Ten security tips to help you choose the right DVR

After the initial selection of a manufacturer that meets the requirements, we will conduct a preliminary selection based on the product introduction provided by the manufacturer. Of course, users and engineering companies should choose products that suit their needs according to their own needs. This is a pragmatic choice. If you choose a feature-rich embedded DVR, but these functions are not used in the project at all, it will undoubtedly cause a cost increase. Therefore, it is important to pay attention to the following points:

1. The clarity of the image

Image clarity is a controversial topic. Every user hopes that the image of the purchased product is the clearest, but technically, the higher the clarity, the more disk storage space is occupied and the network transmission is required. The higher the bandwidth. Therefore, it is the best design that allows users to adjust the level of clarity according to the actual situation. Therefore, according to the actual situation of the (project), the user chooses the product that is suitable for the user, which is the rational approach of the engineering business.

At present, the resolution of the CIF format on the market is still the mainstream resolution, but some manufacturers have developed multi-channel full D1 embedded DVR, and the resolution is also very high, but requires a very high bit rate. At present, the dual-stream technology is highly respected in the market. D1 resolution is used for video recording, and CIF resolution is used for network transmission, which solves the problems of recording quality and bandwidth limitation during network transmission.

2. Real-time image

At present, the real-time nature of images is a topic of great controversy in the industry. One common feature of Chinese DVR products in publicity is that no matter how many routes, all real-time functions can be achieved through publicity. In fact, when choosing a DVR, what you have to consider is whether this DVR product can really achieve full real time? Or is it really necessary to achieve full real time? In terms of recording rate, in fact, all DVRs are in real time 25 pictures / second (PAL format) or 50 picture fields / second (PAL format), any advertising that exceeds this index is unrealistic. It should also be noted that to observe the real-time nature of the motion picture, observe whether there is delay and smear, and observe the highest bit rate.

3. Compression algorithm

At present, the image compression algorithms used in embedded DVR are mainly MJPEG, MPEG-4, H.264, etc. These algorithms have their own advantages and disadvantages. If you want to achieve full real-time, high-definition, extremely low mosaic, highly smooth and smooth image quality, you must sacrifice hard disk storage space and network bandwidth. Therefore, it is the wish of every engineering company to choose a product that not only meets the image quality of customer needs, but also saves the storage space of the hard disk, and at the same time can guarantee the real-time transmission of the compression algorithm on the low bandwidth network. Judging from the current technology, H.264 compression algorithm has a higher compression rate than MPEG-4 on the premise of satisfying higher image quality, and its technical characteristics are more suitable for IP network and wireless network transmission. At present, the H.264 compression algorithm has not really achieved a high compression ratio, and there is still a certain gap with the real H.264 algorithm, but it is currently the most ideal compression algorithm.

4. Network function

Under the impact of digital surveillance, users have an urgent need for DVR network functions. Therefore, the network function of DVR is also a factor that must be considered when purchasing. In a large-scale monitoring platform, a large number of cameras and DVRs are arranged on the front end, so it is very important whether the equipment can be remotely controlled through the central monitoring and management system. Therefore, we must not only look at whether the product provides an Ethernet network interface, but also to see if it provides supporting centralized monitoring and management system software to truly control the DVR through the network.

5. Alarm linkage

The DVR must have an alarm and linkage interface, as well as related records of events, such as machine location, date, time, user address, name, telephone, unit name, alarm category, etc. Once transmitted to the center, due to the control system The transfer time function relationship requires that the data for a period of time before receiving the alarm signal should be retained to facilitate the analysis of the process when collecting evidence in the future. There are also products that support SMS alarms. The principle is that when the monitoring device detects an abnormal situation, the SMS sending device is immediately activated to send the alarm information to the preset mobile phone in real time, so that the user can handle the abnormal situation in time.

6. Storage and backup

The larger the recording capacity, the better, but the most important thing is to have an interface connected to an external digital storage device for image data backup; only frequent backups can ensure that valuable images are safely saved and convenient for transmission . It is unwise to store several months of images on the built-in hard disk of the machine. Once the machine is damaged, all data will be completely lost.

In addition to regular backups, network backup is also a viable backup method. Therefore, the contractor should pay attention to the storage and backup performance of DVR equipment when purchasing.

7. Operational convenience

What is the convenience of operation? To put it bluntly is whether the feeling of using the device is easy and simple. Therefore, you must experience it yourself when purchasing. One is to pay attention to whether the key design and layout on the front panel of the DVR device are clear, and whether the label of each key is clear. The second depends on whether the software menu is intuitive and friendly, and whether it is convenient for users to set and browse. The third depends on whether the embedded DVR supports multiple operation methods such as mouse and remote control. An embedded DVR that is very convenient to operate can also explain to a certain extent that the company has accumulated rich engineering practical experience, for the sake of users, it does not make cars behind closed doors. According to the survey, almost all engineering companies hope that the operation interface and system can be more and more simple.

8. Reliability and security of recording

The operating platform used by the system is directly related to the design level of the application software used by the system. The current DVR is actually mainly based on computer and digital technology, so the more mature fault-tolerant technologies in various computer fields can be easily applied to the system, so that the reliability of surveillance video information is more guaranteed.

9. Convenience of video retrieval

For a long-running embedded DVR, the video file is very large, especially under different algorithms, the size of the video file in the same time period is different. Therefore, when it is necessary to search for related videos for analysis after the event occurs, if there is no convenient and fast video retrieval method, it is very difficult to search. Therefore, before purchasing a product, please understand whether the product has a convenient video retrieval method, and experience it by yourself.

10. Product cost performance

No matter how advanced the product's functional technology is, the price of the product is often taken into consideration first. In the case of meeting the needs of Party A's project, choose products with more price advantages as much as possible. For example, Party A has 24 cameras in a certain area. If the cost price of choosing a 16-channel embedded DVR plus an 8-channel embedded DVR is higher than that of choosing a 24-channel embedded DVR, you should definitely choose By. According to the survey, currently 58% of engineering companies and direct users believe that China's DVR products are the most cost-effective, followed by Korean products.