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IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium最新文献

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The Exploitation of the Non Local Paradigm for SAR 3d Reconstruction 非局部范式在SAR三维重建中的应用
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8900595
G. Ferraioli, L. Denis, C. Deledalle, F. Tupin
In the last decades, several approaches for solving the Phase Unwrapping (PhU) problem using multi-channel Interferometric Synthetic Aperture Radar (InSAR) data have been developed. Many of the proposed approaches are based on statistical estimation theory, both classical and Bayesian. In particular, the statistical approaches based on the use of the whole complex multi-channel dataset have turned to be effective. The latter are based on the exploitation of the covariance matrix, which contains the parameters of interest. In this paper, the added value of the Non Local (NL) paradigm within the InSAR multi-channel PhU framework is investigated. The analysis of the impact of NL technique is performed using multi-channel realistic simulated data and X-band data.
在过去的几十年里,已经发展了几种利用多通道干涉合成孔径雷达(InSAR)数据解决相位展开(PhU)问题的方法。许多提出的方法都是基于统计估计理论,包括经典的和贝叶斯的。特别是,基于使用整个复杂多通道数据集的统计方法已经变得有效。后者是基于协方差矩阵的开发,其中包含感兴趣的参数。本文研究了InSAR多通道PhU框架下非局部(NL)范式的附加价值。利用多通道真实模拟数据和x波段数据对NL技术的影响进行了分析。
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引用次数: 0
Hierarchical Deep Feature Representation for High-Resolution Scene Classification 高分辨率场景分类的层次深度特征表示
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8898849
Xiaoyong Bian, Chunfang Chen, Chunhua Deng, Ruiyao Liu, Q. Du
High-resolution scene classification is a fundamental yet challenging problem due to rich image variations in viewpoint, object pose and spatial resolution, etc, which results in large within-class diversity and high between-class similarity. In the paper we focus on tackling the problem of how to learn appropriate feature representation for high-resolution scene classification. To achieve better scene representation, we proposed a combined CNN feature learning framework in multi-scale multi-layer based Gaussian coding (mSmL-Gcoding) manner. In addition, a novel feature coding with Gaussian descriptor is introduced to enhance the discriminative ability of CNN features. Experimental results on two publicly available challenging scene datasets validated that the effectiveness of our method and found it compared favorably with state-of-the-arts.
由于图像在视点、物体姿态和空间分辨率等方面存在丰富的变化,导致类内多样性大,类间相似性高,因此高分辨率场景分类是一个基础而又具有挑战性的问题。本文重点研究了如何学习合适的特征表示来进行高分辨率场景分类的问题。为了实现更好的场景表示,我们提出了一种基于多尺度多层高斯编码(mSmL-Gcoding)方式的组合CNN特征学习框架。此外,引入了一种新的高斯描述子特征编码,增强了CNN特征的判别能力。在两个公开可用的具有挑战性的场景数据集上的实验结果验证了我们的方法的有效性,并发现它与最先进的方法相比更具优势。
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引用次数: 0
Retreval of Solar-Induced Chlorohyll Fluoresence with Principal Component Ananlysis Method 用主成分分析法回收太阳诱导的叶绿素荧光
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8898484
Menghao Ji, B. Tang
The Fraunhofer line discrimination (FLD) principle is widely used for retrieving solar-induced chlorophyll fluorescence (SIF), which assumes that the spectral reflectance is smooth and can be modeled using simply mathematical function. However, the changes in the sun and observation geometry and atmospheric properties result in the ‘hump’ or ‘dip’ of the reflectance spectrum in the oxygen A-band. This leads to overestimations or underestimations in the SIF retrieval. The principal component analysis (PCA) algorithm is one of the main approaches used for satellite-based SIF retrieval, which can acquire reflectance characteristic information due to directional effect with large datasets. This paper attempts to test whether the errors caused by FLD method can be eliminated using the PCA algorithm. The results show that the PCA algorithm performs well in all conditions, with root mean square error less than 0.005, indicating that the bias caused by the changes in sun and observation geometry could be eliminated with PCA algorithm.
