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2012 9th Conference on computer and Robot Vision, CRV 2012

作者： Abdelrahman, Mostafa El-Melegy, Moumen Farag, Aly Computer Vision and Image Processing Laboratory University of Louisville Louisville KY 40292 United States Electrical Engineering Department Assiut University Assiut 71516 Egypt

ISBN: (纸本)9780769546834

One of the major goals of computer vision and machine intelligence is the development of flexible and efficient methods for shape representation. This paper presents an approach for shape retrieval based on sparse representation of scale-invariant heat kernel. We use the Lap lace-Beltrami eigen functions to detect a small number of critical points on the shape surface. Then a shape descriptor is formed based on the heat kernels at the detected critical points for different scales, combined with the normalized eigen values of the Lap lace-Beltrami operator. Sparse representation is used to reduce the dimensionality of the calculated descriptor. The proposed descriptor is used for classification via the collaborative representation-based classification with regularized least square algorithm. We compare our approach to two well-known approaches on two different data sets: the nonrigid world data set and the SHREC 2011. The results have indeed confirmed the improved performance of the proposed approach, yet reducing the time and space complicity of the shape retrieval problem. © 2012 IEEE.

关键词： computer vision

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Modified full abundance-constrained spectral unmixing

Modified full abundance-constrained spectral unmixing

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High-Performance Computing in Remote Sensing II

作者： Wong, Englin Chang, Chein-I Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD 21250 United States

ISBN: (纸本)9780819492791

Abundance fully constrained least squares (FLCS) method has been widely used for spectral unmixing. A modified FCLS (MFCLS) was previously proposed for the same purpose to derive two iterative equations for solving fully abundance-constrained spectral unmixing problems. Unfortunately, its advantages have not been recognized. This paper conducts a comparative study and analysis between FCLS and MFCLS via custom-designed synthetic images and real images to demonstrate that while both methods perform comparably in unmixing data, MFCLS edges out FCLS in less computing time. © 2012 SPIE.

关键词： Iterative methods

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Correction to “An Azimuth-Dependent Phase Gradient Autofocus (APGA) Algorithm for Airborne/Stationary BiSAR Imagery” [Nov 13 1290-1294]

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IEEE Geoscience and Remote Sensing Letters 2013年第6期10卷 1622-1622页

作者： Song Zhou Mengdao Xing Xiang-Gen Xia Yachao Li Lei Zhang Zheng Bao National Key Laboratory of Radar Signal Processing Xidian University Xi'an China Department of Electrical and Computer Engineering University of Delaware Newark DE USA

In the above paper (ibid., vol. 10, no, 6, pp. 1290-1294, Nov. 2013), there is an error in equation (5). The correction is presented here.

关键词： Azimuth Synthetic aperture radar Geophysical measurements Airborne radar

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Tracking articulator movements using orientation measurements

Tracking articulator movements using orientation measurement...

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2012 3rd IEEE/IET International Conference on Audio, Language and Image processing, ICALIP 2012

作者： Ji, An Johnson, Michael T. Berry, Jeffrey Marquette University Department of Electrical and Computer Engineering Speech and Signal Processing Laboratory P. O. Box 1881 Milwaukee WI 53201-1881 United States

ISBN: (纸本)9781467301718

This paper introduces a new method to track articulator movements, specifically jaw position and angle, using 5 degree of freedom (5 DOF) orientation data. The approach uses a quaternion rotation method to accomplish this jaw tracking during speech using a single senor on the mandibular incisor. Data were collected using the NDI Wave Speech Research System for one pilot subject with various speech tasks. The degree of jaw rotation from the proposed approach is compared with traditional geometric calculation. Results show that the quaternion based method is able to describe jaw angle trajectory and gives more accurate and smooth estimation of jaw kinematics. © 2012 IEEE.

