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A high performance fully pipelined architecture for lossless compression of satellite image

A high performance fully pipelined architecture for lossless...

引用

2010 International Conference on Multimedia Technology, ICMT 2010

作者： Wang, Ze Zhang, Tianxu Yan, Luxin Gong, Cheng State Key Laboratory for Multispectral Information Processing Technologies Institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424478743

This paper presents a novel hardware implementation of the adaptive JPEG-LS in field programmable gate array (FPGA), based on the low complexity lossless compression for images (LOCO-I) compression scheme. Differently from what previously reported in literature, this design achieves a much lower complexity and super high data throughput through an improved prediction model by breaking the feedback loop of context parameters updating. The processing speed of this design is up to 75Mpixels per second, while the compression ratio is slightly lower than the standard JPEG-LS compression. Performance evaluation also indicates that design complexity and compression efficiency can be taken account at the same time to achieve satisfactory result. Such an implementation could be used for high-speed compression of satellite remote sensing image onboard. ©2010 IEEE.

关键词： image compression

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Reduced reference image quality assessment based on Weibull statistics

Reduced reference image quality assessment based on Weibull ...

引用

International Workshop on Quality of Multimedia Experience, QoMEx

作者： Wufeng Xue Xuanqin Mou Institute of Image Processing and Pattern Recognition Xi''an Jiaotong University China

ISBN: (纸本)9781424469598;9781424469604

Theories in fragmentation have proved that the statistics of image gradient magnitude followed a Weibull distribution, with β (scale) and γ (shape) as free parameters, which are demonstrated to be strongly correlated with brain response. In this paper, we chose β extracted from the proposed strongest component map (SCM) in scale space, as the reduced reference (RR) feature, and developed a novel method for reduced reference image quality assessment (RRIQA) named βW-SCM. For each scale, the SCM was constructed by assembling coefficients with maximum amplitude among different orientations into a single map. The Weibull parameters were then estimated from the SCM. The final image quality was computed by summing the geometric mean of the defined absolute and relative deviations of β. Performance evaluation on the well-known LIVE database demonstrated an outstanding advantage of low RR feature data rate with nearly the same prediction accuracy and consistency.

关键词： image quality Statistics Statistical distributions Weibull distribution Shape Assembly Parameter estimation image databases Spatial databases Accuracy

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Spatial direction estimation for multiple sound sources in reverberation environment

Spatial direction estimation for multiple sound sources in r...

引用

2010 IEEE International Conference on Robotics and Biomimetics, ROBIO 2010

作者： Li, Huakang Zhao, Qunfei Saji, Akira Tanno, Keita Huang, Jie School of Computer Science and Engineering University of Aizu Aizu-Wakamatsu 965-8580 Japan Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9781424493173

In this paper, we propose spatial localization of multiple sound sources using a spherical robot head equipped with four microphones. We obtain arrival time differences using phase difference candidates. Based on the model of precedence effect, arrival temporal disparities obtained from the zero-crossing point are used to calculate time differences and suppress the influence of echoes in a reverberant environment. To integrate spatial cues of different microphone pairs, we use a mapping method from the correlation between different microphone pairs to a 3D map corresponding to azimuth and elevation of sound sources directions. Experiments indicate that the system provides the distribution of sound sources in azimuth-elevation localization, with the EA model even concurrently in reverberant environments. © 2010 IEEE.

关键词： Reverberation

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Modifying Road Shape in Digital Map Based on Convexity and Concavity

Modifying Road Shape in Digital Map Based on Convexity and C...

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2010 2nd International Conference on Computer Engineering and Technology(2010年第二届计算机工程与技术国际会议 ICCET 2010)

作者： Yun Ye Yuncai Liu Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University

ISBN: (纸本)9781424463473

With the unprecedented growing of city economy and the crying need for public transportation,the ease of traffic related problems such as traffic jams has been a hard nut to crack everywhere. In this paper,a new method based on convexity and concavity to better position the roads and streets of urban areas in order for further GPS/GIS integrated system,which is used for traffic flow analysis,traffic forecast,traffic induction and car positioning and tracking etc,is proposed. Compared with our previous work,this method can yield better results,and the accuracy that we get can be comparable to Google map. Our experiments are based on the data of the city of Shanghai and the results are very satisfying.

关键词： its:turning point:convexity:concavity digital map

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A method of ground-based space object opho-electronic imaging simulation

A method of ground-based space object opho-electronic imagin...

引用

International Conference on Multimedia Technology

作者： Zhang, Putao Zhang, Tianxu State Key Laboratory for Multi-spectral Information Processing Technologies Institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424478743

It is very necessary to observe, tracking and recognise interested space object including space debris around the earth. A simulation method about ground-based sensor observing, tracking and imaging space object is researched. It includes the visibility analysis of space object in the STK scene, the attitude description mode of object, the data alternant form and format between STK and Vega, the imaging method of the object through Vega and the visual realization of the process. ©2010 IEEE.

