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the selection and use of Compact Fluorescent lamps and light emitting diodes in downlighters

The selection and use of Compact Fluorescent lamps and light...

引用

Domestic Use of Energy conference (DUE)

作者： Robert Henderson Chief Engineer Research Testing and Development Eskom South Africa

this paper reviews some of the factors that the user should consider when selecting an energy efficient lamp to replace their existing Quartz Halogen downlighter lamps. they should be prepared to accept lower light levels and a colour shift resulting in a change in the room appearance. the degree of this change can be minimised with the correct selection of replacement lamp.

关键词： Government World Wide Web Rendering (computer graphics) Color Light emitting diodes

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RICCI CURVATURE AND FLOW FOR IMAGE DENOISING AND SUPER-RESOLUTION

RICCI CURVATURE AND FLOW FOR IMAGE DENOISING AND SUPER-RESOL...

引用

European Signal Processing conference

作者： Eli Appleboim Emil Saucan Yehoshua Y. Zeevi EE. Math. EE. Department Technion - Israel Institute of Technology

ISBN: (纸本)9781467310680

A discrete version of the Ricci flow, applicable to images, is introduced and applied in image denoising and in single-image-based enhancement and super-resolution. this flow is unique among the geometric flows that have been applied in image processing, in that it is the only flow wherein the metric of an image evolves rather than the image itself as is the case in other geometric flows applicable in image processing. the flow is based on the combinatorial Ricci curvature defined by Forman, that was previously introduced by the authors in the context of image processing. It is shown that the Ricci flow preserves image structure much better than the Beltrami flow and other state-of-the-art image enhancement schemes. Implementation of the Ricci flow is applicable also to general surfaces such as required in computer graphics and other applications.

关键词： images image denoising Beltrami flow Imagery (Psychotherapy) Image processing super-resolution Curvature Flow computer graphics Image

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Low-delay hearing aid based on cochlear model with nonuniform subband acoustic feedback cancellation

Low-delay hearing aid based on cochlear model with nonunifor...

引用

European Signal Processing conference (EUSIPCO)

作者： Maxim Vashkevich Elias Azarov Alexander Petrovsky Department of Computer Engineering Belarusian State University of Informatics and Radioelectronics슠 Minsk Belarus Department of Digital Media and Computer Graphics Bialystok University of Technology Bialystok Poland

ISBN: (纸本)9781467310680

the paper presents a hearing aid (HA) system based on a low-delay cochlear filter bank derived from the discrete cochlear model. the spectral gain shaping method (SGSM) that includes dynamic range compression, hearing loss compensation and noise reduction is applied in perceptually matched frequency bands. the acoustic feedback cancellation is implemented as an off-the-forward path scheme and does not introduce an additional delay to the forward path. the cancellation itself is made by adaptive filtering of non-uniform subband signals obtained from an oversampled warped cosine-modulated filter bank.

关键词： Auditory system Delay Frequency control Noise reduction Gain Speech

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Detecting movement patterns using Brownian bridges 12

Detecting movement patterns using Brownian bridges

引用

20th ACM SIGSPATIAL International conference on Advances in Geographic Information Systems, ACM SIGSPATIAL GIS 2012

作者： Buchin, Kevin Arseneau, T. Jean Marie Sijben, Stef Willems, Erik P. Dep. of Mathematics and Computer Science TU Eindhoven Netherlands Anthropological Institute and Museum University of Zurich Switzerland

ISBN: (纸本)9781450316910

In trajectory data a low sampling rate leads to high uncertainty in between sampling points, which needs to be taken into account in the analysis of such data. However, current algorithms for movement analysis ignore this uncertainty and assume linear movement between sample points. In this paper we develop a framework for movement analysis using the Brownian bridge movement model (BBMM), that is, a model that assumes random movement between sample points. Many movement patterns are composed from basic building blocks, like distance, speed or direction. We efficiently compute their distribution over space and time in the BBMM using parallel graphics hardware. We demonstrate our framework by computing patterns like encounter, avoidance/attraction, regular visits, and following. Our motivation to study the BBMM stems from the rapidly expanding research paradigm of movement ecology. To this end, we provide an interface to our framework in R, an environment widely used within the natural sciences for statistical computing and modeling, and present a study on the simultaneous movement of groups of wild and free-ranging primates. © 2012 ACM.

关键词： Mammals

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A room-compensated virtual surround system exploiting early reflections in a reverberant room

A room-compensated virtual surround system exploiting early ...

引用

European Signal Processing conference (EUSIPCO)

作者： A. Canclini D. Marković F. Antonacci A. Sarti S. Tubaro Dipartimento di Elettronica ed Informazione Politecnico di Milano Milano Italy

In this paper we propose a novel methodology for rendering a surround sound in a prescribed area using a loudspeaker array, which exploits the early reflections on the walls of the room. With respect to the state of the art, the proposed technique is able to take advantage of the knowledge of the acoustic scene (i.e. room geometry and reflective properties of the walls) in order to reduce undesired wall reflections. Simulative results show that the use of room compensation enables an improved accuracy of the virtual surround.

