In addition to remote monitoring of the Internet camera through the Internet in any corner of the world, network monitoring can also effectively reduce costs. Its "plug and play" feature eliminates the need for coaxial cables to be installed as analog cameras. What kind of functional advantage does it occupy the entire market?
Broadly speaking, the integration process of the security industry into the IP network involves many factors, not only limited to the different aspects of the network cameras and analog cameras that will be discussed below. Factors such as system performance, openness, interoperability, flexibility, sustainability, and network connectivity are all important considerations. However, this article will mainly discuss the 10 most important differences between current network cameras and analog cameras, and further analyze why these differences are the key factors that users must consider when purchasing the next camera.
Reason 1: End Deinterlacing Problem The analog camera suffers from a very prominent problem at high resolution (4CIF), which is the problem of interlacing. This is because the analog video image is composed of some line scan signals, and each complete picture is composed of two interlaced field signals, even if the analog signal is connected to the DVR. This means that every image we see is a combination of two “half†images with different acquisition times. Fig. 3 compares the actual effects of interlaced scanning and progressive scanning, and the car in the picture travels at a speed of 20 km/h. As can be seen from the figure, the stationary objects (such as the brick wall) in the picture can be clearly displayed whether it is a progressive scan or an interlaced scan. But for moving objects (such as cars and drivers), the interlaced picture is obviously blurred. As can be seen from the enlarged screen details, the driver's facial contours can be clearly identified from the screen using progressive scanning, and interlaced scanning cannot be clearly seen at all. If the driver is a car theft thief, then obviously the interlaced picture is useless for the hunt.
Reason 2: Support PoE technology, effectively save costs, improve system reliability PoE (Power over Ethernet), refers to the technology for providing power for Ethernet devices through Ethernet, as stipulated by the IEEE802.3af standard, is a mature standard for the IT industry. PoE technology enables network devices to simultaneously receive data and operating power through the same Ethernet Category 5 cable. The fact proves that this technology can save users a lot of installation costs. This means that users do not have to perform power installation work for cameras that support PoE. In analog video surveillance systems, supplying power to analog cameras has always been a major engineering difficulty and one of the major costs. In addition, PoE-enabled network cameras can also be used in conjunction with UPS uninterruptible power supply systems to achieve centralized power management, thereby greatly improving the reliability of the system and enabling the network cameras to function normally even in the event of a power outage. It can be seen from Figure 4 that network cameras can benefit from PoE technology whether they support PoE or not.
Reason 3: megapixel resolution Due to the NTSC/PAL specification, the maximum resolution of analog cameras has been limited to 4CIF, which is approximately equivalent to 400,000 pixels. In recent years, high-resolution computer monitors and digital cameras have appeared, and end-users have also begun to request image resolution up to the megapixel level. End-users of video surveillance applications have also started to make similar demands. The highest resolution of webcams can reach megapixels or higher, so they can provide more detail and cover a larger area (Figure 5). The high resolution ensures that when a security incident occurs, the perpetrator's facial features or the items they carry can be clearly distinguished from the video or surveillance video, so that the user will not waste investment in the security system. In addition, the high resolution feature allows the network camera to provide users with special features such as digital PTZ (Pan/Tilt/Zoom).
Reason 4: Integrate intelligence into the front-end In the current video surveillance system, there are too many video data to be recorded and stored, but most of these data are inconsequential screens. Important event information is often submerged in massive amounts of information. In the video material, it has brought great difficulty to the analysis and processing of the incident, and it has also wasted valuable storage resources. The latest emerging smart video technology offers the possibility to solve this widespread problem and has become the next major trend in the development of online video. High-end network cameras can fully meet the needs of intelligent video applications, they can have built-in video detection (VMD) and event management capabilities, so the camera itself can decide when to send video, what frame rate and resolution to send, and Whenever an alarm should be given to a security officer, they are prompted to monitor the screen or take appropriate action. Even some advanced intelligent video analysis algorithms (such as license plate number recognition, people counting, etc.) can be integrated into the webcam. By using a network camera, it is possible to integrate the intelligence of the system into the front-end equipment for video surveillance, enabling the user to obtain a more effective and powerful video surveillance solution than a conventional DVR or other centralized system.
