• Advances in games technology : software, models, and intelligence

      Prakash, Edmond C.; Brindle, G.; Jones, K.; Zhou, S.; Chaudhari, Narendra S.; Wong, K.-W. (Sage Publications, 2009-12)
    • AimaSimul: a software tool to plan stent positioning in peripheral arteries and evaluate the associated fatigue fracture risk

      Testi, Debora; McFarlane, Nigel J.B.; Wei, Hui; Zhao, Youbing; Clapworthy, Gordon J.; Ryan, D. M.; Lawford, Patricia; University of Bedfordshire; CINECA Supercomput. Centre (IEEE, 2013-11)
      Vascular stent deployment in peripheral arteries is a medical intervention in which a wire mesh tube is inserted into the artery to provide internal support. However, stents positioned in locations such as the femoral artery are subject to cyclic bending, and are therefore at risk of fatigue fracture. A software tool chain, called AimaSimul, is being implemented to support stent modeling, surgical simulation and risk calculation for surgical planning. In particular, the AimaSimul preoperative planning tool allows clinicians, starting from patient-specific medical images, to interactively assess different stent models and deployment options for the risk of breakage. This paper describes the main functionalities of AimaSimul and, in particular, the stent deployment and deformation.
    • An algorithm for accurate taillight detection at night

      Boonsim, Noppakun; Prakoonwit, Simant; University of Bedfordshire (Foundation of Computer Science, 2014-08)
      Vehicle detection is an important process of many advance driver assistance system (ADAS) such as forward collision avoidance, Time to collision (TTC) and Intelligence headlight control (IHC). This paper presents a new algorithm to detect a vehicle ahead by using taillight pair. First, the proposed method extracts taillight candidate regions by filtering taillight colour regions and applying morphological operations. Second, pairing each candidates and pair symmetry analysis steps are implemented in order to have taillight positions. The aim of this work is to improve the accuracy of taillight detection at night with many bright spot candidates from streetlamps and other factors from complex scenes. Experiments on still images dataset show that the proposed algorithm can improve the taillight detection accuracy rate and robust under limited light images.
    • Analyzing image deblurring through three paradigms

      Wang, Chao; Sun, Lifeng; Cui, Peng; Zhang, Jianwei; Yang, Shiqiang (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2012)
    • Aneurysm identification by analysis of the blood-vessel skeleton

      Kohout, Josef; Chiarini, Alessandro; Clapworthy, Gordon J.; Klajnšek, Gregor (Elsevier, 2013)
    • Applying Cross-cultural theory to understand users’ preferences on interactive information retrieval platform design

      Chessum, Karen; Liu, Haiming; Frommholz, Ingo; University of Bedfordshire (University of Nottingham, School of Computer Science., 2014-09)
      In this paper we look at using culture to group users and model the users’ preference on cross cultural information retrieval, in order to investigate the relationship between the user search preferences and the user’s cultural background. Initially we review and discuss briefly website localisation. We continue by examining culture and Hofstede’s cultural dimensions. We identified a link between Hofstede’s five dimensions and user experience. We did an analogy for each of the five dimensions and developed six hypotheses from the analogies. These hypotheses were then tested by means of a user study. Whilst the key findings from the study suggest cross cultural theory can be used to model user’s preferences for information retrieval, further work still needs to be done on how cultural dimensions can be applied to inform the search interface design.
    • Automatic X-ray screening of aircraft hold luggage

      Benjamin, Ralph; Prakoonwit, Simant (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997)
      The authors addressed the application of the “object 3D” X ray reconstruction technique for electronically “unpacking” suspect items, when screening aircraft luggage. However, there is no satisfactory solution to the mass screening of hold luggage. Computed Tomography, CT, entails excessive radiation dosages, and its rate of throughput is quite inadequate. A novel variant of “object 3D” is therefore put forward, adapting some of the technology of existing cabin luggage screening systems-but on a substantially larger scale-which does achieve the required throughput at an acceptable radiation dosage and cost.
    • Baseline of virtual cameras acquired by a standard plenoptic camera setup

