检索结果-内蒙古大学图书馆

International Conference on Mechatronics and Automation

作者： Wang, Yuanyu Li, Yuanzong Zhang, Tianxu Department of Computer Fundamental Education TaiYuan University of Technology TaiYuan CO 030024 China College of Mechanical Engineering TaiYuan University of Technology TaiYuan CO 030024 China Institute for Pattern Recognition and A.I. State Key Laboratory of Image Processing and Intelligent Control HuaZhong University of Science and Technology WuHan CO 430074 China

ISBN: (纸本)9781424451418

In order to solve the problem of image degradation caused by dust environments, an image degradation model considering multiple scattering factors caused by dust was first established using the first-order multiple scattering method. Then, a dark channel prior principle was applied to present an image restoration algorithm based on the image degradation model. Finally, a particle swarm optimization algorithm was applied to optimize the atmospheric light and the exposure parameters. This optimization algorithm was established according to the criterion of the image evaluation based on kirsch operator with dual threshold. By using the method an optimistic result of image restoration was obtained. The experimental results have shown that the method not only enhanced luminance and contrast, but also discovered more detail edges information. The method provided a foundation for target recognition in the dust environments. © 2010 IEEE.

关键词： Dust

来源：评论

学校读者我要写书评

暂无评论

Beam hardening correction for fan-beam CT imaging with multiple materials

Beam hardening correction for fan-beam CT imaging with multi...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Yanbo Zhang Xuanqin Mou Shaojie Tang Institute of Image Processing & Pattern Recognition Xi''an Jiaotong University Xi'an Shaanxi China Department of Radiology Emory University School of Medicine Atlanta GA USA

In X-ray CT, Beam hardening (BH) effect, which is caused by polychromatic X-ray beam and energy-dependent attenuation coefficients, always introduces cupping and streak artifacts. Most of correction methods can only deal with beam hardening artifacts for a single material or dual-material object, but fail to correct in case of a multi-material object since the correction complexity and instability increase with the increase of the kinds of materials. In this paper, we proposed a multimaterial BH correction method. A binary Legendre polynomial is adopted to correct BH based on bi-parameter imaging physical model, and the Helgasson-Ludwig consistency condition (H-L consistency condition) is introduced to optimally determine the bi-parameters of all materials. In the simulation experiments showed that the proposed method can suppress the artifacts greatly. The corrected values approach very closely to the ideal ones.

关键词： Materials Computed tomography Polynomials X-ray imaging Biomedical imaging image reconstruction Training

来源：评论

学校读者我要写书评

暂无评论

Effect of fiducial configuration on target registration eerror in image-guided surgery-A experiment study

Effect of fiducial configuration on target registration eerr...

引用

International Conference on BioMedical Engineering and Informatics (BMEI)

作者： Wenbin Zhang Guofang Shen Chenhao Wang Yuncai Liu Department of Oral and Maxillofacial Surgery Ninth People''s Hospital Shanghai China Institute of Image Processing and Pattern Recognition Shanghai Jiaotong University Shanghai China

This paper investigates the effect of fiducials configuration on target registration error (TRE) and test the accuracy of theoretical model of TRE prediction in image-guided cranio-maxillofacial surgery. The skull specimen is prepared with 20 titanium microscrews placed at defined locations and scanned with a 64-slice spiral computed tomography unit. These markers are separated to registration fiducial group and target fiducial group. An optical tracking system is used to perform skull-to-image registration procedures. Subsequent to each registration, the TRE is calculated by the navigation system. Each configuration have been performed registration 50 times and the average is regarded as TRE of the configuration. The TRE prediction is also calculated for each configuration. The TRE ranges from 0.58mm to 3.88mm, relatively smaller values of TRE may be achieved by placing a majority of fiducials on the maxillary alveolus in proximity about the target and placing a small number on the cranium contralaterally. The TRE values are always larger than the corresponding TRE prediction but there is high correlation between them. The configuration of fiducials is an important factor in minimizing TRE and the TRE prediction is a good guidance for fiducial markers placement.

