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  • HD network camera surveillance needs of the times Aspects

        Network camera HD video surveillance today is undoubtedly the first major theme. On the one hand, electronics, the rapiddevelopment of network technology greatly enhance the value and scope of its application; the other hand, the rapid expansion of global demand for security and the increasing use of user requirements has greatly stimulated the development of network cameras.

        Network camera IP camera, also known as the name implies, this type of camera images can be transmitted to the other side of the network, and the remote viewer can just use a web browser to monitor the image. This is a traditional camera and network technology combined produced a new generation of cameras.

        But not able to connect to the Internet is the network camera. Network cameras can be divided into two categories, one is the front-end analog CCTV camera-based, with video processing and network transmission module is a combination of analog-digital hybrid network camera; second is a pure digital network cameras. Fundamental difference between the two is that the former is still essentially an analog camera, its implementation mechanism is the A / D-D / A-A / D, after the two analog-digital conversion, and ultimately the formation of the network signal, the highest quality can not exceed D1. The latter mechanism is the realization of A / D analog signal directly to the network, thus greatly improving efficiency, thereby greatly improving the quality, because quality improvement to reduce the snow noise, so even though pixels high, but uses code flow but little, better applicability of its network. Because of the superiority of pure digital network cameras, the analog network camera on the market will gradually be eliminated, the following are mentioned in this article are pure digital high-definition network camera network camera.

        In the era of digital surveillance, monitoring demand as people gradually increase, starting toward the high-definition network cameras, intelligent direction, this paper is to explore in the next few years, network camera technology trends.

        1, into the most basic demands of high-definition

        In the era of analog control, users of vague, full of snow is already a pain for the picture noise but do nothing, because it was the best cameras on the market can only achieve D1, the most pixels in theory, only 40 million. In non-security areas, is overwhelming digital cameras, camcorders, PC cameras, mobile camera, easily tens of millions or even tens of millions of pixels. The largest surveillance cameras as a security assistant, analog type control products can not meet user needs, then, "HD" has become the first big demand, but, with high-definition picture quality, low-light, wide dynamic, intelligent, etc. higher levels of demand can be achieved only with the application.

        High-definition picture depends on technological breakthroughs, the first from the video source to enhance the quality start. Digital network cameras as opposed to analog cameras with progressive scan, commonly used in CMOS sensor built-in AD converter, the optical signal into digital signal output, to avoid repeated AD conversion, quality damage is small, and in color reproduction, signal interference in outstanding performance.

        Analog front of the camera sensor output analog signals, then converted into digital signals for color and luminance processing, then the digital signal and then converted into an analog signal output. When you reach the back-end equipment such as DVR, the video capture chip (such as: 7130,6805) the analog signals into digital signals, a total of three times occurred in the AD conversion, the picture severely damaged when the composite video transmission to the video capture chip When, in addition to doing the video capture chip AD converter, but also do bright separation (comb filtering), due to be completely separate brightness and color signals, leading to traditional analog video surveillance is prone to infiltration and variegated color phenomenon.

        2, low-light to accelerate the pace of spread

        With high-end security monitoring by the dedicated area of ​​increasing civilian, camera applications are increasingly being used a lot of poor monitoring, dimly lit places require the installation of feature-rich camera, especially low-light camera. In addition, 24-hour surveillance in order to meet the needs of new technology-based low-light surveillance camera has become the new darling of the market. Currently, low-light cameras have been widely used in finance, Fair, hotels, office buildings, residential property management.

        As we all know, the same sensitive area of ​​the image sensor, more pixels, each pixel is assigned to a sensitive area will be smaller, the number of photons received less, with the attendant low light performance is worse, so many people will only hundreds of thousands of pixels above the analog cameras digital megapixels network camera illumination contrast, and mistakenly believe that illumination is the soft underbelly of the digital network cameras. In fact, digital cameras continue to improve the sound in low-light areas, has been a breakthrough in the future, the trend is getting better.

        Now, low-light cameras have been a high-definition network, this camera uses a number of Plus technology, the monitoring in harsh environments, illumination effects far more than the analog cameras, they also have a prominent advantage that ordinary cameras at low illumination conditions after a color screen fade to black and white images in low light and this product is still showing a color image, whether static or dynamic screen display, can show strong sense of hierarchy, true color reproduction, less noise, No smearing, etc.. Industry experts believe that low-light performance improvement will accelerate the pace of the popularity of high-definition network cameras, high definition monitors to speed up the process big time.

        3, intelligent improve monitoring efficiency

        Traditional monitoring the defensive monitoring, lack of interaction between people and machines, intelligent control has changed this situation, change from passive to active, intelligent technology through timely and automatically extract information from the original video a lot of useful information, complete preservation and retrieval of video transmission, can also drive other programs running other intelligent behavior. The advantages are clear: reliable all-weather surveillance, improve the alarm accuracy, fast response.

        Intelligent control from the complex data analysis to identify the type of behavior and can provide operating commands, data and information in order to achieve the alarm to alert attention, intelligent retrieval intelligent behavior. If the traditional video surveillance is a search after the suspect´s means, then it is an intelligent monitoring aid in preventing the crime was committed, thus greatly enhancing the monitoring efficiency. And as the smart device to selectively transmit video to effectively conserve bandwidth, greatly increasing the available network bandwidth. Today, intelligent monitoring the development of monitoring technology has become an important theme and market demand.

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