Dr Charith Abhayaratne

Staff Photo

Contact Details


Tel: +44 (0)114 22 25893

ORCID: 0000-0002-2799-7395

Staff website
Twitter: @charithmetic
Linkedin: charithabhayaratne
Google Scholar: goo.gl/YXLcoC


  • PhD (Electronic and Electrical Engineering), The University of Bath, UK 2002
  • BE Class 1 Hons. (Electrical and Electronic Engineering), The University of Adelaide, Australia, 1998
  • PGCertHE, The University of Sheffield, UK, 2008

Research Activities

  • Signal, image, video and graph processing and analysis.
  • Multi-modal sensing, data analysis, computer vision and machine learning.
  • Multimedia security: watermarking, fingerprinting and block chain technology
  • Video and image coding and streaming.
  • Applications in creative industries, security, surveillance, assisted living, healthcare, remote sensing, digital manufacturing, agri-tech and international standards (JPEG and MPEG).


  • Module leader - EEE6209 Advanced Signal Processing
  • EEE Foundation year tutor

Research Group: Communications


I received the B.E. degree in electrical and electronic engineering from The University of Adelaide, Australia, in 1998, and the Ph.D. degree in electronic and electrical engineering from the University of Bath, U.K., in 2002. I am a recipient of the Alain Bensoussan Fellowship awarded by the European Research Consortium for Informatics and Mathematics (ERCIM) to carry out postdoctoral research at the Centre of Mathematics and Computer Science (CWI), The Netherlands (2002), and the National Research Institute for Computer Science and Control (INRIA), Sophia Antipolis, France (2003). During the fellowship, my research was on adaptive wavelet transforms for image and video coding and analysis. After the fellowship, I was a postdoctoral research associate at Queen Mary, University of London, where I worked on wavelet based scalable video coding research. In 2005, I joined the University of Sheffield as a lecturer.

My research is focussed on signal processing and machine learning for multimedia security, automated understanding of visual content (computer vision) and video coding. I lead a group of researchers working on these topics. In terms of multimedia security, I am working on methodologies for robust and imperceptible data hiding and exploring block-chain technology for multimedia content tracking and protection. In terms of visual content understanding, my current work is on understanding and modelling of visual salience in the context of robotic and UAV applications, automated recognition of human activities of daily living in the context of assisted living and modelling of complex 2D and 3D shapes leading to real time number and object recognition. In terms of video coding, current research includes coding of high dynamic range (HDR) video, ultra high definition (UHD) video and 360 degrees video. Current and recently concluded research has been funded by Innovate UK, EPSRC and Industry sponsors.

Currently I am an associated editor for Elsevier Journal of Information Security and Applications (JISA) and was a guest editor for Signal Processing: Image Communication (in 2009). I am the UK Liaison for the European Association for Signal Processing (EURASIP) and a member of the IEEE Multimedia Communications technical committee. In 2017, I became member of the EPSRC peer review college. I was a committee member of the British Standards Institution (BSI) group IST/037 coding of picture, audio, multimedia and hypermedia information (2004-2010). During that period, I was involved in the scalable video standardisation and wavelet video exploration activities within the ISO/IEC Moving Picture Expert Group (MPEG). This year I am delivering a tutorial on Multimedia Cyber Security at the IEEE ICIP 2018, a flagship conference of the IEEE Signal Processing Society.

Research Students

Student Degree Status Primary/Secondary
Pal S PhD Graduated Primary
Bhowmik D PhD Graduated Primary
Feng T PhD Graduated Primary
Hotrakool W PhD Graduated Primary
Majid M PhD Graduated Primary
Oakes M PhD Graduated Primary
Wang Y PhD Graduated Primary
Dai X MPhil Graduated Primary
Yu Z MPhil Graduated Primary
Angadi V PhD Graduated Secondary