In the current standard evaluation system, the definition indicators are divided into two categories. One is the standard definition SD series, and the other is the CIF series. The better is the D1 image. There are also some standards that we ourselves engage in in the middle.
Now whether it is a television system or a video surveillance system, the transition is from standard definition to high resolution HDTV. The current HD system has a very high resolution, with the HD720, 1.2 Mega, and 3 Mega, with a horizontal resolution of 1300 to 2000 pixels. What are the benefits of HDTV? It's just a picture taken down. The light is not very good. After you deal with it by computer, you can make it better and clearer. Not long ago, it was demonstrated in Beijing that a British camera is more than 10 million pixels. It can be zoomed in by a continuous mouse click, from a very blurry image, and finally you can see your license plate and see a person's characteristics. Of course, it is still possible to use it in our country for a while. However, the development of high-definition is inevitable in the future.
Because it involves the digitization of images, compression techniques must be adopted. Of course the most popular are H.264 and MPEG4. In particular, the required bandwidth and required storage capacity of H.264 are better than MPEG4, which is the mainstream of future development.
Image transmission bandwidth requirements. A bandwidth of 1 to 2 M is generally required for the definition of the standard format. I have seen the 384K ADSL transmission images also look past. According to the general standard bandwidth is 1 to 2M. If it is the bandwidth of high-definition images, the requirements are much higher. Just like the British machine was made of 1.5-inch chips, so its clarity is very high, and its bandwidth sometimes needs 3MB, 5MB, 12MB. The image requires a large amount of storage capacity. An ordinary camera can generate 5.5 gigabytes of data each day, and 22 to 44 gigabytes if it is HD. This is too large for any disk capacity. If you have thousands of units, it's a huge amount. This kind of mass storage needs corresponding storage devices. At present, it is mainly a hard disk. The main network video recorders NVR, as well as disk arrays, disk arrays can be used dozens, you can also use network external storage, network virtual storage technology.
The wide dynamic range of the camera is very important. If there is a bright part of the picture and there is a dark piece, how can you evenly achieve this effect? There is a dynamic range here. If this camera has a wide dynamic range, then it can get a better image.
The hardware is very good. If our software doesn't keep up, we only do half of it and we don't complete our tasks. So we need a good video analytics package. This video analysis software package is very difficult, but this is the inevitable way to go in the future, including mobile detection, biometric identification, human behavior analysis and event detection. For example, for mobile detection, I used to go to the Hunan Provincial Museum in Mawangdui. A beauty called Xinchao is usually placed in the underground coffin. During the exhibition, I went up to the exhibition room to use a row of three shifts. On duty. If you use two cameras for motion detection, as soon as the crystal coffin is moved by one millimeter, an alarm will be given immediately. This problem can be solved.
There is also human behavior analysis, and now our domestic “psoriasis†and the problem of posting small advertisements cannot be solved. Can we use the camera system to solve it? Because you must stick a small ad like to bend down the kind of action? So this behavioral analysis is very important. If such software assistance is available, it can play a significant role.
Another point is to provide dynamic detection and event detection at the front end of the system. For example, if someone intentionally leaves a packet in the subway, you do not know whether the inside is an explosive or not. This is particularly dangerous if you want to exclude it. Can we detect such problems through our previous cameras? That's very useful. This is actually the internal control of the VCA (Variable Complexity Algorithm) in the network camera or decoder, enabling dynamic detection. If the camera itself can solve this problem, it can play a very good role.
Now whether it is a television system or a video surveillance system, the transition is from standard definition to high resolution HDTV. The current HD system has a very high resolution, with the HD720, 1.2 Mega, and 3 Mega, with a horizontal resolution of 1300 to 2000 pixels. What are the benefits of HDTV? It's just a picture taken down. The light is not very good. After you deal with it by computer, you can make it better and clearer. Not long ago, it was demonstrated in Beijing that a British camera is more than 10 million pixels. It can be zoomed in by a continuous mouse click, from a very blurry image, and finally you can see your license plate and see a person's characteristics. Of course, it is still possible to use it in our country for a while. However, the development of high-definition is inevitable in the future.
Because it involves the digitization of images, compression techniques must be adopted. Of course the most popular are H.264 and MPEG4. In particular, the required bandwidth and required storage capacity of H.264 are better than MPEG4, which is the mainstream of future development.
Image transmission bandwidth requirements. A bandwidth of 1 to 2 M is generally required for the definition of the standard format. I have seen the 384K ADSL transmission images also look past. According to the general standard bandwidth is 1 to 2M. If it is the bandwidth of high-definition images, the requirements are much higher. Just like the British machine was made of 1.5-inch chips, so its clarity is very high, and its bandwidth sometimes needs 3MB, 5MB, 12MB. The image requires a large amount of storage capacity. An ordinary camera can generate 5.5 gigabytes of data each day, and 22 to 44 gigabytes if it is HD. This is too large for any disk capacity. If you have thousands of units, it's a huge amount. This kind of mass storage needs corresponding storage devices. At present, it is mainly a hard disk. The main network video recorders NVR, as well as disk arrays, disk arrays can be used dozens, you can also use network external storage, network virtual storage technology.
The wide dynamic range of the camera is very important. If there is a bright part of the picture and there is a dark piece, how can you evenly achieve this effect? There is a dynamic range here. If this camera has a wide dynamic range, then it can get a better image.
The hardware is very good. If our software doesn't keep up, we only do half of it and we don't complete our tasks. So we need a good video analytics package. This video analysis software package is very difficult, but this is the inevitable way to go in the future, including mobile detection, biometric identification, human behavior analysis and event detection. For example, for mobile detection, I used to go to the Hunan Provincial Museum in Mawangdui. A beauty called Xinchao is usually placed in the underground coffin. During the exhibition, I went up to the exhibition room to use a row of three shifts. On duty. If you use two cameras for motion detection, as soon as the crystal coffin is moved by one millimeter, an alarm will be given immediately. This problem can be solved.
There is also human behavior analysis, and now our domestic “psoriasis†and the problem of posting small advertisements cannot be solved. Can we use the camera system to solve it? Because you must stick a small ad like to bend down the kind of action? So this behavioral analysis is very important. If such software assistance is available, it can play a significant role.
Another point is to provide dynamic detection and event detection at the front end of the system. For example, if someone intentionally leaves a packet in the subway, you do not know whether the inside is an explosive or not. This is particularly dangerous if you want to exclude it. Can we detect such problems through our previous cameras? That's very useful. This is actually the internal control of the VCA (Variable Complexity Algorithm) in the network camera or decoder, enabling dynamic detection. If the camera itself can solve this problem, it can play a very good role.
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