The intelligent network camera also solves another dilemma that is constantly emerging in the field of video surveillance: due to limitations in computing power, centralized video surveillance systems cannot achieve real-time analysis of large amounts of video information. The network camera has dedicated and highly integrated hardware devices, which can implement advanced video analysis algorithms. This feature greatly reduces the performance requirements of the back-end devices, enabling users to build ultra-large-scale intelligent video systems. .
Reason 5: Integrated PTZ Control and Input/Output Ports For analog cameras, if you need to implement PTZ (PTZ and Zoom) control, in addition to video cabling, you also need to provide dedicated lines for control signals, which undoubtedly increases the The cost and inconvenience to the construction. Network cameras can transmit video signals and PTZ control commands over the same network, which can greatly 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. In addition to these features, it can further save users the cost, but also further increase the functionality of the network camera and the potential for integration with other systems.
Reason 6: Integrated audio In some applications, audio information becomes more and more important. 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. In fact, only the webcam can make the audio support easy to install and cost-effective. It can also support full-duplex audio, allowing users to use audio functions as easily as using a telephone. In the example of FIG. 7, the network camera enables the user to perform two-way audio communication with the visitor and remotely control the opening and closing of the gate.
Reason 7: Secure Communications 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. What's worse is that people with bad feelings can also switch from one important video surveillance signal to another, so that the user's video surveillance system completely fails (as often happens in movies). But for the network video system, 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 authenticate connection requests by using highly secure digital certificates to ensure that only specific network cameras can access the system, effectively avoiding fraud. The network camera may also include “watermark†information in the video data. The “watermark†information may include image summary, time, place, date, user information, alarm information, etc., so as to ensure that the system saves valid after the security event occurs. evidence. The above functions are virtually impossible to achieve in analog cameras.
Reason 8: Based on flexible, economical and practical infrastructure analog video signals are usually transmitted through expensive coaxial cable, private optical fiber or wireless technology, regardless of the transmission technology, the image quality will be affected by the transmission distance. When transmitting analog video signals over long distances, various intermediate devices must be precisely matched and adjusted to ensure that the degradation of image quality is within an acceptable range. In addition, the wiring of the camera for power supply, addition of alarm input and output, and audio cabling will further complicate the installation and deployment. IP-based digital systems can overcome these difficulties at a relatively low cost and provide users with more options. Just as it is possible to view the pictures on the Internet from any place in the world, you can watch the digital pictures provided by the network cameras through the Internet in any corner of the world. These pictures will never be over oceans. Long-distance transmission causes quality degradation.
Unlike analog video, IP network technology is a mature technology of a globally unified standard, so IP-based video streams can be transmitted globally through various compatible infrastructures. Due to the use of packet-based communication types, many different types of data streams can be transmitted over the same data line. In some new projects, the use of low-cost Category 5 data lines is often used. In a Gigabit Ethernet network, a single data line can simultaneously transmit hundreds of full-frame-rate video streams.
Reason No. 9: True digital solution In the analog camera, the analog signal generated by the CCD sensor will be first converted into a digital signal by the A/D (Analog/Digital) converter so that the video image can be processed by the built-in DSP chip. Deal with and improve. The DSP-processed digital image signal is then converted back to an analog signal for transmission over the coaxial cable. Finally, when the analog signal reaches the back-end DVR, it is re-digitized by the DVR and then stored on the hard disk. It can be seen that in this process, the image signal undergoes three conversions, and each conversion results in a different degree of degradation of the image quality. In the network camera, the image will remain digitized after being digitized, without the need for multiple times/modulo or analog/digital conversions, thereby avoiding degradation of image quality.
Reason 10: Lower Total Cost of Ownership When talking about the series of advanced features of the above network cameras, some people may say that these advanced functions are bound to increase the cost of equipment. Of course, if you just compare the price of the camera itself, the webcam is certainly more expensive. However, if the object of comparison is the cost of each video signal, then a highly flexible and high-performance network camera can obviously be compared with a DVR-based analog system. Since the application and storage functions of the back end of the network video system can use those industry-standard open-standard-based server hardware, it is not necessary to use a dedicated hardware platform (such as a DVR) as in the analog system.