关键词： Acoustic beams Acoustics Geometry Loudspeakers Least squares approximation Signal processing Rendering (computer graphics)

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Instantaneous pitch estimation based on RAPT framework

Instantaneous pitch estimation based on RAPT framework

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European Signal Processing conference (EUSIPCO)

作者： Elias Azarov Maxim Vashkevich Alexander Petrovsky Computer engineering Department Belarusian State University of Informatics and Radioelectronics슠 Minsk Belarus Department of Digital Media and Computer Graphics Bialystok University of Technology Bialystok Poland

ISBN: (纸本)9781467310680

the paper presents a pitch estimation technique based on the robust algorithm for pitch tracking (RAPT) framework. the proposed solution provides estimation of instantaneous pitch values and is not sensitive to rapid frequency modulations. the technique utilizes a different period candidate generating function based on instantaneous harmonic parameters. the function is similar to normalized cross-correlation function, however it represents momentary periodicity with high frequency resolution. the second major revision of RAPT is an additional post-processing procedure that makes estimation values more accurate. the proposed algorithm is compared with other pitch detection algorithms using artificial and natural signals.

关键词： Estimation Harmonic analysis Speech Power harmonic filters Frequency modulation Frequency estimation Signal processing algorithms

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MINIMAL DISTORTION 3-D WATERMARKING USING STATISTICS OF GEODESIC DISTANCES

MINIMAL DISTORTION 3-D WATERMARKING USING STATISTICS OF GEOD...

引用

European Signal Processing conference

作者： Ming Luo Adrian G. Bors Dept. of Computer Science University of York

ISBN: (纸本)9781467310680

this paper describes a statistical 3-D digital watermarking method using distributions of distances measured along mesh surfaces. the proposed method employs a mesh propagation procedure called the Fast Marching Method (FMM), which defines regions of equal geodesic distance width calculated with respect to a reference location on the mesh surface. the embedding is performed by statistically changing the normalized distribution of local geodesic distances. Vertices are moved onto the plane of triangles containing the current geodesic front line as generated by the FMM. Such vertex perturbations ensure that the resulting distortions in the 3-D graphics is minimal.

关键词： 3-D watermarking Surface preservation Fast Marching Method Geodesic distances reference locations Geodesic Triangle distortion Mesh Medical Subject Headings three-Dimensional Images vertex head plane Platanus hybrida Minimal Mesh

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INCORPORATING AUDITORY PROPERTIES INTO GENERALISED SIDELOBE CANCELLER

INCORPORATING AUDITORY PROPERTIES INTO GENERALISED SIDELOBE ...

引用

European Signal Processing conference

作者： Adam Borowicz Alexandr Petrovsky Bialystok University of Technology Department of Digital Media and Computer Graphics

ISBN: (纸本)9781467310680

A novel speech enhancement method based on generalized sidelobe canceller (GSC) and auditory properties is presented. We show that it is possible to reduce audible speech distortions and preserve residual noise level under system model uncertainties. It can be done by constraining a speech leakage power according to masking effect phenomena. An optimal noise cancellation filter is derived using constrained minimization of the residual noise power. We implemented the GSC structure using a simple delay-and-sum beamformer and corresponding (delays-dependent) blocking matrix. Finally a comparative evaluation of the selected methods is performed using objective speech quality measures. the results show that the novel method outperforms conventional one providing lower speech distortions and comparable noise attenuation.

关键词： GSC Speech enhancement Beamforming residual noise generalized sidelobe canceller noise attenuation Speech Noise cancellation GSC gene Speech enhancement

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An alternative memory access scheduling in manycore accelerators

An alternative memory access scheduling in manycore accelera...

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20th International conference on Parallel Architectures and Compilation Techniques, PACT 2011

作者： Kim, Yonggon Lee, Hyunseok Kim, John Department of Computer Science KAIST Korea Republic of

ISBN: (纸本)9780769545660

Memory controllers in graphics processing units (GPU) often employ out-of-order scheduling to maximize row access locality. However, this requires complex logic to enable out-of-order scheduling compared with in-order scheduling. To provide a low-cost and low-complexity memory scheduling, we propose an alternative memory scheduling where the memory scheduling is performed not at the destination (i.e., memory controller) but is done at the source (i.e., the cores). We propose two complementary techniques in source-based memory scheduling - network congestion-aware source throttling and superpackets, where multiple request packets are grouped together to create a single superpacket. By combing these techniques, the performance across a wide range of application is within 95% of the complex FR-FCFS on average and at significantly lower cost and complexity. © 2011 IEEE.

关键词： graphics processing unit

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Efficient retrieval of 3D building models using embeddings of attributed subgraphs 11

Efficient retrieval of 3D building models using embeddings o...

引用

20th ACM conference on Information and Knowledge Management, CIKM'11

作者： Wessel, Raoul Ochmann, Sebastian Vock, Richard Blümel, Ina Klein, Reinhard Computer Graphics Group University of Bonn Germany TIB Hannover Germany

ISBN: (纸本)9781450307178

We present a novel method for retrieval and classification of 3D building models that is tailored to the specific requirements of architects. In contrast to common approaches our algorithm relies on the interior spatial arrangement of rooms instead of exterior geometric shape. We first represent the internal topological building structure by a Room Connectivity Graph (RCG). To enable fast and efficient retrieval and classification with RCGs, we transform the structured graph representation into a vector-based one by introducing a new concept of subgraph embeddings. We provide comprehensive experiments showing that the introduced subgraph embeddings yield superior performance compared to state-of-the-art graph retrieval approaches. © 2011 ACM.

关键词： Topology

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