检索结果-内蒙古大学图书馆

IET International Radar Conference 2015

作者： Xu, J.C. Ren, L.X. Jiang, Z.Y. Mao, E.K. Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing China School of Information and Electronics Beijing Institute of Technology Beijing China

ISBN: (纸本)9781785610387

This paper presents a novel low complexity TOA estimation method for unknown signal under low SNR condition, especially for inner-pulse modulated signal. In this new method, received signal is firstly pre-processed by multiplying its delayed conjugation to reduce intra-pulse modulation. Then a refined coherent accumulation is applied to achieve a precise TOA estimation result. Simulation results show that this new method can achieve an accurate TOA estimation for unknown signal under low SNR condition.

关键词： Coherent accumulation Multiplication with delayed conjugation TOA estimation

来源：评论

学校读者我要写书评

暂无评论

Mutual information Optimization Based Dynamic Log-Polar Image Registration

引用

Journal of Shanghai Jiaotong university(Science) 2015年第1期20卷 61-67页

作者：张葵张晓龙徐新付晓薇 Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System College of Computer Science and Technology Wuhan University of Science and Technology

Log-polar transformation(LPT)is widely used in image registration due to its scale and rotation invariant *** LPT,rotation and scale transformation can be made into translation displacement in log-polar coordinates,and phase correlation technique can be used to get the *** LPT based image registration,constant samples in digitalization processing produce less precise and effective ***,dynamic log-polar transformation(DLPT)is used in this *** is a method that generates several sample sets in axes to produce several results and only the effective results are used to get the final results by using statistical ***,DLPT can get more precise and effective transformation results than the conventional *** information(MI)is a similarity measure to align two images and has been used in image registration for a long *** optimal transform for image registration can be obtained by maximizing MI between the two *** registration based on MI is robust in noisy,occlusion and illumination changing *** this paper,we study image registration using MI and *** with digitalizing images and with real image datasets are performed,and the experimental results show that the combination of MI with DLPT is an effective and precise method for image registration.

关键词： image registration mutual information(MI) log-polar transformation(LPT) phase correlation technique

来源：评论

学校读者我要写书评

暂无评论

A clutter suppression method of ground penetrating radar for detecting shallow surface target

A clutter suppression method of ground penetrating radar for...

引用

IET International Radar Conference 2015

作者： Wang, Xun Liu, Hai-Bo Meng, Zheng School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology China

ISBN: (纸本)9781849199940

GPR for detecting shallow surface target has heavy clutter and target echo cannot be distinguished easily. This paper proposes a PCA-SVD mixed clutter suppression method to realize dimension reduction and reconstruction, which can improve the performance of clutter suppression effectively. SVD processing remove direct wave, firstly. Then PCA remove uncancelled clutter and remove noise. At last, we design an experiment to validate the performance of clutter suppression.

关键词： Ground penetrating radar systems

来源：评论

学校读者我要写书评

暂无评论

A vascular bifurcations detection method based on Transfer Learning model

A vascular bifurcations detection method based on Transfer L...

引用

International Congress on Image and Signal processing, BioMedical Engineering and Informatics (CISP-BMEI)

作者： Xiaoming Liu Jia Wang Zhou Yang Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System China College of Computer Science and Technology Wuhan University of Science and technology Wuhan China

ISBN: (纸本)9781509037117

Many distinguished methods for vascular network detection in fundus images were proposed to help the diagnosis of clinical diseases. The vascular bifurcation sample in OCT projection images is quite limited while it is sufficient in the corresponding fundus images. In this paper, we proposed a transfer learning-based method to detect the vascular bifurcations in OCT projection images using supervised transfer learning method. The samples from fundus images are utilized with transfer learning technique for vascular bifurcations detection in OCT projection images. The experimental results show the accuracy of vascular bifurcations detection can be improved by the proposed method.

关键词： Bifurcation Gabor filters Training Support vector machines Retina Learning systems Optical filters

来源：评论

学校读者我要写书评

暂无评论

The method of multi-channel phased array radar squint SAR system design

The method of multi-channel phased array radar squint SAR sy...

引用

IET International Radar Conference 2015

作者： Cui, Lei Gao, Jing Wang, Zixiao Yao, Di Department of Electronic Engineering Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology China

ISBN: (纸本)9781849199940

Multi-channel phased array radar has the following advantages: detection multiple target, far work distance, antiinterference capability, and sensitive response, etc. The squint SAR (Synthetic Aperture Radar) is an effective means of detection in complex background in all-weather and all-day. Multi-channel phased array radar needs the consistency of amplitude and phase. The design of the system parameter should focus on the problem of spatial variability properties of PRF and resolution design. This paper introduces the composition analysis of multi-channel phased array radar, consistency of amplitude and phase, and the design of radar system parameters. The result of flight experimentation verifies the method of system design.

关键词： Systems analysis

来源：评论

学校读者我要写书评

暂无评论

Design of a large point FFT processor with configurable transform length

Design of a large point FFT processor with configurable tran...

