基于投影修正和POCS的图像超分辨率重建  

Image reconstruction with super-resolution based on projection modification and POCS

作　　者：杨欣[1] 唐庭阁[1] 费树岷[2] 周大可[1] 

机构地区：[1]南京航空航天大学自动化学院,江苏南京210016 [2]东南大学自动化学院,江苏南京210096

出　　处：《江苏大学学报（自然科学版）》2013年第5期564-568,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(60905009;61172135;61101198);高等学校博士学科点专项科研基金资助项目(20093218120015);中国科学院遥感应用研究所;北京师范大学遥感科学国家重点实验室开放基金资助项目(2009KFJJ012);南京航空航天大学基本科研业务费专项科研项目(NS2010081)

摘　　要：针对超分辨重建技术中传统POCS图像重建算法存在的Gibbs效应问题,提出一种采用投影修正机制抑制Gibbs效应的图像超分辨率重建算法.首先针对初始图像采用方向差分方法获得图像的边缘约束算子;随后在每一次的迭代重建过程中,结合前后重建结果的差值和边缘约束算子设计投影修正算子,并对残差阈值和点扩散函数分别进行修正,从而获得修正后的数据一致性投影过程;最后利用修正的投影过程获得最终重建图像.试验结果表明:改进算法具有较好的峰值信噪比,并且有效抑制了Gibbs效应,具有较好的应用前景.To solve the Gibbs artifacts in traditional POCS algorithm for image reconstruction in super- resolution technology, an algorithm was proposed based on projection modification. An edge constraint operator was obtained by dealing with the initial image based on direction-difference method. Combining the edge constraint operator with difference between prior and current reconstruction results, the projec- tion modification operator was used to modify the residual threshold and point spread function at each ite- ration process. The data consistency projection process was modified to reconstruct the high-resolution image based on the improved algorithm. The experimental results show that the improved algorithm has good peak signal to noise ratio （PSNR） with effective restraint to the Gibbs artifacts.

关 键 词：图像重建 超分辨率 图像增强 凸集投影 Gibbs现象 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]