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Deformable surface stereo tracking-by-detection using Second Order Cone Programming.

Deformable surface stereo tracking-by-detection using Second...

引用

International Conference on pattern recognition

作者： Shuhan Shen Yinqiang Zheng Yuncai Liu Institute of Image Processing and Pattern Recognition Shandong Jiaotong University China

ISBN: (纸本)9781424421749

We present a method for tracking deformable surfaces in 3D using a stereo rig. Different from traditional recursive tracking approaches that provide a strong prior on the pose for each new frame, the proposed method tracks deformable surfaces by detecting them in individual frames. In our method, the model of the surface is represented by a triangulated mesh. The constraints for model to image keypoint correspondences, together with the constraints that preserve the lengths of mesh edges, are formulated as second order cone programming (SOCP) constraints, leading this tracking-by-detection method to be an SOCP problem that can be effectively solved. Experiments on a piece of deformed paper demonstrate the capability of the proposed tracking-by-detection method.

关键词： image edge detection Deformable models image processing pattern recognition Visual servoing Augmented reality image sequences image reconstruction Shape Layout

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Spatial direction estimation for multiple sound sources in reverberation environment

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

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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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A STUDY OF MC TECHNIQUE IN HDTV

A STUDY OF MC TECHNIQUE IN HDTV

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International Conference on Communication Technology(ICCT’94)

作者： Sun Jun Liu Jianyi Yu Songyu Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong university

This paper describes the discussion and experiments on the hierarchical block matching algorithm(HBMA) which can be used in motion compensating interframe predictive coding for the HDTV *** improvements for the HBMA are proposed which yield more reliable and homogeneous displacement vector *** to the sophisticated full search block matching technique,the video compression efficiency is *** results of simulating experiment show the potential capability of applying this algorithm to the HDTV systems.

关键词： A STUDY OF MC TECHNIQUE IN HDTV frame BFD

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Determining 3D structure and motion of man-made objects from image corners

Determining 3D structure and motion of man-made objects from...

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IEEE Southwest Symposium on image Analysis and Interpretation

作者： Xiaoyun Zhang Yuncai Liu T.S. Huang Institute of Image Processing and Pattern Recognition Shanghai Jiaotong University China

ISBN: (纸本)0769515371

This paper deals with motion estimation from image corner correspondences for two cases: the orthogonal corner and the general corner with known space angles. The contribution of the paper is threefold. First, the three dimensional structure of a corner is recovered easily from its image by introducing a new coordinate system. Second, it is shown that the correspondence of one corner and two points over two views is sufficient to determine the motion uniquely, i.e., the rotation and translation. Third, experiments conducted using both simulated data and real images present good results.

关键词： Motion estimation Computer vision image reconstruction Optical computing image motion analysis Equations Shape Chromium image processing pattern recognition

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Reduced reference image quality assessment based on Weibull statistics

Reduced reference image quality assessment based on Weibull ...

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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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SALIENCY DRIVEN CLUSTERING FOR SALIENT OBJECT DETECTION

SALIENCY DRIVEN CLUSTERING FOR SALIENT OBJECT DETECTION

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IEEE International Conference on Acoustics, Speech and Signal processing

作者： Lei ZHOU YiJun LI YiPeng SONG Yu QIAO Jie YANG Institute of Image Processing and Pattern Recognition Shanghai Jiaotong University China

ISBN: (纸本)9781479928941

In this work, a novel salient object detection method is proposed based on the saliency driven clustering. To capture visual patterns of an image, the color contrast prior and boundary prior are utilized to generate the image clusters automatically. Then, a simple operation like regional saliency computation is applied to refine the saliency maps generated by two priors. The final saliency map are obtained by combining the refined contrast prior saliency and boundary prior saliency. Extensive experiments show that our proposed model achieves better performance on salient region detection against the state-of-the-art methods.

