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Frequency saving OFDMA resource allocation with QoS provision

Frequency saving OFDMA resource allocation with QoS provisio...

引用

6th International ICST Conference on Wireless Internet, WICON 2011

作者： Ru, Guanying Li, Hongxiang Lu, Yanhui Cheng, Yong Lin, Weiyao Electrical and Computer Engineering Department North Dakota State University Fargo ND United States Electrical and Computer Engineering Department University of Louisville Louisville United States Zhengzhou University Zhengzhou China University of California Davis CA United States Communication Systems Group Institute of Telecommunications Darmstadt University of Technology Darmstadt Germany Institute of Image Communication and Information Processing Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9783642304927

With the increasing wireless communication demands, frequency spectrum has become more and more limited and expensive. This paper proposes a novel optimization objective: minimizing the required frequency resource, on the premise that both the power constraints and users' quality of service (QoS) demands can be met. With the frequency saving objective, the primary system can release the unnecessary frequencies for other applications, such as subordinate or cognitive networks. In this paper, we formulate the number of subcarriers minimization problem for both uplink and downlink OFDMA-based networks, which is a mixed NP-hard problem. For the downlink case, we propose an efficient near-optimal algorithm to solve the problem. For the uplink case, we derive low complexity greedy algorithms to obtain tight lower bound and upper bound. Simulation results show that our algorithms can significantly save the system's frequency resource. © 2012 ICST Institute for Computer Science, Social Informatics and telecommunications Engineering.

关键词： Quality of service

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Convex formulation and global optimization for multimodal active contour segmentation

Convex formulation and global optimization for multimodal ac...

引用

International Symposium on image and Signal processing and Analysis

作者： Jonas De Vylder Filip Rooms Wilfried Philips Department of Telecommunications and Information Processing IBBT-Image Processing and Interpretation Ghent University Belgium

Region based active contours have been proven useful in a wide range of applications. This method however hampers from the drawback that in only allows bimodal segmentation, i.e. foreground and background are two regions with approximately uniform intensity. In this paper we propose a new active contour with convex energy which allows multimodal foreground and background.

关键词： image segmentation Active contours Optimization Gaussian distribution Signal processing Microorganisms

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Robust monocular visual odometry by uncertainty voting

Robust monocular visual odometry by uncertainty voting

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IEEE Symposium on Intelligent Vehicle

作者： David Van Hamme Peter Veelaert Wilfried Philips Vision Systems research group University College Ghent Belgium Image Processing and Interpretation (IPI) research group Department of Telecommunications and Information Processing (TELIN) Ghent University Belgium

GPS by itself is not dependable in urban environments, due to signal reception issues such as multi-path effects or occlusion. Other sensor data is required to keep track of the vehicle in absence of a reliable GPS signal. We propose a new method to use a single on-board consumer-grade camera for vehicle motion estimation. The method is based on the tracking of ground plane features, taking into account the uncertainty on their backprojection as well as the uncertainty on the vehicle motion. A Hough-like parameter space vote is employed to extract motion parameters from the uncertainty models. The method is easy to calibrate and designed to be robust to outliers and bad feature quality. Experimental results show good accuracy and high reliability, with a positional estimate within 2 metres for a 400 metre elapsed distance.

关键词： Vehicles Cameras Visualization Uncertainty Feature extraction Trajectory Robustness

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Channelized Hotelling observers for signal detection in stack-mode reading of volumetric images on medical displays with slow response time

Channelized Hotelling observers for signal detection in stac...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Ljiljana Platiša Cédric Marchessoux Tom Kimpe Ewout Vansteenkiste Aldo Badano Wilfried Philips Image Processing and Interpretation Department of Telecommunications and Information Processing (TELIN-IPI-IBBT) Ghent University Ghent Belgium Healthcare Division Technology & Innovation Group Kortrijk Belgium Division of Imaging and Applied Mathematics Office of Science and Engineering Laboratories CDRH-FDA Silver Spring MD USA