      Hahne, Christopher; Aggoun, Amar; Haxha, Shyqyri; Velisavljević, Vladan; Fernandez, Juan C. J.; University of Bedfordshire (IEEE, 2014-07-03)
      Plenoptic cameras have been used to computationally generate viewpoint images from the captured light field. This paper aims to provide a prediction of corresponding virtual camera positions based on the parameters of a standard plenoptic camera setup. Furthermore, by tracing light rays from the sensor to the object space, a solution is proposed to estimate the baseline of viewpoints. By considering geometrical optics, the suggested approach has been implemented in Matlab and assessed using Zemax, a real ray tracing simulation tool. Thereby, the impact of different main lens locations is investigated. Results of the baseline approximation indicate that estimates obtained by the proposed model deviate by less than 0.2% compared to the complex real ray tracing method.
    • Building highly realistic facial modeling and animation: a survey

      Ersotelos, Nikolaos; Dong, Feng (SpringerLink, 2008)
      This paper provides a comprehensive survey on the techniques for human facial modeling and animation. The survey is carried out from two different perspectives: facial modeling, which concerns how to produce 3D face models, and facial animation, which regards how to synthesize dynamic facial expressions. To generate an individual face model, we can either perform individualization of a generic model or combine face models from an existing face collection. With respect to facial animation, we have further categorized the techniques into simulation-based, performance-driven and shape blend-based approaches. The strength and weakness of these techniques within each category are discussed, alongside with the applications of these techniques to various exploitations. In addition, a brief historical review of the technique evolution is provided. Limitations and future trend are discussed. Conclusions are drawn at the end of the paper.
    • CCVis: a software plugin for unified visualisation in ContraCancrum based on VTK extensions

      Zhao, Youbing; Clapworthy, Gordon J.; Tao, Yubo; Dong, Feng; Wei, Hui; Wang, Tao (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2011-07)
    • Clinically driven design of multi-scale cancer models: the ContraCancrum project paradigm

      Marias, Kostas; Dionysiou, D.; Sakkalis, Vangelis; Graf, N.; Bohle, R.M.; Coveney, Peter V.; Wan, S.; Folarin, A.; Buchler, P.; Reyes, M.; et al. (The Royal Society, 2011-06-06)
    • Contour synthesis by least-squares construction

      Dong, Feng; Clapworthy, Gordon J.; Lin, Hai (IET, 2009-10-08)
    • A cross-platform approach to the treatment of ambylopia

      Wei, Hui; Zhao, Youbing; Dong, Feng; Saleh, George; Ye, Xujiong; Clapworthy, Gordon J.; University of Bedfordshire (IEEE, 2013-11)
      In this paper, we introduce a diagnosis and treatment for amblyopia performed through a game suitable for children aged between 3 and 7. Our method places emphasis on cooperation between the two eyes to achieve a good binocular outcome to aid the recovery of depth perception. Our approach is not limited to a particular device or platform nor even to a particular form of game. Several prototype games have been developed, including 2D games and 3D games.
    • Deposition of charged inhaled aerosols with transient airflow in sequential lung airway model

      Koolpiruck, Diew; Prakoonwit, Simant; Balachandran, Wamadeva (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2004)
    • The development of a parallel ray launching algorithm for wireless network planning

      Lai, Zhihua; Bessis, Nik; De La Roche, Guillaume; Kuonen, Pierre; Zhang, Jie; Clapworthy, Gordon J. (IGI Publishing, 2011)
    • Diode-based IQ imbalance estimation in direct conversion transmitters

      Xiong, Jian; Zhang, Yue; Li, Wei; Wang, Jin; Huang, Li-Ke; Maple, Carsten; University of Bedfordshire; Aeroflex, Stevenage; Shanghai Jiao Tong University (IEEE, 2014-02)
      Direct conversion transmitters are widely used in wireless systems for their inherent features of being simple and low cost. In this architecture, the inphase (I branch) and quadrature signal (Q branch) will be unconverted to the RF frequency band by quadrature modulation. However, the drawback of the direct conversion architecture is that it is sensitive to IQ imbalance caused by the impairment of analogue devices in I and Q branches. It then results in interferences in mirror frequencies which degrades the signal quality. Therefore, the accurate measurement of IQ imbalance is crucial. A diode-based method to measure the broadband IQ imbalance is proposed which does not need additional measurement instruments. Measurement results show the effectiveness of this method
    • Distributed pixel mapping for refining dark area in parallax barriers based holoscopic 3D Display