弗劳恩霍夫线分辨(FLD)原理被广泛用于太阳诱导叶绿素荧光(SIF)的反演,该原理假设光谱反射率是平滑的,并且可以用简单的数学函数来建模。然而,太阳、观测几何和大气特性的变化导致了氧a波段反射光谱的“驼峰”或“倾角”。这将导致SIF检索中的高估或低估。主成分分析(PCA)算法是星载SIF反演的主要方法之一,在大数据集上,由于方向性的影响,可以获得反射特征信息。本文尝试用PCA算法来检验FLD方法产生的误差是否可以被消除。结果表明,PCA算法在所有条件下都表现良好,均方根误差小于0.005,表明PCA算法可以消除太阳和观测几何形状变化引起的偏差。
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引用次数: 0
A Fast Inference Networks for SAR Target Few-Shot Learning Based on Improved Siamese Networks 基于改进Siamese网络的SAR目标少弹学习快速推理网络
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8898180
Jiaxin Tang, Fan Zhang, Yongsheng Zhou, Q. Yin, Wei Hu
In this paper, we improve the Siamese Networks for SAR target few-shot learning. SAR target recognition is an important branch of SAR application. It can efficiently extract target category information from complex SAR images and help humans quickly understand SAR images. However, many successful machine learning methods require large amounts of annotated data. So, few-shot learning is always a topical challenge for machine learning. We apply Siamese Networks to SAR target recognition with limited data and improved it. Our model consists of CNN encoder, similarity discriminator and classifier. Relevantly, it has two inputs and three outputs. CNN encoder is constrained by similarity discriminator and classifier. Furthermore, the larger difference from the Siamese Network is that the target category is outputted by the classifier, not by the similarity discriminator. Our method not only makes use of the advantage of metric learning to improve the accuracy of SAR target recognition with limited data, but also significantly reduces the prediction time consumption for the model based on metric learning. In the ten categories military vehicle classification task, there are only five samples for each category and a total of 2425 testing samples. Our method outperforms A-ConvNet and Siamese Networks by 15.8% and 8.41%. The prediction time consumption of Siamese Networks is 114.832s, while that of our method is 1.172s.
本文对Siamese网络进行改进,用于SAR目标的少弹学习。SAR目标识别是SAR应用的一个重要分支。它可以有效地从复杂的SAR图像中提取目标类别信息,帮助人类快速理解SAR图像。然而,许多成功的机器学习方法需要大量的注释数据。所以,少次学习一直是机器学习的一个热门挑战。将Siamese网络应用于有限数据条件下的SAR目标识别,并对其进行了改进。该模型由CNN编码器、相似判别器和分类器组成。相应的,它有两个输入和三个输出。CNN编码器受到相似判别器和分类器的约束。此外,与Siamese网络的较大区别在于,目标类别是由分类器输出的,而不是由相似判别器输出的。该方法不仅利用了度量学习的优势,提高了有限数据条件下SAR目标识别的精度,而且显著降低了基于度量学习模型的预测耗时。在十类军车分类任务中,每类只有5个样本,总共2425个测试样本。我们的方法比A-ConvNet和Siamese Networks分别高出15.8%和8.41%。Siamese Networks的预测耗时为114.832s,而我们的方法的预测耗时为1.172s。
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引用次数: 12
The impact of canopy structure assumption on the retrieval of GAI and Leaf Chlorophyll Content for wheat and maize crops 冠层结构假设对小麦和玉米作物GAI和叶片叶绿素含量反演的影响
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8899064
Jingyi Jiang, M. Weiss, Shouyang Liu, F. Baret
Green Area Index (GAI) and Leaf Chlorophyll Content (LCC) are key variables that reflect the potential growth of the canopy. In the past decades, the retrieval of these variables from remote sensing data to generate operational products at high spatial resolution (lower than decametric) was mainly based on 1D radiative transfer model inversion. However, due to the recent advances in computational facility, it is now possible to invert 3D radiative transfer models to improve the operational product accuracy. The use of 3D models allows taking into account more realistic canopy architectures than when using the turbid medium assumption from the 1D radiative transfer models. In this study, we demonstrate the gain in accuracy when inverting crop specific using 3D radiative transfer models as compared to a generic algorithm based on 1D model. We investigate two crops characterized by contrasted architectures along the vegetation cycle, e.g. wheat and maize.
