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基于紋理特征和SVM的QuickBird影像蘋果園提取
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國家高技術(shù)研究發(fā)展計劃(863計劃)項目(2013AA102401-2),、國家自然科學(xué)基金項目(31501228)和陜西省自然科學(xué)基金項目(2015JM3110)


Apple Orchard Extraction with QuickBird Imagery Based on Texture Features and Support Vector Machine
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    為提高高空間分辨率遙感影像(高分影像)中蘋果園提取精度,基于QuickBird遙感數(shù)據(jù),,研究綜合光譜特征和紋理特征的蘋果園自動提取方法,。該方法首先采用最佳指數(shù)因子(OIF)獲取多光譜波段最佳組合,,然后采用不同大小滑動窗口(從3像素×3像素到13像素×13像素)提取全色波段的灰度共生矩陣(GLCM)、分形和空間自相關(guān)3種紋理特征并分別與光譜特征組合,,最后通過支持向量機(jī)(SVM)分類進(jìn)行蘋果園分類識別,。研究表明:在分類特征上,與單一光譜或紋理特征相比,,光譜特征結(jié)合紋理特征能有效提高蘋果園提取精度(Fa)和總體分類精度(OA),,其中光譜+GLCM紋理(9像素×9像素)分類精度最高,F(xiàn)a和OA分別為96.99%和96.16%,,比光譜+分形紋理分別提高0.63個百分點(diǎn)和1.56個百分點(diǎn),,比光譜+空間自相關(guān)紋理顯著提高11.92個百分點(diǎn)和9.20個百分點(diǎn)。在分類方法上,,通過對比分析SVM,、最大似然和神經(jīng)網(wǎng)絡(luò)3種方法的分類結(jié)果,探明SVM分類識別蘋果園精度最高,。最后對蘋果園提取結(jié)果進(jìn)行面積統(tǒng)計,結(jié)果表明GLCM紋理結(jié)合SVM分類的蘋果園面積估算與目視解譯結(jié)果的一致性超過98%,。

    Abstract:

    In order to improve the accuracy of apple orchard extracting in very high spatial resolution (VHSR) remote sensing image, an automated apple orchard extracting method based on texture features together with spectral values and support vector machine (SVM) was studied. This method firstly obtained the optimum combination of multi-spectral bands by using the optimum index factor (OIF);then three kinds of texture features, namely gray level co-occurrence matrix (GLCM), fractal and spatial autocorrelation texture with six different window sizes (from 3 pixels×3 pixels to 13 pixels×13 pixels) were extracted from the panchromatic image for comparison, and further merged with spectral values respectively;finally the above features were used to identify apple orchard by using SVM. Experiments using QuickBird data showed that spectral features combined with texture features could achieve higher apple orchard extraction accuracy (Fa) and overall accuracy (OA) than using spectral features or textures features alone. Among the different features used, the spectral+GLCM features (with 9 pixels×9 pixels) achieved the highest accuracy (Fa and OA were 96.99% and 96.16%, respectively), which were slightly higher (0.63 and 1.56 percentages, respectively) than those of spectral+fractal features and significantly higher (11.92 and 9.20 percentages, respectively) than those of spectral+spatial autocorrelation features. Among the different classification methods, three classification techniques (SVM, maximum likelihood and neural networks) were compared for accuracy in apple orchard detection, and results suggested that SVM had the highest accuracy in identifying apple orchard. McNemar test was also computed for statistic significance among spectral+GLCM and other features and also among the three classifiers, and the confidence levels were all less than 5%. Consistency of the extracted apple orchard area and the visual interpretation results according to filed investigation and Google Earth VHSR concurrent image were able to achieve 98% in test regions.

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宋榮杰,寧紀(jì)鋒,劉秀英,常慶瑞.基于紋理特征和SVM的QuickBird影像蘋果園提取[J].農(nóng)業(yè)機(jī)械學(xué)報,2017,48(3):188-197. SONG Rongjie, NING Jifeng, LIU Xiuying, CHANG Qingrui. Apple Orchard Extraction with QuickBird Imagery Based on Texture Features and Support Vector Machine[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(3):188-197.

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  • 收稿日期:2016-06-18
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  • 在線發(fā)布日期: 2017-03-10
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