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Super high definition video surveillance is coming by guard summer
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Super high definition video surveillance is coming |
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Business,Science & Technology,Electronics
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Due to the current digital video surveillance systems often hard to see or face recognition and other cases, people have come to expect a higher resolution to enhance the value of the monitoring system, but the monitoring system is generally not the situation when almost no return, so people always want it to do less investment, and therefore the video surveillance industry is always better than the pursuit of the most intense video effects film industry belated. HD cameras from 1M, 2M, 3M, 5M, 6M, 8M or 12 million pixels, which is one step closer to us, of which 8 million pixels and the film and television industry, 4K, respectively. This year manufacturers have come up with a 4K Ultra HD camcorder reviews do publicity, but there is no real market, is expected later this year 4K ultra high-definition video surveillance cameras will become the high-end marketplace. Although a few years before 720P and 1080P camera use in high-definition large-scale construction projects safe city monitoring time, the manufacturers have also introduced a 3 million and 5 million pixel high-definition camera, but in the surveillance industry, the camera bears a completely different light environments shooting task, the early 3 million and 5 million pixel camera illumination poor photographic capabilities, resulting in the integration of the night, even in conventional infrared light fill light noise is relatively obvious, can not see the video screen content, but also unable to reach 25 / s real-time frame rates, so before this mainstream 3 million to 5 million-pixel cameras are not suitable for conventional 24 hours day and night surveillance. The current sensitivity better 3 million and 6 million-pixel high-definition network camera ultra low-light photoreceptor already solved the problem of poor, the other is now 3 million pixel model can also support up to 60 frames / sec high frame rates, high users can frame rate demands attention to the 3 million-pixel models come up. Due to 3 million pixel model with a resolution of 2048 × 1536, which compared to 1080P 1920 × 1080 mainly to enhance the vertical resolution, while the horizontal resolution is almost no improvement, so the 3 million pixel model mainly in the field of view of the shooting at the same level At the same time enhance the vertical angle field of view. And in the horizontal and vertical viewing angle is essentially the same situation, if you want to enhance the clarity you need to select 6 million or 8 million pixel models, the horizontal resolution of 1080P 1000-1100TVL from elevated to 2000-2200TVL. And to meet the user's existing definition, the meaning of ultra-high definition video surveillance lies with the 1080P with the case definition, monitoring FOV doubled, monitoring range has been greatly improved. HD network camera core device is a sensor, and the sensor technology driven by the needs of the film industry has already grown to ten million pixel level, ancillary imaging optical lens is the most important part of the lens of the eye lens like a person, make sure it can be seen clearly in the world. In the surveillance industry varifocal auto iris night infrared lens is generally preferred surveillance cameras, but most manufacturers of this type of lens resolving power is only 2 million to 3 million pixels, and only a very few manufacturers have 5,000,000 or 8,000,000 pixels resolution power of the lens, the lens at the same time ensuring ultra-high-definition imaging, large aperture also ensures its configuration amount of light into the night in order to enhance the effect of low-light video camera. It is because of the resolution improved significantly, leading to bottlenecks surveillance cameras focused on the ISP image processing and compression coding processing technology, greatly enhance the resolution makes compression coding processing chip pressure Alexander. Video compression coding processing industry but do not pay attention focused on quality compression rate, which generally use two calculations do most rational allocation of variable bit rate, and surveillance cameras completely different compression chip is required to have not less than the sensor output video frame rate of real-time compression coding ability, otherwise the data accumulated stack will make the camera memory is full support; hand coding delay as small as possible, so as to ensure control room staff to see the video screen with real-time, so that in the event of an emergency respond quickly when an event. Although compression chip facing such a huge pressure, but the processor computing power has been rapid development, currently the most powerful compression coding chip can already cope with 8 million pixels 25 frames / sec low latency hardware compression, and even extra capacity do the second, third stream HD compression coding; while doing smart and intelligent analysis alarm. Three yards streams become standard network cameras but also solve the network camera needs enough bandwidth to support the issue, the main stream in the LAN access storage devices do the high bit-rate video storage, sub-stream to provide low-resolution, low-yards rate stream to mobile phones and other mobile devices to do the monitoring, and the third stream can without affecting the first two applications, arbitrarily set the resolution, frame rate and bit rate to provide to the public network-based remote HD preview, and Although telecom operators began to spread tens to hundreds of megabytes of high-speed fiber-optic broadband access, but has limited upstream bandwidth at very low 512kbps to 2Mbps. The third stream may be provided by a low frame rate and bit rate HD video streaming remote preview, avoiding the impact on local video, broadband standard in the country before making upstream bandwidth requirements did not join, the third stream in the domestic Internet under the environment has become an important function of the network cameras to accommodate national circumstances. Ultra-high resolution and high frame rate of real-time hardware compression chip, although not bother, but the rate commonly used in the industry H.264 / AVC compressed still difficult to meet people's aspirations, mainstream manufacturers generally use H.264HighProfile compression coding , 6000000/8000000 @ 25fps video encoding requires the use of the rating 6-10Mbps, some manufacturers still use H.264BaselineProfile low grade compression coding, 1080P need to 8Mbps at this level coding, the former compared to the latter apparently did not much higher, but people do not want to do the hard disk and network bandwidth more investment in the case of ultra-high-definition video camera needs to have a higher compression ratio and compression technology to be able to lower bit rate 1080P as accepted by the public. In terms of network transmission, due to monitor network cameras are generally used in a LAN into, even in the "Green City", the operator is also used by private network consisting of optical fiber leased line, so the ultra-HD network camera transmission in such a network and not much pressure on; to the public network in real-time ultra-high-definition video preview, you also need to further improve the compression efficiency and expect telecom operators to improve the home network upstream bandwidth limit, or even the basic HD real-time transmission in shops and family RMON are difficult to achieve. Storage devices, ultra HD network camera changed just take up more storage space, resulting in the number of storage devices storage period and total access channel decreased. For the user, to enhance the quality and take up more storage space may be difficult to accept, but unchanged from the quality aspects of monitoring increases the field of view angle, the user can accept or ultra-high definition video camera, such as a street intersection originally mouth takes 2-3 ordinary camera can do a good job covering the environment sufficient clarity, ultra-high-definition camcorder with a 1-2 to meet the original definition, and do adequate environmental coverage. Ultra-high-definition video to show in front of the most intuitive user-dependent step on the display device. Household 4K TV has been popular, but looking back each monitor screen manufacturers of products, we found that 4K monitor screen is difficult to find, very few manufacturers have some 4K monitor screen is also very expensive, after all, has a very different home screen and LCD monitor, household products for daily use time about eight hours to design, and monitoring screen in accordance with 24 hours of continuous use to design. More current monitoring display system using a decoder with mosaic screen programs to achieve the stitching 4 1080P screen into a 4K display unit, so you can display a lossless 4K HD video. This is the home system of monitoring system and the difference lies, multiple screen display not only solve the problem of lack of resolution of the display device, but also to solve the display size of the device is not big enough problem, so ultra-HD resolution video display video wall in the monitoring center still rely on the mosaic screen to achieve. If you want a single screen full pixel display ultra high-definition video or four-way split display full HD video, we still need to wait for the popularity of 4K monitor screen.
Related Articles -
network video surveillance, HD network camera,
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