基于无人机测绘图像边缘分割算法的城市土地资源利用分类

Urban land use classification based on UAV mapping image edge segmentation algorithm

  • 摘要: 城市土地资源利用类型分析过程中,往往通过卫星遥感图像边缘分割获取分类结果,其包含的地理空间数据分辨率较低,导致最终分类结果的Kappa系数较低. 因此,提出基于无人机(unmanned aerial vehicle,UAV)测绘图像边缘分割算法的城市土地资源利用分类方法. 利用UAV设备采集城市土地资源区域的测绘图像,以此完成小波域阈值去噪、自适应中值滤波和自适应Wiener滤波,去除图像中的高斯与脉冲混合噪声. 将UAV测绘图像均分为多个小块,分别完成灰度非线性变换处理,实现原始图像的增强. 针对预处理后的UAV测绘图像,运用窗口灰度加权算法提取图像边缘特征,再通过低秩重构网络完成测绘图像边缘分割处理. 设计以支持向量机(support vector machine, SVM)为核心的分类识别算法,对每个土地资源分割区域进行判断,得到最终的城市土地资源利用分类结果. 实验结果表明:该方法给出分类结果的Kappa系数超过了0.85,极大提升了土地资源利用分类的准确程度.

     

    Abstract: In the process of analyzing urban land resource utilization types, classification results are often obtained through edge segmentation of satellite remote sensing images, which contain low resolution geospatial data, resulting in lower Kappa coefficients in the final classification results. Therefore, a classification method for urban land resource utilization based on unmanned aerial vehicle (UAV) mapping image edge segmentation algorithm is proposed. Using UAV equipment to collect surveying and mapping images of urban land resource areas, wavelet domain threshold denoising, adaptive median filtering, and adaptive Wiener filtering are completed to remove Gaussian and pulse mixed noise in the images. Divide the UAV mapping image into multiple small blocks and perform grayscale nonlinear transformation processing to enhance the original image. For the preprocessed UAV surveying images, the window grayscale weighting algorithm is used to extract image edge features, and then a low rank reconstruction network is used to complete the surveying image edge segmentation processing. Design a classification and recognition algorithm with support vector machine (SVM) as the core, judge each land resource segmentation area, and obtain the final urban land resource utilization classification result. The experimental results show that the Kappa coefficient of the classification results obtained by this method exceeds 0.85, greatly improving the accuracy of land resource utilization classification.

     

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