检索结果-内蒙古大学图书馆

Improving Integrality of Detected Moving Objects Based on Image Matting

Chinese Journal of Electronics 2025年第4期23卷 742-746页

作者： Liang Zhang Haili Wang Tao Deng Xiaomei He Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin China Training Center of Engineering Technology Civil Aviation University of China Tianjin China

The integrality of moving objects is the basis for video-based object tracking and action analysis. But it often becomes unreliable as a result of shadow elimination when the object has similar properties with real shadow. The proposed methods manage to improve the integrality of detected moving objects as much as possible, by image matting operated on candidate shadow regions. Existing approaches for image matting require manual labeling of foreground and background. Considering the moving feature points in shadow may cause classification errors, we propose automatic scribbling methods based on Scale invariant feature transform (SIFT) and Speeded-up robust feature (SURF) respectively. Experiments demonstrate that our methods eliminate real shadow effectively and improve object segmentation in the case of object parts and shadows presenting similar characteristics.

关键词： Object segmentation Transforms Manuals Object tracking labeling

来源：评论

学校读者我要写书评

暂无评论

Weighted Iterative Complex Demodulation for High-Resolution Instantaneous Frequencies in Low-Frequency PPG signals from Wearable Devices

引用

IEEE Journal of Biomedical and Health Informatics 2025年

作者： Lee, Seungseok Lee, Soyoung Jang, Woocheol Kim, Jina Yon, Dong Keon Lee, Jinseok Kyung Hee University Department of Biomedical Engineering Yongin Korea Republic of Biological Signal Processing Advanced Lab Samsung Electronics Yongin Korea Republic of Kyung Hee University College of Medicine Center for Digital Health Medical Science Research Institute Seoul Korea Republic of

In this study, we present the development and validation of an advanced signal processing algorithm, weighted iterative time-frequency complex demodulation (wi-TFCD), designed to enhance noise suppression and improve time-frequency resolution in low-frequency physiological signals. We evaluate wi-TFCD against traditional methods such as short-time Fourier transform (STFT), variable frequency complex demodulation (VFCDM), and the baseline iterative TFCD (i-TFCD), using both synthetic chirp signals contaminated with additive Gaussian white noise and real-world photoplethysmography (PPG) signals recorded during exercise. The results demonstrate that wi-TFCD consistently outperforms the other methods, achieving the lowest Renyi entropy and the highest Stankovi ´ c concentration, which ´ correspond to improved spectral compactness and clarity. For a sinusoidal chirp signal, wi-TFCD achieves a Renyi entropy that ´ is 1.29 times lower than VFCDM and 1.27 times lower than iTFCD, a Stankovic concentration 3.62 times higher than VFCDM ´ and 3.01 times higher than i-TFCD, and a mean square error (MSE) that is 1.29 times lower than VFCDM and 1.11 times lower than i-TFCD, demonstrating superior resolution and robustness under noise. In PPG-based heart rate (HR) estimation across 55 subjects, wi-TFCD achieves a mean absolute error (MAE) of 4.99 bpm, compared to 5.19 bpm for i-TFCD and 5.42 bpm for VFCDM. These findings confirm that wi-TFCD provides more precise signal representation and robust physiological monitoring, making it a promising tool for wearable health applications where motion artifacts and noise are prevalent. © 2013 IEEE.

关键词： White noise

来源：评论

学校读者我要写书评

暂无评论

Intelligent checking model of Chinese radiotelephony read-backs in civil aviation air traffic control

引用

Chinese Journal of Aeronautics 2018年第12期31卷 2280-2289页

作者： Guimin JIA Fangyuan CHENG Jinfeng YANG Dan LI Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