关键词： Navigation Accuracy Extraterrestrial measurements Neurosurgery Three dimensional displays Orbits

来源：评论

学校读者我要写书评

暂无评论

CT reconstruction based on improved total variation minimization

CT reconstruction based on improved total variation minimiza...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Qiong Xu Xuanqin Mou Shaojie Tang Yanbo Zhang Institute of Image Processing & Pattern Recognition Xi''an Jiaotong University Xi'an Shaanxi China Department of Radiology Emory University School of Medicine Atlanta GA USA

Reconstruction algorithm based on total variation (TV) minimization has become a hot topic in CT field. In order to make a better balance between suppressing noise and preserving edge, an improved variation is proposed in this paper. An anisotropic strategy is developed to effectively preserve the edges of imaging objects. Simultaneously, the unity weight in the original variation is substituted by an amplitude dependent weight to suppress the smaller variations, which arise from noise effect with a higher possibility. Numerical simulations validated that the CT reconstruction based on the improved variation has a better reconstruction performance as compared to its original counterpart.

关键词： TV image reconstruction Minimization image edge detection Computed tomography Noise

来源：评论

学校读者我要写书评

暂无评论

MULTIMODALITY GENDER ESTIMATION USING BAYESIAN HIERARCHICAL MODEL

MULTIMODALITY GENDER ESTIMATION USING BAYESIAN HIERARCHICAL ...

引用

IEEE International Conference on Acoustics, Speech, and Signal processing

作者： Xiong Li Xu Zhao Huanxi Liu Yun Fu Yuncai Liu Institute of Image Processing & Pattern Recognition Shanghai Jiao Tong University 200240 Shanghai China Department of CSE University at Buffalo (SUNY) NY 14260 USA

ISBN: (纸本)9781424442959

We propose to estimate human gender from corresponding fingerprint and face information with the Bayesian hierarchical model. Different from previous works on fingerprint based gender estimation with specially designed features, our method extends to use general local image features. Furthermore, a novel word representation called latent word is designed to work with the Bayesian hierarchical model. The feature representation is embedded to our multimodality model, within which the information from fingerprint and face is fused at the decision level for gender estimation. Experiments on our internal database show the promising performance.

关键词： Gender estimation fingerprint and face Bayesian hierarchical model latent word representation multimodality

来源：评论

学校读者我要写书评

暂无评论

Three-dimensional ultrasonic data smooth and endocardial extraction

Three-dimensional ultrasonic data smooth and endocardial ext...

引用

International Conference on BioMedical Engineering and Informatics (BMEI)

作者： Xionghu Luo Huilin Xiong Guozhen Chen Institute of Image Processing and Pattern Recognition Shanghai Jiaotong University Shanghai China Department of Heart Center Shanghai Children's Medical Center Shanghai China

This paper presents a new approach for visualizing the surfaces from 3D ultrasound data. 3D ultrasound data usually contain substantial quantity of speckle noise, which makes the extraction of smooth and continuous surfaces extremely difficult. In this paper, combining the partial differential equation model of anisotropic diffusion filter with the Lee filter, we present a new algorithm for handling 3D ultrasound data, aiming to suppress the speckle noise, and meanwhile, smooth the ultrasound image. Additionally, the marching cubes algorithm is applied to extract a smooth endocardial surface. Comparing experiments are presented to illustrate the effectiveness of our approach.

关键词： Noise Mathematical model Anisotropic magnetoresistance Three dimensional displays Speckle Rendering (computer graphics) Filtering algorithms

来源：评论

学校读者我要写书评

暂无评论

Research and Implementation of A multi-Fault Diagnosis Method Based on Case-based Reasoning

Research and Implementation of A multi-Fault Diagnosis Metho...

引用

The 8th World Congress on Intelligent Control and Automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Gan Zhihua Lu Yang Chai Xiuli Institute of Complex Intelligent Network System Henan University Kaifeng Henan Province China Institute of Image Processing and Pattern Recognition Henan University Kaifeng Henan Province Chin

In this paper, a multiple fault diagnosis method based on case-based reasoning (CBR) is presented. And the characteristics of multiple fault modes are studied, then the case knowledge library is established for multiple faults, finally a twostep case retrieval strategy is proposed. The candidate case generation method based on the membership weights is employed to initially retrieve, which can reduce the number of candidate cases efficiently. Then, through calculating the case similarity using the grey relational analysis, the most probable fault case is obtained. It can avoids the problem of time-consuming computation resulting from the combination explosion of multiple faults. Finally, an example is applied to illustrate the proposed scheme, the results mean that the above method is effective, and it can be adopted in the actual industrial production.