Volumetric medical images are commonly read in stack-browsing mode. However, previous studies suggest that slow temporal response of medical liquid crystal displays may degrade the diagnostic accuracy (lesion detectability) at browsing rates as low as 10 frames per second (fps). Recently, a multi-slice channelized Hotelling observer (msCHO) model was proposed to estimate the detection performance in 3D images. This implementation of the msCHO restricted the analysis to the luminance of a display pixel at the end of the frame time (end-of-frame luminance) while ignoring the luminance transition within the frame time (intra-frame luminance). Such an approach fails to differentiate between, for example, the commonly found case of two displays with different temporal profiles of luminance as long as their end-of-frame luminance levels are the same. In order to overcome this limitation of the msCHO, we propose a new upsampled msCHO (umsCHO) which acts on images obtained using both the intra-frame and the end-of-frame luminance information. The two models are compared on a set of synthesized 3D images for a range of browsing rates (16.67, 25 and 50 fps). Our results demonstrate that, depending on the details of the luminance transition profiles, neglecting the intra-frame luminance information may lead to over- or underestimation of lesion detectability. Therefore, we argue that using the umsCHO rather than msCHO model is more appropriate for estimating the detection performance in the stack-browsing mode.

关键词： Biomedical imaging Testing Three dimensional displays Training

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2D mapping of cell nuclei based on contour warping

2D mapping of cell nuclei based on contour warping

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18th European Signal processing Conference, EUSIPCO 2010

作者： De Vylder, Jonas De Vos, Winnok Philips, Wilfried Department of Telecommunications and Information Processing IBBT - Image Processing and Interpretation Group Ghent University St-Pietersnieuwstraat 41 B-9000 Ghent Belgium Department of Molecular Biotechnology Bio-imaging and Cytometry Unit Ghent University Coupure Links 653 B-9000 Ghent Belgium

The dynamics of genome regions are associated to the functional or dysfunctional behaviour of the human cell. In order to study these dynamics it is necessary to remove all perturbations coming from movement and deformation of the nucleus, i.e. the container holding the genome. In literature models have been proposed to cope with the transformations corresponding to nuclear dynamics of healthy cells. However for pathological cells, the nucleus deforms in an apparently random way, making the use of such models a non trivial task. In this paper we propose a mapping of the cell nucleus which is based on the matching of the nuclear contours. The proposed method does not put constraints on the possible shapes nor on the possible deformations, making this method suited for the analysis of pathological nuclei. © EURASIP, 2010.

关键词： Dynamics

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2D MAPPING OF CELL NUCLEI BASED ON CONTOUR WARPING

2D MAPPING OF CELL NUCLEI BASED ON CONTOUR WARPING

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European Signal processing Conference

作者： Jonas De Vylder Winnok De Vos Wilfried Philips Department of Telecommunications and Information Processing IBBT - Image Processing and Interpretation Group Ghent University Department of Molecular Biotechnology Bio-imaging and Cytometry Unit Ghent University

关键词： Nucleus Human cells Cell nucleus mapping Warping Comet Nucleus Tour dynamics nuclei (nuclear physics) Genome CONTAINERS perturbation MAPPING(MATHEMATICAL)

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2D mapping of strongly deformed cell nuclei based on contour warping

2D mapping of strongly deformed cell nuclei based on contour...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Jonas De Vylder Koen Douterloigne Winnok De Vos Wilfried Philips Department of Telecommunications and Information Processing IBBT Image Processing and Interpretation Group Ghent University Belgium Bio imaging and Cytometry Unit Department of Molecular Biotechnology Ghent University Belgium

The dynamics of genome regions are associated to the functional or dysfunctional behaviour of the human cell. In order to study these dynamics it is necessary to remove perturbations coming from movement and deformation of the nucleus, i.e. the container holding the genome. In literature models have been proposed to cope with the transformations corresponding to nuclear dynamics of healthy cells. However for pathological cells, the nucleus deforms in an apparently random way, making the use of such models a non trivial task. In this paper we propose a mapping of the cell nucleus which is based on the matching of the nuclear contours. The proposed method does not put constraints on the possible shapes nor on the possible deformations, making this method suited for the analysis of pathological nuclei.

