嵌入式圖像采集和遠(yuǎn)程傳輸系統(tǒng)的設(shè)計(jì)
[Abstract]:In today's information age, with the increasing awareness of security, video surveillance system has been widely used in all walks of life. As an important branch and component of the surveillance industry, embedded network video surveillance system plays an important role.
In this design, the programmable SOPC (Syetem On Programmable Chip), a new embedded technology, is applied to the remote image monitoring system. The advantages of high-speed parallel computing ability of hardware circuit and flexible software control are brought into full play. It not only improves the integration and stability of the system, but also improves the image acquisition and processing. Processing speed.
Firstly, the system uses Verilog Hardware Description Language to complete the function modules of image acquisition and storage, which are complicated and time-consuming. The network card controller and image acquisition controller are designed by using the IP core customized by this system, and are coordinated by Verilog language and C language based on Nios II soft core, so that image acquisition can be realized. The image compression algorithm of this system adopts JPEG standard, and optimizes the discrete cosine transform (DCT) in the process of JPEG coding.
Secondly, using the MicroC/OS-II operating system which has been transplanted by Altera's Nios II processor as the software platform, the system transplants the LWIP protocol stack, develops the DM9000A network card driver, and uses the standard socket interface to communicate with the network through Ethernet, thus realizing the network real-time monitoring function.
On the basis of determining the structure and function of the system, the paper compares and analyzes various embedded schemes which can realize the monitoring function, and then determines the overall design scheme and framework of the system; then it analyzes the principles and implementation methods of image acquisition, image caching, JPEG image compression algorithm optimization and image bitstream Ethernet transmission. At last, the overall design flow of the system software is given. Finally, the main function modules of the system are simulated and tested, and the verification results are given. The experimental results show that the system is real. Now we have the functions of image acquisition, compression and Ethernet transmission.
【學(xué)位授予單位】:哈爾濱理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類(lèi)號(hào)】:TP368.1;TP391.41
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