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LOCAL BINARY PATTERNS FOR 1-D signal processing

LOCAL BINARY PATTERNS FOR 1-D SIGNAL PROCESSING

引用

European signal processing Conference

作者： Navin Chatlani John J. Soraghan Centre for Excellence in Signal and Image Processing (CeSIP) University of Strathclyde

Local Binary Patterns (LBP) have been used in 2-D image processing for applications such as texture segmentation and feature detection. In this paper a new 1-dimensional local binary pattern (LBP) signal processing method is presented. Speech systems such as hearing aids require fast and computationally inexpensive signal processing. The practical use of LBP based speech processing is demonstrated on two signal processing problems: - (i) signal segmentation and (ii) voice activity detection (VAD). Both applications use the underlying features extracted from the 1-D LBP. The proposed VAD algorithm demonstrates the simplicity of 1-D LBP processing with low computational complexity. It is also shown that distinct LBP features are obtained to identify the voiced and the unvoiced components of speech signals.

关键词： Decision support systems Europe signal processing

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Fractional RDA and enhanced FrCSA for SAR imaging

Fractional RDA and enhanced FrCSA for SAR imaging

引用

Sensor signal processing for Defence (SSPD 2010)

作者： Carmine Clemente John J. Soraghan Centre for Excellence in Signal and Image Processing University of Strathclyde Glasgow UK

Synthetic Aperture Radar systems are used to form high resolution images from radar backscattered signals. The Fractional Fourier transform (FrFT), which is a generalized form of the well-known Fourier transform, has opened up the possibility of a new range of potentially promising and useful applications that involve the use and detection of chirp signals including pattern recognition and SAR imaging. In this paper the FrFT is applied to the well established Range Doppler Algorithm and to the Chirp Scaling Algorithm to form the FrRDA and eFrCSA (enhanced Fractional CSA). The performance of the algorithms are assessed using simulated and real Radarsat-1 data sets. The results confirm that the FrFT based SAR processing methods provide enhanced resolution yielding superior focusing accuracy and target detection.

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Fractional Range Doppler Algorithm for SAR imaging

Fractional Range Doppler Algorithm for SAR imaging

引用

European Radar Conference (EURAD)

作者： Carmine Clemente John J. Soraghan Centre of Excellence for Image and Signal Processing University of Strathclyde Glasgow UK

Synthetic Aperture Radar systems are normally used to form high resolution images from radar backscatter. The Fractional Fourier transform (FrFT), which is a generalized form of the well-known Fourier transform, has opened up the possibility of a new range of potentially promising and useful applications that involve the use and detection of chirp signals including pattern recognition and SAR. In this paper the FrFT is applied to the well established Range Doppler Algorithm in order to obtain a superior result in terms of resolution and noise rejection. The results confirm that the FrFT can be useful to perform high resolution SAR processing and to reduce the speckle noise while enhancing the resolution and focusing accuracy.

关键词： Fourier transforms Azimuth Chirp Noise Logic gates signal processing algorithms Time frequency analysis

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Performance evaluation of image fusion by using copulas

Performance evaluation of image fusion by using copulas

引用

International Conference on signal processing Proceedings (ICSP)

作者： Xuexing Zeng Tariq S Durrani Centre of Excellence in Signal and Image Processing University of Strathclyde Glasgow UK

With the ready availability of multiple sensors, the area of information fusion has been receiving increasing attention. For multi-sensor image data, algorithms such as simple average method, Principal Component Analysis (PCA) method, Gradient Pyramid (GP) method, Laplacian Pyramid (LP), Ratio Pyramid (RP) method and Discrete Wavelet Transform (DWT) methods have been successfully applied for image fusion. Another important issue that arises in image fusion: the performance of image fusion is that the performance of the associated algorithms is difficult to evaluate, especially when a clearly defined ground-truth image is not available. Some common measures to assess the performance for image fusion are Mutual information (MI), Tsallis and Renyi divergence based information. However they are difficult to estimate precisely. In this paper, a new approach is proposed for evaluating the performance of image fusion algorithms based on copula functions. To achieve this, copulas are proposed for the estimation of the MI, Tsallis and Renyi divergence based information and these are used to evaluate the quality of image fusion.

关键词： image fusion Mutual information Principal component analysis Discrete wavelet transforms Joints Probability density function Pixel

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Range Doppler SAR processing using the Fractional Fourier Transform

Range Doppler SAR processing using the Fractional Fourier Tr...

引用

International Radar Symposium (IRS)

作者： Carmine Clemente John J. Soraghan Centre of Excellence for Image and Signal Processing University of Strathclyde Glasgow UK

ISBN: (纸本)9781424456130;9789955690184

The Fractional Fourier transform (FrFT), which is a generalized form of the well-known Fourier transform, has opened up the possibility of a new range of potentially promising and useful applications including radar involving the use and detection of chirp signals, pattern recognition and Synthetic Aperture Radar (SAR) image processing. In this paper the Fractional Fourier transform is applied to the Range Doppler Algorithm in order to obtain a better result in terms of resolution. The proposed technique takes advantage from the property of the FrFT to resolve with high precision chirp signals. Preliminary results are encouraging and confirms that the FrFT can be useful to perform high resolution SAR processing.

关键词： Fourier transforms Azimuth Chirp signal resolution Time frequency analysis signal processing algorithms Synthetic aperture radar

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Extended orthogonal space-time block coded transmission with quantised differential feedback

Extended orthogonal space-time block coded transmission with...

