Security Literacy: How to choose civilian control PC-DVR Cards?
First, identify the control DVR video capture card
The field of security (video capture card), various array of DVR cards, so a lot of work and consumers, especially the newly recruited entrants can not start, you are nothing more than the purpose of acquisition card purchase is more convenient and more effective the monitor, you should need to look at several major areas: software compression or hardware compression is good, what kind of card is the best picture quality, can achieve long-range features, easy backup what, how about after-sales service and other related issues. Here we will be all kinds of DVR Cards and the advantages and disadvantages by the line of distinction between understanding and knowledge acquisition card purchase.
Second, monitoring the quality of images
DVR playback of the most important feature is the history of the video, DVR playback quality is one of the most important performance indicators, the clarity of image quality, image size and impact management personnel are monitoring the situation in time suspicious, and after the case is clear identify the suspect, here we talk about several factors that affect image quality:
1, the chip: DVR capture card and the picture quality is directly related to the chip, but the best quality also depends on the capture card software, DVR, DVR board design, in particular, monitoring software, better monitoring of the chip is not mature software to match, then its quality is also a general.
2, the algorithm: DVR industry on the domestic market, commonly used algorithms are H.264, MPEG-4, Wavelet Algorithm, MJPEG, etc., but now according to various aspects of the project requirements and considerations, the compression ratio, image resolution, video takes space, in order to achieve a balance have adopted the H.264.
3, stream: stream is simply the amount of image data, the amount of data per second, more storage, the higher the image resolution to reduce the stream, that is, the image lost some detail, the image data is less , and also a small space, but the image is not clear, and image stream is also a proportional relationship. Therefore control the stream of image quality is also an important factor
4, resolution: resolution of the name suggests is to see the object definition. We need to focus on two: the display resolution and video resolution. Monitor resolution is your monitor resolution monitor, although it can reach a resolution of the monitor 1280 * 1024, but most of the manufacturers of the software does not support HD resolution of 1280 * 1024
Third, get a clear image of a few suggestions:
First: Try to buy ATI graphics cards, ATI graphics card because HD is the industry recognized best in the graphics industry than the rendering, line pipe, processing speed, 3D textures, and so, ATI graphics card in some other manufacturers may not be as , but the picture quality from the colorful, delicate, sharpness, color reproduction than other brands that have much better graphics card;
Second: to buy a good brand of display, the display image quality results depending on the display panel used in the current display has a good quality PHILIPS, SAMSUNG, ViewSonic, etc.;
Third: the video stream resolution and set high, such as the above analysis of video, high resolution, image clarity, high or open stream stream the image to clear. Also mention the head of this stream, because the moment of the rotating head, the picture changes and more data on the large screen changes the more the greater the amount of data. Under the same parameters (compression ratio is the same for all channels), a head of the channel’s video files are larger than others, this is normal, if the mandatory restrictions this channel video stream, then the video playback on the blurred clear, so I do not recommend restrictions on the stream head to do.
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