School of Engineering and Digital Arts

Research seminar(s)

Next Seminar

The School of Engineering and Digital Arts is pleased to announce the next in our series of research seminars.

Compressed Sensing: From theory to practice

Wednesday, 22 November 2017 - 14:00 to 15:00

Stacey Lecture Theatre 2 (SLT2)

Dr Charith Abhayaratne
the University of Sheffield,
Chair: Dr. Chee Siang (Jim) Ang


Compressed sensing (CS), an efficient data acquisition system, reconstructs a signal from highly under-sampled measurements by solving an l1-norm minimisation problem. However, doing so have a couple of limitations. Firstly, the l1-norm minimisation problem has to be solved using iterative optimisation algorithms which have high computational complexity making the time required for the signal reconstruction too large to be desirable in most practical applications. The problem becomes worse with the increase in the size of the signal, preventing the compressed sensing to be applicable to most data-intensive, next-generation contents. Secondly, the reconstruction process loses most of high frequency details leading to poor signal quality. This seminar addresses these two challenges by proposing a modified reconstruction framework, referenced compressed sensing (RefCS), that uses a correlated reference in the reconstruction process. It will also show how this kind of reconstruction can be converted to the least square optimisation leading to lower complexity. It will also show case studies of reconstruction of various typed of data, such as, still images, video and functional MRI data.

Speaker Biography

Dr Charith Abhayaratne 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. He was a recipient of the European Research Consortium for Informatics and Mathematics (ERCIM) Post-Doctoral Fellowship (2002-2004) to carry out research at the Centre of Mathematics and Computer Science (CWI), The Netherlands, and the National Research Institute for Computer Science and Control (INRIA), Sophia Antipolis, France. He is currently a Lecturer with the Department of Electronic and Electrical Engineering, The University of Sheffield, United Kingdom. He is an expert in computer vision engineering, with particular emphasis on video and image coding, content forensics (watermarking and fingerprinting), image and video content analysis, and content-based approaches for visual content management, security, surveillance, assisted living and remote sensing applications. He is an associated editor for Elsevier Journal of Information Security and Applications (JISA) and the United Kingdom’s Liaison Officer for the European Association for Signal Processing (EURASIP). (Tw: @charithmetic W: L: )

Each seminar lasts approximately 60 minutes with a 45 minute prensentation and 15 minutes for questions.

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School of Engineering and Digital Arts, Jennison Building, University of Kent, Canterbury, Kent, CT2 7NT

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Last Updated: 30/08/2017