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山地丘陵區(qū)遙感影像陰影檢測(cè)與去除方法
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國(guó)家自然科學(xué)基金資助項(xiàng)目(40971043)和福建省科技計(jì)劃重點(diǎn)資助項(xiàng)目(2011N0031)


Shadow Detection and Removal Method for Remote Sensing Image in Mountainous and Hilly Area
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    摘要:

    陰影是山地丘陵區(qū)遙感影像最為普遍的干擾因素,去除陰影有助于提高影像解譯和地物識(shí)別的準(zhǔn)確性和有效性。構(gòu)建了陰影植被指數(shù)(SVI),并提出應(yīng)用波段回歸模型法實(shí)現(xiàn)HJ-1多光譜影像陰影的去除。將該方法應(yīng)用于試驗(yàn)區(qū)HJ-1數(shù)據(jù),結(jié)果表明:SVI可增大山地丘陵區(qū)水體、陰影區(qū)及明亮區(qū)之間的差異,利用閾值法可以實(shí)現(xiàn)影像陰影的有效檢測(cè);相關(guān)分析顯示,各波段擬合模型R2均在080以上;比較陰影去除前、后影像的統(tǒng)計(jì)指標(biāo)說(shuō)明,在植被最為敏感,即受陰影影響最為嚴(yán)重的近紅外波段,隨著陰影的去除,波段平均值有了較大幅度的增大;去陰影后影像的標(biāo)準(zhǔn)差均比原影像要小,尤其是在近紅外波段。試驗(yàn)結(jié)果表明,SVI對(duì)山地丘陵區(qū)HJ-1影像陰影的檢測(cè)效果較好,而波段回歸模型法可以較為有效地實(shí)現(xiàn)陰影的去除。

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    The shadow is the most common interference factor of remote sensing image in mountainous and hilly area, so shadow removal is helpful to the improvement of accuracy and effectiveness for image interpretation and feature recognition. Shaded vegetation index (SVI) was constructed, and the band regression model was built for the shadow removal. The proposed method was applied in HJ-1 multi-spectral image. The results showed that SVI could increase the differences among water, shaded area and bright area. The threshold method could be used to effectively detect the shadow in the image. The correlation analysis showed that R2 of each band regression models was above 0.80. The comparison of image statistical indicators before and after the shadow removal indicated that, the band mean value increased significantly with the removal of shadow at the near-infrared band influenced by shadow and vegetations. The standard deviations of shadow-removal image were lower than those of the original image, especially at the near-infrared band. The testing results showed SVI had good detection effects for the shadow of HJ-1 image in mountainous and hilly area, and the band regression model method could effectively remove the shadow.

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劉健,許章華,余坤勇,龔從宏,唐夢(mèng)雅,謝婉君.山地丘陵區(qū)遙感影像陰影檢測(cè)與去除方法[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2013,44(10):238-241,237. Liu Jian, Xu Zhanghua, Yu Kunyong, Gong Conghong, Tang Mengya, Xie Wanjun. Shadow Detection and Removal Method for Remote Sensing Image in Mountainous and Hilly Area[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(10):238-241,237.

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  • 在線發(fā)布日期: 2013-10-14
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