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Effective camera motion analysis approach

Effective camera motion analysis approach

引用

2010 International Conference on Networking, Sensing and Control, ICNSC 2010

作者： Ma, Shugao Wang, Weiqiang Graduate University of Chinese Academy of Sciences Beijing China Key Lab. of Intelligent Information Processing Institute of Computer Technology Chinese Academy of Sciences China

ISBN: (纸本)9781424464531

Camera motion analysis (CMA) is very useful for many video content analysis tasks, but few works competently handle the videos with significant camera or object motion. In this paper, we present an effective CMA approach for such challenging cases. The effectiveness of our approach comes from two aspects: (1) reliably matching keypoints on consecutively sampled frames, where both the appearance similarity and motion smoothness of keypoints are considered;(2) effectively distinguishing background keypoints from foreground ones by a novel and advanced voting process, where the voting weights of keypoints are dynamically adjusted to guarantee that the influence of foreground motion can be largely reduced in CMA. Thus, a parametric camera motion model can be naturally derived by the accurate estimation of the motion of background keypoints. The experimental results on the TRECV2005 dataset and 500 shots from seven classic action movies demonstrate the effectiveness of our approach. ©2010 IEEE.

关键词： Motion analysis

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A high efficient in-place transposition scheme for multidimensional arrays

A high efficient in-place transposition scheme for multidime...

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3rd International Conference on Information and Computing, ICIC 2010

作者： Yuan, Jie Wu, Jian-Ping Wang, Zheng-Hua National Lab. of Parallel and Distributed Processing National University of Defense Technology Changsha China School of Computer Science National University of Defense Changsha China

ISBN: (纸本)9780769540474

This paper presents a in-place cycle-reducing method for multidimensional arrays transposition in local memory to reduce the memory R/W operations. The resulting method can significantly reduce the number of subcycles (also called following-cycles) and that of memory operations for square arrays. Taking square array 256 by 256 for example, the number of subcycles used by current availab.e best algorithm can be reduced from 32894 to only 574, using our new method, and the memory operation number can be reduced by about 32.58%, from 98430 to 66366. Taking advantage of this new method, the elapsed time can be reduced as a result. The number of cycles and operations can also be reduced for 2D rectangle arrays with 2m rows and 2n column stored in column-major, especially n=2m, even though the improvement is not as significant as that for square arrays. The improved 2D in-place algorithm has been extended to 3D arrays, and some theoretic and numerical results are also provided. Furthermore, we develop a new in-place 3D arrays transposition algorithm. This algorithm is very important for a deep research for multidimensional arrays. Experimental results show that our algorithm can improve efficiency significantly, compared to some other 3D array transposition schemes. © 2010 IEEE.

关键词： Multidimensional array Memory operation Cycle-reducing Transposition In-place transposition Transposition arrays three-dimensional array Local Memory MULTIDIMENSIONAL

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Parallel transposing and communication strategies for FFT on cluster of SMP architectures with multicore processors

Parallel transposing and communication strategies for FFT on...

引用

Congress on Image and signal processing, CISP

ISBN: (纸本)9781424465149

This paper presents a high performance parallel formulation for 1-D FFT based on transpose algorithm. The parallel scheme of FFT trades off some efficiency for a more consistent level of parallel performance. It involves matrix transposition, and a new in-place transposing algorithm is introduced into the parallel matrix transposition to improve the efficiency. Depending on the size of the input n, the number of processes p, and the memory or network bandwidth, this method can achieve better parallel performance than the other on cluster of SMP architectures. Test shows us that our scheme can achieve a good speedup. ©2010 IEEE.

关键词： Fast Fourier transforms

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Edge-adaptive transforms for efficient depth map coding

Edge-adaptive transforms for efficient depth map coding

引用

28th Picture Coding Symposium, PCS 2010

作者： Shen, G. Kim, W.-S. Narang, S.K. Ortega, A. Lee, Jaejoon Wey, HoCheon Signal and Image Processing Institute University of Southern California United States Multimedia Lab. Samsung Advanced Institute of Technology Samsung Electronics Co. Ltd. Korea Republic of

ISBN: (纸本)9781424471348

In this work a new set of edge-adaptive transforms (EATs) is presented as an alternative to the standard DCTs used in image and video coding applications. These transforms avoid filtering across edges in each image block, thus, they avoid creating large high frequency coefficients. These transforms are then combined with the DCT in H.264/AVC and a transform mode selection algorithm is used to choose between DCT and EAT in an RD-optimized manner. These transforms are applied to coding depth maps used for view synthesis in a multi-view video coding system, and provides up to 29% bit rate reduction for a fixed quality in the synthesized views. © 2010 IEEE.

关键词： Image coding

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Panoramic scene generation from multi-view images with close foreground objects

Panoramic scene generation from multi-view images with close...

引用

28th Picture Coding Symposium, PCS 2010

作者： Lee, Soon-Young Sim, Jae-Young Kim, Chang-Su Lee, Sang-Uk Signal Processing Lab. School of Electrical Engineering and INMC Seoul National University Korea Republic of School of Electrical and Computer Engineering UNIST Korea Republic of School of Electrical Engineering Korea University Korea Republic of

ISBN: (纸本)9781424471348

An algorithm to generate a panorama from multi-view images, which contain foreground objects with varying depths, is proposed in this work. The proposed algorithm constructs a foreground panorama and a background panorama separately, and then merges them into a complete panorama. First, the foreground panorama is obtained by finding the translational displacements of objects between source images. Second, the background panorama is initialized using warped source images and then optimized to preserve spatial consistency and satisfy visual constraints. Then, the background panorama is extended by inserting seams and merged with the foreground panorama. Experimental results demonstrate that the proposed algorithm provides visually satisfying panoramas with all meaningful foreground objects, but without severe artifacts in the backgrounds. © 2010 IEEE.

