News & Events

393 were found.


  •  NEWS   International Workshops APPROX/RANDOM 2012: publication by Petros T. Boufounos and others
    Date: August 15, 2012
    Where: International Workshops APPROX/RANDOM
    MERL Contact: Petros Boufounos
    Research Areas: Multimedia, Computational Sensing
    Brief
    • The paper "What's the Frequency, Kenneth?: Sublinear Fourier Sampling Off the Grid" by Boufounos, P., Cevher, V., Gilbert, A.C., Li, Y. and Strauss, M.J. was presented at the International Workshops APPROX/RANDOM
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  •  NEWS   SPIE Conference on Applications of Digital Image Processing 2012: publication by Anthony Vetro and Dong Tian
    Date: August 12, 2012
    Where: SPIE Conference on Applications of Digital Image Processing
    MERL Contacts: Dong Tian; Anthony Vetro
    Research Areas: Multimedia, Digital Video
    Brief
    • The paper "Analysis of 3D and Multiview Extensions of the Emerging HEVC Standard" by Vetro, A. and Tian, D. was presented at the SPIE Conference on Applications of Digital Image Processing
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  •  TALK   Communication Systems for Oilfield Applications
    Date & Time: Tuesday, August 7, 2012; 12:00 PM
    Speaker: Dr. Julius Kusuma, Schlumberger-Doll Research
    MERL Host: Petros Boufounos
    Research Area: Multimedia
    Brief
    • The oilfield is a rich area for research and engineering in communication and signal processing. Communication over non-standard channels, using constrained sources, noisy environments, and limited computational and energy resources, are some of the key challenges in this domain. In this talk I will give an introduction first on the role of science and technology, in particular communication and signal processing, in the oilfield. Due to its unique role in the industry, Schlumberger has a rich variety of communication systems over EM wireless, wired, acoustic, and even fluid pressure channels.

      In this talk we give a brief tour of some of the state-of-the-art and showcase how technology has revolutionized the practice of the industry, enabling innovations such as horizontal drilling, logging-while-drilling, and well-placement. At the same time, we give a tutorial on how the lifecycle of a reservoir is managed, including imaging, drilling, logging, sampling, testing, and completing. Throughout, we will show how communication has revolutionized the practice in the industry.
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  •  TALK   Nonparametric Bayesian Latent Variable Models
    Date & Time: Friday, July 27, 2012; 12:00 PM
    Speaker: Mingyuan Zhou, Duke University
    MERL Host: Dehong Liu
    Research Area: Multimedia
    Brief
    • Bayesian nonparametrics, using stochastic processes as prior distributions, is a relatively young and rapidly growing research area in statistics and machine learning. In this talk, we first briefly review completely random measures, a family of pure-jump non-negative stochastic processes that are simple to construct and amenable for posterior computation. We then present nonparametric Bayesian latent variable models based on the beta process, Bernoulli process, gamma process, Poisson process, and in particular, the negative binomial process. Specifically, for continuous data, we discuss dictionary learning with the beta-Bernoulli process and dependent hierarchical beta process, and for count data, we present the beta-negative binomial process and Poisson factor analysis. Furthermore, we discuss how the seeming disjoint count and mixture modelings can be united under the negative binomial processes framework, providing new opportunities to build mixture and hierarchical mixture models with better data fitting, more efficient inference and more flexible model constructions. We show successful applications of our nonparametric Bayesian latent variable models to image processing, topic modeling and count data analysis.
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  •  NEWS   IEEE Transactions on Information Forensics and Security: publication by Ye Wang, Shantanu D. Rane and others
    Date: July 24, 2012
    Where: IEEE Transactions on Information Forensics and Security
    MERL Contact: Ye Wang
    Research Areas: Multimedia, Information Security
    Brief
    • The article "A Theoretical Analysis of Authentication, Privacy, and Reusability Across Secure Biometric Systems" by Wang, Y., Rane, S., Draper, S.C. and Ishwar, P. was published in IEEE Transactions on Information Forensics and Security
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  •  NEWS   IGARSS 2012: publication by Petros T. Boufounos and Dehong Liu
    Date: July 22, 2012
    Where: IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
    MERL Contacts: Dehong Liu; Petros Boufounos
    Research Areas: Multimedia, Digital Video, Computational Sensing
    Brief
    • The paper "Pan-Sharpening with Multi-scale Wavelet Dictionary" by Liu, D. and Boufounos, P.T. was presented at the IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
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  •  NEWS   ICME 2012: publication by Shantanu D. Rane and others
    Date: July 9, 2012
    Where: IEEE International Conference on Multimedia and Expo (ICME)
    Research Areas: Multimedia, Information Security
    Brief
    • The paper "A Distance-sensitive Attribute Based Cryptosystem for Privacy-Preserving Querying" by Sun, W. and Rane, S. was presented at the IEEE International Conference on Multimedia and Expo (ICME)
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  •  TALK   Quadratic Gaussian Multiterminal Source Coding
    Date & Time: Friday, July 6, 2012; 12:00 PM
    Speaker: Zixiang Xiong, Texas A&M University
    MERL Host: Anthony Vetro
    Research Area: Multimedia
    Brief
    • Driven by a host of emerging applications, distributed source coding has assumed renewed interest in the past decade. Although the Slepian-Wolf theorem has been known for almost 40 years and progresses have been made recently on the rate region of quadratic Gaussian two-terminal source coding, finding the sum-rate bound of quadratic Gaussian multiterminal source coding with more than two terminals is still an open problem. In this talk, I'll briefly go over existing results on distributed source coding problems before describing a set of new results we obtained recently.
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  •  TALK   Sparse projections onto convex sets
    Date: Tuesday, July 3, 2012
    Speaker: Prof. Volkan Cevher, EPFL
    MERL Host: Petros Boufounos
    Research Area: Multimedia
    Brief
    • Many natural and man-made signals exhibit a few degrees of freedom relative to their dimension due to natural parameterizations or constraints. The inherent low-dimensional structure of such signals are mathematically modeled via combinatorial and geometric concepts, such as sparsity, unions-of-subspaces, or spectral sets, and are now revolutionizing the way we address linear inverse problems from incomplete data.

