The definition of high definition first came from the digital television field. The monitoring industry borrowed from relevant standards of the broadcasting and television industry. In September 2010, Shanghai issued the first local technical specification for digital cameras for security surveillance. With the development of intelligent, high-definition, and platform-based troika, networked monitoring has gradually evolved from the optical simulating machine in the initial simulation era to the analog matrix, and now it has become a server in the digital age and a digital network matrix. With development, some new concepts and new terms will emerge one after another.
Resolution continues to increase In terms of resolution, the development of high-definition network cameras can be said to be a thousand miles away, in addition to the current contact with more megapixels, 1.3 million pixels, 2 million pixels, 3 million pixels, 5 million pixels, 8 million pixels The products have already appeared in the market, and even millions and millions of pixels of products have begun to show up in the monitoring industry. It can be said that people will never stop on the road to pursue more clearly.
However, some manufacturers still have other naming methods for high-definition network cameras, such as megapixel HD network cameras, 2 million pixel HD network cameras, etc., which can be understood as "non-standard" naming, and it has certain "standard" Associated but not simple. For example, 720p pixels are 921,600, and 1080p pixels are 2,073.6 thousand. They can be called megapixels and 2 million pixels respectively, but the common 1.3 million pixels have an actual resolution of 1280×1024, although they have higher definition. However, it does not comply with the broadcasting industry standards.
COMS gradually replaced CCD
CCD sensors are generally considered better than CMOS sensors in terms of sensitivity, resolution, noise control, etc., while CMOS sensors are characterized by low cost, low power consumption, and high integration.
The deficiencies in the performance of CMOS sensors are being improved through continuous technological innovations. The main technical breakthroughs are the improvement of imaging performance under low illumination conditions and the reduction of noise signals in images.
With the development of technology, the performance of CMOS sensors is rapidly improving. In addition, although the resolution of the same size CCD sensor is better than that of the CMOS sensor, the CMOS sensor's advantage in yield can effectively overcome the difficulty in manufacturing the large-size photosensitive element without considering the size limitation, so that the CMOS sensor is at a higher resolution. Will have more advantages. In addition, the CMOS sensor responds faster than the CCD, so it is more suitable for large data volume features of high-definition monitoring.
From the market point of view, SONY, a traditional manufacturer of CCDs, has begun to shift its focus to CMOS sensors. It not only developed ClearVidCMOS technology, but also introduced the Exmor series of high-definition CMOS products, which are almost the same in its high-definition network cameras. The use of CMOS sensors may be seen as a phased victory for CMOS sensors.
Increasing application scale and increasing complexity of intelligent HD platforms With the popularity of high-definition surveillance, more and more manufacturers are realizing that "the market for the platform will win" and have spared no effort to launch their own comprehensive monitoring platform to meet the road. The need for digital, multi-regional, high-definition, and intelligent platform construction.
In the past, the construction of security monitoring systems was mainly for safety precautions, but now more customers are increasingly valuing management requirements in their use. For example, in the HD Safe City project, users not only hope that the system provides the basis for the investigation of public security, but also hopes to be used in various business applications such as the government's emergency command, rescue and disaster relief, and environmental protection department's sewage detection.
In the past, video surveillance systems usually had only a few tens or hundreds of camera points. However, the current application of video surveillance systems is increasing in scale. The need to cover a city or even cover the whole country is often mentioned. Typical, such as the safe city, to achieve a network of key video surveillance information coverage, and even video sharing in multiple cities and reporting to the superior video system. The construction of video surveillance for rail transit will set up several or dozens of camera points at each railway station. A few dozen stations on a railway line will be connected, and hundreds of railway lines will all be brought together to the Ministry of Railways. It is a very large one. system. The video surveillance system presents a strong networking demand. Once it is networked, the number of video capture point applications is increasing and the coverage is getting wider and wider. The technical requirements and expansion capabilities of the platform are also increasing.
Industrial chain cooperation is becoming more and more tight The traditional security equipment manufacturers often produce cameras, matrices, monitor displays and other product components at the same time. With the development of the networked application of video surveillance, the division of labor in the industrial chain will become increasingly finer. Some manufacturers specialize in cameras. Some manufacturers specialize in DVRs. Some manufacturers may specialize in platforms, and some manufacturers do monitors. Afterwards, it is integrated with integrators and provided to end customers. This close industrial cooperation model requires the platform to provide increasingly standardized interfaces. Technological advancements have improved the video surveillance platform architecture. However, the previous video surveillance platform was only responsible for managing equipment and user information. However, with the advancement of technology, especially the development of video intelligent analysis technology, video cameras output not only video information, but also There are also many results of video intelligence analysis. The functions of these intelligent videos may require platforms to analyze and process. This will require platform devices to adapt and support intelligent services to meet more and more powerful video intelligence. Functional development. Intelligence is just one of these technologies, and the progress of network transmission technologies such as 3G or 4G technologies may require platforms to support the progress of these new technologies to provide more flexible and powerful features.
Conclusion In the past two years, many intelligent analysis programs have been promoted in the video surveillance industry, but the effect is not very good. It is often just a gimmick for manufacturers to promote their products. The reason for this is that on the one hand, the technology of the intelligent analysis algorithm itself is not perfect and there is no substantial breakthrough; on the other hand, the resolution of the traditional "SD" camera is limited, and it is impossible to provide a sufficiently clear image for the intelligent analysis algorithm. With the wide application of high-definition network cameras, while constantly satisfying the demands of market competition, this situation will be changed, tending towards the perfect realization of a self.
