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基于小波紋理和隨機森林的獼猴桃果園遙感提取
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國家高技術(shù)研究發(fā)展計劃(863計劃)項目(2013AA102401-2)、國家重點研發(fā)計劃項目(2017YFC0403203)、國家自然科學基金項目(41771315)和陜西省水利科技項目(2017slkj-7)


Kiwifruit Orchard Mapping Based on Wavelet Textures and Random Forest
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    為快速、準確地從高分影像中獲取獼猴桃種植分布信息,提出了一種結(jié)合小波變換紋理分析和隨機森林分類的QuickBird影像獼猴桃果園自動提取方法。首先,采用coif5小波對QuickBird全色影像進行多尺度小波分解,計算各子頻帶小波系數(shù)的能量特征作為紋理特征;然后,將小波紋理與光譜特征組合構(gòu)建分類特征;最后,利用隨機森林分類實現(xiàn)土地利用分類和獼猴桃果園空間分布提取。結(jié)果表明,小波紋理識別獼猴桃果園的效果明顯優(yōu)于光譜特征和其他2種紋理特征;光譜+小波紋理特征的分類精度最高,獼猴桃果園提取精度(Fk)和總體分類精度(OA)分別為95.30%和94.46%,比光譜+灰度共生矩陣紋理分類分別提高6.70%和2.88%,比光譜+分形紋理分類顯著提高13.43%和6.98%;隨機森林分類結(jié)果優(yōu)于相同特征下的支持向量機、最大似然分類。本文提取的獼猴桃果園面積與目視解譯結(jié)果的相對誤差小于7%。此外,利用本文方法對同期QuickBird影像另一研究區(qū)的蘋果園分布進行提取,結(jié)果表明,該方法對蘋果園提取有較好的適用性。

    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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宋榮杰,寧紀鋒,常慶瑞,班松濤,劉秀英,張宏鳴.基于小波紋理和隨機森林的獼猴桃果園遙感提取[J].農(nóng)業(yè)機械學報,2018,49(4):222-231. SONG Rongjie, NING Jifeng, CHANG Qingrui, BAN Songtao, LIU Xiuying, ZHANG Hongming. Kiwifruit Orchard Mapping Based on Wavelet Textures and Random Forest[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(4):222-231.

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  • 收稿日期:2017-10-16
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  • 在線發(fā)布日期: 2018-04-10
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