关键词： Fault diagnosis Libraries Cognition Correlation Rotors Artificial intelligence Testing

来源：评论

学校读者我要写书评

暂无评论

An interactive method for computing tooth-root orientation from 3D CT image

An interactive method for computing tooth-root orientation f...

引用

International Conference on Medical image Analysis and Clinical Applications (MIACA)

作者： Jie Xie Yang Liu Jilin Yin Tiantian Qiu Yuanliang Huang Lisheng Wang Institute of Image Processing and Pattern Recognition Department of Automation Shanghai Jiaotong University Shanghai China Department of Dentistry Shanghai East Hospital University of Tongji Shanghai China

ISBN: (纸本)9781424480111

In tooth implantation surgery, dentist or surgeon needs to derive quantitative information about the place each implant should be go, the length and width of each implant should be, as well as the angle each implant should be inserted, based on the 3D CT image of jaw of a patient. In existing techniques, the information is measured from such slices that are generated from virtually cutting teeth-ridge along the direction perpendicular to teeth-ridge. However, according to the clinical experience and anatomical knowledge, usually the largest length of each implant should be measured on such slice that is generated by cutting teeth-ridge along the tooth root direction. Besides, for each defect tooth, the most suitable angle or orientation to insert an implant is the tooth root orientation. Thus, in surgical planning of dental implant, it is much important to compute or estimate tooth root orientation from 3D CT image of jaw. To our knowledge, this problem is seldom studied in existing literature. In this paper, we try to discuss this problem.

关键词： Computed tomography Teeth Implants Dentistry Surgery Length measurement Bones Surges image restoration Biomedical imaging

来源：评论

学校读者我要写书评

暂无评论

A watermark technology of print-scan resilient based on DFT transform

引用

Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology 2010年第SUPPL. 1期36卷 113-117页

作者： Zou, Jian-Cheng Si, Jian-Min Institute of Image Processing and Pattern Recognition North China University of Technology Beijing 100144 China

A method of printing and certificate forgery based on digital watermarking is presented. This method embeds watermark in the DFT domain using the principles that middle and low frequency coefficients have little changes in print-scan process, and using HOUGH transform for image correction to resist rotation attacks when extracting watermarks. The experimental results show that this method has strong robustness to first print-scan images, which can be detected right watermarks, while for the second print-scan images robustness drops about 20%. Therefore the algorithm can be used to identify the authenticity of printing and certificates by the correction of the watermarks and can be used to all types of copyright protection and certificates security.

关键词： Copyrights

来源：评论

学校读者我要写书评

暂无评论

A new replica selection strategy based on combination algorithm

A new replica selection strategy based on combination algori...

引用

International Conference on Internet Technology and Applications, ITAP 2010

作者： Guo, Zheng-Wei Li, Ning Li, Hui Shi, Nan College of Computer and Information Engineering Institute of Image Processing and Pattern Recognition Henan University Kaifeng Henan China College of Computer and Information Engineering Henan University Kaifeng Henan China

ISBN: (纸本)9781424451432

In the data grid environment, when users access to files, how to select the best site to obtain files from multiple replicas and reach the highest QOS(quality of service) in the cost of same price is a problem that need to be studied urgently, that is replica selection. In this paper, it proposes a new combination algorithm based on genetic algorithm and ant algorithm, which not only solves the inefficient disadvantage of genetic algorithm, but also solves the problem of solving problems slowly in the early period in ant algorithm. This strategy is analyzed and simulated by data grid simulator OptorSim, and the results show that this new algorithm can be effective in reducing data access latency, improve data access speed, speed up job completion time, and achieve load balancing. ©2010 IEEE.

关键词： Genetic algorithms

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：