基于FPGA的视频源无缝切换系统设计  

Design of a seamless video switching system based on FPGA

作　　者：周家耀 张俊杰[1] 李正璇 Zhou Jiayao;Zhang Junjie;Li Zhengxuan(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学特种光纤与光接入网重点实验室,上海200444

出　　处：《电子测量技术》2020年第15期112-118,共7页Electronic Measurement Technology

摘　　要：显示设备在切换视频源时,画面会发生黑屏。解决视频切换导致的黑屏,是目前视频无缝切换技术的研究意义。针对现有的无缝切换技术存在的问题,基于FPGA提出一种视频源无缝切换方案。固定输出端的视频格式,对输入端视频进行缩放,使输入输出视频格式一致;设计多帧视频缓存,自适应调整视频帧率,与同步信号匹配输出。该设计优化了双线性插值图像缩放算法的硬件结构,实现480P、720P到1080P的视频实时缩放。实验结果表明,该设计消除了视频切换导致的黑屏;图像缩放后的质量,与MATLAB实现缩放质量相比,PSNR值为41.6 dB。在XC7A100T芯片上,资源占用不到40%,具有低成本、实时性好、可靠性高的特点,在电视转播、影视制作、安防等领域具有实际的应用价值。When the display device switches video sources,the screen will be blank.Solving the black screen caused by video switching is the research significance of current video seamless switching technology.Aiming at the problems of the existing seamless switching technology,a seamless video switching solution based on FPGA is proposed.By fixing output video format,scaling the input video to the same size,and buffering several video frames to match the output sync signal,seamless video switching can be achieved.This design optimizes the hardware structure of the bilinear interpolation image scaling algorithm so that it can realize real-time scaling of video from 480 P,720 P to 1080 P.The results show that the design eliminates the black screen caused by video switching.Compared with MATLAB’s scaling image quality,the PSNR value is 41.6 dB.On the XC7 A100 T FPGA,resources occupy less than 40%.The design has the characteristics of low cost,good real-time performance and high reliability.It also has practical application value in the fields of television broadcasting,film and television production,and security.

关 键 词：视频无缝切换 双线性插值 FPGA 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TN791[自动化与计算机技术—计算机科学与技术]