针对红外小目标图像的低分辨率、特征信息少、识别准确率低等问题,提出嵌入空间位置信息和多视角特征提取(Embedded Spatial Location Information and Multi-view Feature Extraction,ESLIMFE)的红外小目标检测模型。首先,随着网络深...针对红外小目标图像的低分辨率、特征信息少、识别准确率低等问题,提出嵌入空间位置信息和多视角特征提取(Embedded Spatial Location Information and Multi-view Feature Extraction,ESLIMFE)的红外小目标检测模型。首先,随着网络深度的增加导致特征图分辨率逐渐减小从而丢失细节信息,因此在骨干网络中嵌入空间位置信息融合注意力机制(Spatial Location Information Fusion,SLIF)弥补小目标特征信息。其次,结合C3模块和动态蛇形卷积提出多视角特征提取(Multi-view Feature Extraction,MVFE)模块,通过在不同视角下提取同一特征来增强小目标的特征表达能力。采用大选择核(Large Selection Kernel,LSK)模块,通过使用不同大小的卷积核提取小目标多尺度信息,以提高对红外小目标定位能力。最后,引入基于注意力的尺度内特征交互(Attention-based Intrascale Feature Interaction,AIFI)模块增强特征之间的交互性。在对空红外小目标数据集上进行实验,实验结果表明,mAP75的检测精度为90.5%,mAP50~95检测精度为74.5%,文中模型能够较好地实现对红外小目标精确检测。展开更多
针对目前智能手机难以拍摄大建筑物全貌以及基于移动视觉检索的户外定位系统匹配大建筑物失准的问题,提出一种面向大建筑物的移动视觉定位算法。基于尺度不变特征变换理论,该算法通过提取建筑物不同角度的特征建立一种建筑物多视角特征...针对目前智能手机难以拍摄大建筑物全貌以及基于移动视觉检索的户外定位系统匹配大建筑物失准的问题,提出一种面向大建筑物的移动视觉定位算法。基于尺度不变特征变换理论,该算法通过提取建筑物不同角度的特征建立一种建筑物多视角特征模型,并基于该模型建立建筑物特征库,同时通过在特征库中匹配用户提交的不同角度建筑物照片的特征点实现定位。实验结果表明,与基于GPS定位的算法相比,该算法能够通过建筑物图像匹配精确的进行定位,解决了GPS在高楼林立的市区定位不准的问题;并且该算法通过保留建筑物特征的空间位置信息,能较好地过滤错误匹配,与基于BOF(bag of feature)算法的移动视觉定位算法相比,提高了匹配精确度,具有较强的实用价值。展开更多
To improve the accuracy and robustness of rolling bearing fault diagnosis under complex conditions, a novel method based on multi-view feature fusion is proposed. Firstly, multi-view features from perspectives of the ...To improve the accuracy and robustness of rolling bearing fault diagnosis under complex conditions, a novel method based on multi-view feature fusion is proposed. Firstly, multi-view features from perspectives of the time domain, frequency domain and time-frequency domain are extracted through the Fourier transform, Hilbert transform and empirical mode decomposition (EMD).Then, the random forest model (RF) is applied to select features which are highly correlated with the bearing operating state. Subsequently, the selected features are fused via the autoencoder (AE) to further reduce the redundancy. Finally, the effectiveness of the fused features is evaluated by the support vector machine (SVM). The experimental results indicate that the proposed method based on the multi-view feature fusion can effectively reflect the difference in the state of the rolling bearing, and improve the accuracy of fault diagnosis.展开更多
文摘针对目前智能手机难以拍摄大建筑物全貌以及基于移动视觉检索的户外定位系统匹配大建筑物失准的问题,提出一种面向大建筑物的移动视觉定位算法。基于尺度不变特征变换理论,该算法通过提取建筑物不同角度的特征建立一种建筑物多视角特征模型,并基于该模型建立建筑物特征库,同时通过在特征库中匹配用户提交的不同角度建筑物照片的特征点实现定位。实验结果表明,与基于GPS定位的算法相比,该算法能够通过建筑物图像匹配精确的进行定位,解决了GPS在高楼林立的市区定位不准的问题;并且该算法通过保留建筑物特征的空间位置信息,能较好地过滤错误匹配,与基于BOF(bag of feature)算法的移动视觉定位算法相比,提高了匹配精确度,具有较强的实用价值。
基金The National Natural Science Foundation of China(No.51875100)
文摘To improve the accuracy and robustness of rolling bearing fault diagnosis under complex conditions, a novel method based on multi-view feature fusion is proposed. Firstly, multi-view features from perspectives of the time domain, frequency domain and time-frequency domain are extracted through the Fourier transform, Hilbert transform and empirical mode decomposition (EMD).Then, the random forest model (RF) is applied to select features which are highly correlated with the bearing operating state. Subsequently, the selected features are fused via the autoencoder (AE) to further reduce the redundancy. Finally, the effectiveness of the fused features is evaluated by the support vector machine (SVM). The experimental results indicate that the proposed method based on the multi-view feature fusion can effectively reflect the difference in the state of the rolling bearing, and improve the accuracy of fault diagnosis.
