Under the current international financial crisis, video surveillance is one of the few industries that have grown against the market. Market research firm ABI Research predicts that there will be two types of electronic products that will continue to grow rapidly in 2009, including video surveillance, especially IP-based video surveillance applications. According to iSuppli, the revenue of China's security industry, which is closely related to video surveillance applications, will increase from $15.1 billion in 2007 to $24.7 billion in 2012.
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In fact, in 2008, the global video surveillance market achieved sales growth of 30% to 40%, mainly due to the continuous maturity of digital video surveillance technology and the government's investment in related industries such as the construction of safe cities. Traditional video surveillance equipment is concentrated in the financial, transportation, public facilities and other industries. As the price threshold of monitoring equipment is getting lower and lower, especially the large-scale application of wireless IP video, the future monitoring system will gradually expand to all walks of life and even families. user.
The current 3G mobile communication network has been deployed in large areas in major countries around the world. At the same time, WiFi hotspots are becoming more and more popular, and IP-based video surveillance applications based on wireless broadband are about to show a blowout trend. The wireless IP video surveillance network is flexible and convenient to construct, and can provide a personal solution for different target users, such as safe city, emergency command, environmental monitoring, SME monitoring, and home monitoring.
At present, wireless video surveillance products are one of the key directions in 2009, including the leading video surveillance design solutions providers such as Yiwei Dongfang and Hefei Youshi. In addition, in addition to the growing trend of wireless applications, with the scale and networking of monitoring applications, intelligence will be another inevitable trend in the development of video surveillance systems. A new generation of surveillance systems with intelligent analysis capabilities will greatly expand the application of video surveillance. In addition to traditional security applications, human behavior (off-line detection, flaw detection) and intelligent transportation will open up a large number of emerging application markets.
Blackfin solutions meet the higher functionality and performance requirements of wireless applications
Traditional video surveillance applications are based on industry users, using MCU+ASIC solutions. These video surveillance applications typically implement low-resolution video signal processing, basic control, and data transmission. Image quality is poor and functions are simple. With the advancement of video surveillance technology and the growing demand for applications, the trend toward higher video concepts, wireless IP connectivity, and intelligent analytics has made such applications less prone to performance.
The biggest difference between wireless transmission and wired transmission is that the wireless network bandwidth is unstable. The DSP-based scheme adopts the software implementation method, and can adjust the video size, code stream, frame number, etc. according to the bandwidth, and optimize the video compression algorithm for the characteristics of the wireless channel. Regardless of the network situation, video can be guaranteed to be smooth, unlike the mosaic and broken frames that are common in MCU+ASIC solutions. Wireless applications are usually more diverse due to the environment. The wireless module itself is also a large consumer of power consumption and heat dissipation. Even some mobile applications are battery powered, which has high requirements for low power consumption of the processor. The dual processor chip architecture of MCU+ASIC (or MCU+DSP) determines its power consumption is relatively high for wireless, especially mobile wireless applications.
In addition, with advances in technology, IP-based video surveillance is moving toward higher video experiences that include high-definition features, with the result that more complex algorithms and higher demands are placed on the processing power of the main chip. The traditional surveillance camera is based on the pixel resolution of the CIF format, and the compression standard complexity is low, so that the processing performance of the main chip is not high. However, with the rapid development of IP video surveillance and the advancement of related video standards, higher image resolution and higher frame rates, such as D1 (704 x 576) or higher, are expected. At the same time, with the popularity of wireless IP video surveillance, it is also necessary to consider how to occupy less bandwidth during the transmission process, so MPEG4 and H.264 are becoming mainstream. These higher video signal resolutions and compression formats greatly increase the processing power of the core processor. While traditional MCU+ASIC solutions require higher definition video, it is often necessary to add coprocessors.
In addition, a variety of intelligent functions such as face recognition, active object tracking, and human flow statistics have begun to be widely used commercially. For such specific applications that require intelligent image analysis, traditional solutions cannot perform the large amount of computational processing required for video analysis. Coprocessors must be added outside of MCU+ASICs. This complex solution is the cost of BOM. Power consumption or development difficulty is not enough. The requirements for networked and distributed processing of video surveillance systems, as well as cost, size and power constraints and non-standardized intelligent video analysis for large-scale engineering installations, make software design flexibility and powerful processing DSPs More obvious advantages.
However, although pure DSP processors have very flexible processing methods and graphics processing functions are relatively powerful, they usually take up more space because they usually use traditional signal processing architectures instead of optimized for video surveillance. The system resources are also uncompetitive for some applications with higher control functions and higher code rates.
The convergence processor represented by Blackfin effectively solves the above problems and brings good news to wireless IP video surveillance applications and intelligent video surveillance applications where audio and video standards are constantly changing and algorithms are constantly improving. Based on the Micro Signal Architecture (MSA) jointly developed by ADI and Intel, the Blackfin processor combines a 32-bit RISC instruction set with dual 16-bit multiply-accumulate (MAC) signal processing with a general-purpose microcontroller. Use sex together. This combination of features enables the Blackfin processor to perform well in both signal processing and control processing applications, combining the advantages of MCUs and DSPs, greatly simplifying hardware and software design implementation tasks. Blackfin processor-based solutions use software to implement video compression algorithms, enabling manufacturers to adapt to evolving standards, different customer needs, and meet new functional requirements without changing hardware.
