In this paper,a single-shot 360-degree cranial deformity detection system using digital image correlation(DIC)is presented to quickly obtain and detect accurate 3D data of infants’cra-nium.By introducing plane mirror...In this paper,a single-shot 360-degree cranial deformity detection system using digital image correlation(DIC)is presented to quickly obtain and detect accurate 3D data of infants’cra-nium.By introducing plane mirrors into a stereo 3D DIC measurement system,a multi-view 3D imaging model is established to convert 3D data from real and virtual perspectives into 360-degree 3D data of the tested infant cranium,achieving single-shot and panoramic 3D measurement.Exper-imental results showed that the performance and measurement accuracy of the proposed system can meet the requirements for cranial deformity detection,which provides a fast,accurate,and low-cost solution medically.展开更多
Multichannel high-resolution and wide-swath(HRWS)imaging is an advanced digital beamforming technique for future synthetic aperture radar(SAR)systems.However,radio frequency interference(RFI)is a critical concern for ...Multichannel high-resolution and wide-swath(HRWS)imaging is an advanced digital beamforming technique for future synthetic aperture radar(SAR)systems.However,radio frequency interference(RFI)is a critical concern for HRWS SAR missions,which distorts measure-ments and produces image artifacts.In this paper,the spatial cross-correlation coefficients of multichannel HRWS SAR signals are investigated for RFI detection.It is found when the two channels are correlated,RFI-polluted areas present lower coherence values than non-polluted areas in the same scenarios,which makes previous methods fail.Further,this paper studies the case of two fully decorrelated channels to maximize the coherence difference among RFI and target echoes,and RFI detection is realized by exploiting the anomaly value of coherence.Experimental results of real air-borne multichannel SAR data demonstrate that the RFI can be detected successfully.展开更多
针对传统图像处理算法对钢铁表面缺陷检测存在识别效率低、漏检误检率高等问题,提出了YOLOv8-DSG(Deformable Convolution Network Squeeze and Excitation Network Generalized Intersection over Union)钢铁表面缺陷检测算法。在传统Y...针对传统图像处理算法对钢铁表面缺陷检测存在识别效率低、漏检误检率高等问题,提出了YOLOv8-DSG(Deformable Convolution Network Squeeze and Excitation Network Generalized Intersection over Union)钢铁表面缺陷检测算法。在传统YOLOv8算法的基础上,首先在Backbone网络的C2f(Convolution to Feature)模块中嵌入了可变形卷积网络DCN(Deformable Convolution Network),增强了模型在复杂背景条件下的特征提取能力;其次,在Neck网络中引入了SE(Squeeze and Excitation Network)注意力模块,突出钢铁表面重要特征信息,提升了特征融合的丰富性;最后,利用GIOU(Generalized Intersection Over Union)损失函数代替原有的CIOU(Complete Intersection Over Union),相比CIOU,GIOU引入了最小包围框面积比率,可更准确衡量框的重合面积。实验结果表明,YOLOv8-DSG算法在NEU-DET数据集上平均精度mAP达到80%,相较于原YOLOv8算法,提高了3.3%,且误检、漏检率低,具有更高的检测精度和运算效率,可在质量检测方面发挥重要作用。展开更多
基金supported by the National Natural Science Found-ation of China(No.62075096)Leading Technology of Ji-angsu Basic Research Plan(No.BK20192003)+4 种基金National De-fense Science and Technology Foundation of China(No.2019-JCJQ-JJ-381)“333 Engineering”Research Project of Jiangsu Province(No.BRA2016407)Jiangsu Provincial“One Belt and One Road”Innovation Cooperation Project(No.BZ2020007)Fundamental Research Funds for the Central Universities(Nos.30921011208,30919011222 and 30920032101)Open Research Fund of Jiangsu Key Laboratory of Spectral Imaging&Intelligent Sense(No.JS-GP202105).
文摘In this paper,a single-shot 360-degree cranial deformity detection system using digital image correlation(DIC)is presented to quickly obtain and detect accurate 3D data of infants’cra-nium.By introducing plane mirrors into a stereo 3D DIC measurement system,a multi-view 3D imaging model is established to convert 3D data from real and virtual perspectives into 360-degree 3D data of the tested infant cranium,achieving single-shot and panoramic 3D measurement.Exper-imental results showed that the performance and measurement accuracy of the proposed system can meet the requirements for cranial deformity detection,which provides a fast,accurate,and low-cost solution medically.
基金supported by the National Natural Foundation of China(Nos.41001282,40871205,and 62271408)partly by Shanghai Aerospace Science and Technology Innovation Fund(No.SAST2021-044)。
文摘Multichannel high-resolution and wide-swath(HRWS)imaging is an advanced digital beamforming technique for future synthetic aperture radar(SAR)systems.However,radio frequency interference(RFI)is a critical concern for HRWS SAR missions,which distorts measure-ments and produces image artifacts.In this paper,the spatial cross-correlation coefficients of multichannel HRWS SAR signals are investigated for RFI detection.It is found when the two channels are correlated,RFI-polluted areas present lower coherence values than non-polluted areas in the same scenarios,which makes previous methods fail.Further,this paper studies the case of two fully decorrelated channels to maximize the coherence difference among RFI and target echoes,and RFI detection is realized by exploiting the anomaly value of coherence.Experimental results of real air-borne multichannel SAR data demonstrate that the RFI can be detected successfully.
文摘针对传统图像处理算法对钢铁表面缺陷检测存在识别效率低、漏检误检率高等问题,提出了YOLOv8-DSG(Deformable Convolution Network Squeeze and Excitation Network Generalized Intersection over Union)钢铁表面缺陷检测算法。在传统YOLOv8算法的基础上,首先在Backbone网络的C2f(Convolution to Feature)模块中嵌入了可变形卷积网络DCN(Deformable Convolution Network),增强了模型在复杂背景条件下的特征提取能力;其次,在Neck网络中引入了SE(Squeeze and Excitation Network)注意力模块,突出钢铁表面重要特征信息,提升了特征融合的丰富性;最后,利用GIOU(Generalized Intersection Over Union)损失函数代替原有的CIOU(Complete Intersection Over Union),相比CIOU,GIOU引入了最小包围框面积比率,可更准确衡量框的重合面积。实验结果表明,YOLOv8-DSG算法在NEU-DET数据集上平均精度mAP达到80%,相较于原YOLOv8算法,提高了3.3%,且误检、漏检率低,具有更高的检测精度和运算效率,可在质量检测方面发挥重要作用。
