With the continuous development of security monitoring technology, the market demand for security monitoring is also changing rapidly. In recent years, high-definition video surveillance has become a relatively clear development direction, which means that users' attention to monitoring requirements will pay more attention to the clarity of surveillance images, and to what extent the surveillance images can be consistent with the scene. Enables the use of intelligent analysis techniques to accurately identify anomalous targets.
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Million HD camera
Traditional analog cameras are unable to meet the needs of high-definition image acquisition, and HD has become the mainstream of today's video surveillance. To achieve high-definition video surveillance, high-definition cameras are indispensable, so megapixel high-definition network cameras came into being.
The emergence of megapixel HD cameras has laid the foundation for the realization of high-definition surveillance solutions. So what is a megapixel HD network camera?
The megapixel HD camera described here refers to an HD camera based on IP network transmission. Take the general HD network camera configuration as an example, including the lens, infrared cut filter, image sensor, clock synchronization and image processing code compression motherboard, power supply and I/O network interface board, in order from all directions. Among them, the most important is the image sensor, and its excellent index directly affects the high-definition network camera picture effect. Most HD network cameras on the market currently use CMOS as a light-sensing component. Compared with CCD sensors, their applications on HD network cameras have advantages.
HD imaging effect
At present, the megapixel camera is just a general term for high-definition network cameras in the industry. It refers to high-definition cameras with millions or more pixels, but the industry has not yet formed relevant standards to define the relationship between megapixels and HD. The so-called megapixel refers to the number of effective pixels of the sensor applied to the network camera of more than one million. At the same time, the resolution of the live image output by the high-definition camera is at least 1280×720. Today's mainstream 1.3 million pixels, 2 million pixels, and even higher 5 million pixels are megapixel network cameras, and the output image resolution is generally at least 720P (1280 × 720) or 1080P (1920 × 1080).
The video images provided by megapixel HD cameras are unmatched by the traditional analog camera era. The improvement of sharpness and the expansion of image field of view are their most prominent advantages. From the recognized standards of the current industry, the video screen resolution of 720P is the most basic requirement for high definition. Even some occasions call it quasi-high definition, because in the strict sense, the resolution of 1280×720 has not reached 100. CMOS. The true HD image, which is usually recognized, requires a video frame resolution of 1920×1080, which is commonly called 1080P.
On the one hand, from the comparison of resolution values: the megapixel HD camera provides a resolution of several times that of traditional camera resolution.
In the actual application of the industry, customers often have very clear monitoring requirements and the target requirements to be achieved. For example, bank teller monitoring needs to be able to clearly see the face of each person who comes to handle the business; traffic road monitoring needs to be able to clearly see the license plate number of the vehicle passing through each lane. In order to meet these special needs, traditional non-HD monitoring methods are often used, and it is often necessary to install a separate camera for each lane for each teller, in order to reduce the monitoring field of view and ensure the clarity of the monitoring target.
After applying a megapixel HD camera, you can use a megapixel HD camera instead of multiple non-HD cameras, and you can achieve the monitoring effect that you need to use multiple traditional cameras at the same time.
Three-lane road monitoring, if using a standard-definition D1 resolution camera for monitoring, if you need to obtain clear license plate information, you need to install one camera for each lane separately, a total of three cameras are required to complete the entire lane. monitor. With a megapixel HD camera, you can monitor a three-lane camera and get clear license plate information. In the high-definition surveillance solution, only one HD camera is required for 3 lanes to complete monitoring.
In addition to the high definition of the video picture, there is a very important requirement in the practical application, that is, the real-time performance of the video picture, in the PAL system, it is required to achieve a transmission and playback frame rate of 25 frames/second. Most megapixel cameras on the market today can achieve high frame rate transmission and presentation at 25 frames per second in 720P or 1080P resolution formats, while most ultra-high definition cameras with resolutions up to 2560×1920 cannot achieve this. Real-time rendering under clarity.
