Differentiate the advantages and disadvantages of DVR from four aspects

[ Huaqiang Security Network News ] To distinguish the advantages and disadvantages of digital video recorders (dvr), you can judge from the performance of video recording speed, storage capacity, picture clarity, and operation methods. However, in comparison with these points, there are many misunderstandings in the market. Many users blindly pursue speed, large capacity, and high definition, but I don't know that these three indexes are mutually restrictive. It is impossible to achieve the best of the three conditions. The operation method is simple and easy to use, and it is often used by most engineers. The company's equipment selection staff ignored it until it was discovered during the installation process, which wasted a lot of time.
1. Recording speed <br> In terms of recording speed, in fact, all dvrs are 30 pictures/second or 60 fields/second (ntsc format) in real time. Any advertisement beyond this index is unrealistic. If 16 channels of images are recorded at the same time, each channel has only 30/16 frames per second or 60/16 fields per second. When recording multiple channels, some dvrs use the leading image displacement test method to greatly increase the recording rate, moving image recording. The speed is virtually real-time, many times faster than a video recorder without image shift detection. However, it should be noted that the image displacement test recording refers to the full-screen compression recording of the full-screen image shift camera, rather than just compressing and recording the image shifting activity in each camera image. The latter can optimize the recording rate, but in European and American law. This kind of image will not be used as evidence.
2. Storage capacity and backup <br> The larger the recording capacity, the better, but the most important thing is to have an interface to connect external digital storage devices, to back up image data, and only have regular backups to ensure that valuable images can be safe. Save it and make it easy to output. It is unwise to have a few months of images on the internal hard drive of the machine. Once the machine is damaged, all the data will be completely lost.
3. Image sharpness <br> The image clarity directly reflects the dvr quality, but from the technical information principle knowledge, the higher the definition, the larger the storage capacity, which allows the user to adjust the clarity according to the actual situation. The degree is the best design, and almost all the products have been done.
4. The operation method is simple and not <br> The operation method is simple and easy to determine the adaptability of the product in actual use. More and more users hope that they can use the device to end all functions by one button. Many manufacturers ignore the user. Using the overall quality of electrical equipment, the product design scheme has many functions, the operation method is too complicated, and the result is difficult to be issued. In order to improve this deficiency, many manufacturers are constantly upgrading their products, such as using a humanized keyboard, simplifying the use of daily operation methods, or increasing the computer network interface function, and adapting to the development trend of the network, etc., to expand the market share in the international market.

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