关键词： Space debris

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Spatial localization of concurrent multiple sound sources

Spatial localization of concurrent multiple sound sources

引用

2010 2nd International Symposium on Aware Computing, ISAC 2010

作者： Li, Huakang Saji, Akira Tanno, Keita Ma, Jun Huang, Jie Zhao, Qunfei School of Computer Science and Engineering University of Aizu Aizu-Wakamatsu 965-8580 Japan Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9781424483143

Based on the human auditory system for spatial localization theory, we proposed a spatial localization of multiple sound sources using a spherical robot head. Space sound vectors recorded by a microphone array with spatial configuration, are used to estimate the histograms of spatial arrival time difference vectors by solving the simultaneous equations in different frequency bands. The echo avoidance model based on precedence effect is used to reduce the interference of environment reverberations which provide the strong interference for phase vectors especially in small indoor environments. To integrate spatial cues of different microphone pairs, we propose a mapping method from the correlation between different microphone pairs to a 3D map corresponding to azimuth and elevation of sound sources directions. Experiments indicate that the system provides the distribution of sound source in azimuth-elevation localization, even concurrently in reverberant environments. ©2010 IEEE.

关键词： Reverberation

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

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

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2010 International Conference on Medical image Analysis and Clinical Application, MIACA 2010

作者： Xie, Jie Liu, Yang Yin, Jilin Qiu, Tiantian Huang, Yuanliang Wang, Lisheng Institute of Image Processing and Pattern Recognition Department of Automation Shanghai Jiaotong University Shanghai 200240 China Department of Dentistry Shanghai East Hospital Affiliated to Tongji University Shanghai 200120 China

ISBN: (纸本)9781424480128

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 teethridge 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. © 2010 IEEE.

关键词： Dental prostheses

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Human Gait recognition by Integrating Motion Feature and Shape Feature

Human Gait Recognition by Integrating Motion Feature and Sha...

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International Conference on Multimedia Technology

作者： Bing Sun Junchi Yan Yuncai Liu Institute of Image Processing and Pattern Recognition Shanghai Jiaotong University Shanghai China

ISBN: (纸本)9781424478712

Gait is thought to be the most effective feature for human recognition in the distance. For optimal performance, the feature should include as many different types of information as possible, so in this paper, we present an integrated feature, which integrates motion feature and shape feature based on the Bayesian theory. For motion feature, we use shape variation-based frieze pattern (SVB frieze pattern) as the basis, since it can solve the ball or backpack problems very well, then we match the SVB frieze pattern feature by dynamic time warping (DTW). For shape feature, we use gait energy image (GEI) as the basis, since it is less sensitive to the silhouette noise, then we extract further information by histograms of oriented gradients (HOG) and do the dimensionality reduction by coupled subspaces analysis (CSA) and discriminant analysis with tensor representation (DATER). The proposed approach is tested on the CMU MoBo gait database. The result shows that the proposed approach is an efficient way in increasing the accuracy.

关键词： Feature extraction Humans Shape Legged locomotion Data mining Histograms

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A hole filling algorithm for medical imaging

A hole filling algorithm for medical imaging

引用

International Conference on Information Science and Engineering (ICISE)

作者： Lv Guo Yonghui Gao Yin Li Jie Yang Institute of Image Processing and Pattern Recognition Shanghai Jiaotong University Shanghai China

Surface integrity of 3D medical imaging is crucial for surgery simulation or virtual diagnoses. However, undesirable holes often exist due to external damage on bodies or accessibility limitation on scanners. To bridge the gap, the paper proposes an algorithm of filling holes for 3D medical image data based on moving least squares (MLS) method. In the algorithm, medical data is classified into two types and procedure is designed according to the classification. The procedure consists of two steps, namely hole detection and hole completion. In completion part, the detected hole can be automatically filled by interpolation with known surrounding points. Moreover, a threshold is used to constrain the density of the completed surface, so the sampling rate on reconstructed area complies with the original data. We test our algorithm on two types of medical data and the results indicate a robust solution.

关键词： Filling Three dimensional displays Surface reconstruction Medical diagnostic imaging Arrays image reconstruction

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A fusion-based method for 3D facial gender classification

A fusion-based method for 3D facial gender classification

引用

International Conference on Computer and Automation Engineering, ICCAE

作者： Yuan Hu Jingqi Yan Pengfei Shi Institute of Image Processing and Pattern Recognition Shanghai Jiaotong University Shanghai China

ISBN: (纸本)9781424455690

In this paper, we propose a novel fusion-based gender classification method for 3D frontal neutral expression facial shape. Face landmarks, extracted from 3D face shape based on profiles and curvature, are separated as four regions. Experimental investigation to evaluate the significance of different facial regions in the task of gender classification is performed. The classification is performed by using Support Vector Machines (SVMs) based on the feature of regions. Classification results show that the upper region of face contains the highest amount of gender information. Matcher weighting fusion method is also applied to fusion the classification result of four regions. Experimental results demonstrate that fusing multiple facial features can achieve highest correct classification rate to 94.3%.

关键词： Shape Face detection Nose Facial features image databases Electronics packaging Support vector machines Support vector machine classification Humans Face recognition

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