引用

International Symposium on Wireless Communication Systems (ISWCS)

作者： Mohamed Nuri Hussin Stephan Weiss Centre of Excellence in Signal & Image Processing Department of EEE University of Strathclyde Glasgow UK

Extended orthogonal space-time coding can use feedback of channel state information to increase the diversity gain of the transmission. This paper calculates the maximum attainable gain, and shows the effect that quantisation in the feedback channel has on the system performance. We demonstrate that for slow-fading channels, differential coding with a single feedback bit can achieve near-optimum performance and exceed the performance of non-differential feedback with higher word length. We also comment on combining differential encoding with channel estimation. Simulation results compare this approach to state-of-the-art systems with standard quantised and unquantised feedback.

关键词： Arrays Doppler effect Quantization Diversity methods Bit error rate Channel estimation

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TRANSCEIVER DESIGN FOR NON-REGENERATIVE MIMO RELAY SYSTEMS WITH DECISION FEEDBACK DETECTION

TRANSCEIVER DESIGN FOR NON-REGENERATIVE MIMO RELAY SYSTEMS W...

引用

European signal processing Conference

作者： Andrew P. Millar Stephan Weiss Centre for Excellence in Signal & Image Processing Department of Electronic & Electrical Engineering University of Strathclyde

In this paper we consider the design of zero forcing (ZF) and minimum mean square error (MMSE) transceivers for non-regenerative multiple input multiple output (MIMO) relay networks. Our designs utilise linear processors at each stage of the network along with a decision feedback detection device at the receiver. Under the assumption of full channel state information (CSI) across the entire link the processors are jointly optimised to minimise the system arithmetic mean square error (MSE) whilst meeting average power constraints at both the source and the relay terminals. We compare the presented methods to linear designs available in the literature and show the advantages of the proposed transceivers through simulation results.

关键词： Relays Transceivers MIMO Optimization Matrix decomposition Program processors Antennas

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INCREMENTAL RATE MAXIMISATION POWER LOADING WITH BER IMPROVEMENTS

INCREMENTAL RATE MAXIMISATION POWER LOADING WITH BER IMPROVE...

引用

European signal processing Conference

作者： Waleed Al-Hanafy Mohamed Nuri Hussin Stephan Weiss Centre for Excellence in Signal and Image Processing Dept. of EEE Univ. of Strathclyde

This paper aims to maximise the rate over a MIMO link using incremental power and bit allocation. Two different schemes, greedy power allocation (GPA) and greedy bit allocation (GBA), are addressed and compared with the standard uniform power allocation (UPA). The design is constrained by the target BER, the total power budget, and fixed discrete modulation orders. We demonstrate through simulations that GPA outperforms GBA in terms of throughput and power conservation, while GBA is advantageous when a lower BER is beneficial. Once the design constraints are satisfied, remaining power is utilised in two possible ways, leading to improved performance of GPA and UPA algorithms. This redistribution is analysed for fairness in BER performance across all active subchannels using a bisection method.

关键词： Bit error rate Quadrature amplitude modulation Loading Resource management Throughput signal to noise ratio Lead

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Virtual reality training environment a proposed architecture

Virtual reality training environment a proposed architecture

引用

2010 8th IEEE International Conference on Virtual Environments, Human-Computer Interfaces, and Measurement Systems, VECIMS 2010

作者： Da Silva Netto, Ademar Virgolino De Fatima Queiroz Vieira, Maria LIHM Electric Engineering Department Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Centre for Excellence in Signal and Image Processing Dept of Electronic and Electrical Engineering University of Strathclyde United Kingdom

ISBN: (纸本)9781424459063

Operator training systems are essential tools for industrial systems, particularly for those where human error impacts on the safety of materials and personnel may cause significant financial losses. This work is part of a research project concerned with the study of operator behaviour when facing safety-critical situations. This paper focuses on the simulator architecture of an operator training system that is based on formal models, interconnected to form its simulation engine. It also discusses how the simulator engine communicates with the virtual world representation. The models were built using the Coloured Petri Nets (CPN) formalism. The simulator requirements include: a multi-platform collaborative and multi-user environment that allow for remote access;built with freeware software tools. The simulator built according to the architecture described on this paper, has been validated by a team of operators from the industrial context of application, i.e. electric systems. © 2010 IEEE.

关键词： Virtual reality

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SPATIAL NOISE REDUCTION IN BINAURAL HEARING AIDS 18th

SPATIAL NOISE REDUCTION IN BINAURAL HEARING AIDS

引用

European signal processing Conference

作者： Navin Chatlani Eghart Fischer John J. Soraghan Centre for Excellence in Signal and Image Processing University of Strathclyde Royal College Building Siemens Audiological Engineering Group

Binaural hearing aids are configured to have a wireless transmission link between the left and the right hearing aid. State-of-the-art hearing aids use two microphones in each instrument for compactness and power consumption constraints. In environments with multiple interferers, directional signal processing in hearing aids use techniques such as differential microphone arrays to improve speech intelligibility. However, these hearing aids have maximum sensitivity to target sources located directly in front or directly behind the user. In this paper, a novel binaural system is presented for steering the look direction of the hearing aid to other angles than 0/180 degrees. The new system was tested in a real-time environment to confirm the results.

关键词： Microphone Device Component peak response binaural hearing signal processing Steering compactness Speech Intelligibility transmission link microphone arrays Hearing Aids Environments

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