绿面积指数(GAI)和叶片叶绿素含量(LCC)是反映林冠生长潜力的关键变量。在过去的几十年里,从遥感数据中获取这些变量以生成高空间分辨率(低于十米)的业务产品主要是基于一维辐射传输模型反演。然而,由于最近计算设施的进步,现在可以反演三维辐射传输模型以提高操作产品的准确性。与使用1D辐射传输模型中的浑浊介质假设相比,使用3D模型可以考虑到更真实的树冠结构。在本研究中,我们展示了与基于一维模型的通用算法相比,使用3D辐射传输模型反演特定作物时的精度增益。我们研究了两种以植被周期结构对比为特征的作物,如小麦和玉米。
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引用次数: 4
An Auxiliary Parking Method Based on Automotive Millimeter wave SAR 基于汽车毫米波SAR的辅助泊车方法
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8898521
Rufei Wang, Jifang Pei, Yongchao Zhang, Minghui Li, Yulin Huang, Junjie Wu
Finding a suitable parking position often leads to much traffic pressure and time consumption in a busy parking lot. An auxiliary parking method based on automotive millimeter wave SAR is proposed in this paper. Firstly, Maximally Stable Extremal Region (MSER) method is utilized to extract the candidate regions occupied by parked vehicles from the millimeter wave SAR images. Then, in order to eliminate the false alarm candidate regions, we employ the morphological filter and utilize the centroid position to further refine the candidate regions. Thirdly, the difference in width-to-height ratio of the candidate regions is exploited to distinguish the parking directions of the cars. After that, the available parking spaces are located according to the parking direction. Finally, further remove the spaces occupied by obstacles, and plan reasonable parking routes. Experimental results based on measured data show that the proposed method has outstanding detection and parking route planning performance in different scenes.
在繁忙的停车场中,寻找合适的停车位置往往会带来很大的交通压力和时间消耗。提出了一种基于汽车毫米波SAR的辅助泊车方法。首先,利用最大稳定极值区域(MSER)方法从毫米波SAR图像中提取停车车辆占用的候选区域;然后,为了消除虚警候选区域,我们采用形态滤波并利用质心位置进一步细化候选区域。第三,利用候选区域的宽高比差异来区分车辆的停车方向;然后,根据停车方向找到可用的停车位。最后,进一步清除障碍物占用的空间,规划合理的停车路线。基于实测数据的实验结果表明,该方法在不同场景下具有出色的检测性能和停车路径规划性能。
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引用次数: 8
Polarimetric Calibration of Spaceborne SAR Data in The Presence of the Ionosphere by Means of Azimuth Sub-Bands 电离层存在下星载SAR数据的方位角子带偏振定标
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8899101
Jun Su Kim, K. Papathanassiou
A methodology that allows the separation of Faraday Rotation (FR) distortion from system induced distortion for the calibration of spaceborne polarimetric data is proposed and discussed. The separation is based on the azimuth variation of the FR and relies on the assumption that the antenna patterns are sufficiently well characterized.
提出并讨论了一种分离法拉第旋转(FR)畸变和系统诱导畸变的星载极化数据校准方法。分离是基于FR的方位角变化,并依赖于天线方向图被充分表征的假设。
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引用次数: 0
Analysis of Quadratic Phase Error Introduced by Orbit Determination in Spaceborne Trinodal Pendulum Sar Formation Real-Time Imaging with Monte Carlo Simulation 星载三位摆Sar编队实时成像中定轨引入的二次相位误差分析
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8898733
Xiaoyu Yan, Jie Chen, H. Nies, H. Zeng, O. Loffeld
Real-time imaging products using Spaceborne Trinodal Pendulum synthetic aperture radar formation can provide valuable information in certain applications. The onboard orbit determination data of the spaceborne SAR platform is essential for the SAR imaging procedure. For real-time SAR imaging, the onboard orbit determination data is relatively low in accuracy compared with the orbit data obtained by off-line processing for the focusing of SAR data. The influence of errors in onboard real-time orbit determination data on SAR image quality should be considered. This paper proposes a Monte Carlo simulation model for inspecting the influence of onboard orbit determination data on imaging quality. This simulation model and its result may be helpful for the development of SAR real-time imaging focusing on providing terrain change information in a short time.
