第18卷　第8期2010年8月　　　　　　　　　　　光学精密工程　Optics and P recisio n Engineering 　　　　　　　V ol .18　N o .8　A ug .2010　　收稿日期:2010-03-23;修订日期:2010-04-15.　　基金项目:中国科学院三期创新工程基金资助项目(No .O 93J32F090);国家自然科学基金青年基金资助项目(N o .60902067)文章编号　1004-924X (2010)08-1896-08基于数字域T DI 算法改进面阵C M OS 图像传感器功能曲宏松,张　叶,金　光(中国科学院长春光学精密机械与物理研究所,吉林长春130033)摘要:为使面阵CM O S 图像传感器具有T DI 成像功能,研究了T DICCD 的工作原理,提出了一种基于数字域的T DI 算法,并讨论了如何利用FPG A 实现该算法。该算法可在不改变CM O S 器件构造的前提下,使其具有时间延迟积分功能。通过举例法推导出面阵CM OS 图像传感器数字域T DI 计算公式,并在此基础上优化了算法结构,优化后可以节省(m -1)(m -2)/2行内存空间。最后以航天相机为背景,讨论了地面像元分辨力、行转移时间与CM OS 帧频的关系,通过一个算例计算出不同分辨力和积分级数条件下对CM OS 帧频的要求。计算结果表明,帧频大于648frame /s 的1280×1024CM O S ,可以满足600km 轨道高度下地面像元分辨力为1m 的96级积分成像要求。关　键　词:时间延迟积分;CM OS 图像传感器;数字域;帧频中图分类号:T N386.5　　文献标识码:A 　　doi :10.3788/O PE .20101808.1896Improvement of performance for CMOS area imagesensors by TDI algorithm in digital domainQ U Ho ng -song ,ZH ANG Ye ,JIN Guang(Changchun Institute of Optics ,Fine Mechanics and Physics ,ChineseAcadem y o f S ciences ,Changchun 130033,China )A bstract :In o rder to pro vide a TDI function for CMOS area image senso rs ,the w o rking principles of TDICCDs are researched and a TDI alg orithm based o n the digital domain is pro po sed ,then ,how to re -alize the alg orithm by a FPGA is discussed .The alg orithm can realize time delay integ ration on CMOS sensor s w itho ut changing its device structure .The TDI alg orithm fo r CMOS area image sensors in a digital domain is deduced through an example method .After optimization ,the algo rithm w ith opti -mized structure can save (m -1)(m -2)/2memo ry space of image lines .Finally ,on the basis o f a re -m ote sensing camera ,the dependence of pixel resolution and ro w transfer time o n frame rate is dis -cussed and the frame rate requirem ents under the G round Sample Distances (GSDs )and TDI stages are calculated by the numerical example metho d .Experim ent results sho w that the 1280×1024CMOS sensor with a frame rate more than 648frame /s can meet the requirem ents of integ ratio n imaging fo r 1m GSD of 96TDI stages in an orbital altitude of 600km .Key words :time delay and integ ration ;CMOS image senso r ;digital dom ain ;frame frequency

基于数字域TDI算法改进面阵CMOS图像传感器功能 - 曲宏松