[ Huaqiang Security Network News ] Network cameras have entered people's lives, but how to buy your favorite network cameras correctly? This chapter is for everyone to read from eight aspects. 
(1) Image quality <br> When looking at the image quality of a network camera, we must consider the following questions: 1 What is its light sensitivity? What is the minimum lighting requirement for camera operation? 2 How many levels can its image clarity be divided into? 3 Does it have a high quality lens? 4 What is the image quality when there is a lot of motion in the picture? Obviously, image quality is one of the important performance indicators of any camera, especially in some applications related to life and property safety, the importance of image quality is more significant. If the camera is unable to provide a high-quality video, then exploring other factors and features becomes meaningless. Ultra-clear image quality allows users to more accurately track details and changes in the picture, and to make decisions faster and better, providing more effective protection for people and property. For automatic image analysis and alarm tools (such as camera built-in motion detection and other intelligent functions), ultra-clear image quality can greatly improve their analysis and alarm accuracy.
The product data sheet may contain partial answers to the above questions, but be sure to perform a field test on the camera to ensure that the product characteristics described in the data sheet truly meet the needs of your application.
(2) Product Lines <br> Network cameras have many more functions than analog cameras, such as built-in image compression, motion detection, network connection and transmission, event and alarm management, and more. When the system needs to be expanded, you usually want the extended system to have the same or even more features than before. The best way to achieve this goal is to select a small number of product suppliers and maintain long-term cooperation. When selecting a supplier, you should select those manufacturers with a full product line. Their product line should include at least a fixed camera, a fixed dome camera, and a full range of PTZ cameras. In this case, one or two vendors can fully meet your current and future application needs, and you can easily upgrade to megapixel resolution, add wireless transmission capabilities or audio support to your system. If your existing system includes analog cameras and needs to be integrated into a digital system, select those products that also include video servers (encoders), video decoders, protective covers, and other related accessories.
(3) Product integration and back-end application software support <br> You are considering whether the purchased network camera is in a closed system, so that you have little choice for the back-end application software, even a set of video Management software to choose from? You know, the security industry is not just moving closer to network cameras, but more importantly it is transforming into open systems and hardware platforms. Therefore, the network cameras produced by excellent manufacturers must also conform to industry standards, have an open programmable interface (API), have strong integration, and can definitely provide a broad space for your back-end software selection. Some leading companies even have hundreds of partners around the world, providing users with hundreds of back-end management software to choose from. In the long run, open, multi-vendor systems will always dominate the market.
(4) Image compression format MJPEG and MPEG-4 are two image compression formats commonly used in network video surveillance. Both have advantages in image quality and bandwidth occupancy. Therefore, an excellent network camera should support both compressions at the same time. The format allows the user to select the appropriate format to optimize image quality and bandwidth resources based on the actual environment of the application. More importantly, excellent network cameras should perform image compression 100% in accordance with MJPEG and MPEG-4 international standards. When you find that companies that claim that their products meet certain criteria do not actually comply with the standard 100%, it is inevitable that 99% of the compliance is actually equal to non-conformance. Full compliance with international standards ensures that you can use video streams from different applications, as well as ensuring that you can still view the images you are recording after 10 years. Conversely, if a camera uses a company's proprietary compression technology, once the company exits the market, the end user's interests are inevitably lost.
(5) Device configuration and management tools <br> Like other intelligent network devices, network cameras have their own independent IP address and built-in firmware (Firmware), many manufacturers will provide free upgrade service. Before you decide to purchase a network camera, you must consider the cost of configuring an IP address for a large number of cameras and performing upgrade maintenance work. Manufacturers of network cameras should provide users with easy-to-use tools to effectively support the equipment maintenance process, and there should be a clear estimate of the cost and downtime caused by upgrading and maintaining the equipment. The device maintenance tool should also be able to automatically lock all network video devices in the network and monitor the working status of these devices so that users can monitor and maintain the devices.
(6) Network performance and security features <br> In addition to image quality, network performance of network cameras is another very important feature. With its own IP address, you can directly access the Ethernet. These are just some of the most basic functions of the network camera, and all the network cameras on the market have it. But in order to choose a good network camera, you also need to consider other factors, such as:
1 Does it support DHCP (Dynamic Host Configuration Protocol)? 2 Does it support data encryption transmission? For example, the most commonly used HTTPS protocol? In addition, the company's IT department's attitude towards the product is also a very effective touchstone. Are they willing to deploy this network camera to the company's network? Most of the IT staff are experts in network technology, and they know that network cameras have enough network and security features.
(7) Image sensor <br> Image sensor is one of the most important components of a camera. From the scanning method, there are two kinds of image sensors on the market: interlaced scanning and progressive scanning. In fact, only webcam can implement progressive scan, but not all webcams have this feature. Progressive scanning means exposing and capturing a complete image at the same time, while the interlaced scanning technique used in analog cameras scans only half of the image at a time, and scans the other half after 17 milliseconds. If an object in the picture is in motion, the analog camera uses interlaced scanning technology, so the images it acquires usually have obvious smear, flicker and blur, while the progressive scan does not appear similar. The phenomenon. In video surveillance applications, it is critical to be able to clearly image a moving object, which allows the user to see the detailed features of the moving object, such as the facial features of a perpetrator. Please think carefully, when you press "Pause" during DVD viewing, why is the picture much clearer than when using a VCR? That is the result of a progressive scan.
