[ Pacific Security Network News ]
When purchasing a camera, people have more and more requirements for the camera, not only requiring stable performance, but more importantly, requiring clarity. In fact, the most important function of a camera in the monitoring place is to let people see the facial features of the person. Everyone should consider the following points when selecting.
Key factor 1: image quality
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.
When assessing the image quality of a network camera, you must consider the following questions:
How many levels can its image clarity be divided into? Does it have a high quality lens? What is the image quality when there is a lot of motion in the picture? 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.
Key factor two: product line
Network cameras have more features than analog cameras, such as built-in image compression, motion detection, network connectivity 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.
Key factor three: product integration and back-end application software support
Are you considering whether the purchased network camera is in a closed system, so that you have little choice for the back-end application software, or 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. In the long run, open, multi-vendor systems will always dominate the market.
Key factor four: 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 be able to support two compression formats at the same time, so that users can Choose the appropriate format to optimize image quality and bandwidth resources based on the actual environment of your application. More importantly, excellent network cameras should perform image compression 100% in accordance with MJPEG and MPEG-4 international standards. If a camera uses a company's proprietary compression technology, once the company exits the market, the interests of the end user will inevitably suffer. In addition, if a company claims that its products support the MPEG-4 compression format, be sure to pay attention to the license fee (LicenseFee) issue.
Key factor five: device configuration and management tools
Like other smart network devices, network cameras have their own independent IP address and built-in firmware (Firm-ware), many manufacturers will provide a 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.
Key factor six: network performance and security features
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: Does it support DHCP (Dynamic Host Configuration Protocol)? Be aware that many companies use this protocol to maintain internal IP addresses. 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.
Key factor seven: image sensor
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. 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.
Key factor eight: Power over Ethernet (PoE)
The PoE feature seems to be just a common option in the list of webcam features, but please think again: Are you willing to save another $300 on each camera? The $300 is about the cost of wiring and powering a camera. Even for small to medium-sized systems with only 50 to 100 cameras, the investment required to power them is not a small expense, but for a need. For end users who install hundreds of cameras, this means a considerable amount of money. With a network camera that supports PoE, these costs can be saved and used elsewhere. It should be noted that when selecting cameras that support PoE, it is important to ensure that they comply with the IEEE802.3af standard. This way you can freely choose from many well-known network equipment vendors (such as Cisco, Nortel, NetGear, etc.) to support PoE-enabled network switching equipment. In addition, the PoE function allows your video surveillance system, including the camera, to get working power from the network server room and use UPS (uninterruptible power supply) so that your monitoring system can still be normal even in the event of a power outage. jobs.
Key factor nine: distributed intelligence
In North America and other developed regions of the world, "smart video" has become a very popular term. In the next few years, intelligent video technology will be greatly developed and improved, but only when intelligent factors are deployed in front-end network cameras, intelligent video systems can truly flexibly expand. The reason is obvious: Intelligent video processing requires hardware devices with considerable data processing capabilities. If the video processing is not resident in the camera, only a few cameras are enough to overload the PC server. When the smart factor resides in an edge device such as a camera, the camera itself can pre-process the video data and decide when to send data to the backend device.
Key Factor 10: Manufacturer Background
As discussed above, when choosing a network camera, it is important 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, which means that the network camera manufacturer you choose Will be a long-term partner. It can be seen that it is also very important to choose a reliable network camera manufacturer.
Therefore, if you want to buy a good million HD camera and refer to the above ten features, I believe it will be solved for you.
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Concertina Barbed Wire, also known as Razor Wire, is a type of barbed wire that is formed in large coils which can be expanded like a concertina. It is designed with sharp edges or points arranged at intervals along the strand(s). This type of wire is used to form barriers or fences for security purposes, often used in military or prison settings.
The concertina design allows the wire to be compacted during storage and transport, and then expanded and installed with ease. It is highly effective as a deterrent and physical barrier due to its sharp blades which can cause serious injury to those trying to cross it. It is often used in combination with other types of fencing to create a high level of security.
Concertina wire is a type of barbed wire or razor wire that is formed in large coils which can be expanded like a concertina. It is used to form military-style wire obstacles.
1. Concertina Barbed Wire: This is a type of barbed wire that is coiled and can be expanded like a concertina. It is designed to create an obstacle that is difficult to overcome. It is often used in military settings or for high-security areas.
2. Concertina Razor Wire: This is similar to barbed wire but has razor-sharp blades instead of barbs. It is designed to cause serious harm to anyone trying to climb over or through it.
3. Concertina Wire Fencing: This is a type of fencing that uses concertina wire. It is often used for security purposes, particularly in prisons, military bases, and other high-risk areas.
4. Concertina Wire: This is a general term that can refer to either concertina barbed wire or concertina razor wire. It is named for its ability to be expanded and contracted like a concertina, which makes it easy to transport and install.
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