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  • Megapixels HD surveillance cameras technical analysis

        With the continuous development of security monitoring technology , market demand for security monitoring is also rapidly changing. Since the anti-terrorism and other security requirements , user requirements of intelligent video surveillance systems increasingly urgent , so in recent years, high-definition video surveillance has become more clear direction , which means that users will be required to monitor more attention clarity of the image on the monitor , the monitor screen can be concerned about the extent consistent with the site , so that it can make use of intelligent analysis techniques to accurately identify abnormal target.
        Million cameras constitute
        Traditional analog camera is unable to meet the needs of high-definition image capture , HD has become the mainstream of today´s video surveillance. To achieve high-definition video surveillance, inseparable from HD cameras , so megapixels HD network camera products have emerged .
        Appears megapixels HD cameras , HD monitoring solution for the realization of the foundation , then what is megapixels HD camera it?
        Herein megapixels HD camera , referring to an IP-based network transmission HD cameras . In general constitute an example to introduce HD IP camera , front to back in order , including the lens , IR cut filter , the image sensor , clock synchronization and image processing compression coding motherboard , power supply and I / O network interface board .
        In all of the constituent parts , the most critical is the image sensor , which directly affects the index excellent HD webcam effects. Currently on the market most of the high-definition network cameras are used as a CMOS sensor, but compared with the CCD sensor , and its application in high-definition network camera has advantages.
        HD imaging results
        Currently, the industry is just megapixels camera on a generic definition network cameras , refers million and more than one million pixel high-definition camera , but the industry has not yet formed the relevant standard to define the relationship between megapixels and HD . The so-called megapixels , referring to the effective number of pixels used in network camera sensor reaches millions more, at the same time , this HD camcorder output screen resolution of at least live 1280 × 720. Today´s mainstream 1.3-megapixel , 2.0 megapixel , 5 megapixel or higher belong megapixels level network camera , image resolution output is generally at least 720P (1280 × 720) or 1080P (1920 × 1080).
        From the current industry accepted standards, the video screen resolution of 720P is a basic requirement for the HD , and even on some occasions it is called quasi- HD , because strictly speaking , 1280 × 720 resolution has not yet reached one hundred million pixels. And is generally recognized as the true high-definition images , video screen resolution needs to reach its 1920 × 1080, commonly referred to 1080P.
        From the above mentioned resolution of the video screen is easy to see , megapixels HD camera provides video screen is the era of traditional analog cameras can not match , improving the clarity of the image to expand horizons , are its most prominent advantage.
        On the one hand , from a numerical point of view contrast resolution : We can clearly see from Table 1 compares the resolution , the screen offers a resolution megapixels HD camera has several times the clarity of the advantages of conventional cameras .
        In addition to the video screen sharpness level , there is the practical application of a very important requirement that real-time video images to the PAL system , the need to achieve 25 frames / sec transfer and playback frame rate. Currently on the market in the most megapixels camera 720P or 1080P resolution format are able to achieve 25 frames / sec transmission and presentation of high frame rates , and achieve a resolution of 2560 × 1920 ultra- high-definition cameras can not achieve this mostly under real-time rendering clarity .
        Practical applications in the industry , customers tend to have a very clear monitoring requirements , as well as the objectives and requirements to be achieved . Such as bank teller monitoring, need to be able to clearly see the face of every person to come to transact business ; traffic road monitoring, need to be able to clearly see the license plate number of the vehicle on each lane pass. To meet these special needs, using the traditional way of non-HD monitor , often require a teller for each and every single lane installed a camera to monitor the vision of narrow , ensure clarity of surveillance targets.
        After applying megapixels HD camera , you can use a high-definition camera megapixels instead of multiple non-HD video camera , and can reach the traditional need to use multiple cameras in order to achieve the monitoring results.
        Three-lane road monitoring , if you use the camera ´s SD D1 resolution format monitors To obtain a clear license plate information, you need to install a camera for each lane , three cameras were needed to complete the entire lane monitoring.
        The use of megapixels HD camera , a video camera can be achieved on the three -lane monitoring , and get a clear license plate information . HD monitoring program , requires only one to three -lane high-definition surveillance cameras can be completed
        Appears megapixels HD camera to the majority of users will undoubtedly bring a great convenience , but also makes security monitoring quality has been greatly improved, while also continue to accelerate the traditional analog cameras quit existing markets. Faced with numerous advantages million HD camera , then in practical application if you want to select the higher pixel camera monitoring results greater good? Actual fact, of course, brings to enhance megapixels HD picture quality , but it also should look at to increase their impact on network bandwidth , as well as to enhance the storage space requirements , such as 1080P HD screen , five times the clarity of standard definition screen D1 , D1 resolution transmission , it is necessary bandwidth can only be transmitted 1M and storage , and transmission of 1080P HD requires up to 6M bit rate for transmission and storage. Therefore, the use of megapixels HD camera HD monitoring solution construction , the need for considering the transfer and storage of inputs, select the most appropriate definition cameras, and not blindly choose five megapixels , and even millions of pixels product ; perhaps 1.3 million , 2 million pixel camera is the most suitable choice.
        Use megapixels HD camera , you must also choose the right camera lens , you first need to choose to use the high-definition camera , if you are still using ordinary, non- high-definition camera , it will not be showing megapixels ultra-high resolution HD camera effect . In addition , depending on the applications you want to monitor the environment and the objectives and requirements , but also to choose the right focal length of the lens , which is to select the target to meet the monitoring requirements of vision lens . If you choose wide-angle lens , its viewing angle, generally above 90 degrees, suitable for monitoring large-scale, short-range places ; choose a telephoto lens , its viewing angle less than 20 degrees , mainly used for a wide range of ultra- long-range environmental monitoring , such as forests , stadiums , seaports and other high-altitude surveillance hope .