Therefore, in many system configurations, the front-end equipment cost of a video surveillance system based on a network camera even appears to be lower. This is particularly important for some large systems because storage and server hardware often account for a large part of the overall cost, while the use of network cameras can greatly reduce the cost of equipment management and acquisition. The cost savings also come from the infrastructure used by the network cameras. In addition to carrying video surveillance services, various IP-based networks such as the Internet, LAN, and wireless networks can also carry other types of applications within the enterprise. Compared with traditional coaxial cables and optical fibers, the construction cost of these networks is very low. .
Conclusion: In the future, JPFreeman, a well-known industry analyst for network cameras, predicts that in the field of video surveillance, the network camera market will be the fastest growing market, and network camera sales will surpass analog cameras in 2008. Because IP-based network security management (Security Management) has greatly expanded people's understanding and implementation of security management tools, it is considered to be the development direction of the next generation of advanced security management. On the other hand, analog cameras are not able to meet the requirements of next-generation security management due to their deficiencies in flexibility and performance, and are bound to be replaced by network cameras.
Because the network camera strips image frames and intelligently processes images from a back-end device such as a DVR, the size of the video surveillance system is no longer limited by the computing power of the back-end device. Expandability is greatly improved. End users of network video surveillance systems can choose to use cost-effective general-purpose servers for video recording and storage. At the same time, they can select the most suitable products for their needs from a large number of video management and analysis software. In summary, the network camera enables users to transfer their applications from a dedicated device (DVR) to an open system. In addition, the network camera enables users to take full advantage of the advantages of networking, digitization, and intelligence, all of which will constitute a powerful force. The promotion force makes more and more users choose webcam.
Broadly speaking, the integration process of the security industry into the IP network involves many factors, not only limited to the different aspects of the network cameras and analog cameras that will be discussed below. Factors such as system performance, openness, interoperability, flexibility, sustainability, and network connectivity are all important considerations. However, this article will mainly discuss the 10 most important differences between current network cameras and analog cameras, and further analyze why these differences are the key factors that users must consider when purchasing the next camera.
Reason 1: End Deinterlacing Problem The analog camera suffers from a very prominent problem at high resolution (4CIF), which is the problem of interlacing. This is because the analog video image is composed of some line scan signals, and each complete picture is composed of two interlaced field signals, even if the analog signal is connected to the DVR. This means that every image we see is a combination of two “half†images with different acquisition times. Fig. 3 compares the actual effects of interlaced scanning and progressive scanning, and the car in the picture travels at a speed of 20 km/h. As can be seen from the figure, the stationary objects (such as the brick wall) in the picture can be clearly displayed whether it is a progressive scan or an interlaced scan. But for moving objects (such as cars and drivers), the interlaced picture is obviously blurred. As can be seen from the enlarged screen details, the driver's facial contours can be clearly identified from the screen using progressive scanning, and interlaced scanning cannot be clearly seen at all. If the driver is a car theft thief, then obviously the interlaced picture is useless for the hunt.
Reason 2: Support PoE technology, effectively save costs, improve system reliability PoE (Power over Ethernet), refers to the technology for providing power for Ethernet devices through Ethernet, as stipulated by the IEEE802.3af standard, is a mature standard for the IT industry. PoE technology enables network devices to simultaneously receive data and operating power through the same Ethernet Category 5 cable. The fact proves that this technology can save users a lot of installation costs. This means that users do not have to perform power installation work for cameras that support PoE. In analog video surveillance systems, supplying power to analog cameras has always been a major engineering difficulty and one of the major costs. In addition, PoE-enabled network cameras can also be used in conjunction with UPS uninterruptible power supply systems to achieve centralized power management, thereby greatly improving the reliability of the system and enabling the network cameras to function normally even in the event of a power outage. It can be seen from Figure 4 that network cameras can benefit from PoE technology whether they support PoE or not.
