基于FPGA的光纖高清數字視頻傳輸系統(tǒng)的研究
發(fā)布時間：2019-04-19 09:39
【摘要】：本課題為視頻圖像大容量、高清、遠距離的傳輸提供了具體的設計方案,實現了單路VGA(或DVI)非壓縮高清視頻的實時化與數字化的傳輸。系統(tǒng)采用模塊化的設計方法,將整個系統(tǒng)劃分為：圖像采集模塊、FPGA處理模塊、圖像顯示模塊、光接口模塊等4個模塊組成。系統(tǒng)設計采用了信源編碼、時鐘恢復技術以及光纖通信技術,在保證系統(tǒng)功能性的同時增強了系統(tǒng)的可靠性。系統(tǒng)采用信源編碼技術,將行、場同步信號以及像素時鐘信號編碼插入到行消隱信號中發(fā)送,與傳統(tǒng)的FPGA+外部SDRAM方式相比提高了速度,也解決了需要大容量的外部SDRAM緩存的問題。系統(tǒng)針對不同圖像格式在傳輸過程中的快速切換的問題,利用Xilinx FPGA內部PLL動態(tài)配置的特點來設計同步時鐘的恢復,可以在2us左右恢復像素時鐘。測試結果表明：該系統(tǒng)能夠傳輸圖像的最高分辨率達到1280×1024@60Hz：傳輸圖像格式的切換時間延遲在2us以內,且切換速度快,圖像沒有延遲和拖尾現象,整個系統(tǒng)工作穩(wěn)定,實時傳輸視頻效果良好。
[Abstract]:This paper provides a concrete design scheme for large-capacity, high-definition, long-distance transmission of video images, and realizes the real-time and digital transmission of single-channel VGA (or DVI) uncompressed high-definition video. The whole system is divided into four modules: image acquisition module, FPGA processing module, image display module and optical interface module. The system design adopts source coding, clock recovery and optical fiber communication technology, which not only ensures the function of the system, but also enhances the reliability of the system. The system uses the source coding technology to insert the line, field synchronization signal and pixel clock signal into the line blanking signal for transmission, which improves the speed compared with the traditional external SDRAM mode of FPGA. It also solves the problem of large capacity external SDRAM cache. Aiming at the problem of fast switching between different image formats in the process of transmission, the system uses the characteristics of dynamic configuration of PLL in Xilinx FPGA to design the recovery of synchronous clock, which can recover pixel clock around 2us. The test results show that the maximum resolution of the system can reach 1280 脳 1024x60Hz. The switching time delay of the transmitted image format is less than 2us, and the switching speed is fast. There is no delay and trailing phenomenon in the image, and the whole system works stably. Real-time video transmission effect is good.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.11
本文編號：2460829
[Abstract]:This paper provides a concrete design scheme for large-capacity, high-definition, long-distance transmission of video images, and realizes the real-time and digital transmission of single-channel VGA (or DVI) uncompressed high-definition video. The whole system is divided into four modules: image acquisition module, FPGA processing module, image display module and optical interface module. The system design adopts source coding, clock recovery and optical fiber communication technology, which not only ensures the function of the system, but also enhances the reliability of the system. The system uses the source coding technology to insert the line, field synchronization signal and pixel clock signal into the line blanking signal for transmission, which improves the speed compared with the traditional external SDRAM mode of FPGA. It also solves the problem of large capacity external SDRAM cache. Aiming at the problem of fast switching between different image formats in the process of transmission, the system uses the characteristics of dynamic configuration of PLL in Xilinx FPGA to design the recovery of synchronous clock, which can recover pixel clock around 2us. The test results show that the maximum resolution of the system can reach 1280 脳 1024x60Hz. The switching time delay of the transmitted image format is less than 2us, and the switching speed is fast. There is no delay and trailing phenomenon in the image, and the whole system works stably. Real-time video transmission effect is good.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.11
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，本文編號：2460829
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