The accurate identification of marine oil spills and their emulsions is of great significance for emergency response to oil spill pollution.The selection of characteristic bands with strong separability helps to reali...The accurate identification of marine oil spills and their emulsions is of great significance for emergency response to oil spill pollution.The selection of characteristic bands with strong separability helps to realize the rapid calculation of data on aircraft or in orbit,which will improve the timeliness of oil spill emergency monitoring.At the same time,the combination of spectral and spatial features can improve the accuracy of oil spill monitoring.Two ground-based experiments were designed to collect measured airborne hyperspectral data of crude oil and its emulsions,for which the multiscale superpixel level group clustering framework(MSGCF)was used to select spectral feature bands with strong separability.In addition,the double-branch dual-attention(DBDA)model was applied to identify crude oil and its emulsions.Compared with the recognition results based on original hyperspectral images,using the feature bands determined by MSGCF improved the recognition accuracy,and greatly shortened the running time.Moreover,the characteristic bands for quantifying the volume concentration of water-in-oil emulsions were determined,and a quantitative inversion model was constructed and applied to the AVIRIS image of the deepwater horizon oil spill event in 2010.This study verified the effectiveness of feature bands in identifying oil spill pollution types and quantifying concentration,laying foundation for rapid identification and quantification of marine oil spills and their emulsions on aircraft or in orbit.展开更多
针对传统基于遥感影像数据提取网箱信息中存在的精度低、“异物同谱”、“椒盐”噪声等问题。基于高分二号卫星(Gaofen-2 satellite,GF-2)数据,提出了一种改进的双支网络模型网箱信息提取方法。该模型在空间编码路径上利用密集连接块提...针对传统基于遥感影像数据提取网箱信息中存在的精度低、“异物同谱”、“椒盐”噪声等问题。基于高分二号卫星(Gaofen-2 satellite,GF-2)数据,提出了一种改进的双支网络模型网箱信息提取方法。该模型在空间编码路径上利用密集连接块提取网箱的空间特征信息,在全局编码路径上利用全局平均池化快速获得网箱的全局上下文信息,最终通过特征融合来丰富网箱空间细节特征信息和深层判别特征信息,提高了网箱的提取精度。本文方法在精确率、交并比(intersection over union,IOU)和F1分数这3个评价指标上分别取得了87.37%,72.56%和82.47%的得分,与精度最高的传统方法相比分别提高了7.82,4.12和4.64百分点,与经典的深度学习模型相比较在IOU和F1上也取得了8.43和8.69百分点的提高。实验表明,这一方法能很好地满足海水网箱养殖区的提取工作,此方法可以为近海海水网箱养殖业的监管和调控提供技术支持。展开更多
密集场景下准确人群计数和定位,对于保障公共安全具有重要的意义。针对密集人群计数与定位易受人群分布不均、背景干扰等因素的影响,导致计数定位不准确的问题,提出一种基于区域感知校准的自适应人群计数与定位方法。通过构建金字塔结...密集场景下准确人群计数和定位,对于保障公共安全具有重要的意义。针对密集人群计数与定位易受人群分布不均、背景干扰等因素的影响,导致计数定位不准确的问题,提出一种基于区域感知校准的自适应人群计数与定位方法。通过构建金字塔结构提取人群图像的多尺度特征,增强特征关联性,并设计可变形几何自适应模块学习不同分布的人群几何特征,以增强对人群分布不均的适应性。在此基础上,提出区域感知和区域校准模块,提取全局上下文特征和区域特征,克服了背景干扰造成的定位与计数不准问题。接着通过双分支卷积预测通路,输出生成点的预测位置和置信度分数,以提高网络的定位与计数精度。最后提出改进二分图最大匹配Hopcroft-Karp算法对真值点与预测点进行匹配校准,从而完成人群定位与计数。实验结果表明,所提方法分别在公开的ShanghaiTech Part A和Part B数据集、NWPU-Crowd数据集、UCF-QNRF数据集上评价指标均优于对比算法,且定位精度较P2Pnet分别提高了3.5%、6.1%、11.3%和8.1%,能够有效提高人群定位与计数的准确度。展开更多
