Department of Engineering / Profiles / Dr Joan Lasenby

Department of Engineering

Dr Joan Lasenby


Joan Lasenby

Reader in Signal Processing

Academic Division: Information Engineering

Research group: Signal Processing and Communications

Telephone: +44 1223 3 32639


Personal website


Research interests

Motion Capture

Research interests include both markered and markerless motion capture.

Geometric Algebra

Geometric Algebra (GA) is a mathematical framework based on the algebra of William Kingdon Clifford. It works with scalars, vectors, bivectors (oriented areas), trivectos (oriented volumes) etc., and provides us with an algebra which is capable of manipulating all of these quantities in one system. One of the major advantages of GA is the ease with which it deals with rotations, of any quantity and in any dimension.

Structured Light Plethysmography

Structured Light Plethysmography (SLP) is a non-invasive technique for measuring lung function in humans and animals. We employ a multiple camera system and a projector to dynamically reconstruct the moving surface of the chest and abdomen via features extracted from structured light.

Inertial Navigation

This project [Liam Candy, PhD topic] explores a Geometric Algebra approach to the inertial navigation problem. Firstly the 3D equations are rewritten to express the attitude computations in terms of bivectors and then this is extended to 5D to incorporate both attitude and position.

Gait and Rehabilitation

The Signal Processing Group collaborates with Dr Adar Pelah on a number of gait/rehabilitation related projects. These involve investigating the interactions of humans in virtual environments with a view to providing real-time visual feedback for a number of activities.

Teaching activity

  • IB Signal and Data Analysis
  • IIB Image Processing and Image Coding
  • IA Exposition
  • IB Information Engineering Laboratories

Other positions

College Lecturer and Director of Studies in Engineering, Trinity College


Joan Lasenby received her undergraduate BA degree and Part III qualification, in Mathematics from Trinity College, Cambridge. Her PhD was in Radio and Molecular Studies of the Galactic Centre at the Mullard Radio Astronomy Observatory (now the Astrophysics Group), Cavendish Laboratories, University of Cambridge. Between the BA and Part III she taught mathematics for a year as a graduate assistant in Louisiana State University (LSU). From 1987-90 she held a Junior Research Fellowship at Trinity Hall, Cambridge, which was followed by a year working for Marconi Maritime Applied Research Laboratory in the Mathematical Modelling group. From 1994 to 2000 she held a Royal Society University Research Fellowship for research into Applications of Geometric Algebra in Engineering, and was a fellow of Newnham College.