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基于U-Net的葡萄種植區(qū)遙感識(shí)別方法
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寧夏智慧農(nóng)業(yè)產(chǎn)業(yè)技術(shù)協(xié)同創(chuàng)新中心項(xiàng)目(2017DC53)、國家自然科學(xué)基金項(xiàng)目(41771315)和國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2020YFD1100601)


Remote Sensing Recognition Method of Grape Planting Regions Based on U-Net
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    摘要:

    為提高葡萄種植區(qū)遙感識(shí)別精度,,基于高分二號(hào)衛(wèi)星遙感影像,,對U-Net網(wǎng)絡(luò)進(jìn)行改進(jìn):從空間和通道維度自適應(yīng)校準(zhǔn)特征映射,以增強(qiáng)有意義的特征,,抑制不相關(guān)的特征,,提升地物邊緣分割精度;減少下采樣次數(shù),,使用混合擴(kuò)張卷積代替常規(guī)卷積操作,,以增大卷積核感受野,降低圖像分辨率的損失,,提高對不同尺寸地物的識(shí)別能力,。實(shí)驗(yàn)結(jié)果表明,本文模型在測試集上的像素準(zhǔn)確率,、平均交并比和頻權(quán)交并比分別為96.56%,、93.11%、93.35%,,比FCN-8s網(wǎng)絡(luò)分別提高了5.17,、9.57、9.17個(gè)百分點(diǎn),,比U-Net網(wǎng)絡(luò)提高了2.39,、4.59、4.39個(gè)百分點(diǎn),。此外,,本文通過消融實(shí)驗(yàn)和特征可視化證明了注意力模塊和混合擴(kuò)張卷積在精度提升上的可行性。本文模型結(jié)構(gòu)簡單,、參數(shù)量少,,能夠識(shí)別不同面積的葡萄種植區(qū),邊緣分割效果良好,。

    Abstract:

    The accurate acquisition of the spatial distribution of grape planting regions from remote sensing imagery is of great significance for optimizing the layout of grape planting regions and promoting the structural adjustment of grape industry. Due to the problems of the large differences in the size, unfixed spectral characteristics and complex background environment of the objects, it brings many challenges to accurate crop remote sensing recognition. In order to improve the accuracy of crop remote sensing recognition, a pixel-level accurate recognition method was proposed for grape planting regions based on the GF-2 satellite remote sensing imagery and the U-Net model was taken as the basic skeleton. The main improvements to U-Net were recalibrating the feature maps separately along channel and space adaptively, to boost meaningful features and improve the accuracy of edge segmentation, while suppressing weak ones, and reducing the number of downsampling and using hybrid dilated convolution instead of conventional convolution operation, to cut down the loss of image resolution and improve the recognition of objects of different shapes and sizes. The experiments showed that the pixel accuracy, mean intersection over union (MIoU), and frequency weighted intersection over union (FWIoU) of the model on the test set were 96.56%, 93.11% and 93.35%, respectively, which were 5.17 percentage points, 9.57 percentage points and 9.17 percentage points higher than those of the FCN-8s model, and 2.39 percentage points, 4.59 percentage points and 4.39 percentage points better than those of the original U-Net model. In addition, the impacts of the attention modules and hybrid dilated convolution on this model were analyzed through ablation experiments. The proposed model was simple with few parameters, capable of identifying different sizes of grape planting regions with fine edge segmentation effect, and it can provide an effective way to improve the accuracy of crop remote sensing recognition.

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張宏鳴,張國良,朱珊娜,陳歡,梁會(huì),孫志同.基于U-Net的葡萄種植區(qū)遙感識(shí)別方法[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2022,53(4):173-182. ZHANG Hongming, ZHANG Guoliang, ZHU Shanna, CHEN Huan, LIANG Hui, SUN Zhitong. Remote Sensing Recognition Method of Grape Planting Regions Based on U-Net[J]. Transactions of the Chinese Society for Agricultural Machinery,2022,53(4):173-182.

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  • 收稿日期:2021-04-04
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  • 在線發(fā)布日期: 2021-04-26
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