关键词： Spline Shape Pathology Euclidean distance Three dimensional displays Pixel Microscopy

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Tracking multiple objects using intensity-GVF snakes

Tracking multiple objects using intensity-GVF snakes

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17th European Signal processing Conference, EUSIPCO 2009

作者： De Vylder, Jonas Ochoa, Daniel Philips, Wilfried Chaerle, Laury Van Der Straeten, Dominique Department of Telecommunications and Information Processing IBBT - Image Processing and Interpretation Group Ghent University St-Pietersnieuwstraat 41 B-9000 Ghent Belgium Campus Gustavo Galindo via Perimetral Apartado 09-01-5863 Guayaquil Ecuador Department of Physiology Unit Plant Hormone Signalling and Bio-Imaging Ghent University Ledeganckstraat 35 B-9000 Ghent Belgium

Active contours or snakes are widely used for segmentation and tracking. Multiple object tracking remains a difficult task, characterised by a trade off between increasing the capturing range of edges of the object of interest, and decreasing the capturing range of other edges. We propose a new external force field which is calculated for every object independently. This new force field uses prior knowledge about the intensity of the object of interest. Using this extra information, this new force field helps in discriminating between edges of interest and other objects. For this new force field, the expected intensity of an object must be estimated. We propose a technique which calculates this estimation out of the image. © EURASIP, 2009.

关键词： Economic and social effects

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TRACKING MULTIPLE OBJECTS USING INTENSITY-GVF SNAKES

TRACKING MULTIPLE OBJECTS USING INTENSITY-GVF SNAKES

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European signal processing conference

作者： Jonas De Vylder Daniel Ochoa Wilfried Philips Laury Chaerle Dominique Van Der Straeten Department of Telecommunications and Information Processing IBBT - Image Processing and Interpretation Group Ghent University St-Pietersnieuwstraat 41 B-9000 Ghent Belgium Department of Telecommunications and Information Processing IBBT - Image Processing and Interpretation Group Ghent University St-Pietersnieuwstraat 41 B-9000 Ghent BelgiumFacultad de Ingeniera en Electricidad y Computacin Escuela Superior Politcnic Department of Physiology Unit Plant Hormone Signalling and Bio-imaging Ghent University Ledeganckstraat 35 B-9000 Ghent Belgium

ISBN: (纸本)9781617388767

关键词： Snakes field theory (physics) interest Active contours tracking Force Ophidia Fields

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Tracking multiple objects using moving snakes

Tracking multiple objects using moving snakes

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International Conference on Digital Signal processing (DSP)

作者： Jonas De Vylder Daniel Ochoa Wilfried Philips Laury Chaerle Dominique Van Der Straeten Department of Telecommunications and Information Processing IBBT-Image Processing and Interpretation Group Ghent University Ghent Belgium Facultad de Ingeniera en Electricidad y Computacin Escuela Superior Politcnica del Litoral (ESPOL) Guayaquil Ecuador Department of Physiology Unit Plant Hormone Signalling and Bio-imaging Ghent University Ghent Belgium

Active contours or snakes are widely used for segmentation and tracking. The ability of a snake to track an object depends on the movement of the object. If the object moves too far from one frame to another, the snake risks losing the true contour location. The subsequent evolution steps are negatively affected, reporting a false contour that can propagate to other frames. To overcome this problem a new snake algorithm has been developed. This new technique, moving snakes, works in two steps. During the first step, the snake is translated as a rigid body towards the contour. This translation is calculated using the external force field of the image, therefore it does not require prior knowledge about the object movement. In the second step the actual shape evolution of the snake takes place.

关键词： Active contours image segmentation Convergence information processing image processing Telecommunication computing Physiology Biochemistry Tracking Shape

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