广角镜头图像畸变校正系统的研究

Real-time system designed for distortion-correction in wide angle lens

介绍了一种广角镜头图像畸变的实时校正系统。通过对光学系统畸变原理的分析,采用一定的算法对像素空间的位置进行几何变换,减少了由镜头大视场带来的几何畸变。整个系统以FPGA为核心控制器件,结合数字图像编码解码芯片和SDRAM存储器,可实现视频图像的实时校正。时钟倍频器在系统中可以为SDRAM及其控制模块提供与其它时钟同相位的高频时钟。

A kind of real-time system which designed for distortion-correction in wide angle lens is introduced. A certain algorithm is used to get the proper vertical coordinate and horizontal coordinate of every pixel according to the analysis of distortion.The implementing method and the circuits are also shown. By taking the FPGA as the key component, the system combined with the digital video encoder and decoder can eliminate the image distortion. The clock multiplier provides the SDRAM, and it's controller module with a triple- frequency clock which features zero delay.