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Based on the design of the video image of the FPGA four Quad

Author: XueXiaoJun
Tutor: XuJiangChun
School: Kunming University of Science and Technology
Course: Detection Technology and Automation
Keywords: FPGA network transmission 4 channel video multiplexer
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 107
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Abstract


In recent years,with the wide application of the video surveillance system in various fields, the application of the channel video multiplexer as one of the system components is also more common.For example, video switches are often used in television monitoring systems which are comprised of multiple cameras, to make multiple images display in rotation on a single monitor. But sometimes in order to allow monitoring personnel can simultaneously see all monitoring spots, channel video multiplexers are often used to make multiple images display simultaneously on a monitor. In this way, not only reduce the number of monitors, but also enable the monitoring personnel at a glance to monitor all parts of the situation. Such as using a 4-channel video multiplexer, you can monitor four different scenarios at the same time on a single monitor, but only one VCR is simply used to save the data on the four real-time video at the same time.This paper presents and designs a four-channel video data system of reception, extraction, display and switch based on the FPGA devices and embedded operating systemsμClinux, brings to the idea of modular functional units design,utilizes the technology of SOPC hardware and software co-development, applies QuartusⅡ, NiosⅡIDE, etc,which are the popular software of embedded development at present, as well as the most extensive IP network.The features of this design are as follows:1、The modules of buffer and display are wroten by the hardware description language Verilog in this paper,and linked to the Avalon bus. IP Cores which are relatively independent and re-used, with small occupied area, high speed operation and low consumption, so that the whole system adds IP Cores can improve the operating speed and reduce consumption.2、Give full play to the SOPC Builder. To rapidly build the hardware system, CPU, memory, network interface and other equipments are added by the SOPC Builder in this paper.3、The Development board DE270 added in the embedded operating systemμClinux in the paper. Becaused of the networking features of the embedded operating systemμClinux,the vidio data can be received by IP network.4、In the NiosⅡIDE environment through the C programming language method to achieve the function of single frame and four frames which are still image display.5、To achieve the functions of resolution conversion, switching displayof real-time video image data, the algorithm in the NiosⅡIDE environment is transplanted to the operating systems ofμClinux and joine the algorithms of image processing.6、The system is running like this:First, it receives the video data packets, which are 640x480 resolution and RGB format coming from the four cameras in front-end through the router on network, and extractes 320x240 resolution respectively, then displays the four images simultaneously at the four specified locations on VGA. According to the requirement of displaying, it could select any one of four images using the switches, and display them in the form of full screen view, that was to say, switching and displaying them between 640x480 and 320 x240. Eventually it completes the design of 4-channel video multiplexer.7、The traditional video segmentation and controlling were achieved by the complex video matrixes and PC control machines, but IP routing and operating system were used to achieve in this paper, so that the cost of the overall system has been reduced and the complexity of operations has been simplified, and the flexibility and the scalability of the system have been greatly expanded.The design can be used to occasions such as factories, banks,residential area,and so on where have surveillance devices. It has broad market prospect and application value.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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