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基于二维压缩感知的定向遥感和变化检测 被引量:4
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作者 程涛 朱国宾 刘玉安 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2013年第5期456-461,共6页
基于高斯测量矩阵的一维压缩感知测量数据不仅能很好地保持稀疏信号的能量信息,也能够很好地继承稀疏信号的方向信息.但是在一维压缩感知模型中方向信息无法应用于稀疏信号的重构和检验.针对遥感影像中变化区域稀疏的特点提出了二维压... 基于高斯测量矩阵的一维压缩感知测量数据不仅能很好地保持稀疏信号的能量信息,也能够很好地继承稀疏信号的方向信息.但是在一维压缩感知模型中方向信息无法应用于稀疏信号的重构和检验.针对遥感影像中变化区域稀疏的特点提出了二维压缩感知模型.并利用能量和方向信息构建了基于二维压缩感知的稀疏信号重构算法(2DOMP).理论分析和实验结果证明,2DOMP算法的信号重构能力更强.同时根据压缩感知恢复稀疏信号只需要很少测量数据的特性提出了定向遥感和定向变化检测的概念. 展开更多
关键词 定向遥感 变化检测 二维压缩感知(2DCS) 结构先验信息 相关性 多时相 二维正交匹配追踪(2DOMP)
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Oriented Bounding Box Object Detection Model Based on Improved YOLOv8
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作者 ZHAO Xin-kang SI Zhan-jun 《印刷与数字媒体技术研究》 CAS 北大核心 2024年第4期67-75,114,共10页
In the study of oriented bounding boxes(OBB)object detection in high-resolution remote sensing images,the problem of missed and wrong detection of small targets occurs because the targets are too small and have differ... In the study of oriented bounding boxes(OBB)object detection in high-resolution remote sensing images,the problem of missed and wrong detection of small targets occurs because the targets are too small and have different orientations.Existing OBB object detection for remote sensing images,although making good progress,mainly focuses on directional modeling,while less consideration is given to the size of the object as well as the problem of missed detection.In this study,a method based on improved YOLOv8 was proposed for detecting oriented objects in remote sensing images,which can improve the detection precision of oriented objects in remote sensing images.Firstly,the ResCBAMG module was innovatively designed,which could better extract channel and spatial correlation information.Secondly,the innovative top-down feature fusion layer network structure was proposed in conjunction with the Efficient Channel Attention(ECA)attention module,which helped to capture inter-local cross-channel interaction information appropriately.Finally,we introduced an innovative ResCBAMG module between the different C2f modules and detection heads of the bottom-up feature fusion layer.This innovative structure helped the model to better focus on the target area.The precision and robustness of oriented target detection were also improved.Experimental results on the DOTA-v1.5 dataset showed that the detection Precision,mAP@0.5,and mAP@0.5:0.95 metrics of the improved model are better compared to the original model.This improvement is effective in detecting small targets and complex scenes. 展开更多
关键词 Remote sensing image Oriented bounding boxes object detection Small target detection YOLOv8
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基于分块对角矩阵的二维压缩感知数据采集和重构方法 被引量:1
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作者 程涛 《探测与控制学报》 CSCD 北大核心 2017年第3期60-65,共6页
针对遥感中线阵推扫数据采集模式和现有方法重构能力的不足,提出基于分块对角矩阵和TV(Total Variation)算法的二维压缩感知模型和方法。该方法能够使压缩感知的约束函数和目标函数同时包含完整的图像二维信息,是真正完全意义上的二维... 针对遥感中线阵推扫数据采集模式和现有方法重构能力的不足,提出基于分块对角矩阵和TV(Total Variation)算法的二维压缩感知模型和方法。该方法能够使压缩感知的约束函数和目标函数同时包含完整的图像二维信息,是真正完全意义上的二维压缩感知。在不改变传统数据采集模式的基础上,通过分块对角矩阵的后处理,实现二维压缩感知。实验结果表明,该方法使图像的重构效果获得极大改善,SNR提高约8dB。但是该方法不适用于OMP(Orthogonal Matching Pursuit)和BP(Basis Pursuit)算法。该方法促进了定向遥感的发展,如与其他模型和方法结合,能进一步提高重构效果。 展开更多
关键词 二维压缩感知 定向遥感 线阵推扫 分块对角矩阵 全变分
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