The emergence of megapixel high-definition cameras has undoubtedly brought great convenience to the majority of users, and has greatly improved the quality of security monitoring. At the same time, it has also accelerated the withdrawal of traditional analog cameras from the existing market. Faced with the many advantages of a million HD cameras, is it better to choose the higher the pixel monitor effect in practical applications? In fact, megapixel HD will bring the improvement of picture quality, but it should also be seen. To the increase in network bandwidth consumption and the increase in storage space requirements, such as 1080P high-definition pictures, five times the definition of D1 picture in the definition, D1 resolution transmission, only need 1M bandwidth to transmit And storage, while 1080P HD transmission requires up to 6M bit rate for transmission and storage. Therefore, when using a megapixel high-definition camera for high-definition surveillance solution construction, it is necessary to consider the transmission and storage investment, and select the most suitable high-definition camera, instead of blindly selecting 5 megapixels or even 10 million pixel products; Perhaps a 1.3 million, 2 megapixel camera is the most suitable choice.
Intelligent application
Throughout the megapixel high-definition cameras on the market, there are many models with different characteristics, and its special features combined with high-definition cameras are combined with intelligent video analysis technology, which has become a highlight of the development of high-definition cameras. Such as intelligent high-definition network cameras, the intelligent video analysis technology and megapixel HD have been organically integrated.
Intelligent video analysis technology has become the mainstream of today's technology development, and has been widely used. This article does not specifically analyze this technology, but mainly discusses the application of smart and high-definition dual-swords.
Megapixels bring high-definition picture quality, bringing video surveillance to the era of high-definition surveillance, but without changing the traditional passive monitoring mode.
The high-definition display of the live image certainly brings the visual experience of high-definition picture quality to the monitoring personnel, but it still cannot change the passive situation such as unfocused observation and easy omission in many monitoring sites. A clear picture, if the police can not receive the warning for the first time in the event of an alarm, its effective value will be greatly reduced. By using the early warning function of intelligent video analysis, the high-definition picture with alarm will pop up in the first time, and the monitoring efficiency will be greatly improved.
In the era of traditional analog camera monitoring, because the camera itself does not have a DSP chip for video processing, it is impossible to embed the intelligent video analysis algorithm into the camera. To achieve intelligent monitoring, additional intelligent video analysis equipment, cost and maintenance investment are required. Both are larger. The emergence of a megapixel high-definition camera, which has a DSP chip that is a video processing chip, can embed an intelligent video analysis algorithm into a megapixel HD camera. Since the intelligent video analysis algorithm will occupy the processing power of the DSP, in order not to affect the video compression, the quality of the video picture is guaranteed, and at the same time, in order to ensure that the intelligent video analysis algorithm has sufficient computing resources to achieve higher performance, some manufacturers adopt dual DSP chips. The way, on the one hand, to ensure a million high-definition picture quality, on the other hand to ensure the performance of intelligent video analysis.
Based on the megapixel camera, it lays the foundation for the realization of intelligent video analysis. As we all know, intelligent video analysis is based on images for analysis of events, the premise is that the image, whether the image is clear or not directly determines the accuracy of the event analysis. The emergence of megapixels provides a high-definition image source for intelligent analysis, and the accuracy of intelligent video analysis has been greatly improved. At present, manufacturers have standardized the accuracy of intelligent video to 3×3 pixels, without a high definition. The video source is guaranteed, and such precision is difficult to achieve. The emergence of megapixel HD cameras not only provides high-definition images for our visual inspection, but also provides a high-definition analysis source for intelligent analysis of equipment, which is convenient for monitoring intelligence.
Megapixel and intelligent analysis are undoubtedly the two hot topics in the monitoring market today. The two are combined into one. They are the most efficient and practical combination in terms of product form and practicality. I think it must be It will be the future direction of development.
With the development of video compression technology and the improvement of chip technology, the video compression ratio is continuously improved. The network bandwidth and the occupied storage space consumed under the same picture quality will be reduced, and the market competition will continue to meet the demand. For a perfect realization of self. It profoundly affects the field of surveillance technology and will profoundly change our way of life. At that time, the application of megapixel high-definition cameras will become more popular, and 5 million or even 10 million-pixel high-definition cameras are bound to be gradually popularized.
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