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融合注意力机制的YOLOv7遥感小目标检测算法研究 被引量:5
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作者 余俊宇 刘孙俊 许桃 《计算机工程与应用》 CSCD 北大核心 2023年第20期167-175,共9页
针对遥感目标检测而言,因其主要是分布密集的小目标从而导致在检测过程中存在漏检误检的情况,其次在检测中还会受目标尺度差异显著和检测背景复杂带来的影响,因此提出一种改进YOLOv7的目标检测方法。通过结合全局语义信息与局部语义信... 针对遥感目标检测而言,因其主要是分布密集的小目标从而导致在检测过程中存在漏检误检的情况,其次在检测中还会受目标尺度差异显著和检测背景复杂带来的影响,因此提出一种改进YOLOv7的目标检测方法。通过结合全局语义信息与局部语义信息的思想,利用集中特征金字塔CFP(centralized feature pyramid)解决遥感图像因目标分布密集以及检测背景复杂导致检测效率较低的问题;针对遥感图像中的小目标分布不定并且其特征表现能力不足从而在检测过程中容易存在漏检、误检的现象,因此,通过引入混合注意力模块ACmix加强网络对于小目标检测的敏感度,以提升对小目标的检测精度;使用WIOU损失函数来优化原网络中的损失函数,提升网络对检测目标的定位能力。在公开的遥感数据中进行实验对比,改进后的网络对于三个检测目标飞机、油罐、操场的mAP分别提升了0.068、0.061、0.098,实验结果表明,在检测背景复杂,检测目标密集分布的情况下,改进的YOLOv7网络性能有所提升。 展开更多
关键词 遥感图像 目标检测 小目标 损失函数 YOLOv7
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Anomaly Detection with Artificial Immune Network
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作者 PENG Lingxi LI Tao +3 位作者 liu Xiaojie CHEN Yuefeng liu Caiming liu sunjun 《Wuhan University Journal of Natural Sciences》 CAS 2007年第5期951-954,共4页
Inspired by the immune network theory, an adaptive anomaly detection paradigm based on artificial immune network, referred as APAI, is proposed. The implementation of the paradigm includes: initially, the first is to... Inspired by the immune network theory, an adaptive anomaly detection paradigm based on artificial immune network, referred as APAI, is proposed. The implementation of the paradigm includes: initially, the first is to create the initial antibody network; then, through the learning of each training antigen, the antibody network is evolved and updated by the optimal antibodies. Finally, anomaly detection process is accomplished by majority vote of the k nearest neighbor antibodies in the network. The experiments used the famous Sonar Benchmark dataset in our study, which is taken from the UCI machine learning database. The obtained detection accuracy of APAI was 97.7%, which was very promising with regard to the other classification applications in the literature for this problem. In addition to its nonlinear classification properties, APAI possesses biological immune network properties such as clonal selection, immune network, and immune memory, which can be applied to pattern recognition, classification, and etc. 展开更多
关键词 anomaly detection artificial immune network machine learning CLASSIFICATION
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