated PTZ control
For analog cameras, if you need to implement PTZ control, in addition to video cabling, you also need to provide dedicated lines for control signals. Network cameras can transmit video signals and PTZ control commands over the same network to reduce installation costs and give users greater flexibility. In addition, the network camera can also integrate alarm input and output ports, enabling linkage control of alarms, door locks and other security systems.
Integrated audio
For analog systems, if audio support is required, it can only be achieved through additional audio cabling. The network camera can capture audio information in the front-end through a built-in microphone or other external device, synchronize the audio information with the video information, and even directly integrate the audio information into the video stream, and finally send the data back to the monitoring or through the network. On video equipment.
Secure communication
Analog cameras use coaxial cables to transmit video information without any encryption and authentication mechanisms. In this case, as long as the location of the video cable can be known, anyone can watch the video picture transmitted therein by means of tapping. The network camera can first encrypt the collected video signal and then transmit it through the network, so as to ensure that the video information cannot be obtained or tampered by unauthorized persons. The system can also authenticate connection requests by using highly secure digital certificates to ensure that only specific network cameras can access the system, effectively avoiding fraud.
Flexible infrastructure
Analog video signals are often transmitted using expensive coaxial cables, proprietary optical fibers, or wireless technologies, and the image quality is often affected by the transmission distance. IP-based video streams can be transmitted globally through various compatible infrastructures. In some new projects, low-cost Category 5 data lines are often used. In a Gigabit Ethernet network, a single data line can simultaneously transmit hundreds of full frame-rate video streams.
Real digitization
In the analog camera, the analog signal generated by the CCD sensor is first converted into a digital signal. After being processed by the built-in DSP chip, the analog signal is again converted into an analog signal and transmitted on the coaxial cable. Finally, when the analog signal reaches the back-end DVR, it is again digitized and then stored on the hard disk. In this process, the three conversions of the image signal will cause the image quality to decline. In a webcam, the image will remain digitized after it has been digitized, eliminating the need for multiple-times/modulo or analog/digital conversions.
Lower total cost of ownership
If you compare the price of the camera itself, the network camera must be more expensive. However, the application and storage functions of the back end of the network video system can use those industry-standard open-standard-based server hardware without having to use a dedicated hardware platform (such as a DVR) as in the analog system. In addition, compared with traditional coaxial cables and optical fibers, the use of various IP-based networks such as the Internet, LAN, and wireless networks as the bearer construction costs is very low.
Analog cameras encounter interlacing problems at high resolutions. Since the analog video image is composed of two interlaced field signals (even if the analog signal is connected to the DVR), this means that each image we see is composed of two “half frames†with different acquisition times. Image merged. When the objects in the picture move faster, the picture becomes blurred. The network camera employs a progressive scan technology to perform a one-time scan on a complete picture, effectively solving this problem.
Support PoE technology
PoE (Power over Ethernet) technology enables network equipment to simultaneously receive data and operating power over an Ethernet Cat 5 cable, which means that users do not have to install power supplies specifically for cameras that support PoE functions, but in analog video surveillance systems. Power supply for analog cameras has always been one of the engineering difficulties and the main cost. In addition, PoE-enabled network cameras can also be used with UPS systems to achieve centralized power management and improve system reliability.
Megapixel resolution
Due to the constraints of related systems, the highest resolution of analog cameras has been limited to 4CIF (approximately equivalent to 400,000 pixels). The highest resolution of webcams can reach megapixels or higher, so they can provide more detail and cover larger areas. In addition, the high resolution feature enables the network camera to provide users with special features such as digital PTZ (PTZ and Zoom).
Integrate intelligence into the front end
In the current video surveillance system, there are too many video data to be recorded and stored. The information of important events is often overwhelmed by massive video data, which brings great difficulty to the analysis and processing of events. Wasted valuable storage resources. High-end network cameras can integrate intelligent video technology into video surveillance front-end devices, and have many advanced intelligent video analysis algorithms, which greatly reduces the performance requirements for back-end devices.
Integrated PTZ control
For analog cameras, if you need to implement PTZ control, in addition to video cabling, you also need to provide dedicated lines for control signals. Network cameras can transmit video signals and PTZ control commands over the same network to reduce installation costs and give users greater flexibility. In addition, the network camera can also integrate alarm input and output ports, enabling linkage control of alarms, door locks and other security systems.
Integrated audio
For analog systems, if audio support is required, it can only be achieved through additional audio cabling. The network camera can capture audio information in the front-end through a built-in microphone or other external device, synchronize the audio information with the video information, and even directly integrate the audio information into the video stream, and finally send the data back to the monitoring or through the network. On video equipment.
Secure communication
Analog cameras use coaxial cables to transmit video information without any encryption and authentication mechanisms. In this case, as long as the location of the video cable can be known, anyone can watch the video picture transmitted therein by means of tapping. The network camera can first encrypt the collected video signal and then transmit it through the network, so as to ensure that the video information cannot be obtained or tampered by unauthorized persons. The system can also authenticate connection requests by using highly secure digital certificates to ensure that only specific network cameras can access the system, effectively avoiding fraud.
Flexible infrastructure
Analog video signals are often transmitted using expensive coaxial cables, proprietary optical fibers, or wireless technologies, and the image quality is often affected by the transmission distance. IP-based video streams can be transmitted globally through various compatible infrastructures. In some new projects, low-cost Category 5 data lines are often used. In a Gigabit Ethernet network, a single data line can simultaneously transmit hundreds of full frame-rate video streams.
Real digitization
In the analog camera, the analog signal generated by the CCD sensor is first converted into a digital signal. After being processed by the built-in DSP chip, the analog signal is again converted into an analog signal and transmitted on the coaxial cable. Finally, when the analog signal reaches the back-end DVR, it is again digitized and then stored on the hard disk. In this process, the three conversions of the image signal will cause the image quality to decline. In a webcam, the image will remain digitized after it has been digitized, eliminating the need for multiple-times/modulo or analog/digital conversions.
Lower total cost of ownership
If you compare the price of the camera itself, the network camera must be more expensive. However, the application and storage functions of the back end of the network video system can use those industry-standard open-standard-based server hardware without having to use a dedicated hardware platform (such as a DVR) as in the analog system. In addition, compared with traditional coaxial cables and optical fibers, the use of various IP-based networks such as the Internet, LAN, and wireless networks as the bearer construction costs is very low.
Formaldehyde Solution 37% 40%,Paraformaldehyde Powder High Quality,Paraformaldehyde 96% Best Price,96% Paraformaldehyde
Shijiazhuang Xinlongwei Chemical Co., Ltd. , https://www.xinlongwei-chem.com