Reason 3: megapixel resolution Due to the NTSC/PAL specification, the maximum resolution of analog cameras has been limited to 4CIF, which is approximately equivalent to 400,000 pixels. In recent years, high-resolution computer monitors and digital cameras have appeared, and end-users have also begun to request image resolution up to the megapixel level. End-users of video surveillance applications have also started to make similar demands. The highest resolution of webcams can reach megapixels or higher, so they can provide more detail and cover a larger area (Figure 5). The high resolution ensures that when a security incident occurs, the perpetrator's facial features or the items they carry can be clearly distinguished from the video or surveillance video, so that the user will not waste investment in the security system. In addition, the high resolution feature allows the network camera to provide users with special features such as digital PTZ (Pan/Tilt/Zoom).
Reason 4: Integrate intelligence into the front-end In the current video surveillance system, there are too many video data to be recorded and stored, but most of these data are inconsequential screens. Important event information is often submerged in massive amounts of information. In the video material, it has brought great difficulty to the analysis and processing of the incident, and it has also wasted valuable storage resources. The latest emerging smart video technology offers the possibility to solve this widespread problem and has become the next major trend in the development of online video. High-end network cameras can fully meet the needs of intelligent video applications, they can have built-in video detection (VMD) and event management capabilities, so the camera itself can decide when to send video, what frame rate and resolution to send, and Whenever an alarm should be given to a security officer, they are prompted to monitor the screen or take appropriate action. Even some advanced intelligent video analysis algorithms (such as license plate number recognition, people counting, etc.) can be integrated into the webcam. By using a network camera, it is possible to integrate the intelligence of the system into the front-end equipment for video surveillance, enabling the user to obtain a more effective and powerful video surveillance solution than a conventional DVR or other centralized system.
The intelligent network camera also solves another dilemma that is constantly emerging in the field of video surveillance: due to limitations in computing power, centralized video surveillance systems cannot achieve real-time analysis of large amounts of video information. The network camera has dedicated and highly integrated hardware devices, which can implement advanced video analysis algorithms. This feature greatly reduces the performance requirements of the back-end devices, enabling users to build ultra-large-scale intelligent video systems. .
Reason 5: Integrated PTZ Control and Input/Output Ports For analog cameras, if you need to implement PTZ (PTZ and Zoom) control, in addition to video cabling, you also need to provide dedicated lines for control signals, which undoubtedly increases the The cost and inconvenience to the construction. Network cameras can transmit video signals and PTZ control commands over the same network, which can greatly 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. In addition to these features, it can further save users the cost, but also further increase the functionality of the network camera and the potential for integration with other systems.
Reason 6: Integrated audio In some applications, audio information becomes more and more important. 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. In fact, only the webcam can make the audio support easy to install and cost-effective. It can also support full-duplex audio, allowing users to use audio functions as easily as using a telephone. In the example of FIG. 7, the network camera enables the user to perform two-way audio communication with the visitor and remotely control the opening and closing of the gate.
Reason 7: Secure Communications 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. What's worse is that people with bad feelings can also switch from one important video surveillance signal to another, so that the user's video surveillance system completely fails (as often happens in movies). But for the network video system, 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 authenticate connection requests by using highly secure digital certificates to ensure that only specific network cameras can access the system, effectively avoiding fraud. The network camera may also include “watermark†information in the video data. The “watermark†information may include image summary, time, place, date, user information, alarm information, etc., so as to ensure that the system saves valid after the security event occurs. evidence. The above functions are virtually impossible to achieve in analog cameras.
Reason 8: Based on flexible, economical and practical infrastructure analog video signals are usually transmitted through expensive coaxial cable, private optical fiber or wireless technology, regardless of the transmission technology, the image quality will be affected by the transmission distance. When transmitting analog video signals over long distances, various intermediate devices must be precisely matched and adjusted to ensure that the degradation of image quality is within an acceptable range. In addition, the wiring of the camera for power supply, addition of alarm input and output, and audio cabling will further complicate the installation and deployment. IP-based digital systems can overcome these difficulties at a relatively low cost and provide users with more options. Just as it is possible to view the pictures on the Internet from any place in the world, you can watch the digital pictures provided by the network cameras through the Internet in any corner of the world. These pictures will never be over oceans. Long-distance transmission causes quality degradation.
