顾及水域的QuickBird影像阴影检测方法研究
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摘要
针对城市高分影像中阴影检测不准确以及水体影响阴影检测的问题,结合影像各波段灰度值特征,改进一种基于多波段灰度值差异的阴影自动检测方法。首先,分析阴影与非阴影在不同波段的灰度值差异,进行波段组合,通过建立的波段组合构造多波段阴影指数MSI以增强阴影信息得到疑似阴影区域;然后,在归一化水体指数NDWI的基础上根据比值法原理构造水体指数WI加大水体与其他地物的差异性,得到水体区域;最后,通过形态学滤波算法对检测结果进行后处理并结合布尔运算得到影像中较完整的阴影区域。实验结果表明,该方法能够准确区分影像中的阴影与水体,准确提取影像中的阴影区域。
Aiming at the problem of inaccurate shadow detection in urban high resolution images and the shadow of water body effects detection and combined with the band digital number characteristics of the images,a method of automatic shadow detection based on multi-band digital number difference is improved.First,it analyzes the digital number difference between the shadow and non-shadow,executes the bands change,and constructs a multi-band shadow index by creating a band combination to enhance the shadow information to get a suspected shadow area.Then,on the basis of the normalized difference water index,it constructs the water index according to the principle of the ratio method to increase the difference between the water and other objects,and getts the water area.Finally,the morphological filtering algorithm is used to post-process the detection result,and combines the Boolean operation to get the entire shaded area in the image.Experimental result shows that the detection method in this paper can distinguish the shadow and water in the image accurately,and extract the shaded area in the image precisely.
Aiming at the problem of inaccurate shadow detection in urban high resolution images and the shadow of water body effects detection and combined with the band digital number characteristics of the images,a method of automatic shadow detection based on multi-band digital number difference is improved.First,it analyzes the digital number difference between the shadow and non-shadow,executes the bands change,and constructs a multi-band shadow index by creating a band combination to enhance the shadow information to get a suspected shadow area.Then,on the basis of the normalized difference water index,it constructs the water index according to the principle of the ratio method to increase the difference between the water and other objects,and getts the water area.Finally,the morphological filtering algorithm is used to post-process the detection result,and combines the Boolean operation to get the entire shaded area in the image.Experimental result shows that the detection method in this paper can distinguish the shadow and water in the image accurately,and extract the shaded area in the image precisely.
引文
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[15]徐涵秋.利用改进的归一化差异水体指数(MNDWI)提取水体信息的研究[J].遥感学报,2005,9(5):589-595.
[16]杨树文,李轶鲲,刘涛,等.基于SPOT5影像自动提取水体的新方法[J].武汉大学学报(信息科学版),2015,40(3):308-314.
[2]张珩.高分影像建筑物阴影检测方法及其高度反演研究[D].成都:西南交通大学,2017.
[3]杨兴旺,杨树文,刘正军,等.资源三号影像中城市高大地物阴影检测方法[J].测绘科学,2015,40(9):98-101.
[4] POLIDORIO A M,FLORES F C,IMAI N N,et al.Automatic Shadow Segmentation in Aerial Color Images[J].2003:270-277.
[5]虢建宏,田庆久,吴昀昭.遥感影像阴影多波段检测与去除理论模型研究[J].遥感学报,2006,10(2):151-159.
[6]周家香,朱建军,张红亚.基于C1C2C3彩色不变特征的阴影检测与辐射恢复研究[J].工程勘察,2007(6):52-54.
[7]杨俊,赵忠明,杨健.一种高分辨率遥感影像阴影去除方法[J].武汉大学学报(信息科学版),2008,33(1):17-20.
[8]徐秋红,叶勤.一种基于颜色恒常性理论的城市高分辨率遥感影像阴影消除方法[J].遥感信息,2010(4):13-16.
[9]武丹,刘涛,杨树文.资源三号卫星高分影像的城市建筑物阴影提取[J].测绘科学,2017,42(6):190-195.
[10]马友平.基于Matlab的快鸟影像主成分处理研究[J].矿山测量,2009(5):28-30.
[11]刘亚岚,许清,郑泽忠,等.典型地震次生地质灾害多光谱遥感影像特征图谱研究[J].遥感技术与应用,2015,30(1):18-24.
[12]McFeeters S K.The use of normalized difference water index(NDWI)in the delineation of open water features[J].International Journal of Remote Sensing,1996,17(7):1425-1432.
[13]周艺,谢光磊,王世新,等.利用伪归一化差异水体指数提取城镇周边细小河流信息[J].地球信息科学学报,2014,16(1):102-107.
[14]曹凯,江南,李新国,等.基于SPOT-5图像的城市水体自动提取模型研究[J].国土资源遥感,2005(4):24-27.
[15]徐涵秋.利用改进的归一化差异水体指数(MNDWI)提取水体信息的研究[J].遥感学报,2005,9(5):589-595.
[16]杨树文,李轶鲲,刘涛,等.基于SPOT5影像自动提取水体的新方法[J].武汉大学学报(信息科学版),2015,40(3):308-314.