关键词： Image processing

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Pipelined analog-digital converters integral nonlinearity modeling for post-correction

Pipelined analog-digital converters integral nonlinearity mo...

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17th Symposium IMEKO TC4 - Measurement of Electrical Quantities, 15th International Workshop on ADC Modelling and Testing, and 3rd Symposium IMEKO TC19 - Environmental Measurements

作者： Medawar, Samer Händel, Peter Björsell, Niclas Jansson, Magnus Signal Processing Lab. ACCESS Linnaeus Center Royal Institute of Technology SE-100 44 Stockholm Sweden Department of Electronics University of Gävle SE-801 76 Gävle Sweden

ISBN: (纸本)9781617823381

An input-dependent integral nonlinearity (INL) model is developed for pipeline ADC post-correction. The INL model consists of a static and dynamic part. The INL model is subtracted from the ADC digital output for compensation. Static compensation is performed by adjacent sets of gains and offsets. Each set compensates a certain output code range. The frequency content of the INL dynamic component is used to design a set of filter blocks that performs ADC compensation in the time domain. The compensation scheme is applied to measured data of two 12-bit ADCs of the same type (Analog Devices AD9430). Significant performance improvements in terms of spurious free dynamic range (SFDR) are obtained.

关键词： Analog to digital conversion

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A sample pre-mapping method enhancing boosting for object detection

A sample pre-mapping method enhancing boosting for object de...

引用

International Conference on Pattern Recognition

作者： Ren, Haoyu Hong, Xiaopeng Heng, Cher-Keng Liang, Luhong Chen, Xilin Key Lab. of Intelligent Information Processing of Chinese Academy of Sciences Institute of Computing Technology CAS China School of Computer Science and Technology Harbin Institute of Technology Panasonic Singapore Laboratories Pte Ltd.

ISBN: (纸本)9780769541099

We propose a novel method to improve the training efficiency and accuracy of boosted classifiers for object detection. The key step of the proposed method is a sample pre-mapping on original space by referring to the selected 'reference sample' before feeding into weak classifiers. The reference sample corresponds to an approximation of the optimal separating hyper-plane in an implicit high-dimensional space, so that the resulting classifier could achieve the performance similar to kernel method, while spending the computation cost of linear classifier in both training and detection. We employ two different non-linear mappings to verify the proposed method under boosting framework. Experimental results show that the proposed approach achieves performance comparable with the common-used methods on public datasets in both pedestrian detection and car detection. © 2010 IEEE.

关键词： Object detection

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Partner selection strategy in cooperative diversity systems

Partner selection strategy in cooperative diversity systems

引用

International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Guomin, Li Guisheng, Liao National Key Lab. for Radar Signal Processing Xidian Univ. Xi'an Shaanxi 710071 China School of Communication and Information Engineering Xi'an University of Science and Technology Xi'an Shaanxi 710054 China

ISBN: (纸本)9781424437092

In this paper, a novel strategy for partner selection in cooperative communication system is proposed. The system model is constructed based on the user distribution in the circular area. And then the performance of the present selection method is investigated under the constraint of cooperative gain. The simulation results show that the frame error rate of the method is superior to the random selection in the cooperative area. © 2010 IEEE.

关键词： Cooperative communication

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Improved estimate of parametric models for analogue to digital converters by using weighted integral nonlinearity data

Improved estimate of parametric models for analogue to digit...

引用

17th Symposium IMEKO TC4 - Measurement of Electrical Quantities, 15th International Workshop on ADC Modelling and Testing, and 3rd Symposium IMEKO TC19 - Environmental Measurements

作者： Björsell, Niclas Händel, Peter Jansson, Magnus Medawar, Samer University of Gävle ITB/Electronics SE-801 76 Gävle Sweden Signal Processing Lab. ACCESS Linnaeus Center Royal Institute of Technology SE-100 44 Stockholm Sweden

ISBN: (纸本)9781617823381

Error modelling has played a major role in generating post-corrections of analogue to digital converters (ADC). Benefits by using parametric models for post-correction are that they requires less memory and that they are easier to identify for arbitrary signals. However, the parameters are estimated in two steps;firstly, the integral nonlinearity (INL) is estimated and secondly, the model parameters. In this paper we propose a method to improve the performance in the second step, by utilizing information about the statistical properties of the first step.

关键词： Analog to digital conversion

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Boosted sigma set for pedestrian detection

Boosted sigma set for pedestrian detection

引用

International Conference on Pattern Recognition

作者： Hong, Xiaopeng Chang, Hong Chen, Xilin Gao, Wen School of Computer Science and Technology Harbin Institute of Technology China Key Lab. of Intelligent Information Processing Chinese Academy of Sciences Institute of Computing Technology China Institute of Digital Media Peking University China

ISBN: (纸本)9780769541099

This paper presents a new method to detect pedestrian in still image using Sigma sets as image region descriptors in the boosting framework. Sigma set encodes second order statistics of an image region implicitly in the form of a point set. Compared with the covariance matrix, the traditional second order statistics based region descriptor, which requires computationally demanding operations based on Riemannian manifold, Sigma set preserves similar robustness and discriminative power more efficiently because the classification on Sigma sets can be directly performed in vector space. Experimental results on the INRIA and the Daimler Chrysler pedestrian datasets show the effectiveness and efficiency of the proposed method. © 2010 IEEE.

关键词： Covariance matrix

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