星载三节摆合成孔径雷达编队实时成像产品可以在某些应用中提供有价值的信息。星载SAR平台的星载定轨数据是SAR成像过程中必不可少的数据。在实时SAR成像中,星载定轨数据的精度相对于离线处理SAR数据聚焦得到的轨道数据要低一些。需要考虑星载实时定轨数据误差对SAR图像质量的影响。提出了一种检测星载定轨数据对成像质量影响的蒙特卡罗仿真模型。该仿真模型及其结果对以短时间内提供地形变化信息为重点的SAR实时成像技术的发展具有一定的指导意义。
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引用次数: 0
Global Self-Labeled Distribution Analysis for Hyperspectral Band Selection 高光谱波段选择的全局自标记分布分析
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8899035
Xin-Yi Tong, Jihao Yin, Limin Wu, Hui Qv
A global self-labeled distribution analysis (GSLDA) for hyperspectral image (HSI) band selection is proposed in this paper, which focuses on an unsupervised method to ascertain the band discrimination. In order to generate the band labels for further analysis, the concept of the local minimum spanning forest (LMSF) is introduced into the construction of the global self-labeled band partitions based on graph theory. Meanwhile, the novel scoring strategy of triple-density indexes is applied to analyze the labeled-band distribution for determining the selected band subset with clear discrimination. The feasibility of the proposed method is evaluated on real hyperspectral data and the experiment results show a competitive good performance, which demonstrates that the selected bands hold apparent global discrimination and robust noise immunity.
提出了一种用于高光谱图像波段选择的全局自标记分布分析(GSLDA)方法,重点研究了一种确定波段区分的无监督方法。基于图论,将局部最小生成森林(LMSF)的概念引入到全局自标记带分区的构造中,以生成可进一步分析的带标签。同时,采用新颖的三密度指标评分策略对标记频带分布进行分析,以确定选择的频带子集具有明确的区分性。在实际高光谱数据上对该方法进行了可行性评估,实验结果表明,所选波段具有明显的全局分辨性和较强的抗噪性。
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引用次数: 1
Hyperspectral Image Classification Via Tensor Ridge Regression 基于张量岭回归的高光谱图像分类
Pub Date : 2019-07-01 DOI: 10.1109/IGARSS.2019.8899896
Jianjun Liu, Hao Chen, Songze Tang, Jinlong Yang, Hong Yan
In this paper, we investigate the ridge regression for multivariate labels by modelling each pixel and its surrounding pixels as a 3D tensor, and thereby propose a tensor ridge regression approach (TRR) for spatial-spectral hyperspectral image classification. Compared with the traditional ridge regression model, not only the spatial information is incorporated, but also the intrinsic spatial-spectral structure is captured. Moreover, the proposed TRR method is universal that it can be adopted to deal with the fusion of multiscale features for classification purpose. Experiment results conducted on two hyperspectral scenes demonstrate the effectiveness of the proposed method.
在本文中,我们通过将每个像素及其周围像素建模为三维张量来研究多元标签的脊回归,从而提出了一种用于空间光谱高光谱图像分类的张量脊回归方法(TRR)。与传统的脊回归模型相比,不仅吸收了空间信息,而且捕获了固有的空间光谱结构。此外,所提出的TRR方法具有通用性,可用于处理多尺度特征融合的分类问题。在两个高光谱场景下的实验结果验证了该方法的有效性。
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引用次数: 0
期刊
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium
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