关键词： image color analysis Visualization Computational modeling Conferences pattern recognition Computer vision Object detection

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AN IMPROVED H.261 SCHEME FOR VIDEOCONFERENCE image CODING

AN IMPROVED H.261 SCHEME FOR VIDEOCONFERENCE IMAGE CODING

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1992 International Conference on Communication Technology ICCT’92

作者： YIN Li-Jun YU Song-Yu WANG Wei Institute of Image Processing & Pattern Recognition Shanghai Jiao Tong University

An improved H.261（I-H.261） scheme for videoconference image coding is presented in this *** the case of lower bitrate（p=l,2） and higher error code rate(10～10),p×64kb/s H.261（CIF） has inferior picture quality and poor noise *** view of this situation,we proposed I-H.261 which is compatable with H.261 in different levels. There are two improvements:the first,improved the control approach for the quantizer stepsize,a new control strategy for quantization is proposed;the second,improved the code table for DCT coefficients,a new code table is set,in which codeword length is quadruple and odd-even check function is *** with H.261,I-H.261 has three notable advantages:（a） It reduced the fuzziness distrotion and mosquito effect at lower bitrate（p=1,2）(b) A powerful noise immunity is achieved,the range of bit error diffusion is narrowed,（c） In the main,it's compatable with ***'s easy for implementation in resl time to use existing ASIC chips designed for H.261 and general purpose DSP chips. The excellent simualtion result is obtained at bitrate of 96kb/*** code rate of 10.

关键词： H.261 videoconference image coding

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Fault detection and isolation of sensor in time-delay systems based on space geometry method

Fault detection and isolation of sensor in time-delay system...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Dianfeng Qiao Qianshuai Cheng Yandong Hou Institute of Image Processing and Pattern Recognition Henan University Kaifeng China

ISBN: (纸本)9781467386456

This paper investigates sensor fault problems in time-delay systems with uncertain disturbances. Using the measurement equation, the sensor fault can be translated into the state inputs. Subsequently, a cluster of residual generators is designed by employing the space geometric method. The corresponding filter parameters are obtained based on the space geometric approach, then using H ∞ optimization technique reduce the effects of disturbance inputs on the residuals, at the same time, the residual generator is designed so that the residual signals and sensor faults satisfy one to one correspondence, which can be used to detect and isolate the sensor faults in time-delay systems with disturbance. Simulation results suggest the effectiveness and robustness of our proposed approach.

关键词： Conferences Industrial electronics Decision support systems Fault detection Optimization

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Spatiotemporal saliency based on distributed opponent oriented energy

Spatiotemporal saliency based on distributed opponent orient...

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International Conference on pattern recognition

作者： Yue Zhou Kun Shi Institute of Image Processing and Pattern Recognition Shanghai Jiaotong University China

ISBN: (纸本)9781467322164

A computational saliency model utilizing bio-inspired features for spatiotemporal saliency is presented in this paper. We first propose distributed opponent oriented energy for compact local dynamic texture description motivated by Human Vision System. Then, we integrate the derived motion characterization and a revised self-resemblance saliency framework. High effectiveness and efficiency of the proposed method is extensively demonstrated both qualitatively and quantitatively, for background subtraction in the cases of extremely dynamic scenes and camera jitter. In terms of the trade-off between accuracy and computation cost, our method achieves competitive results in contrast to the state-of-art algorithm.

关键词： Spatiotemporal phenomena Dynamics Computational modeling Heuristic algorithms pattern recognition Biological system modeling Cameras

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RERANKING OF PERSON RE-IDENTIFICATION BY MANIFOLD-BASED APPROACH

RERANKING OF PERSON RE-IDENTIFICATION BY MANIFOLD-BASED APPR...

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IEEE International Conference on image processing

作者： Shuai Huang Yun Gu Jie Yang Pengfei Shi Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University

ISBN: (纸本)9781479983407

Person re-identification (RE-ID) aims at associating the same pedestrian over non-overlapping surveillance scenes. A large number of approaches have emerged in recent years, and they mainly focus on designing middle or high level features to highlight the most discriminative aspects of pedestrians. Due to the nonrigid structure of pedestrians, it is difficult to reidentify pedestrians by low-level features. We investigate the results of conventional person RE-ID approaches, and find that the inadequate utilization of low-level features lead to the poor performance. In this work, we propose a novel framework to utilize the low-level visual features in a more effective way. Given a result obtained from the conventional person RE-ID method, the framework returns a more reasonable result. The framework is extended from the manifold ranking method, and several adjustments are made taking the requirements of person RE-ID into consideration. Our framework is validated through experiments on two person RE-ID datasets (VIPeR and ETHZ), and results from four different conventional approaches show significant improvement.

关键词： Re-identification Manifold Reranking Manifolds Pedestrians LOW LEVEL Persons Frameworks

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