(8) Manufacturer's Background <br> As discussed above, when selecting a network camera, it is necessary to make a decision based on the prediction of the increase in the number of network cameras in the system and the need for new features of the network camera. This means that the network camera manufacturer you choose will be a long-term partner.
The product data sheet may contain partial answers to the above questions, but be sure to perform a field test on the camera to ensure that the product characteristics described in the data sheet truly meet the needs of your application.
(2) Product Lines <br> Network cameras have many more functions than analog cameras, such as built-in image compression, motion detection, network connection and transmission, event and alarm management, and more. When the system needs to be expanded, you usually want the extended system to have the same or even more features than before. The best way to achieve this goal is to select a small number of product suppliers and maintain long-term cooperation. When selecting a supplier, you should select those manufacturers with a full product line. Their product line should include at least a fixed camera, a fixed dome camera, and a full range of PTZ cameras. In this case, one or two vendors can fully meet your current and future application needs, and you can easily upgrade to megapixel resolution, add wireless transmission capabilities or audio support to your system. If your existing system includes analog cameras and needs to be integrated into a digital system, select those products that also include video servers (encoders), video decoders, protective covers, and other related accessories.
(3) Product integration and back-end application software support <br> You are considering whether the purchased network camera is in a closed system, so that you have little choice for the back-end application software, even a set of video Management software to choose from? You know, the security industry is not just moving closer to network cameras, but more importantly it is transforming into open systems and hardware platforms. Therefore, the network cameras produced by excellent manufacturers must also conform to industry standards, have an open programmable interface (API), have strong integration, and can definitely provide a broad space for your back-end software selection. Some leading companies even have hundreds of partners around the world, providing users with hundreds of back-end management software to choose from. In the long run, open, multi-vendor systems will always dominate the market.
(4) Image compression format MJPEG and MPEG-4 are two image compression formats commonly used in network video surveillance. Both have advantages in image quality and bandwidth occupancy. Therefore, an excellent network camera should support both compressions at the same time. The format allows the user to select the appropriate format to optimize image quality and bandwidth resources based on the actual environment of the application. More importantly, excellent network cameras should perform image compression 100% in accordance with MJPEG and MPEG-4 international standards. When you find that companies that claim that their products meet certain criteria do not actually comply with the standard 100%, it is inevitable that 99% of the compliance is actually equal to non-conformance. Full compliance with international standards ensures that you can use video streams from different applications, as well as ensuring that you can still view the images you are recording after 10 years. Conversely, if a camera uses a company's proprietary compression technology, once the company exits the market, the end user's interests are inevitably lost.
(5) Device configuration and management tools <br> Like other intelligent network devices, network cameras have their own independent IP address and built-in firmware (Firmware), many manufacturers will provide free upgrade service. Before you decide to purchase a network camera, you must consider the cost of configuring an IP address for a large number of cameras and performing upgrade maintenance work. Manufacturers of network cameras should provide users with easy-to-use tools to effectively support the equipment maintenance process, and there should be a clear estimate of the cost and downtime caused by upgrading and maintaining the equipment. The device maintenance tool should also be able to automatically lock all network video devices in the network and monitor the working status of these devices so that users can monitor and maintain the devices.
(6) Network performance and security features <br> In addition to image quality, network performance of network cameras is another very important feature. With its own IP address, you can directly access the Ethernet. These are just some of the most basic functions of the network camera, and all the network cameras on the market have it. But in order to choose a good network camera, you also need to consider other factors, such as:
1 Does it support DHCP (Dynamic Host Configuration Protocol)? 2 Does it support data encryption transmission? For example, the most commonly used HTTPS protocol? In addition, the company's IT department's attitude towards the product is also a very effective touchstone. Are they willing to deploy this network camera to the company's network? Most of the IT staff are experts in network technology, and they know that network cameras have enough network and security features.
(7) Image sensor <br> Image sensor is one of the most important components of a camera. From the scanning method, there are two kinds of image sensors on the market: interlaced scanning and progressive scanning. In fact, only webcam can implement progressive scan, but not all webcams have this feature. Progressive scanning means exposing and capturing a complete image at the same time, while the interlaced scanning technique used in analog cameras scans only half of the image at a time, and scans the other half after 17 milliseconds. If an object in the picture is in motion, the analog camera uses interlaced scanning technology, so the images it acquires usually have obvious smear, flicker and blur, while the progressive scan does not appear similar. The phenomenon. In video surveillance applications, it is critical to be able to clearly image a moving object, which allows the user to see the detailed features of the moving object, such as the facial features of a perpetrator. Please think carefully, when you press "Pause" during DVD viewing, why is the picture much clearer than when using a VCR? That is the result of a progressive scan.
(8) Manufacturer's Background <br> As discussed above, when selecting a network camera, it is necessary to make a decision based on the prediction of the increase in the number of network cameras in the system and the need for new features of the network camera. This means that the network camera manufacturer you choose will be a long-term partner.
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