HD-SDI CCTV and IP CCTV
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In recent years, closed-circuit monitoring equipment has been dominated by high-definition digital devices, and high-definition digital devices have become the mainstream in the video surveillance industry. Recent reports indicate that by 2016, more than 45% of surveillance camera shipments will be based on digital technology. Approximately 35% of all cameras will support resolutions up to 1080@30p.
As more and more high-definition (HD) digital security cameras are introduced in the market, CCTV manufacturers are looking to differentiate and launch unique sales propositions based on their HD resolution products. Features that these vendors should support include: monitoring a wider area (using HD format); excellent image clarity and high color reproduction; high frame rate (supporting 1080@60P); utilizing advanced edge analysis programs; and thermal images deal with.
This article will review key factors affecting the CCTV surveillance market, focusing on digital technologies that deliver high-definition images and advanced monitoring capabilities.
HD-SDI CCTV
The High Definition Serial Digital Interface (HD-SDI) transmits video according to the SDI Broadcasting Standard established by the SMPTE Association. In the CCTV market, HD-SDI can deliver high-definition images over existing RJ59U analog infrastructure or high-end coaxial cables such as RJ6 or RJ11.
When referring to "simulation", it often refers to the "standard" resolution: not 640 x 420 4CIF, which is D1 at 720 x 486 resolution.
HD-SDI supports 1280×720p or 1920×1080p real-time HD resolution at 30fps (frames per second). At the CCTV trade show in 2011 and 2012, a large number of manufacturers exhibited HD-SDI cameras.
Coaxial HD technology has a bright future, and this technology reflects the growing demand for uncompressed HD technology.
IP CCTV
IP cameras spread real-time video streams through digital packets across the LAN or the Internet. This means that people can remotely access video streams and remotely store via smartphones, tablets or other network devices.
IP CCTV systems do not require local recording and can transfer images over a local network or the Internet, as well as record, view and manage images. The IP camera delivers tens of thousands of pixels of high detail accuracy, at least 3 times better than standard analog cameras. In addition, IP CCTV cameras do not require a separate power supply, support POE (powered over Ethernet), and can be powered via a network cable. Another benefit is that IP systems support direct use of standard IP-based services such as sending e-mail or images via FTP.
IP-based solutions have their advantages, but latency is a key factor when it comes to real-time high frame rate video images. Other HD cameras produce IP-free or smooth uncompressed images at a frame rate of 30 images per second when using HD-SDI or uncompressed digital CCTV in a LAN solution.
LAN-based uncompressed digital closed circuit television
Based on HDBaseT technology, CCTV solutions deliver uncompressed HD video, audio, power and control signals. It uses a standard 150 meter long LAN (cat5e/cat6a) cable.
HDBaseT is a well-known standard in the professional AV and consumer electronics markets. It is used to transmit high-definition multimedia content over long distances. The technology was developed by the HDBaseT Alliance, which was founded by LG, Samsung, Sony Pictures and Valens Semiconductor. The uncompressed digital CCTV on the LAN utilizes the successful HDBaseT technology to provide the same simple, affordable and high quality products for the CCTV market.
The HD-SDI RG-59U coaxial cable is limited to 100 meters long, and IP will have real-time image distortion. The HDBaseT solution provides up to 150 meters of connecting cable on the same equipment as the IP solution, enabling the expansion and simple movement of IP CCTV systems.
In all uncompressed technologies, when a video image is to be recorded into a DVR, the recorder needs to convert the uncompressed image to H.264 or a similar format, otherwise the recording data transfer rate will be high.
So far, all the techniques discussed in this paper are techniques for transmitting video image data. So, what are the market factors that trigger these technologies? What are the technical requirements for the CCTV market? The following sections will try to solve some of these problems.
CCTV monitoring project cost case
Industry development and technological progress
Some industries that are rapidly evolving (for example, transportation, retail, or banking) are driving demand for high-end CCTV products. For example, the transportation system has to become an "intelligent transportation system", the train has to become a high-speed train, and the airport has to accommodate more passengers. These systems require high quality CCTV products and applications.
