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    基于HSV和纹理特征的裸地分层精细提取

    Hierarchical fine-scale information extraction of bare land based on hue-saturation-value and texture features

    • 摘要: 裸地提取对于国土规划、环境保护和可持续发展具有关键作用。已有的裸地提取方法在大范围、多时相的应用中难以兼顾提取效率和提取精度,针对该问题,提出一种基于色调-饱和度-明度(hue-saturation-value,HSV)特征分析构建归一化差值指数,结合纹理特征和植被指数,分层精细、简单高效地实现裸地提取的方法,并应用于山东省曲阜市城区。首先,以3期高分一号(GF-1)卫星影像为数据源,将影像的红、绿、蓝波段转换到HSV色彩空间,基于裸地与其他地物类型在H,S,V分量上的差异,构建归一化差值SH指数和归一化差值SV指数,实现裸地分层初步提取; 然后,对H,S,V分量差异不明显的低层建筑区与裸地引入纹理特征,对比分析不同纹理特征,实现裸地进一步提取; 最后,利用归一化植被指数实现裸地的最终提取,并进行结果后处理。结果表明,构建的归一化差值指数结合同质性纹理特征的提取效果最好,裸地提取的总体精度在93%以上,Kappa系数在0.84以上,均高于对比的分类方法,说明所提方法对裸地提取的有效性,为裸地提取提供新的思路和方法。

       

      Abstract: Extracting information about bare land is crucial for territorial planning, environmental protection, and sustainable development. However, current information extraction methods for bare land struggle to balance the extraction efficiency and accuracy in large-scale and multitemporal applications. This study constructed normalized difference indices based on the analysis of the hue-saturation-value (HSV) features. By combining texture features and vegetation index, this study proposed a simple, efficient hierarchical fine-scale information extraction method for bare land. This proposed method was applied to the urban area of Qufu City, Shandong Province, China. First, with three GF-1 satellite images as the data source, the red, green, and blue bands from the images were converted to the HSV color space. Based on the differences in H, S, and V components between bare land and other land types, the normalized difference SH and SV indices were constructed for preliminary hierarchical information extraction of bare land. Second, texture features were introduced to low-rise building areas and bare land, where the differences in H, S, and V components are nonsignificant. Different texture features were comparatively analyzed for further information extraction of bare land. Third, the normalized difference vegetation indices were used to achieve the final information extraction of bare land, followed by post-processing of the results. The results of this study demonstrate that the constructed normalized difference indices, combined with homogeneous texture features, showed the optimal extraction performance, with an overall accuracy of above 93% and a Kappa coefficient of above 0.84, outperforming other classification methods. Therefore, the proposed method proves effective in extracting information about bare land, serving as a novel approach for bare land information extraction.

       

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