HD-SDI products are for users or for the most intuitive effect, resolution is undoubtedly the only standard for determining products. The resolutions included in HD-SDI include: 1920×1035, 1920×1080, 1280×720. The frame rate of different images can reach 30P or 60P. If non-compressed image transmission is realized and output by computer, then this series of products The supported resolution is too small, and it is difficult to match the computer output image frame rate. Therefore, on the basis of non-compression, the HD-SDI product application has encountered limitations.
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The image output by the HD-SDI surveillance camera is indeed a high-definition image. The high-definition image of the SDI product is limited to the resolution. In terms of image quality, perhaps the low frame rate of the image becomes its biggest obstacle. The image frame rate of 1920×1080 resolution is only 30P, which causes the distortion rate of the image. Although some images are difficult to distinguish by the human eye, intelligent analysis can clearly identify the things that need to be recognized from the image and requires a higher image. Frame frequency. The biggest driving force for the development of intelligent analysis technology comes from high-definition image quality, real-time transmission, how to achieve high frame rate, uncompressed, real-time transmission in the transmission process, perhaps making SDI difficult. The inevitable low frame rate has become another drawback of the development of this technology.
Due to the large resolution image output by HD-SDI, transmission media has become an important expense in engineering costs. The 1080P image quality can be transmitted at a code rate of 1.485 Gbps, and the wide bandwidth becomes a necessary transmission item. Two options: First, choose fiber transmission, which is obviously a kind of high-consumption material, especially for short-distance transmission in monitoring system, it is not cost-effective to use fiber-optic cable; second, choose coaxial cable, which is also not popular Type products require unique transmission channels and strong anti-interference ability. HD-SDI cameras use different HDMI cable materials to transmit different levels of interference, and specific cables undoubtedly increase engineering costs.
In summary, whether it is image resolution, image quality or peripheral wire and application areas, HD-SDI products have indeed encountered no small obstacles and drawbacks in development. How to solve software and hardware is the security manufacturers should focus on Thinking about the problem.
The triode, the full name should be a semiconductor triode, also known as a bipolar transistor, a crystal triode, is a semiconductor device that controls current. Its function is to amplify the weak signal into an electrical signal with a large amplitude value, and also as a non-contact switch.
Transistor is one of the basic components of semiconductors, with current amplification, is the core component of electronic circuits. The triode is made up of two closely spaced PN junctions on a semiconductor substrate. The two PN junctions divide the monolithic semiconductor into three parts, the middle part is the base area, and the two sides are the emitter area and the collector area, and the arrangement is PNP. And NPN two.
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