Unlike analog video, IP network technology is a mature technology of a globally unified standard, so IP-based video streams can be transmitted globally through various compatible infrastructures. Due to the use of packet-based communication types, many different types of data streams can be transmitted over the same data line. In some new projects, the use of low-cost Category 5 data lines is often used. In a Gigabit Ethernet network, a single data line can simultaneously transmit hundreds of full-frame-rate video streams.
Reason No. 9: True digital solution In the analog camera, the analog signal generated by the CCD sensor will be first converted into a digital signal by the A/D (Analog/Digital) converter so that the video image can be processed by the built-in DSP chip. Deal with and improve. The DSP-processed digital image signal is then converted back to an analog signal for transmission over the coaxial cable. Finally, when the analog signal reaches the back-end DVR, it is re-digitized by the DVR and then stored on the hard disk. It can be seen that in this process, the image signal undergoes three conversions, and each conversion results in a different degree of degradation of the image quality. In the network camera, the image will remain digitized after being digitized, without the need for multiple times/modulo or analog/digital conversions, thereby avoiding degradation of image quality.
Reason 10: Lower Total Cost of Ownership When talking about the series of advanced features of the above network cameras, some people may say that these advanced functions are bound to increase the cost of equipment. Of course, if you just compare the price of the camera itself, the webcam is certainly more expensive. However, if the object of comparison is the cost of each video signal, then a highly flexible and high-performance network camera can obviously be compared with a DVR-based analog system. Since the application and storage functions of the back end of the network video system can use those industry-standard open-standard-based server hardware, it is not necessary to use a dedicated hardware platform (such as a DVR) as in the analog system.
Therefore, in many system configurations, the front-end equipment cost of a video surveillance system based on a network camera even appears to be lower. This is particularly important for some large systems because storage and server hardware often account for a large part of the overall cost, while the use of network cameras can greatly reduce the cost of equipment management and acquisition. The cost savings also come from the infrastructure used by the network cameras. In addition to carrying video surveillance services, various IP-based networks such as the Internet, LAN, and wireless networks can also carry other types of applications within the enterprise. Compared with traditional coaxial cables and optical fibers, the construction cost of these networks is very low. .
Conclusion: In the future, JPFreeman, a well-known industry analyst for network cameras, predicts that in the field of video surveillance, the network camera market will be the fastest growing market, and network camera sales will surpass analog cameras in 2008. Because IP-based network security management (Security Management) has greatly expanded people's understanding and implementation of security management tools, it is considered to be the development direction of the next generation of advanced security management. On the other hand, analog cameras are not able to meet the requirements of next-generation security management due to their deficiencies in flexibility and performance, and are bound to be replaced by network cameras.
Because the network camera strips image frames and intelligently processes images from a back-end device such as a DVR, the size of the video surveillance system is no longer limited by the computing power of the back-end device. Expandability is greatly improved. End users of network video surveillance systems can choose to use cost-effective general-purpose servers for video recording and storage. At the same time, they can select the most suitable products for their needs from a large number of video management and analysis software. In summary, the network camera enables users to transfer their applications from a dedicated device (DVR) to an open system. In addition, the network camera enables users to take full advantage of the advantages of networking, digitization, and intelligence, all of which will constitute a powerful force. The promotion force makes more and more users choose webcam.
Hydrofluoroether cleaning solution is a kind of colorless, odorless, non-toxic and harmless insulating and environmentally friendly product. It is an inert cleaning agent with high dielectric constant, very low surface tension, low viscosity, volatile and no residue and stable hydrofluoroether. It can well spread the surface of the dispersed substrate and various pores to achieve the ideal flushing, wet cleaning and washing, and has a suitable boiling point, which can be well applied to various evaporation cycle cleaning equipment. This product is widely used in the cleaning of various precision substrates.
Cleaning Solution For Electronic Circuit Board
Cleaning Liquid,Electronic Circuit Board Cleaning Solution,Cleaning Solution For Circuit Board,Cleaning Solution For Electronic Circuit Board
Guangdong Giant Fluorine Energy Saving Technology Co.,Ltd , https://www.tuwtech.com