The IP network has brought great improvements to interconnection and interoperability. It has realized multiple platforms for interconnection, can integrate various social resources, and cooperate with the command center and information center to achieve information exchange, resource sharing, and technology compatibility, which is conducive to All kinds of social resources are shared, which can handle various events and respond quickly. The "plug and play" mode provides flexible expansion capabilities.
The technical characteristics of high-definition network cameras are the most important applications. The high-resolution images of high pixels and transmission through the network can easily realize multi-region networking and remote control, security monitoring, which has very important significance:
1. The popularization of high-definition network cameras with more convenient multi-area networks is becoming more and more abundant in connecting and matching high-definition embedded NVR products and back-end products. Network cameras, especially high-definition network cameras, play an important role The function is the embedded architecture of network video stream recording, storage and real-time visual supply and proxy forwarding function, hardware decoding, standard video or high-definition video camera that supports multiple network access.
2. Larger coverage area. One of the advantages of high-definition network cameras is their wide coverage. The same surveillance area can replace multiple fixed-point cameras or omnidirectional cameras. For dense places, such as airport security channels, stations, subways, mall entrances, parking lots, factories, and bank tellers, it was originally necessary to design more dense low-resolution cameras to protect dead ends. Now, deploying high-definition network cameras Good choice.
3. The image quality is better, the so-called "details determine success or failure". High-definition network cameras have finer image details, especially for moving objects. Progressive scanning can provide us with a better image quality. The highest interlaced comb blur phenomenon is solved. Reliable image quality + details = reliable and fast investigation and analysis. The data stored in a large number of hard drives in such video are valuable image data, which is of great significance, such as license plates, face recognition and other applications. On the contrary, if the image quality is poor, the lack of details will undoubtedly bring great difficulties to the investigation and analysis.
A blackboard (also known as a Chalkboard) is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
A blackboard can simply be a board painted with a dark matte paint (usually black, occasionally dark green).Matte black plastic sign material (known as closed-cell PVC foamboard) is also used to create custom chalkboard art.Blackboards on an A-frame are used by restaurants and bars to advertise daily specials.
A more modern variation consists of a coiled sheet of plastic drawn across two parallel rollers, which can be scrolled to create additional writing space while saving what has been written. The highest grade blackboards are made of a rougher version porcelain enamelled steel (black, green, blue or sometimes other colours). Porcelain is very hard wearing, and blackboards made of porcelain usually last 10–20 years in intensive use.
Lecture theatres may contain a number of blackboards in a grid arrangement.The lecturer then moves boards into reach for writing and then moves them out of reach, allowing a large amount of material to be shown simultaneously.
The chalk marks can be easily wiped off with a damp cloth, a sponge or a special blackboard eraser usually consisting of a block of wood covered by a felt pad. However, chalk marks made on some types of wet blackboard can be difficult to remove. Blackboard manufacturers often advise that a new or newly resurfaced blackboard be completely covered using the side of a stick of chalk and then that chalk brushed off as normal to prepare it for use.
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