基于SDRAM缓存的实时视频图像几何校正系统  

Real-time video image geometric correction system based on SDRAM cache

作　　者：陈文艺[1] 李龙龙[2] 刘禹韬 冯晨[2] 

机构地区：[1]西安邮电大学通信与信息工程学院,陕西西安710061 [2]西安邮电大学电子工程学院,陕西西安710061

出　　处：《电视技术》2016年第5期105-109,共5页Video Engineering

摘　　要：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。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.

关 键 词：FPGA SDRAM 实时几何校正 视频图像 

分 类 号：TN911.73[电子电信—通信与信息系统]