一种高保真同态滤波遥感影像薄云去除方法.PDF

2011. 1 遥感信息 一种高保真同态滤波遥感影像薄云去除方法 , 李洪利 , 沈焕锋 , 杜博 , 吴柯 ( , 430079; , 430079; , 430079; , 430074) : 同态滤波是一种常用的遥感影像薄云去除方法, 但传统方法在抑制薄云对应的低频区 时, 会不可避 免地改变非云区的辐射信息本文提出一种高保真遥感影像薄云去除方法, 在同态滤波框架内利用基于区 模 板的检测方法进行云区判别,处理时仅对云区用同态滤波结果进行替换, 无云区则保留原始影像的亮度值为进 一步提高影像的保真度,影像拉伸处理时进一步剔除了云区对拉伸系数的影响实验结果表明, 本文方法能够在 有效去除薄云的同时保留非云区的辐射信息, 具有高保真特性 : 同态滤波; 云区判别; 区 模板; 去薄云 doi:10. 3969/ j. issn. 1000- 3177. 2011. 01. 008 : TP79 : A : 1000- 3177( 2011) 113- 0041- 04 A Highfidelity Method of Removing Thin Cloud from Remote Sensing Digital Images Based on Homomorphic iltering , LI H ongli , SHEN H uanfeng , DU Bo , WU Ke ( StateK ey L aboratory Inf ormation E ngine Surveying Mapp ing of Wuhan University, Wuhan, 430079 School of Resources and E nv ironmental Sciences of Wuhan Univ ersity , Wuhan, 430079 omp uter School of Wuhan University, Wuhan, 430079 Institute of Geop hysics A nd Geomantic of hina Univ ersity of Geosciences, Wuhan, 430074) Abstract:The tra it ional homomorphic filt ering frequently use in the clou removing has effect on the clou in lowfre quency region, but the tra itional metho use to remove thin clou in t he area of low frequency inevitably changes the region informat ion. This article suggests a highfi elity metho of removing thin clou from igit al remote sensing images, which is base on t he metho s of regional template for the istrict ju ge after homomorphic filtering . After filtering only replace the clou region to the result of homomorphic filtering but unclou region still keeps the original ata. To furt her enha