The demand for high-definition images is increasing, which accelerates the conversion of analog systems to IP/network systems or uncompressed high-definition digital devices. The simulation market has reached saturation point. On the life curve of the product, the analog camera may be at the peak of its maturity; it will be replaced by an IP camera or other digital product.
Some large cities began to build urban security projects in 2000. Later, these projects have gained momentum in the global development. It is estimated that in 2016, 3 million cities will build CCTV security systems.
The goal of all CCTV technology is to penetrate the existing analog market and guide current market players to digital technology. Of course, all of these technologies require vendor interactivity and compatibility. This ecosystem can only be achieved by using a single, widely adopted standard.
High-definition digital cameras transmit uncompressed HD video with high storage requirements and costs. Uncompressed HD numbers If you want to enter the mainstream analog procurement market, the storage price must be favorable.
Manufacturers need to be familiar with different technologies in order to give the right solution for each situation. The positioning of uncompressed HD digital products is a potential replacement for analog products, and the positioning of IP/network-based video surveillance solutions is the best solution for large-scale deployments in existing enterprise network environments. But is this the right way?
CCTV monitoring project cost case
CCTV systems using HD-SDI technology (eg uncompressed HD based on coaxial cable); CCTV systems using HDBaseT technology (eg LAN-based uncompressed HD); IP/network CCTV systems.
The system requirements for the new CCTV installation of the New Central Bank Headquarters Building include: Full HD 1080@30fps, 100% coverage; real-time on-site viewing, total system delay below 150ms; 24/7 security coverage; stable and reliable system (safe Data); advanced video analytics to trace suspicious activity; integrated as part of a larger surveillance system (low bandwidth control, transferring images over existing ADSL networks to remote locations); simple routine maintenance (easy to install and use). CCTV equipment requires 89x HD DVR, 89 HD camera and WKC-100 (CMS center key controller). Figure 1 illustrates the layout of CCTV projects at the central bank location.
The most effective solution is a new uncompressed CCTV deployed on a LAN solution: about 20% cheaper than HD-SDI, 37% cheaper than IP; future-proof design supports up to 1080@60fps Compress image distribution.
Two uncompressed technologies (via LAN and coaxial cable) provide a reliable solution: they all use a simple installation (coaxial cable or CATx), and the HDBaseT-based solution also uses the current IP infrastructure, and Support for future migration to IP; they all reduce the point of failure across the installation path (no network equipment required); better uncompressed image performance with better color reproducibility, enabling low latency and high frame rate transmission .
In the medium-sized project of the above example (with 50 to 350 HD cameras), the advantages of using uncompressed high-definition digital technology are its excellent reliability, favorable installation and equipment costs, and excellent performance.
Depending on the situation of different CCTVs, the break-even point of choosing an IP-based solution lies in the deployment of large enterprises (with more than 500 cameras). In such projects, closed-circuit television networks are often combined with enterprise networks, or at least share the enterprise's Ethernet infrastructure (such as existing routers and switches).
summary
The closed-circuit television surveillance market is growing rapidly and is expected to reach $20.5 billion by 2016. The speed of development is mainly due to the conversion of traditional analog video equipment to high-definition equipment based on network or uncompressed high-definition digital technology.
Today, most users (whether existing or new customers who want to upgrade their systems) and CCTV manufacturers are investing in HD products and applications. As a result, the product has been converted from standard definition to high definition/megapixel devices. However, the use of uncompressed HD digital or network-based products is primarily affected by the overall cost of the solution. The price of IP-based solutions is still significantly higher than the price of "comparable" uncompressed HD digital solutions.
Network equipment installers with higher average selling price (ASP) for medium-sized CCTV projects (as shown in Table 1, with up to hundreds of cameras on upgraded simulation sites or new sites) are more willing to invest in uncompressed HD digital Devices such as HDBaseT-based or HD-SDI-based devices achieve superior performance with less investment cost.
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