Resolution continues to increase In terms of resolution, the development of high-definition network cameras can be said to be a thousand miles away, in addition to the current contact with more megapixels, 1.3 million pixels, 2 million pixels, 3 million pixels, 5 million pixels, 8 million pixels The products have already appeared in the market, and even millions and millions of pixels of products have begun to show up in the monitoring industry. It can be said that people will never stop on the road to pursue more clearly.
However, some manufacturers still have other naming methods for high-definition network cameras, such as megapixel HD network cameras, 2 million pixel HD network cameras, etc., which can be understood as "non-standard" naming, and it has certain "standard" Associated but not simple. For example, 720p pixels are 921,600, and 1080p pixels are 2,073.6 thousand. They can be called megapixels and 2 million pixels respectively, but the common 1.3 million pixels have an actual resolution of 1280×1024, although they have higher definition. However, it does not comply with the broadcasting industry standards.
COMS gradually replaced CCD
CCD sensors are generally considered better than CMOS sensors in terms of sensitivity, resolution, noise control, etc., while CMOS sensors are characterized by low cost, low power consumption, and high integration.
The deficiencies in the performance of CMOS sensors are being improved through continuous technological innovations. The main technical breakthroughs are the improvement of imaging performance under low illumination conditions and the reduction of noise signals in images.
With the development of technology, the performance of CMOS sensors is rapidly improving. In addition, although the resolution of the same size CCD sensor is better than that of the CMOS sensor, the CMOS sensor's advantage in yield can effectively overcome the difficulty in manufacturing the large-size photosensitive element without considering the size limitation, so that the CMOS sensor is at a higher resolution. Will have more advantages. In addition, the CMOS sensor responds faster than the CCD, so it is more suitable for large data volume features of high-definition monitoring.
From the market point of view, SONY, a traditional manufacturer of CCDs, has begun to shift its focus to CMOS sensors. It not only developed ClearVidCMOS technology, but also introduced the Exmor series of high-definition CMOS products, which are almost the same in its high-definition network cameras. The use of CMOS sensors may be seen as a phased victory for CMOS sensors.
Increasing application scale and increasing complexity of intelligent HD platforms With the popularity of high-definition surveillance, more and more manufacturers are realizing that "the market for the platform will win" and have spared no effort to launch their own comprehensive monitoring platform to meet the road. The need for digital, multi-regional, high-definition, and intelligent platform construction.
In the past, the construction of security monitoring systems was mainly for safety precautions, but now more customers are increasingly valuing management requirements in their use. For example, in the HD Safe City project, users not only hope that the system provides the basis for the investigation of public security, but also hopes to be used in various business applications such as the government's emergency command, rescue and disaster relief, and environmental protection department's sewage detection.
In the past, video surveillance systems usually had only a few tens or hundreds of camera points. However, the current application of video surveillance systems is increasing in scale. The need to cover a city or even cover the whole country is often mentioned. Typical, such as the safe city, to achieve a network of key video surveillance information coverage, and even video sharing in multiple cities and reporting to the superior video system. The construction of video surveillance for rail transit will set up several or dozens of camera points at each railway station. A few dozen stations on a railway line will be connected, and hundreds of railway lines will all be brought together to the Ministry of Railways. It is a very large one. system. The video surveillance system presents a strong networking demand. Once it is networked, the number of video capture point applications is increasing and the coverage is getting wider and wider. The technical requirements and expansion capabilities of the platform are also increasing.
Industrial chain cooperation is becoming more and more tight The traditional security equipment manufacturers often produce cameras, matrices, monitor displays and other product components at the same time. With the development of the networked application of video surveillance, the division of labor in the industrial chain will become increasingly finer. Some manufacturers specialize in cameras. Some manufacturers specialize in DVRs. Some manufacturers may specialize in platforms, and some manufacturers do monitors. Afterwards, it is integrated with integrators and provided to end customers. This close industrial cooperation model requires the platform to provide increasingly standardized interfaces. Technological advancements have improved the video surveillance platform architecture. However, the previous video surveillance platform was only responsible for managing equipment and user information. However, with the advancement of technology, especially the development of video intelligent analysis technology, video cameras output not only video information, but also There are also many results of video intelligence analysis. The functions of these intelligent videos may require platforms to analyze and process. This will require platform devices to adapt and support intelligent services to meet more and more powerful video intelligence. Functional development. Intelligence is just one of these technologies, and the progress of network transmission technologies such as 3G or 4G technologies may require platforms to support the progress of these new technologies to provide more flexible and powerful features.
Conclusion In the past two years, many intelligent analysis programs have been promoted in the video surveillance industry, but the effect is not very good. It is often just a gimmick for manufacturers to promote their products. The reason for this is that on the one hand, the technology of the intelligent analysis algorithm itself is not perfect and there is no substantial breakthrough; on the other hand, the resolution of the traditional "SD" camera is limited, and it is impossible to provide a sufficiently clear image for the intelligent analysis algorithm. With the wide application of high-definition network cameras, while constantly satisfying the demands of market competition, this situation will be changed, tending towards the perfect realization of a self.
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