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Department of Physics: Recent submissions

  • Night Time Detection of Vehicles 
    Perera,Sakunika; Sonnadara, D.U.J. (2010)
    This paper presents results of a study carried out to count and classify vehicles in video sequences of traffic scenes captured from a fixed digital camera under night conditions. The vehicle identification has been ...
  • Analysis of wet and dry behavior of weather through Markov models 
    Piyadasa, P.M.; Sonnadara, D.U.J. (2010)
    This study attempts to model the daily rainfall climatology of Sri Lanka using Markov models at three selected weather stations where long term data records were available. Both the first and the second order Markov ...
  • Pedestrian Collision Detection through Monocular Vision 
    Wannige, C.T.; Sonnadara, D.U.J. (2010)
    In this paper, a depth detection based on monocular vision coupled with the motion was used to predict the possible collisions on pedestrian crossings. A video taken while in motion is extracted into frames and processed ...
  • Surface colour variation of Papaya fruits with maturity 
    Amarasinghe, D.I.; Sonnadara, D.U.J. (2009)
    Surface colour considered as a quality parameter change with the maturity of fruits. Many unripe fruits initially show greenish surface colour which gradually changes to yellow colour when they mature. The change of ...
  • Simulation of lightning discharges: Influence of ground objects and positive leaders 
    Perera, M.D.N.; Sonnadara, D.U.J. (2009)
    Cloud-to-ground (CG) lightning discharges in 3D domain were simulated using a stochastic dielectric breakdown model. The influence of ground objects on simulated lightning flashes was studied by introducing additional ...
  • Climate change in the hill country of Sri Lanka 
    De Silva, G.J.; Sonnadara, D.U.J. (2009)
    This paper describes an analysis of long term changes in precipitation and temperature over 5 stations in the hill country of Sri Lanka during the period 1869 – 2006. The trend is predicted by a least squares regression ...
  • Effect of roadside vegetation on the reduction of traffic noise levels 
    Kalansuriya, C.M.; Pannila, A.S.; Sonnadara, D.U.J. (2009)
    A study was carried out to determine the effect of roadside vegetation on the reduction of road traffic noise levels under varying traffic conditions. Roadside vegetation which have the potential to act as noise barriers ...
  • Detection and Extraction of Road Traffic Signs 
    Wanniarachchi, W. K. I. L.; Sonnadara, D.U.J.; Jayananda, M.K. (2008)
    The real-time road traffic sign recognition focused on the application of computer vision techniques in automatic detection and classification of video images of traffic signs placed on roadways acquired from moving ...
  • Estimation of the Speeds of Moving Vehicles from Video Sequences 
    Wimalaratna, L.G.C.; Sonnadara, D.U.J. (2008)
  • Detection of License Plates of Vehicles 
    Wanniarachchi, W. K. I. L.; Sonnadara, D.U.J.; Jayananda, M. K. (2007)
    This paper presents an image processing approach for the detection of the vehicle license plate area in digitized photographic images. The algorithm takes a raster image of the rear view of a vehicle as input and yields ...
  • 3D Modelling of Electrical Discharges 
    Amarasinghe, D. I.; Sonnadara, D.U.J. (2007)
    Long electrical discharge patterns in 3D were simulated using a stochastic dielectric breakdown model. The 2D stochastic model introduced by the Niemeyer et al. was modified to simulate the electrical breakdowns in 3D. To ...
  • Modelling Wind Speed Distributions in Selected Weather Stations 
    Fernando, W. P. L.; Sonnadara, D.U.J. (2007)
    Modelling daily wind speed data by using the two parameter Weibull distribution for ten selected weather stations in Sri Lanka is presented. The daily wind speed data measured by the Department of Meteorology at the heights ...
  • Hardware Implementation of Random Number Generators 
    Wijesinghe, W.A.S.; Jayananda, M.K.; Sonnadara, D.U.J. (2006)
    Random numbers are used in a wide variety of applications. True random number generators are slow and expensive for many applications while pseudo random number generators (RNG) suffice for most applications. Although a ...
  • Development of a Road Traffic Noise Prediction Model 
    Sooriyaarachchi, R.T.; Sonnadara, D.U.J. (2006)
    Environmental noise is an undesirable byproduct of urbanization. Although we do not notice, this unwanted or excessive sound makes a significant damage to the health of the people and has hazardous impacts on the environment. ...
  • Rainfall Forecasting: An Artificial Neural Network Approach 
    Kumarasiri, A.D.; Sonnadara, D.U.J. (2006)
    An innovative technique is utilized for rainfall forecasting using Artificial Neural Networks based on feed-forward back-propagation architecture. Focus is set upon making successful predictions from the available data, ...
  • CPLD Based Simple Microprocessor for Data Acquisition 
    Wijesinghe, W.A.S.; Jayananda, M.K.; Sonnadara, D.U.J. (2005)
    This paper describes a simple microprocessor developed using a Complex Programmable Logic Device (CPLD), with an instruction set optimized for data acquisition applications. Most low-cost data acquisition systems are built ...
  • Text To Speech Conversion - Tamil Language 
    Philips, N.; Sonnadara, D.U.J.; Jayananda, M.K. (2005)
    A text-to-speech conversion engine was developed for Tamil language that could successfully convert any arbitrary Tamil text into spoken utterance. The back-end of the engine was a sound database created with 343 phonemes ...
  • Vitual Robot Arm Control Model 
    Kottege, D.N.D.; Sonnadara, D.U.J. (2004)
    A Six-axis Virtual Robot arm (SVR) was designed with adjustable kinematic parameters to mimic a 6-axis articulate robotic manipulator with revolute joints having 6 degrees of freedom. The screen based interface was ...
  • Using time and frequency domain information for the development of adaptive voice control devices 
    Edirisinghe, E.P.N.S.; Sonnadara, D.U.J. (2004)
    A simple voice recognizer was implemented with the aim of building voice control devices by utilizing a cascade LPC with adaptive fuzzy interface system (FIS). The accuracy of the voice recognizer depends on the complexity ...
  • Performance of adaptive-fuzzy technique in controlling vehicular traffic 
    Sonnadara, D.U.J.; Fernando, W.S. (2002)
    A vehicular traffic control system was designed with an inexpensive OOPIC micro controller. The information on vehicular traffic at the junction was simulated and fed to the microcontroller and was used as the primary ...

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