[ Huaqiang Security Network News ] The surveillance images in many places now have shortcomings that are not clear enough. What causes this? Is there a way to change the quality of the surveillance image? Let me see for you to analyze.
The image size affects whether the management monitor can detect suspicious situations in time, and can clearly identify the suspect after the case occurs. Below we analyze several factors that affect image quality:
First, the chip <br> Here we mainly talk about the chip of the soft card, the current common soft-voltage DVR card on the market is mainly the United States CONEXANT company.
Developed CX25835 is very competitive, 8-in-1 ultra-low power consumption, low heat, true color reproduction, no color cast, fine and clear picture quality, and no outstanding advantages in price, it may become the mainstream chip of future DVR card in the future. At present, we have cooperated with domestic WAPA (wave particle) to develop a soft pressure D1 eight-in-one card, which will be a historic turning point in the global DVR board industry. This chip was originally made in Shenzhen Dongpu, but it has not been matched with good software and the price is very expensive. It is not accepted by the market. There is no price advantage in similar products, and now the new 6802C in the image quality is Prices are more advantageous than such cards;
PHILIPS' SAA7130 chip has a 9-bit high-definition picture quality, soft and warm color, and low noise. It has always been the mainstream chip for soft-press cards. Due to market reasons, the 7130 delisted, there are also product chip defects, and replaced by 7134, the same product chip input this piece is currently only in Shenzhen, the effect is not expected to be better! The compatibility and implementation of chips in the same industry is stronger than this chip, because the choice of chips is easier than before, so it is relatively free and unrestricted in the factory; thus SSA7134 will not become the mainstream product in the market at present;
TECHWELL has introduced TW6802, 6800, 6802B, and 6805 chips for soft-pressing cards since 2003. The biggest advantage of this card is that it can do non-frame-shifting acquisition when doing non-real-time DVR, and they are synchronized in audio and video. The effect is also better than other chips. At present, most of the acquisition cards for audio and video synchronization in soft cards are this chip. Such chips also solve the product full compatibility products, which is the reason why such chips can become mainstream. Some people say that compatibility is a software problem, and some people say that it is a hardware problem. In the end, there is no clear statement, but practice Can explain everything, the card with the best market compatibility is only this kind of chip;
In summary, the quality of the DVR and the chip of the capture card have a direct relationship, but the quality of the first-class capture card depends on the DVR software, DVR board design, especially the monitoring software, no matter how good the chip is not mature. The monitoring software matches, so its quality is also general.
As the major chip manufacturers not only enter the security field, their investment is constantly increasing, and the chip processing and image clearing ability is also getting better and better, so that before a chip is done all the way, now a chip to process Four or eight channels are more prominent in terms of effect and picture quality, including more advantages in chip processing, less speed and compression, and also lower hardware costs. Quality assurance and stability, this is also a sign of behavioral progress; those who have used the acquisition card know that the multi-chip is much higher than the single-chip maintenance rate; this piece of Henderson Security based on market research found ratios of 7% and 1 %. It is also the development of a mainstream product, which can reduce the cost of after-sales maintenance! This piece of Liheng Security is a relatively complete company, first proposed the first five-year warranty for video capture cards. It is conceivable that the product quality and confidence are very confident, and the direct support of the chip manufacturers is inseparable from the R&D team.
Second, the algorithm <br> In the DVR industry in the domestic market, commonly used algorithms are H.264, MPEG-4, wavelet algorithm, MJPEG, etc., but now according to the requirements of the project and various considerations, compression ratio, image clarity, The video takes up space, etc., in order to achieve a balance point, H.264 is adopted.
Third, the resolution <br> Resolution as the name suggests is to see the clarity of the object. There are two things we need to focus on: display resolution and video resolution. The resolution of the monitor is the resolution of the monitor you are monitoring. Although the resolution of the monitor can reach 1280*1024, most manufacturers' software does not support 1280*1024 HD resolution, but it is forced to squeeze or pull up and down. Stretching, the image looks distorted, the effect is not good, the current soft card software in the market can achieve HD, only one or two can do it. Video resolution mainly affects the quality of the image is determined by the algorithm. As long as you remember, the video resolution is proportional to the video capacity and image clarity. Now almost all manufacturers are recording every hour in CIF format. More than 230M, as far as I know, Zhonghengji's super-discharged third-generation software is only 150M in CIF format (unlimited stream), and D1 resolution recording capacity is about 4 times that of CIF.
Fourth, the code stream <br> Code stream is simply the amount of data in the image, the more data stored per second, the higher the clarity of the image, reducing the stream, that is, the details of the image are lost, image data Less, the footprint is small, but the image is not clear, the code stream and the image is also a proportional relationship. Therefore, controlling the code stream is also an important factor affecting image quality.
V. Several suggestions for obtaining clear images <br> First: buy a good brand of display, the quality of the display depends mainly on the panel used for the display. Currently, the monitors with good quality are PHILIPS, Samsung, ViewSonic, etc.
Second: Please try to buy ATI graphics card, because the quality of ATI graphics card is recognized as the best in the industry, the graphics card industry is better than rendering, line management, processing speed, 3D texture, etc., ATI graphics card may not be as good as other manufacturers in some aspects. However, the quality of the picture is much better than other brands of graphics cards in terms of color, exquisiteness, sharpness and color reproduction;
Third: set the video resolution and code stream high. If the above analysis video resolution is high, the image is clear, the code stream is high or the code stream is not limited, the image is clear. In addition, here is the code stream of the PTZ. Because the PTZ is rotating at the moment, the picture changes a lot, the amount of data is large, and the more the picture changes, the larger the amount of data. Under the same parameter setting (that is, the compression ratio of all channels is the same), the video file of the channel with the PTZ will be larger than the others. This is a normal phenomenon. If the video stream of this channel is forcibly restricted, the video playback will be blurred. Clear, so it is not recommended to do code stream restrictions on the gimbal.
