基于SDRAM缓存的实时视频图像几何校正系统

采用基于后向映射查找表结构的几何校正算法,结合双线性插值算法和SDRAM的时序特性,利用FPGA内部存储资源设计了一个特殊的Cache来缓存图像数据,等效实现了对SDRAM缓存图像四邻域像素的快速随机读取.该方法处理延时小、实时性强、成本低,可实现高分辨率视频图像的实时几何校正,对不同畸变视频图像校正,只需修改映射查找表.

The real-time Video Image Geometric Correction System based on SDRAM Cache

This design uses an algorithm of mapping lookup table architecture for geometric correction,combining with the bilinear interpolation algorithm and the timing characteristics of SDRAM,a special Cache is designed to cache the image data using the RAM resource in FPGA.It is equivalent to achieve a fast random access to the four neighborhood pixels of the SDRAM cache image.This method has the advantages of small processing time delay, strong real-time and low-cost,it can achieve real-time geometric correction of high resolution video images,it only needs to modify the mapping table for the correction of different distorted video images.