      Swash, M.R.; Aggoun, Amar; Fatah, O. Abdul; Fernandez, Juan C. J.; Alazawi, E.; Tsekleves, Emmanuel; Brunel University; University of Bedfordshire (IEEE, 2013-12)
      Autostereoscopic 3D Display is robustly developed and available in the market for both home and professional users. However 3D resolution with acceptable 3D image quality remains a great challenge. This paper proposes a novel pixel mapping method for refining dark areas between two pinholes by distributing it into 3 times smaller dark areas and creating micro-pinholes in parallax barriers based holoscopic 3D displays. The proposed method allows to project RED, GREEN, BLUE subpixels separately from 3 different pinholes and it distributes the dark spaces into 3 times smaller dark spaces, which become unnoticeable and improves quality of the constructed holoscopic 3D scene significantly. Parallax barrier technology refers to a pinhole sheet or device placed in front or back of a liquid crystal display, allowing to project viewpoint pixels into space that reconstructs a holoscopic 3D scene in space. The holoscopic technology mimics the imaging system of insects, such as the fly, utilizing a single camera, equipped with a large number of micro-lenses or pinholes, to capture a scene, offering rich parallax information and enhanced 3D feeling without the need of wearing specific eyewear.
    • Dynamic hyperlinker for 3D content search and retrieval

      Swash, M.R.; Aggoun, Amar; Fatah, O. Abdul; Li, B.; Fernandez, Juan C. J.; Tsekleves, Emmanuel; Brunel University; University of Bedfordshire (IEEE, 2013-06)
      Recently, 3D display technology, and content preparation and creation tools have been under vigorous development. Consequently, they are also widely adopted by home and professional users. 3D digital repositories are increasing and becoming available ubiquitously. However, there is not yet a single 3D content search and retrieval platform. In this paper, we propose and present the development of a novel approach for 3D content search and retrieval which is called Dynamic hyperlinker for 3D content search and retrieval. It advances 3D multimedia navigability and searchability by creating dynamic links for selectable and clickable objects in the scene while the 3D video clip is being replayed. The proposed system involves 3D video processing, such as detecting/tracking clickable objects, annotating objects, and metadata engineering. Such system attracts the attention from both home and professional users such as broadcasters and digital content providers. The experiment is conducted on Holoscopic 3D images “also known as integral images.
    • Dynamic PCI assignment in two-tier networks based on cell activity prediction

      Zhang, J.; Zhang, X.; Xiao, Z.; Liu, Enjie; University of Bedfordshire; Hunan University; University of Sheffield (IET, 2013-11)
      Physical cell identity (PCI) is used to identify each cell. However, with the introduction of femtocells, 8 bytes allocation for PCI cannot accommodate a large number of femtocells. The current solution in 3GPP Release 9 is to use cell global identity associated with PCI to resolve this problem. However, this solution may incur higher inbound handover failure. A dynamic PCI assignment based on cell activity level prediction is proposed. The system level simulation showed that the approach outperforms the existing approaches.
    • Dynamic user equipment-based hysteresis-adjusting algorithm in LTE femtocell networks

      Xiao, Zhu; Zhang, Xu; Maple, Carsten; Allen, Ben; Liu, Enjie; Mahato, Shyam Babu; University of Bedfordshire; Southeast University, Nanjing; Hunan University, Chang sha; University of Warwick (IEEE, 2014-09)
      In long-term evolution (LTE) femtocell networks, hysteresis is one of the main parameters which affects the performance of handover with a number of unnecessary handovers, including ping-pong, early, late and incorrect handovers. In this study, the authors propose a hybrid algorithm that aims to obtain the optimised unique hysteresis for an individual mobile user moving at various speeds during the inbound handover process. This algorithm is proposed for two-tier scenarios with macro and femto. The centralised function in this study evaluates the overall handover performance indicator. Then, the handover aggregate performance indicator (HAPI) is used to determine an optimal configuration. Based on the received reference signal-to-interference-plus-noise ratio, the distributed function residing on the user equipment (UE) is able to obtain an optimal unique hysteresis for the individual UE. Theoretical analysis with three indication boundaries is provided to evaluate the proposed algorithm. A system-level simulation is presented, and the proposed algorithm outperformed the existing approaches in terms of handover failure, call-drop and redundancy handover ratios and also achieved better overall system performance.