引用

IET International Radar Conference 2015

作者： Xie, Yu Feng, Yang-Kai Yang, Chen Xie, Yi-Zhuang Chen, He Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology Shanghai Institute of Satellite Engineering Beijing China

ISBN: (纸本)9781849199940

In this paper, a scheme of a large point FFT processor with configurable transform length is proposed. To achieve a pipelined structure, the proposed scheme is designed by Radix-2 decimation-in-frequency (DIF) FFT algorithm with Single-path Delay Feedback (SDF) architecture. A prototype is implemented on Xilinx Virtex-7 XC7VX690T FPGA, which can compute 16∼128K FFT at a speed as high as *** scheme is superior to existing technologies, due to its ability to process a continuous-flow input sequence and its prospect for real-time, configurable transform length applications.

关键词： Field programmable gate arrays (FPGA)

来源：评论

学校读者我要写书评

暂无评论

Improved SPECAN algorithm based on Doppler rate equalization

Improved SPECAN algorithm based on Doppler rate equalization

引用

IET International Radar Conference 2015

作者： Li, Y. Ding, Z. Long, T. Key Laboratory of Embedded Real-Time Information Processing Technology Radar Research Lab. School of Information and Electronics Beijing Institute of Technology Beijing China

ISBN: (纸本)9781785610387

The spectral analysis (SPECAN) algorithm is efficient and always used for synthetic aperture radar (SAR) data processing. But the azimuth dependence of Doppler rate is neglected in SPECAN algorithm, which results in the defocusing of targets away from the scene center. In order to solve this problem, an improved SPECAN algorithm is proposed. Considering the fact that the region of support in the azimuth frequency domain is different for targets in the same range gate, the algorithm equalizes the Doppler rate by nonlinear chirp scaling (NCS) in the azimuth frequency domain. Moreover, a modified map drift (MD) autofocus method is given to estimate the Doppler rate and its dependence. Finally, the effectiveness of the proposed algorithm is verified by real SAR data.

关键词： Spectrum analysis

来源：评论

学校读者我要写书评

暂无评论

A real-time processing system for airborne forward-squint SAR based on DSP

A real-time processing system for airborne forward-squint SA...

引用

IET International Radar Conference 2015

作者： Zhang, Ningyu Yao, Di Li, Congxin Jing, Kai School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology China Key Laboratory of Electronic and Information Technology in Satellite Navigation China

ISBN: (纸本)9781849199940

Aiming at the characteristics of the airborne forwardsquint SAR imaging, a high-performance SAR real-time processing system is established in this paper. Firstly, in order to realize range cell migration correction (RCMC) accurately and range-azimuth decoupling in forwardsquint SAR imaging, a high-precision SAR imaging algorithm is used in this system, namely nolinear chirp scaling(NCS) algorithm. Secondly, the motion of airborne platform is unstable, so the weighted phase gradient autofocus (WPGA) algorithm is used for motion compensation. Finally, a real-time signal processor is designed which is based on the TMS320C6678 multi-core DSPs issued by TI. The processor satisfied the demands of SAR real-time imaging because of its powerful processing performance and high-speed data transmission ability.

关键词： Synthetic aperture radar

来源：评论

学校读者我要写书评

暂无评论

A novel noise reduction method for optical coherence tomography images

A novel noise reduction method for optical coherence tomogra...

引用

International Congress on Image and Signal processing, BioMedical Engineering and Informatics (CISP-BMEI)

作者： Xiaoming Liu Zhou Yang Jia Wang Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan China College of Computer Science and Technology Wuhan University of Science and technology Wuhan China

ISBN: (纸本)9781509037117

In the field of image processing, compared with noisy image, high-quality or clean image usually has a positive impact on the final results, which lead to the emergence of image denoising. Recently, the patch-based methods have attracted considerable interest of researchers, which leverage the self-similarity of the noisy image or information of other relevant images. In this paper, we proposed a novel patch-based method to reduce the noise in optical coherence tomography (OCT) image, which consist of two steps. A combination of internal denoising and external denoising is adopted to select similar patches for each patch in the noisy image. Next, we use low rank technique to denoise the group of the noisy patch and its similar patches. After all patches in a noisy image are denoised, the corresponding clean image is constructed by aggregating all denoised pixels and the first step denoising is accomplished. A new noisy image is constructed and taken as the input of the second step denoising. Experimental results demonstrate that our method achieves better effect and performance, compared with the existing state-of-the-art methods.

关键词： Noise measurement Noise reduction Standards Optical coherence tomography Sparse matrices Databases Image processing

来源：评论

学校读者我要写书评

暂无评论

A new twin support vector machine for pattern recognition

A new twin support vector machine for pattern recognition

引用

International Congress on Image and Signal processing, BioMedical Engineering and Informatics (CISP-BMEI)

作者： Xiaoming Liu Ting Zhu Leilei Zhai Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan China College of Computer Science and Technology Wuhan University of Science and technology Wuhan China

ISBN: (纸本)9781509037117

A new nonparallel twin support vector machine is presented in this article which combine l 2,1 -norm minimizing on both loss function and regularization which called (TWSVM_21). Our TWSVM_21 is formulated aiming to separate class more efficiently. Different from other nonparallel classifier, such as the presented TBSVM, the classifier we proposed in this paper joint l 2,1 -norm. Experiments on DDSM datasets show the feasibility and effectiveness of our TWSVM_21.

关键词： Support vector machines Feature extraction Cancer Standards Geometry Delta-sigma modulation Robustness

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：