Federal Aviation Administration(FAA) and NASA technical reports indicate that the misunderstanding in radiotelephony communications is a primary causal factor associated with operation errors, and a sizable proportion of operation errors lead to read-back errors. We introduce deep learning method to solve this problem and propose a new semantic checking model based on Long Short-Time Memory network(LSTM) for intelligent read-back error checking. A meanpooling layer is added to the traditional LSTM, so as to utilize the information obtained by all the hidden activation vectors, and also to improve the robustness of the semantic vector extracted by LSTM. A MultiLayer Perceptron(MLP) layer, which can maintain the information of different regions in the concatenated vectors obtained by the mean-pooling layer, is applied instead of traditional similarity function in the new model to express the semantic similarity of the read-back pairs quantitatively. The K-Nearest Neighbor(KNN) classifier is used to verify whether the read-back pairs are consistent in semantics according to the output of MLP layer. Extensive experiments are conducted and the results show that the proposed model is more effective and more robust than the traditional checking model to verify the semantic consistency of read-backs automatically.

关键词： Air traffic control Chinese radiotelephony read-backs LSTM Mean pooling MLP Semantic checking

来源：评论

学校读者我要写书评

暂无评论

Interference suppression for global positioning system using self-coherent MUSIC

International Journal of Digital Content Technology and its ...

引用

International Journal of Digital Content Technology and its Applications 2011年第9期5卷 411-417页

作者： Lu, Dan Wu, Ren-biao National Key Lab for Radar Signal Processing Xidian University Xi'an 710071 China Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China

In this paper, a two stage GPS anti-jamming processor based on subspace and self-coherent property of the C/A code is proposed. Firstly, the array received signals are projected onto the interference orthogonal subspace to suppress interferences. Then direction of arrival (DOA) of GPS signal is obtained by self-coherent MUSIC and the free interference signals are synthesized by self-coherent estimated DOA. The new anti-jamming method could play the respective advantages of each stage. Simulation experiment results show the effectiveness of the new algorithm.

关键词： Global positioning system

来源：评论

学校读者我要写书评

暂无评论

Log-cumulants of the finite mixture model and their application to statistical analysis of fully polarimetric UAVSAR data

引用

Geo-Spatial Information Science 2018年第1期21卷 45-55页

作者： Xinping Deng Jinsong Chen Hongzhong Li Pengpeng Han Wen Yang Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhenChina Signal Processing Lab School of Electronic InformationWuhan UniversityWuhanChina

Since its first flight in 2007,the UAVSAR instrument of NASA has acquired a large number of fully Polarimetric SAR(PolSAR)data in very high spatial *** is possible to observe small spatial features in this type of data,offering the opportunity to explore structures in the *** general,the structured scenes would present multimodal or spiky *** finite mixture model has great advantages in modeling data with irregular *** this paper,a type of important statistics called log-cumulants,which could be used to design parameter estimator or goodness-of-fit tests,are derived for the finite mixture *** are compared with logcumulants of the texture *** results are adopted to UAVSAR data analysis to determine which model is better for different land types.

关键词： Finite mixture model UAVSAR log-cumulant statistical analysis Polarimetric SAR(PolSAR)

来源：评论

学校读者我要写书评

暂无评论

Shadow verification based on feature matching and image matting

引用

Information Technology Journal 2013年第3期12卷 518-521页

作者： Zhang, Liang He, Xiaomei Haili Wang Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China 300000 Tianjin China

Moving object detection is the basis for reliable high level processing such as object tracking and action recognition. Shadow verification processes are very important to ensure integrality of extracted moving objects. Moving features appear in detected shadow regions indicate classification errors. The proposed method identifies false detected shadows by detecting moving features and corrects those classification errors by means of image matting operated on candidate shadow regions. Existing approaches for image matting require manual labeling of foreground and background. We propose an automatic scribbling method followed by a closed-form matting process to solve the coefficient alpha. Then, the alpha image is binarized directly to avoid time-consuming computation for reconstructing foreground. Experiments demonstrate that our method can improve the moving object segmentation effectively even in the case of object parts and shadows presenting similar characteristics. © 2013 Asian Network for Scientific Information.

关键词： Object recognition

来源：评论

学校读者我要写书评

暂无评论

Image Restoration and Enhancement for Finger-Vein Recognition

Image Restoration and Enhancement for Finger-Vein Recognitio...

