基于FPGA的多分辨率SDI传输系统设计

Design of multi-resolution SDI transmission system based on FPGA

为实现任意分辨率视频源SDI传输,设计了一种以可编程逻辑器件(FPGA)作为核心处理器的多分辨率自适应SDI传输系统。对系统所涉及的视频分辨率检测、多分辨率处理等相关方法进行了深入研究。首先,以实现4K(3 840×2 160P@60)传输系统为前提,利用四画面四路分割(SQD-Square Division)方法搭建了4K视频SDI传输系统。接着,加入分辨率检测模块,实现了多分辨率视频自适应接收功能。然后,设计了像素点填充模块和裁剪模块,使低于1 920×1 080P@60分辨率的视频均能统一成1 920×1 080P@60分辨率在SDI接口传输。经实验验证,该系统可实现多种分辨率视频的自适应传输,视频源类型包括但不限于4K(3 840×2 160P@60),1 920×1 080P@60,1 360×768P@60,1 280×720P@60,1024×768P@60等分辨率,使4K SDI传输系统具有更好的兼容性,突破了SDI接口仅可传输有限分辨率视频的局限。

In order to realize SDI transmission of any resolution video source,a multi-resolution adaptive SDI transmission system with programmable logic device(FPGA)as the core processor is designed. The video resolution detection,multi-resolution processing and other related methods involved in the system are deeply studied. Firstly,on the premise of realizing a 4K(3 840×2 160P@60)transmission system,a 4K video SDI transmission system is realized by using the SQD-square division method. Then,a resolution detection module is added to realize the multi-resolution video adaptive receiving function.Then,a pixel filling module and a cropping module are designed so that the videos with a resolution lower than 1 920×1 080P@60 can be unified into a resolution of 1 920×1 080P@60 and transmitted on the SDI interface. It has been verified by experiments that the system can realize adaptive transmission of videos of various resolutions. Video source types include but are not limited to 4K(3 840×2 160P@60),1 920×1 080P@60,1 360×768P@60,1 280×720P@60,1 024×768P@60 and other resolutions so that the 4K SDI transmission system has better compatibility,breaking through the limitation that the SDI interface can only transmit limited resolution video.