基于小波纹理和随机森林的猕猴桃果园遥感提取
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国家高技术研究发展计划(863计划)项目(2013AA102401-2)、国家重点研发计划项目(2017YFC0403203)、国家自然科学基金项目(41771315)和陕西省水利科技项目(2017slkj-7)


Kiwifruit Orchard Mapping Based on Wavelet Textures and Random Forest
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    摘要:

    为快速、准确地从高分影像中获取猕猴桃种植分布信息,提出了一种结合小波变换纹理分析和随机森林分类的QuickBird影像猕猴桃果园自动提取方法。首先,采用coif5小波对QuickBird全色影像进行多尺度小波分解,计算各子频带小波系数的能量特征作为纹理特征;然后,将小波纹理与光谱特征组合构建分类特征;最后,利用随机森林分类实现土地利用分类和猕猴桃果园空间分布提取。结果表明,小波纹理识别猕猴桃果园的效果明显优于光谱特征和其他2种纹理特征;光谱+小波纹理特征的分类精度最高,猕猴桃果园提取精度(Fk)和总体分类精度(OA)分别为95.30%和94.46%,比光谱+灰度共生矩阵纹理分类分别提高6.70%和2.88%,比光谱+分形纹理分类显著提高13.43%和6.98%;随机森林分类结果优于相同特征下的支持向量机、最大似然分类。本文提取的猕猴桃果园面积与目视解译结果的相对误差小于7%。此外,利用本文方法对同期QuickBird影像另一研究区的苹果园分布进行提取,结果表明,该方法对苹果园提取有较好的适用性。

    Abstract:

    In order to obtain the distribution information of the kiwifruit orchards in high spatial resolution remote imagery fast and accurately, a hybrid method for automatic detection of kiwifruit orchard based on wavelet transform and random forest classification algorithm was proposed. Firstly, a wavelet transform based texture extracting process was carried out on the QuickBird panchromatic band by means of a two level decomposition with coif5 biorthogonal wavelet function, and the multi-scale wavelet textures were further derived from the energy characteristics of the wavelet coefficients in each sub-band. Secondly, the wavelet textures and spectral features were combined to construct the classification feature vectors. Finally, the kiwifruit orchard distributions were automatically delineated through land cover classification by using the random forest ensemble technique. The wavelet textures were found to be more effective in identifying kiwifruit orchard compared with the multi spectral features, gray level co-occurrence matrix (GLCM) textural features and fractal textural features. There was an obvious increase in kiwifruit orchard extracting accuracy (Fk) and overall classification accuracy (OA) when spectral features were combined with textural features compared with spectral-only and texture-only features. The highest classification accuracies were achieved by the integration of spectral features and the multi-scale wavelet texture features (spectral + wavelet TF) with Fk of 95.30% and OA of 94.46%, which was 6.70% and 2.88% higher respectively than those of the results of spectral+ GLCM features and 13.43% and 6.98% higher respectively than those of spectral + fractal features. Among the three classifiers used, the random forest classifier demonstrated the best performance in terms of OA and Fk, followed by support vector machine classifier and the maximum likelihood classifier under the same features. The extracted area of kiwifruit orchard was also assessed by the visual interpretation results and the relative error was less than 7%. An apple orchard extracting experiment in another test region was carried out by using the same method, and the results indicated that the method had good applicability.

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宋荣杰,宁纪锋,常庆瑞,班松涛,刘秀英,张宏鸣.基于小波纹理和随机森林的猕猴桃果园遥感提取[J].农业机械学报,2018,49(4):222-231.

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  • 收稿日期:2017-10-16
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  • 在线发布日期: 2018-04-10
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