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超分辨率图象重构技术的仿真实验研究
引用本文:刘良云,李英才,相里斌.超分辨率图象重构技术的仿真实验研究[J].中国图象图形学报,2001,6(7):629-635.
作者姓名:刘良云  李英才  相里斌
作者单位:刘良云(中科院西安光机所空间室,西安 710068)       李英才(中科院西安光机所空间室,西安 710068)       相里斌(中科院西安光机所空间室,西安 710068)
基金项目:中国科学院西安光机所所长基金资助项目
摘    要:CCD相机在对空间频率较丰富的景物进行成象时,由于CCD象元尺寸的限制,图象分辨率低,混频现象有时很严重,红外相机尤其如此,超分辨率图象重构技术利用多帧重复拍照图象的冗余信息,重构出超分辨率图象,消除和降低混频效应,本文对图象微位移和微旋转角的精确估算算法,相机模型,超分辨率较象的重构算法等关键技术进行研究,设计了序列了集共轭梯度最优化算法,并提供了分辨率提高5倍的算法和研究成果,该项技术对于星载,机载图象融合(特别是红外凝视成象系统获取的图象)是十分有意义的,它将有可能将航天或航空图象的分辨率提高2-5倍左右。

关 键 词:亚象元  图象重构  超分辨率  图象配准  仿真  CCD相机  图象处理
文章编号:1006-8961(2001)07-0629-07
修稿时间:2000年1月26日

Super-Resolution Image Reconstruction and its Simulated Experiment
LIU Liang yun,LI Ying cai and XIANG LI Bin.Super-Resolution Image Reconstruction and its Simulated Experiment[J].Journal of Image and Graphics,2001,6(7):629-635.
Authors:LIU Liang yun  LI Ying cai and XIANG LI Bin
Abstract:Some imaging systems employ detector arrays that are not sufficiently dense to meet the Nyquist criterion during image acquisition. This is particularly true for infrared digital imagers. Therefore, the spatial resolution afforded by the optics can't be fully utilized in such imaging systems. This paper presents a new technique to reconstruct a high resolution image, with reduced aliasing, from a sequence of under sampled rotated and shifted frames of the same object. Firstly, the continuous and digital models of an imaging system are defined to explain image acquisition. Secondly, the image registration algorithm and the ordered subset conjugate gradient (OSCG) reconstruction algorithm are designed. Finally, Simulated experiment results are provided to test our algorithm, and we obtain the image whose resolution is 5 times high than the 25 under sampled frames. The results show that OSCG reconstruction algorithm is robust, rapid convergent, and memory saved.
Keywords:Sub  pixel  Image reconstruction super  resolution  Image registration
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