With the gradual improvement of people's monitoring requirements, network cameras have begun to develop in the direction of high-definition and intelligence. This article mainly discusses the development trend of network cameras in the field of technology in the next few years.
1, high-resolution into the most basic appeal in the analog monitoring era, the user of the fuzzy, snow-filled noise of the picture has long been a bitter but not at all, because at the time the best camera on the market can only do D1, pixels in theory At most, there are only more than 400,000. In the non-security field, it is overwhelmingly digital cameras, video cameras, computer cameras, and mobile phone cameras, which are often millions or even tens of millions of pixels. Surveillance cameras are the largest assistants in security and analog surveillance products can no longer meet the needs of users. Therefore, "HD" has become the largest demand, and with high-definition picture quality, low illumination, wide dynamic, intelligent, etc. Only higher-level demands can be realized before they have application value.
High-definition screens mainly rely on technological breakthroughs, starting with improving the quality of video sources. The digital network camera adopts progressive scanning relative to the analog camera. Commonly used CMOS sensors have built-in AD conversion, optical signal input, and digital signal output, avoiding repeated AD conversion, low image quality, and in color reproduction and signal Anti-interference performance is excellent.
The front sensor of the analog camera outputs an analog signal, which is then converted into a digital signal for color and brightness processing. The digital signal is then converted into an analog signal output. When reaching the back-end equipment such as DVR, the video acquisition chip (eg: 7130, 6805) converts the analog signal into a digital signal, and a total of 3 times of AD conversion occurs. The screen is seriously damaged when the composite video is transmitted to the video acquisition chip. When the video capture chip performs AD conversion, it also needs to perform bright color separation (comb filter). This makes it difficult to completely separate the brightness and color signals, resulting in the appearance of color penetration and variability in traditional analog video surveillance.
2. Intelligently improving monitoring efficiency Traditional monitoring is defensive monitoring. There is a lack of interaction between people and machines. The emergence of intelligent monitoring has changed the status quo, turning passive into initiative, and using intelligent technology to timely and automatically source the original video. The information extracts a large amount of useful information, completes the transmission, preservation and retrieval of the video, and can also drive Other programs to run other intelligent actions. Its advantage is very obvious: all-weather reliable monitoring, improve alarm accuracy, fast response.
Intelligent monitoring can identify behaviors and types from complex data analysis and provide operational commands, data, and information to realize intelligent behaviors such as alarms, reminder attention, and intelligent retrieval. If traditional video surveillance is a means to search for criminal suspects afterwards, then intelligent surveillance is an auxiliary means to stop crimes from occurring, thereby greatly improving monitoring efficiency. Moreover, because the smart device can selectively transmit video, it effectively saves bandwidth and greatly increases the available network bandwidth. Today, intelligent monitoring has become an important topic for monitoring technology development and market demand.
3. Accelerating the popularity of low-light illumination With the increasingly high-end private-sector use of security monitoring, the application range of cameras has become more and more widespread. Many cameras with poor monitoring conditions and dim light also require installation of versatile cameras, especially low illumination. Camera. In addition, in order to meet the needs of all-weather 24-hour monitoring, new low-light cameras have become the new darling of the surveillance market. At present, low-light cameras have been widely used in financial, cultural, hotel, office, residential property management and other fields.
As we all know, with the same photosensitive area image sensor, the higher the pixel number, the smaller the photosensitive area allocated to each pixel, and the fewer the number of received photons, and the lower the performance of the low-light intensity, so many people will only have Hundreds of thousands of pixels of analog cameras are compared with megapixel network digital cameras for low illumination, and mistakenly believe that low illumination is the weakness of digital network cameras. In fact, digital cameras have continuously improved and improved in low illumination, and they have made breakthrough progress. The future development trend is also getting better and better.
Now, low-light high-definition network cameras have emerged. These cameras use a number of brightening technologies. In harsh monitoring environments, the effect of low illumination far exceeds that of analog cameras. They also have a prominent advantage, that is, ordinary cameras are low. Under the conditions of illumination, the color screen fades to a black and white image, and this product still displays a color image in low illumination, whether it is a static image or a dynamic image, it can show a strong sense of hierarchy, true color reproduction, and less noise. There are no trailing phenomena and other advantages. Industry experts believe that the improvement of low-light performance will accelerate the popularity of high-definition network cameras and accelerate the process of the era of high-definition surveillance.