关键词： Degrees of freedom (mechanics)

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Features for Phoneme Independent Speaker Identification

Features for Phoneme Independent Speaker Identification

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International Conference on Audio, Language and Image processing

作者： Jianglin Wang An Ji Michael T. Johnson Speech and Signal Processing Laboratory Department of Electrical and Computer Engineering Marquette University Speech and SignalProcessing Laboratory Department of Electrical and Computer Engineering Marquette University

ISBN: (纸本)9781467301732

This paper describes a unique cross-phoneme speaker identification experiment, using deliberately mismatched phoneme sets for training and testing. The underlying goal is to identify features that represent broad individually unique characteristics rather than those that represent phonetic differences, as are more typical of modern speaker identification and verification systems. A wide range of features are proposed and evaluated within this context using a Gaussian Mixture Model framework. The results show that log-area ratio has better phonetic independence than MFCCs, that residual phase carries substantial speaker information, and identifies several other features that also have usefulness for speaker identification independent of phonetic content.

关键词： speaker recognition Mel frequency cepstral coefficient phonetics verification system

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Nonlinear state feedback control for a class of polynomial discrete-time systems with norm-bounded uncertainties: An integrator approach

Nonlinear state feedback control for a class of polynomial d...

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7th IFAC Symposium on Robust Control Design, ROCOND'12

作者： Saat, Shakir Nguang, Sing Kiong Huang, Dan Swain, Akshya Department of Electrical and Computer Engineering University of Auckland 92019 Auckland New Zealand Key Laboratory of System Control and Information Processing Shanghai Jiao Tong University Ministry of Education Shanghai 200240 China

ISBN: (纸本)9783902823038

This paper investigates the problem of designing a nonlinear state feedback controller for a class of uncertain polynomial discrete-time systems using rational Lyapunov functions. The uncertainty that under consideration is modelled as a norm-bounded uncertainty. In general, the problem of designing a controller for polynomial discrete-time systems cannot be formulated as a convex problem. This is due to the fact that the Lyapunov function and the control input is not jointly convex, hence it cannot be solved by a semi definite programming (SDP). In this paper, we propose a novel approach where an integrator is introduced to convexify the nonconvex controller design problem, so that it can be solved easily by SDP. Furthermore, based on the sum of squares approach, sufficient conditions for the existence of a rational polynomial state feedback controller for a polynomial discrete-time systems are given in terms of solvability of polynomial matrix inequalities. These inequalities are then solved by the recently developed sum of squares (SOS) solvers. Finally, numerical example is provided to demonstrate the validity of this integrator approach. © 2012 IFAC.

关键词： Polynomials

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A Discussion in Favor of Dynamic Scheduling for Regular Applications in Many-core Architectures

A Discussion in Favor of Dynamic Scheduling for Regular Appl...

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IEEE International Symposium on parallel and Distributed processing Workshops and Phd Forum (IPDPSW)

作者： Elkin Garcia Daniel Orozco Robert Pavel Guang R. Gao Computer Architecture and Parallel System Laboratory (CAPSL) Electrical and Computer Engineering Department University of Delaware Newark DE USA

ISBN: (纸本)9781467309745

The recent evolution of many-core architectures has resulted in chips where the number of processor elements (PEs) are in the hundreds and continue to increase every day. In addition, many-core processors are more and more frequently characterized by the diversity of their resources and the way the sharing of those resources is arbitrated. On such machines, task scheduling is of paramount importance to orchestrate a satisfactory distribution of tasks with an efficient utilization of resources, especially when fine-grain parallelism is desired or required. In the past, the primary focus of scheduling techniques has been on achieving load balancing and reducing overhead with the aim to increase total performance. This focus has resulted in a scheduling paradigm where Static Scheduling (SS) is preferred to Dynamic Scheduling (DS) for highly regular and embarrassingly parallel applications running on homogeneous architectures. We have revisited the task scheduling problem for these types of applications under the scenario imposed by many-core architectures to investigate whether or not there exists scenarios where DS is better than SS. Our main contribution is the idea that, for highly regular and embarrassingly parallel applications, DS is preferable to SS in some situations commonly found in many-core architectures. We present experimental evidence that shows how the performance of SS is degraded by the new environment on many-core chips. We analyze three reasons that contribute to the superiority of DS over SS on many-core architectures under the situations described: 1) A uniform mapping of work to processors without considering the granularity of tasks is not necessarily scalable under limited amounts of work. 2) The presence of shared resources (i.e. the crossbar switch) produces unexpected and stochastic variations on the duration of tasks that SS is unable to manage properly. 3) Hardware features, such as in-memory atomic operations, greatly contribute to decrea

