The most important function of the DVR is to play back historical video. The playback quality is one of the most important performance indicators of the DVR. The clarity of the image quality and the size of the image affect whether or not the supervisory personnel can detect the suspicious situation in time, which is crucial to the case. effect. So, what are the major factors that affect the quality of DVR surveillance images?
DVR chip
The common chips on the pre-market soft voltage DVR cards are FUSION878A, CX23811, CX25851 from CONEXANT, SAA7130, SAA7134 from PHILIPS, and TW6800, TW6802, TW6802B, and TW6805 from TECHWELL in the United States.
DVR quality and capture card chip has a direct relationship, but the quality of the first-class capture card also depends on DVR software, DVR circuit board design, especially monitoring software, no matter how good the chip does not match the mature monitoring software, then Its quality is also general.
With major chip manufacturers not only entering the field of security, their investment is constantly increasing. The ability to handle the chips and the clarity of the images is also getting better and better, so that before a chip to do all the way to deal with, now a chip to deal with Four-way or eight-way, more prominent in the effect and picture quality, including more advantages in the chip processing, less busy in the speed and compression, but also reduce the hardware costs, but also get better Quality assurance and stability, which is also a sign of behavioral progress; people who have used a capture card know that the maintenance rate of multi-chips is much higher than that of single-chip chips; in which Henderson Security ranked 7% and 1 according to market research findings. %. It is also the development of a mainstream product that can reduce after-sales maintenance and reduce costs! This piece of Zhonghengheng security is a relatively perfect company, first put forward the first five-year video capture card warranty.
It can be imagined that the product quality and confidence is very confident, but also have the direct support of chip manufacturers and with the R & D team is inseparable.
DVR algorithm, resolution and stream algorithm
In the DVR industry in the domestic market, the commonly used algorithms are H.264, MPEG-4, wavelet algorithm, MJPEG, etc., but now according to the requirements of the project and considerations of various aspects, the compression rate, image clarity, and the space occupied by the video, etc. H.264 is used to reach a balance point.
Resolution
The definition by definition is to see the clarity of the object. We need to pay attention to two: monitor resolution and video resolution. The monitor resolution is the resolution of the monitor you watch. Although the resolution of the monitor can reach 1280*1024, the software of most manufacturers does not support the 1280*1024 high-definition resolution, but it is forced to squeeze or pull up or down. Extensive, the image appears to be distorted, and the effect is not good. At present, there are only one or two companies that can achieve high-definition software software in the market. The video resolution mainly affects the quality of the image is determined by the algorithm, as long as you remember, the video resolution and the video capacity, image resolution is proportional to it, and now almost all manufacturers in the CIF format video every hour Above 230M, according to my understanding, Henderson's three-generation software is only 150M in CIF format (no limit stream), and D1 resolution recording capacity is about 4 times that of CIF.
Stream
The stream of code is simply the amount of data in the image. The more data stored per second, the higher the definition of the image and the reduction of the code stream. That is, some of the details in the image are lost. The image data is less, and the space is also occupied. It is small, but the image is not clear, and the stream and the image are also in a direct relationship. Therefore, controlling the code stream is also an important factor that affects the image quality.
Several suggestions for getting a clear image
First: buy a good brand of display, the display's image quality depends mainly on the display of the panel used, the current good quality display PHILIPS, Samsung, ViewSonic, etc.;
Second: Please try to buy ATI graphics cards, because the quality of ATI graphics cards is recognized as the best in the industry, graphics industry is in the rendering, line management, processing speed, 3D textures, etc., ATI graphics may be inferior to other manufacturers in some aspects , but in terms of picture quality, it is much better than the graphics cards of other brands from the aspects of colorfulness, fineness, sharpness, and color reproduction;
Third: Set the video resolution and stream height. For example, if the video resolution is high, the picture is clear, the stream is high or the stream is not limited, the picture will be clear. In addition, the stream of PTZ is mentioned here. Because PTZ is rotating at a time, the picture changes greatly, and the amount of data is large. The more the picture changes, the larger the amount of data. Under the same parameter settings (that is, all channels have the same compression ratio), the video files of the PTZ channel will be larger than others. This is a normal phenomenon. If the video stream of this channel is forcibly restricted, the video playback is not vague. Clear, so it is not recommended to do stream restrictions on PTZ.