The Blackfin processor represents the new 16/32-bit embedded processor, and its unique architecture and built-in four 8-bit video ALUs and unique instructions defined for video applications are very efficient at handling industry-standard video algorithms. Wireless IP video surveillance applications that require convergence processing capabilities. Blackfin's dozens of DMA channels and flexible configuration caches are well suited to the high computational throughput and high data throughput requirements of video surveillance systems. The ten-stage pipeline enables Blackfin to have strong command parallel execution capabilities. In addition, Blackfin supports more than a dozen embedded operating systems such as ThreadX, Nucleus, uCOS-II and uCLinux, providing customers with a familiar software architecture foundation. Designed for high-intensity, high-data-rate digital and media processing, Blackfin is the ideal video processor with a high price/performance ratio.
In addition, its low power consumption is ideal for compact IP cameras and battery-powered or mobile wireless IP video surveillance applications that are very sensitive to power consumption. The Blackfin processor uses a variety of power-saving technologies: based on a gated clock core design that selectively cuts off power to the functional unit on a per-instruction basis; supports multiple power-down modes for periods of minimal CPU motion; Blackfin The processor supports a self-contained dynamic power management circuit with which the operating frequency and voltage can be independently controlled to meet the performance requirements of the executing algorithm; most Blackfin processors provide on-chip core voltage regulators, and It can operate at voltages as low as 0.8V. Blackfin's unique convergent processing architecture and 90nm process have laid the foundation for its leading low-power processing, providing the best performance-to-power ratio for wireless IP video surveillance products.
It is worth mentioning that, whether it is CDMA or 3G modules, the wireless channel bandwidth is narrower and the code rate is lower than that of the wired network. The low bit rate video encoder performance is one of the biggest challenges. In the current DSP, SoC, ASIC and other solutions on the market, although there are many schemes for supporting large-size high-stream compression such as D1 and even 720P, there are few solutions that can support low bit rate (tens to hundreds of Kbps). High quality video encoder or software library. ADI has been working on this aspect for a long time and has obtained algorithmic results for actual products. It has already supported third parties to successfully develop a complete solution based on Blackfin.
Typical application case analysis
Application Case 1: Hefei Youshi Technology 3G Wireless Video Surveillance Product Solution
BVWVS2007 3G wireless video surveillance solution of Hefei Youshi Embedded Technology Co., Ltd. (referred to as Hefei Technology) is a mature product of the company. The program provides rich functional features and is a complete and mature product of wireless video surveillance cameras. The solution uses a powerful dual-core ADSP BF561 processor.
With the advantages of parallel processing becoming more and more obvious, multi-core architecture has become the industry's recognized mainstream embedded processor in the future, and BF561 is such a model, the processor has become a wide range of high-end applications including wireless IP video surveillance. select. The BF561 features two high-performance DSP cores, a flexible cache architecture, and an enhanced DMA subsystem for complex control and signal processing tasks while maintaining high data throughput. In addition, the Blackfin processor's dynamic power management capabilities significantly reduce overall power consumption – a key importance for battery-powered products with the BVWVS2007 solution. The BF561 processor enables Hefei's BVWVS2007 solution to achieve advanced features such as variable resolution and target tracking, while also attracting bill of materials costs due to its high performance and high integration. In this scheme, the dual core of BF561 is used to realize the running of uClinux embedded operating system, user interaction control and video coding algorithm. The scheme realizes two-way video compression coding by H.264 encoding under CIF resolution. The dual stream, one low stream is used for wireless video transmission, and the other high stream is stored locally to the SD card / NAND / SATA hard drive, giving full play to the dual core performance advantages of the processor. In a typical narrowband transmission application system such as wireless video surveillance, Blackfin's H.264 encoder is the core competitiveness of the excellent image compression performance under the low bit stream of 30~100kbps.
For the high-volume mid-range video security surveillance market, price/performance is the most critical factor. The BF561 processor combines the dual-core digital signal processing and control processing on a powerful single chip, which not only meets the performance goals of the product, but also improves the cost performance of the solution. At present, the company can provide a variety of mature wireless video surveillance solutions for customers' needs, including complete solutions for H.264 video surveillance for single-channel CDMA, EV-DO, EDGE, TD-SCDMA, WCDMA and WiFi wireless LANs. 4-way bus mobile monitoring DVR/DVS system solution. With the growing demand for video security surveillance in China, Hefei's BVWVS2007 solution can help Chinese wireless video surveillance manufacturers quickly introduce mature and stable advanced product solutions based on Blackfin processors.
Figure 1: Block diagram of Hefei's ADSP BF561-based system solution.
Huang Ning, Marketing Manager of Hefei Youshi Technology Co., Ltd.: "The Blackfin processor enables Hefei's products to achieve advanced features such as variable resolution and target tracking, and provides the necessary H. 264 video compression coding, dual stream, transmission and storage, and because of high performance and high integration, it is also very attractive in terms of bill of materials cost."
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