摘要
分类法提取建筑物因易受到错误检测的影响而存在边缘锯齿、形状不规则等问题。提出了一种利用符合建筑物轮廓及轴向的最佳外接矩形和Hausdorff距离综合优化建筑物轮廓的方法。首先利用偏移阴影分割分类方法提取建筑物,对建筑物边界进行多边形拟合;然后用获取拟合结果的最小外接矩形判断建筑物轴向,以选择最佳的外接矩形,并将最佳外接矩形和建筑物轮廓进行逐段等分,计算线段之间的Hausdorff距离,并根据替换规则选择性地用外接矩形边线段进行边界替代,以进一步进行规整优化,最终提高了边缘表达的准确度和提取精度。对多幅遥感影像进行实验,并与其他提取方法进行对比,结果表明:所提方法的总体精度均不同程度地优于参照方法,建筑物边缘的准确性、规整程度及最终精度均得到了有效改善,更真实、准确地反映了建筑物的真实形状。
The contours of buildings extracted using the image classification method are commonly irregular and involve serration issues that are primarily caused by incorrect recognition.Therefore,this paper proposes a building contour optimization method that combines Hausdorff distance and a suitable circumscribed rectangle that conforms to the contour and axial direction of buildings.Firstly,initial results of buildings are extracted using the shifted shadow segmentation and classification principle.For each building,a corresponding fitting polygon is acquired by applying a fitting principle to its building edge.Subsequently,the building axis is assessed using the minimum circumscribed rectangle of the building polygon-fitting result.Based on the axis,a suitable circumscribed rectangle is selected.Furthermore,the building contour and its suitable circumscribed rectangle are respectively divided into equal segments.Meanwhile,the Hausdorff distance between two kinds of segmentations is calculated.If the distance satisfies the substitution rules,building contour segments are replaced with circumscribed rectangular edge segmentation to optimize building regularization.Thus,the proposed method helps in improving the accuracy of building boundary and in promoting building extraction precision.It is tested on several remote sensing images.Compared with other building extraction methods,the results show that the overall accuracy of the proposed method is better than that of the other two reference methods.Moreover,the accuracy and regularization of building contours and the overall precision of building extraction results have been effectively improved.As a result,building shape is more accurately reflected.
作者
王双喜
杨元维
常京新
高贤君
Wang Shuangxi;Yang Yuanwei;Chang Jingxin;Gao Xianjun(School of Geoscience,Yangtze University,Wuhan Hubei 430100 China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan Hubei 430079 China)
出处
《激光与光电子学进展》
CSCD
北大核心
2020年第2期322-331,共10页
Laser & Optoelectronics Progress
基金
武汉大学测绘遥感信息工程国家重点实验室开放基金(18R04)
地理国情监测国家测绘地理信息局重点实验室开放基金(2017NGCM07)
湖北省教育厅科学研究计划(Q20181317)。
关键词
遥感
高分辨率遥感影像
多边形拟合
最佳外接矩形
HAUSDORFF距离
建筑物轮廓规整优化
remote sensing
high-resolution remote sensing image
polygon fitting
suitable circumscribed rectangle
Hausdorff distance
regularization of building contour