DVR chip
The common chips on the pre-market soft voltage DVR cards are FUSION878A, CX23811, CX25851 from CONEXANT, SAA7130, SAA7134 from PHILIPS, and TW6800, TW6802, TW6802B, and TW6805 from TECHWELL in the United States.
DVR quality and capture card chip has a direct relationship, but the quality of the first-class capture card also depends on DVR software, DVR circuit board design, especially monitoring software, no matter how good the chip does not match the mature monitoring software, then Its quality is also general.
With major chip manufacturers not only entering the field of security, their investment is constantly increasing. The ability to handle the chips and the clarity of the images is also getting better and better, so that before a chip to do all the way to deal with, now a chip to deal with Four-way or eight-way, more prominent in the effect and picture quality, including more advantages in the chip processing, less busy in the speed and compression, but also reduce the hardware costs, but also get better Quality assurance and stability, which is also a sign of behavioral progress; people who have used a capture card know that the maintenance rate of multi-chips is much higher than that of single-chip chips; in which Henderson Security ranked 7% and 1 according to market research findings. %. It is also the development of a mainstream product that can reduce after-sales maintenance and reduce costs! This piece of Zhonghengheng security is a relatively perfect company, first put forward the first five-year video capture card warranty.
It can be imagined that the product quality and confidence is very confident, but also have the direct support of chip manufacturers and with the R & D team is inseparable.
DVR algorithm, resolution and stream algorithm
In the DVR industry in the domestic market, the commonly used algorithms are H.264, MPEG-4, wavelet algorithm, MJPEG, etc., but now according to the requirements of the project and considerations of various aspects, the compression rate, image clarity, and the space occupied by the video, etc. H.264 is used to reach a balance point.
Resolution
The definition by definition is to see the clarity of the object. We need to pay attention to two: monitor resolution and video resolution. The monitor resolution is the resolution of the monitor you watch. Although the resolution of the monitor can reach 1280*1024, the software of most manufacturers does not support the 1280*1024 high-definition resolution, but it is forced to squeeze or pull up or down. Extensive, the image appears to be distorted, and the effect is not good. At present, there are only one or two companies that can achieve high-definition software software in the market. The video resolution mainly affects the quality of the image is determined by the algorithm, as long as you remember, the video resolution and the video capacity, image resolution is proportional to it, and now almost all manufacturers in the CIF format video every hour Above 230M, according to my understanding, Henderson's three-generation software is only 150M in CIF format (no limit stream), and D1 resolution recording capacity is about 4 times that of CIF.
Stream
The stream of code is simply the amount of data in the image. The more data stored per second, the higher the definition of the image and the reduction of the code stream. That is, some of the details in the image are lost. The image data is less, and the space is also occupied. It is small, but the image is not clear, and the stream and the image are also in a direct relationship. Therefore, controlling the code stream is also an important factor that affects the image quality.
Several suggestions for getting a clear image
First: buy a good brand of display, the display's image quality depends mainly on the display of the panel used, the current good quality display PHILIPS, Samsung, ViewSonic, etc.;
Second: Please try to buy ATI graphics cards, because the quality of ATI graphics cards is recognized as the best in the industry, graphics industry is in the rendering, line management, processing speed, 3D textures, etc., ATI graphics may be inferior to other manufacturers in some aspects , but in terms of picture quality, it is much better than the graphics cards of other brands from the aspects of colorfulness, fineness, sharpness, and color reproduction;
Third: Set the video resolution and stream height. For example, if the video resolution is high, the picture is clear, the stream is high or the stream is not limited, the picture will be clear. In addition, the stream of PTZ is mentioned here. Because PTZ is rotating at a time, the picture changes greatly, and the amount of data is large. The more the picture changes, the larger the amount of data. Under the same parameter settings (that is, all channels have the same compression ratio), the video files of the PTZ channel will be larger than others. This is a normal phenomenon. If the video stream of this channel is forcibly restricted, the video playback is not vague. Clear, so it is not recommended to do stream restrictions on PTZ.
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