引用

2012 IEEE 11th International Conference on signal processing(ICSP 2012)

作者： Yihua Shi Jinfeng Yang Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

ISBN: (纸本)9781467321969

Finger-vein recognition has been a hot topic in biometrics community. However, finger-vein images are always poor in quality. This is very unhelpful for finger-vein feature analysis in practice. Considering the light propagation behavior in biological tissue and the variations of veins in orientation and diameter, in this paper, we propose an effective finger-vein image enhancement method based on scattering removal and a bank of even Gabor filters. The experimental results show that the proposed method has a good performance in venous region enhancement and can improve the finger-vein recognition accuracy significantly.

关键词： image Gabor Image Restoration and Enhancement for Finger-Vein Recognition

来源：评论

学校读者我要写书评

暂无评论

Optimal Strategy of DME Beacon Distrbution for DME/DME Area Navigation

Optimal Strategy of DME Beacon Distrbution for DME/DME Area ...

引用

2012 IEEE 11th International Conference on signal processing(ICSP 2012)

作者： Shuyu Li Yude Ni Na Cai Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

ISBN: (纸本)9781467321969

Distance measuring equipment (DME) is important ground based navigation system for implementation of area navigation (RNAV), and its positioning accuracy is directly related to geometric dilution of precision (GDOP). For the distribution of three DME beacons, this paper establishes the GDOP algorithm model based on DME/DME RNAV, the GDOP calculation is deduced, and the relation between GDOP and DME ground station distribution is given. The affection of the geometric configuration and the baseline length of DME stations, and of the aircraft height on GDOP values are studied and simulated by MATlab. The optimal methods of DME beacon distribution for DME/DME RNAV are proposed in this paper, and all these results will provide theoretical guidance for implementation of DME/DME RNAV in China.

关键词： geometric dilution of precision (GDOP) Strategy of DME beacon distribution area navigation (RNAV) performance based navigation (PBN)

来源：评论

学校读者我要写书评

暂无评论

A Method of Multispectral Finger-Vein Image Fusion

A Method of Multispectral Finger-Vein Image Fusion

引用

2012 IEEE 11th International Conference on signal processing(ICSP 2012)

作者： Jinfeng Yang Yongshuang Jia Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

ISBN: (纸本)9781467321969

The optical characteristics of the biological tissue varies with the spectral of near infrared light, so the multi-spectral finger-vein images will present some different tissue information compared with the single-spectral finger-vein images. Therefore, the fusion of multispectral finger-vein image will be more beneficial for finger-vein recognition. In this paper, we propose a pixel-level based fusion method which utilizes an improved regional energy fusion strategy for implementing multispectral finger-vein fusion. The proposed fusion method takes the regional energy in a 3*3 sliding window as fusion intensity, and for dealing with the redundant information in some bands, the optimal band combination is adopted in fusion process. Moreover, the proposed strategy only cost a few milliseconds in computing, which can meet the real-time requirement. Finally, experimental results show that the proposed method achieves an excellent fusion of finger-vein multispectral information and provides more accuracy in finger-vein recognition.

关键词： multispectral finger-vein image improved re-gional energy optimal band combination real-time requirement

来源：评论

学校读者我要写书评

暂无评论

Robust Widenull Anti-jamming Algorithm for High Dynamic GPS

Robust Widenull Anti-jamming Algorithm for High Dynamic GPS

引用

2012 IEEE 11th International Conference on signal processing(ICSP 2012)

作者： Lu Dan Wu Renbiao Wang Wenyi Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

ISBN: (纸本)9781467321969

In this paper, a robust null broadening algorithm is proposed for high dynamic global positioning system (GPS) interference suppression. The new algorithm reconstructs interference subspace by additional discrete sources of interferences, which could broaden the width of nulls and adapt to the rapid change of the interference directions in the high dynamic environment. Also the proposed algorithm would form the robust beam pattern utilizing the diagonal loading technique, which improves the performance of the conventional null broadening beamformer in snapshot deficient. The simulation results show that the feasibility of the proposed algorithm.

关键词： global positioning system high dynamic interference suppression null broadening

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：