arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.09050eess.IVcs.CV
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基于多目标CNN的SAR降斑算法

Multi-Objective CNN Based Algorithm for SAR Despeckling

University of Napoli Parthenope(那不勒斯帕泰诺佩大学)

Sergio Vitale, Giampaolo Ferraioli, Vito Pascazio

摘要:

遥感中的深度学习(DL)如今已成为一种有效的操作工具:它主要用于变化检测、图像恢复、分割、检测和分类等应用。在合成孔径雷达(SAR)领域,由于SAR图像的非平凡解释,特别是斑点噪声的存在,使得DL技术的应用并不简单。在过去的几年里,已经提出了几种用于SAR去斑的深度学习解决方案。这些解决方案中的大多数集中在具有类似代价函数的不同网络架构的定义上,而不涉及SAR图像属性。本文提出了一种具有多目标代价函数的卷积神经网络(CNN),该代价函数考虑了SAR图像的空间和统计特性。这是通过定义一个特殊的损失函数来实现的,该损失函数是由三个不同项的加权组合获得的。每个术语主要用于以下SAR图像特征之一:空间细节,斑点统计特性和强散射体识别。它们的组合可以平衡这些影响。此外,一个专门设计的架构,提出了有效地提取所考虑的框架内的独特功能。仿真和真实SAR图像的实验表明,该方法的精度相比,最先进的去斑算法,无论是从定量和定性的角度来看。在代价函数中考虑这样的SAR属性的重要性对于在不同的加下划线的场景(诸如均匀的、异质的和极端异质的)中正确的噪声抑制和细节保留是至关重要的。

英文摘要:

Deep learning (DL) in remote sensing has nowadays become an effective operative tool: it is largely used in applications such as change detection, image restoration, segmentation, detection and classification. With reference to synthetic aperture radar (SAR) domain the application of DL techniques is not straightforward due to non trivial interpretation of SAR images, specially caused by the presence of speckle. Several deep learning solutions for SAR despeckling have been proposed in the last few years. Most of these solutions focus on the definition of different network architectures with similar cost functions not involving SAR image properties. In this paper, a convolutional neural network (CNN) with a multi-objective cost function taking care of spatial and statistical properties of the SAR image is proposed. This is achieved by the definition of a peculiar loss function obtained by the weighted combination of three different terms. Each of this term is dedicated mainly to one of the following SAR image characteristics: spatial details, speckle statistical properties and strong scatterers identification. Their combination allows to balance these effects. Moreover, a specifically designed architecture is proposed for effectively extract distinctive features within the considered framework. Experiments on simulated and real SAR images show the accuracy of the proposed method compared to the State-of-Art despeckling algorithms, both from quantitative and qualitative point of view. The importance of considering such SAR properties in the cost function is crucial for a correct noise rejection and details preservation in different underlined scenarios, such as homogeneous, heterogeneous and extremely heterogeneous.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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