基金Supported by the National Natural Science Foundation of China(Nos.42206177,U1906217)the Shandong Provincial Natural Science Foundation(No.ZR2022QD075)the Fundamental Research Funds for the Central Universities(No.21CX06057A)。
文摘The accurate identification of marine oil spills and their emulsions is of great significance for emergency response to oil spill pollution.The selection of characteristic bands with strong separability helps to realize the rapid calculation of data on aircraft or in orbit,which will improve the timeliness of oil spill emergency monitoring.At the same time,the combination of spectral and spatial features can improve the accuracy of oil spill monitoring.Two ground-based experiments were designed to collect measured airborne hyperspectral data of crude oil and its emulsions,for which the multiscale superpixel level group clustering framework(MSGCF)was used to select spectral feature bands with strong separability.In addition,the double-branch dual-attention(DBDA)model was applied to identify crude oil and its emulsions.Compared with the recognition results based on original hyperspectral images,using the feature bands determined by MSGCF improved the recognition accuracy,and greatly shortened the running time.Moreover,the characteristic bands for quantifying the volume concentration of water-in-oil emulsions were determined,and a quantitative inversion model was constructed and applied to the AVIRIS image of the deepwater horizon oil spill event in 2010.This study verified the effectiveness of feature bands in identifying oil spill pollution types and quantifying concentration,laying foundation for rapid identification and quantification of marine oil spills and their emulsions on aircraft or in orbit.
文摘针对传统基于遥感影像数据提取网箱信息中存在的精度低、“异物同谱”、“椒盐”噪声等问题。基于高分二号卫星(Gaofen-2 satellite,GF-2)数据,提出了一种改进的双支网络模型网箱信息提取方法。该模型在空间编码路径上利用密集连接块提取网箱的空间特征信息,在全局编码路径上利用全局平均池化快速获得网箱的全局上下文信息,最终通过特征融合来丰富网箱空间细节特征信息和深层判别特征信息,提高了网箱的提取精度。本文方法在精确率、交并比(intersection over union,IOU)和F1分数这3个评价指标上分别取得了87.37%,72.56%和82.47%的得分,与精度最高的传统方法相比分别提高了7.82,4.12和4.64百分点,与经典的深度学习模型相比较在IOU和F1上也取得了8.43和8.69百分点的提高。实验表明,这一方法能很好地满足海水网箱养殖区的提取工作,此方法可以为近海海水网箱养殖业的监管和调控提供技术支持。
文摘密集场景下准确人群计数和定位,对于保障公共安全具有重要的意义。针对密集人群计数与定位易受人群分布不均、背景干扰等因素的影响,导致计数定位不准确的问题,提出一种基于区域感知校准的自适应人群计数与定位方法。通过构建金字塔结构提取人群图像的多尺度特征,增强特征关联性,并设计可变形几何自适应模块学习不同分布的人群几何特征,以增强对人群分布不均的适应性。在此基础上,提出区域感知和区域校准模块,提取全局上下文特征和区域特征,克服了背景干扰造成的定位与计数不准问题。接着通过双分支卷积预测通路,输出生成点的预测位置和置信度分数,以提高网络的定位与计数精度。最后提出改进二分图最大匹配Hopcroft-Karp算法对真值点与预测点进行匹配校准,从而完成人群定位与计数。实验结果表明,所提方法分别在公开的ShanghaiTech Part A和Part B数据集、NWPU-Crowd数据集、UCF-QNRF数据集上评价指标均优于对比算法,且定位精度较P2Pnet分别提高了3.5%、6.1%、11.3%和8.1%,能够有效提高人群定位与计数的准确度。