      In this talk, we describe a set of structured sparse models for constrained linear inverse problems that feature exact and epsilon-approximate projections in polynomial time. We pay particular attention to the sparsity models based on matroids, multi-knapsack, and clustering as well as spectrally constrained models. We then study sparse projections onto convex sets, such as the (general) simplex, and ell-1,2,inf balls. Finally, we describe a hybrid optimization framework which explicitly leverages these non-convex models along with additional convex constraints to obtain better recovery performance in compressive sensing, learn interpretable sparse densities from finite samples, and improved sparse Markowitzs portfolios with better return/cost performance.
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  •  NEWS   PCS 2012: publication by Anthony Vetro, Robert A. Cohen, Huifang Sun and others
    Date: May 7, 2012
    Where: Picture Coding Symposium (PCS)
    MERL Contacts: Robert Cohen; Anthony Vetro; Huifang Sun
    Research Areas: Multimedia, Digital Video
    Brief
    • The paper "Predictive Coding of Intra Prediction Modes for High Efficiency Video Coding" by Xu, X., Cohen, R., Vetro, A. and Sun, H. was presented at the Picture Coding Symposium (PCS)
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  •  NEWS   IWSML 2012: publication by Jonathan Le Roux, John R. Hershey and others
    Date: March 31, 2012
    Where: International Workshop on Statistical Machine Learning for Speech Processing (IWSML)
    MERL Contacts: Jonathan Le Roux; John Hershey
    Research Areas: Multimedia, Speech & Audio
    Brief
    • The paper "Latent Dirichlet Reallocation for Term Swapping" by Heaukulani, C., Le Roux, J. and Hershey, J.R. was presented at the International Workshop on Statistical Machine Learning for Speech Processing (IWSML)
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  •  EVENT   ICASSP 2012 - Special Session on Signal-Processing Challenges and Opportunities in Depth Cameras
    Date & Time: Friday, March 30, 2012; 2:00 PM - 4:00 PM
    MERL Contact: Anthony Vetro
    Location: Kyoto, Japan
    Research Area: Multimedia
    Brief
    • Anthony Vetro co-organized a Special Session of ICASSP 2012 on Signal-Processing Challenges and Opportunities in Depth Cameras. ICASSP 2012 will be held in Kyoto, Japan, in March 2012.
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  •  NEWS   ICASSP 2012: 8 publications by Petros T. Boufounos, Dehong Liu, John R. Hershey, Jonathan Le Roux and Zafer Sahinoglu
    Date: March 25, 2012
    Where: IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
    MERL Contacts: Dehong Liu; Jonathan Le Roux; Petros Boufounos; John Hershey
    Research Areas: Multimedia, Electronics & Communications
    Brief
    • The papers "Dictionary Learning Based Pan-Sharpening" by Liu, D. and Boufounos, P.T., "Multiple Dictionary Learning for Blocking Artifacts Reduction" by Wang, Y. and Porikli, F., "A Compressive Phase-Locked Loop" by Schnelle, S.R., Slavinsky, J.P., Boufounos, P.T., Davenport, M.A. and Baraniuk, R.G., "Indirect Model-based Speech Enhancement" by Le Roux, J. and Hershey, J.R., "A Clustering Approach to Optimize Online Dictionary Learning" by Rao, N. and Porikli, F., "Parametric Multichannel Adaptive Signal Detection: Exploiting Persymmetric Structure" by Wang, P., Sahinoglu, Z., Pun, M.-O. and Li, H., "Additive Noise Removal by Sparse Reconstruction on Image Affinity Nets" by Sundaresan, R. and Porikli, F. and "Depth Sensing Using Active Coherent Illumination" by Boufounos, P.T. were presented at the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
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  •  NEWS   ASJ 2012: publication by Jonathan Le Roux and John R. Hershey
    Date: March 13, 2012
    Where: Acoustical Society of Japan Spring Meeting (ASJ)
    MERL Contacts: Jonathan Le Roux; John Hershey
    Research Areas: Multimedia, Speech & Audio
    Brief
    • The paper "Speech Enhancement by Indirect VTS" by Le Roux, J. and Hershey, J.R. was presented at the Acoustical Society of Japan Spring Meeting (ASJ)
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  •  NEWS   IEEE Transactions on Information Theory: publication by Petros T. Boufounos
    Date: February 27, 2012
    Where: IEEE Transactions on Information Theory
    MERL Contact: Petros Boufounos
    Research Areas: Multimedia, Computational Sensing
    Brief
    • The article "Universal Rate-Efficient Scalar Quantization" by Boufounos, P.T. was published in IEEE Transactions on Information Theory
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  •  TALK   Learning Intermediate-Level Representations of Form and Motion from Natural Movies
    Date & Time: Wednesday, February 22, 2012; 11:00 AM
    Speaker: Dr. Charles Cadieu, McGovern Institute for Brain Research, MIT
    MERL Host: Jonathan Le Roux
    Research Areas: Multimedia, Speech & Audio
    Brief
    • The human visual system processes complex patterns of light into a rich visual representation where the objects and motions of our world are made explicit. This remarkable feat is performed through a hierarchically arranged series of cortical areas. Little is known about the details of the representations in the intermediate visual areas. Therefore, we ask the question: can we predict the detailed structure of the representations we might find in intermediate visual areas?

