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测绘学报  2013 

改进GAC模型在点云和影像自动提取建筑物边界中的应用

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Keywords: GAC模型,交替序贯滤波,Lidar点云,航空影像,建筑物边界提取

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Abstract:

本文以自动生成测地线活动轮廓(GeodesicActiveContour,简称GAC)模型的初始曲线及改进其外力为出发点,提出了一种基于Lidar点云和随机影像数据,利用改进的GAC模型进行建筑物边界提取的方案。该方案首先利用形态学交替序贯滤波自动获得模型演化的初始曲线,进而利用Lidar深度梯度影像改进模型演化的外力,得到了改进的测地线活动轮廓(ImprovedGeodesicActiveContour,简称IGAC)模型。仿真实验表明,采用IGAC模型,抑制了弱边界泄漏的问题,提高了建筑物边界提取的完整性和形状精确度。

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