1, high-resolution into the most basic appeal in the analog monitoring era, the user of the fuzzy, snow-filled noise of the picture has long been a bitter but not at all, because at the time the best camera on the market can only do D1, pixels in theory At most, there are only more than 400,000. In the non-security field, it is overwhelmingly digital cameras, video cameras, computer cameras, and mobile phone cameras, which are often millions or even tens of millions of pixels. Surveillance cameras are the largest assistants in security and analog surveillance products can no longer meet the needs of users. Therefore, "HD" has become the largest demand, and with high-definition picture quality, low illumination, wide dynamic, intelligent, etc. Only higher-level demands can be realized before they have application value.
High-definition screens mainly rely on technological breakthroughs, starting with improving the quality of video sources. The digital network camera adopts progressive scanning relative to the analog camera. Commonly used CMOS sensors have built-in AD conversion, optical signal input, and digital signal output, avoiding repeated AD conversion, low image quality, and in color reproduction and signal Anti-interference performance is excellent.
The front sensor of the analog camera outputs an analog signal, which is then converted into a digital signal for color and brightness processing. The digital signal is then converted into an analog signal output. When reaching the back-end equipment such as DVR, the video acquisition chip (eg: 7130, 6805) converts the analog signal into a digital signal, and a total of 3 times of AD conversion occurs. The screen is seriously damaged when the composite video is transmitted to the video acquisition chip. When the video capture chip performs AD conversion, it also needs to perform bright color separation (comb filter). This makes it difficult to completely separate the brightness and color signals, resulting in the appearance of color penetration and variability in traditional analog video surveillance.
2. Intelligently improving monitoring efficiency Traditional monitoring is defensive monitoring. There is a lack of interaction between people and machines. The emergence of intelligent monitoring has changed the status quo, turning passive into initiative, and using intelligent technology to timely and automatically source the original video. The information extracts a large amount of useful information, completes the transmission, preservation and retrieval of the video, and can also drive Other programs to run other intelligent actions. Its advantage is very obvious: all-weather reliable monitoring, improve alarm accuracy, fast response.
Intelligent monitoring can identify behaviors and types from complex data analysis and provide operational commands, data, and information to realize intelligent behaviors such as alarms, reminder attention, and intelligent retrieval. If traditional video surveillance is a means to search for criminal suspects afterwards, then intelligent surveillance is an auxiliary means to stop crimes from occurring, thereby greatly improving monitoring efficiency. Moreover, because the smart device can selectively transmit video, it effectively saves bandwidth and greatly increases the available network bandwidth. Today, intelligent monitoring has become an important topic for monitoring technology development and market demand.
3. Accelerating the popularity of low-light illumination With the increasingly high-end private-sector use of security monitoring, the application range of cameras has become more and more widespread. Many cameras with poor monitoring conditions and dim light also require installation of versatile cameras, especially low illumination. Camera. In addition, in order to meet the needs of all-weather 24-hour monitoring, new low-light cameras have become the new darling of the surveillance market. At present, low-light cameras have been widely used in financial, cultural, hotel, office, residential property management and other fields.
As we all know, with the same photosensitive area image sensor, the higher the pixel number, the smaller the photosensitive area allocated to each pixel, and the fewer the number of received photons, and the lower the performance of the low-light intensity, so many people will only have Hundreds of thousands of pixels of analog cameras are compared with megapixel network digital cameras for low illumination, and mistakenly believe that low illumination is the weakness of digital network cameras. In fact, digital cameras have continuously improved and improved in low illumination, and they have made breakthrough progress. The future development trend is also getting better and better.
Now, low-light high-definition network cameras have emerged. These cameras use a number of brightening technologies. In harsh monitoring environments, the effect of low illumination far exceeds that of analog cameras. They also have a prominent advantage, that is, ordinary cameras are low. Under the conditions of illumination, the color screen fades to a black and white image, and this product still displays a color image in low illumination, whether it is a static image or a dynamic image, it can show a strong sense of hierarchy, true color reproduction, and less noise. There are no trailing phenomena and other advantages. Industry experts believe that the improvement of low-light performance will accelerate the popularity of high-definition network cameras and accelerate the process of the era of high-definition surveillance.
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