关键词： Tiles computer architecture Dynamic scheduling Random access memory Throughput Hardware Instruction sets

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Adaptive image compression using sparse dictionaries

Adaptive image compression using sparse dictionaries

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International Conference on Systems, Signals and Image processing, IWSSIP

作者： Inbal Horev Ori Bryt Ron Rubinstein Department of Electrical Engineering Signal and Image Processing Laboratory Haifa Israel Department of Computer Science Geometric Image Processing Laboratory Haifa Israel

Transform coding is a widely used image compression technique, where entropy reduction can be achieved by decomposing the image over a dictionary which provides compaction. Existing algorithms, such as JPEG and JPEG2000, utilize fixed dictionaries which are shared by the encoder and decoder. Recently, works utilizing content-specific dictionaries show promising results by focusing on specific classes of images and using highly specialized dictionaries. However, such approaches lose the ability to compress arbitrary images. In this paper we propose an input-adaptive compression approach, which encodes each input image over a dictionary specifically trained for it. The scheme is based on the sparse dictionary structure, whose compact representation allows relatively low-cost transmission of the dictionary along with the compressed data. In this way, the process achieves both adaptivity and generality. Our results show that although this method involves transmitting the dictionary, it remains competitive with the JPEG and JPEG2000 algorithms.

关键词： Dictionaries Image coding Transform coding PSNR Sparse matrices Encoding Bit rate

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A two-piece R-D model for hybrid video coding and its application in fast mode decision

A two-piece R-D model for hybrid video coding and its applic...

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2012 13th IEEE International Conference on Multimedia and Expo, ICME 2012

作者： Aminlou, Alireza Fahim-Hashemi, Hana Hashemi, Mahmoud Reza Gabbouj, Moncef Fatemi, Omid Multimedia Processing Laboratory School of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Signal Processing Tampere University of Technology Tampere Finland Viterbi School of Engineering University of Southern California Los Angeles CA United States Nano-Electronic Center of Excellence University of Tehran Tehran Iran

ISBN: (纸本)9781467316590

The mode decision process has a significant effect on the quality and complexity of a video encoder. The conventional method that fully codes each macro block for different modes results in the best quality performance, but it suffers from high computational complexity. On the other hand, some other methods ignore the residual part and use the prediction data, or adopt early mode selection approaches in order to reduce the computational cost. These approaches have a negative impact on the coding performance. In this paper, we have used a simple model for the residual coding part and proposed a two-piece R-D model for a macro block. Based on this model, we have introduced a mode decision algorithm that reduces the bit-rate by up to 11.62% at the expense of just 0.5% computational overhead. © 2012 IEEE.

关键词： Cost reduction

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Toward full fluctuation analysis of small FETs

Toward full fluctuation analysis of small FETs

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International Meeting for Future of Electron Devices

作者： Yiming Li Hui-Wen Cheng Parallel and Scientific Computing Laboratory Department of Electrical and Computer Engineering National Chiao Tung University Hsinchu Hsinchu Taiwan

We, for the first time, estimate total fluctuation resulting from random dopants, interface traps and work functions using experimentally calibrated 3D statistical device simulation on 16-nm-gate high-κ/metal gate planar and bulk FinFET devices. The total full 3D simulated threshold voltage fluctuation (σV th ), induced by the aforementioned random sources simultaneously, is different from their statistical total sum because the assumption of independently and identically distributed random variables is invalid owing to strong surface potential's interactions among them. Structural innovation using bulk FinFET implies significant fluctuation suppression, which is about 45.6% reduction on σV th . 3D vertical channel-based device provides good capability in fluctuation reduction, compared with process efforts on low interface trap density (e.g., D it is below 10 11 eV -1 cm -2 ) and small grain size (e.g., 1×1 nm 2 ) of metal gate on planar one.

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