The image size affects whether the management monitor can detect suspicious situations in time, and can clearly identify the suspect after the case occurs. Below we analyze several factors that affect image quality:
Developed CX25835 is very competitive, 8-in-1 ultra-low power consumption, low heat, true color reproduction, no color cast, fine and clear picture quality, and no outstanding advantages in price, it may become the mainstream chip of future DVR card in the future. At present, we have cooperated with domestic WAPA (wave particle) to develop a soft pressure D1 eight-in-one card, which will be a historic turning point in the global DVR board industry. This chip was originally made in Shenzhen Dongpu, but it has not been matched with good software and the price is very expensive. It is not accepted by the market. There is no price advantage in similar products, and now the new 6802C in the image quality is Prices are more advantageous than such cards;
PHILIPS' SAA7130 chip has a 9-bit high-definition picture quality, soft and warm color, and low noise. It has always been the mainstream chip for soft-press cards. Due to market reasons, the 7130 delisted, there are also product chip defects, and replaced by 7134, the same product chip input this piece is currently only in Shenzhen, the effect is not expected to be better! The compatibility and implementation of chips in the same industry is stronger than this chip, because the choice of chips is easier than before, so it is relatively free and unrestricted in the factory; thus SSA7134 will not become the mainstream product in the market at present;
TECHWELL has introduced TW6802, 6800, 6802B, and 6805 chips for soft-pressing cards since 2003. The biggest advantage of this card is that it can do non-frame-shifting acquisition when doing non-real-time DVR, and they are synchronized in audio and video. The effect is also better than other chips. At present, most of the acquisition cards for audio and video synchronization in soft cards are this chip. Such chips also solve the product full compatibility products, which is the reason why such chips can become mainstream. Some people say that compatibility is a software problem, and some people say that it is a hardware problem. In the end, there is no clear statement, but practice Can explain everything, the card with the best market compatibility is only this kind of chip;
In summary, the quality of the DVR and the chip of the capture card have a direct relationship, but the quality of the first-class capture card depends on the DVR software, DVR board design, especially the monitoring software, no matter how good the chip is not mature. The monitoring software matches, so its quality is also general.
As the major chip manufacturers not only enter the security field, their investment is constantly increasing, and the chip processing and image clearing ability is also getting better and better, so that before a chip is done all the way, now a chip to process Four or eight channels are more prominent in terms of effect and picture quality, including more advantages in chip processing, less speed and compression, and also lower hardware costs. Quality assurance and stability, this is also a sign of behavioral progress; those who have used the acquisition card know that the multi-chip is much higher than the single-chip maintenance rate; this piece of Henderson Security based on market research found ratios of 7% and 1 %. It is also the development of a mainstream product, which can reduce the cost of after-sales maintenance! This piece of Liheng Security is a relatively complete company, first proposed the first five-year warranty for video capture cards. It is conceivable that the product quality and confidence are very confident, and the direct support of the chip manufacturers is inseparable from the R&D team.
Second, the algorithm <br> In the DVR industry in the domestic market, commonly used algorithms are H.264, MPEG-4, wavelet algorithm, MJPEG, etc., but now according to the requirements of the project and various considerations, compression ratio, image clarity, The video takes up space, etc., in order to achieve a balance point, H.264 is adopted.
Third, the resolution <br> Resolution as the name suggests is to see the clarity of the object. There are two things we need to focus on: display resolution and video resolution. The resolution of the monitor is the resolution of the monitor you are monitoring. Although the resolution of the monitor can reach 1280*1024, most manufacturers' software does not support 1280*1024 HD resolution, but it is forced to squeeze or pull up and down. Stretching, the image looks distorted, the effect is not good, the current soft card software in the market can achieve HD, only one or two can do it. Video resolution mainly affects the quality of the image is determined by the algorithm. As long as you remember, the video resolution is proportional to the video capacity and image clarity. Now almost all manufacturers are recording every hour in CIF format. More than 230M, as far as I know, Zhonghengji's super-discharged third-generation software is only 150M in CIF format (unlimited stream), and D1 resolution recording capacity is about 4 times that of CIF.
Fourth, the code stream <br> Code stream is simply the amount of data in the image, the more data stored per second, the higher the clarity of the image, reducing the stream, that is, the details of the image are lost, image data Less, the footprint is small, but the image is not clear, the code stream and the image is also a proportional relationship. Therefore, controlling the code stream is also an important factor affecting image quality.
V. Several suggestions for obtaining clear images <br> First: buy a good brand of display, the quality of the display depends mainly on the panel used for the display. Currently, the monitors with good quality are PHILIPS, Samsung, ViewSonic, etc.
Second: Please try to buy ATI graphics card, because the quality of ATI graphics card is recognized as the best in the industry, the graphics card industry is better than rendering, line management, processing speed, 3D texture, etc., ATI graphics card may not be as good as other manufacturers in some aspects. However, the quality of the picture is much better than other brands of graphics cards in terms of color, exquisiteness, sharpness and color reproduction;
Third: set the video resolution and code stream high. If the above analysis video resolution is high, the image is clear, the code stream is high or the code stream is not limited, the image is clear. In addition, here is the code stream of the PTZ. Because the PTZ is rotating at the moment, the picture changes a lot, the amount of data is large, and the more the picture changes, the larger the amount of data. Under the same parameter setting (that is, the compression ratio of all channels is the same), the video file of the channel with the PTZ will be larger than the others. This is a normal phenomenon. If the video stream of this channel is forcibly restricted, the video playback will be blurred. Clear, so it is not recommended to do code stream restrictions on the gimbal.
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