      In pursuit of this question, I will present a model of intermediate-level visual representation that is based on learning invariances from movies of the natural environment and produces predictions about intermediate visual areas. The model is composed of two stages of processing: an early feature representation layer, and a second layer in which invariances are explicitly represented. Invariances are learned as the result of factoring apart the temporally stable and dynamic components embedded in the early feature representation. The structure contained in these components is made explicit in the activities of second-layer units that capture invariances in both form and motion. When trained on natural movies, the first-layer produces a factorization, or separation, of image content into a temporally persistent part representing local edge structure and a dynamic part representing local motion structure. The second-layer units are split into two populations according to the factorization in the first-layer. The form-selective units receive their input from the temporally persistent part (local edge structure) and after training result in a diverse set of higher-order shape features consisting of extended contours, multi-scale edges, textures, and texture boundaries. The motion-selective units receive their input from the dynamic part (local motion structure) and after training result in a representation of image translation over different spatial scales and directions, in addition to more complex deformations. These representations provide a rich description of dynamic natural images, provide testable hypotheses regarding intermediate-level representation in visual cortex, and may be useful representations for artificial visual systems.
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  •  TALK   User-guided 2D-to-3D Conversion
    Date & Time: Tuesday, February 21, 2012; 12:00 PM
    Speaker: Dimitri Androutsos, Richard Rzeszutek, Ryerson University
    MERL Host: Anthony Vetro
    Research Area: Multimedia
    Brief
    • The problem of converting monoscopic footage into stereoscopic or multi-view content is inherently difficult and ill-posed. On the surface, this does not appear to be the case as the problem may be summed up as, "Given single-view image or video, create one or more views as if they were taken from a different camera view." However, capturing a three-dimensional scene as a two-dimensional image is a lossy process and any information regarding the distance of objects to the camera is lost. Methods exist for extracting depth information from a monoscopic view and it is possible to obtain metrically-correct depth estimates under certain conditions. But since conversion is primarily used as a post-processing stage in film production, the user requires a degree of control over the results. This, in turn, makes it ill-posed as there is no way to know ahead of time what the user wants from the conversion. In this talk we will present the work being done at Ryerson University on user-guided 2D-to-3D conversion. In particular, we will focus on how existing image segmentation techniques may be combined to produce reasonable depth maps for conversion while still providing complete control to the user. We will also discuss how our research can be applied to both images and video without any significant alterations to our methods.
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  •  EVENT   99th MPEG meeting
    Date: Monday, February 6, 2012 - Friday, February 10, 2012
    MERL Contact: Anthony Vetro
    Location: San Jose, CA
    Research Area: Multimedia
    Brief
    • MERL is a sponsor for the 99th MPEG meeting to be held in San Jose, CA, in February 2012. MERL researcher Anthony Vetro serves as Head of the US Delegation to MPEG.
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  •  TALK   Secure Computation and Interference in Networks: Performance Limits and Efficient Protocols
    Date & Time: Wednesday, January 4, 2012; 12:00 PM
    Speaker: Dr. Ye Wang, AgaMatrix, Inc.
    Research Area: Multimedia
    Brief
    • In the field of Secure Multi-party Computation, the general objective is to design protocols that allow a group of parties to securely compute functions of their collective private data, while maintaining privacy (in that no parties reveal any more information about their personal data than necessary) and ensuring correctness (in that no parties can disrupt or influence the computation beyond the affect of changing their input data). Information theoretic approaches toward this broad problem, that provide provable (unconditional) security guarantees (even against adversaries that have unbounded computational power), have established that general computation is possible in a variety of scenarios. However, these general solutions are not always the most efficient or finely tuned to the requirements of specific problems and applications.

