一种基于FPGA的视频几何校正系统设计方案

Design of video geometric calibration system based on FPGA

为了满足大视场相关应用、尤其是大屏幕投影拼接技术应用领域对视频图像实时几何校正的要求,本文对视频图像的实时几何校正及其FPGA实现方法进行研究。首先,根据图像几何校正理论基础,利用Matlab等工具进行算法模拟仿真,确定了视频图像实时几何校正系统的基本框架。然后,根据现有的硬件平台DE2的硬件资源情况,细致规划系统结构,并对其中的核心部分几何校正模块进行仿真。最后,通过实际校正测试,断定实验结果达到视频图像实时几何校正的预期效果。实验结果表明:几何校正后,投影仪投射出的图像符合仿真结果,系统延时小于10个时钟周期,远小于毫秒级,且延时恒定,校正误差不超过1个像素。此方案达到了预期视频图像实时几何校正的效果,具有相当的借鉴、参考意义。

In order to realize the real-time video image geometric calibration in large field of view image applications,especially in large format proj ection mosaic technique field,this paper analyzes the video image geometric calibration and its realization based on FPGA.First,according to the basic theory of image geometric calibration,this paper describes the simulation of algorithms with Matlab and other tools,and designs the basic frame of the video image geometric calibration system.Then,the system structure is detailed designed based on the hardware resources of DE2 platform and the geometric cali-bration module is simulated.Finally,based on the actual calibration test,this paper concludes that the experimental results achieve the desired target of real-time video image geometric calibration.Ex-perimental results show that the image which has been calibrated and proj ected by proj ector is consistent with the simulation results.The delay of system is less than 10 clock cycles,far less than millisecond level,and the value of delay time is a constant.The inaccuracy of the calibration system is no more than one pixel.This design achieves the desired target of real-time video geometric calibra-tion,which has considerable significance for reference.