      In this talk, we will overview our work toward the development of efficient information theoretic approaches for secure multi-party computation applications within the common theme of secure computation and inference over a distributed data network. These applications include:

      1) private information retrieval, where the objective is to privately obtain data without revealing what was selected;
      2) secure statistical analysis, the problem of extracting statistics without revealing anything else about the underlying distributed data;
      3) secure sampling, which is the secure distributed generation of new data with a given joint distribution; and
      4) secure authentication, where the identity of a party needs to authenticated via inference on his credentials and stored registration data.

      Our contributions toward these applications include the following. We proposed a novel oblivious transfer protocol, applicable to private information retrieval, that trades off a small amount privacy for a drastic increase in efficiency. We leveraged a dimensionality reduction that exploits functional structure to simultaneously achieve arbitrarily high accuracy and efficiency in protocols that perform secure statistical analysis of distributed databases. Toward characterizing the region of distributions that can be securely sampled from scratch, we fully characterized the two-party scenario and provided inner and outer bounds on the multi-party scenario. Toward enabling secure distributed authentication, we proposed a two-factor secure biometric authentication system that is robust against the compromise of registered biometric data, allowing for revocability and providing resistance against cross-enrollment attacks.
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  •  NEWS   International Conference on Automotive User Interfaces and Interactive Vehicular Applications (AutomotiveUI) 2011: publication by Bret A. Harsham and others
    Date: November 30, 2011
    Where: International Conference on Automotive User Interfaces and Interactive Vehicular Applications (AutomotiveUI)
    MERL Contact: Bret Harsham
    Research Area: Multimedia
    Brief
    • The paper "Evaluating the Usability of a Head-Up Display for Selection from Choice Lists in Cars" by Weinberg, G., Harsham, B. and Medenica, Z. was presented at the International Conference on Automotive User Interfaces and Interactive Vehicular Applications (AutomotiveUI)
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