Roger D. Boyle

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BACKGROUND There are approximately 1.8 million patients with angina in the United Kingdom, many of whom report a poor quality of life, including raised levels of anxiety and depression. AIM To evaluate the effect of a cognitive behavioural disease management programme, the Angina Plan, on psychological adjustment in patients newly diagnosed with angina(More)
This paper discusses methods behind tracker evaluation, the aim being to evaluate how well a tracker is able to determine the position of a target object. Few metrics exist for positional tracker evaluation; here the fundamental issues of trajectory comparison are addressed, and metrics are presented which allow the key features to be described. Often(More)
A system for the tracking and classification of livestock movements is presented. The combined ‘tracker-classifier’ scheme is based on a variant of Isard and Blakes ‘Condensation’ algorithm [Int. J. Comput. Vision (1998) 5] known as ‘Re-sampling Condensation’ in which a second set of samples is taken from each image in the input sequence based on the(More)
Tracking sports players over a large playing area is a challenging problem. The players move quickly, and have large variations in their silhouettes. This paper presents a framework for multi-object tracking, using a CONDENSATION based approach. Each player being tracked is independently fitted to a model, and the sampling probability for the group of(More)
The conference on grand challenges, held in Newcastle on 30 and 31 March 2004, occurred at a particularly opportune time. The strand on the educational aspects was particularly relevant and the idea innovative in the sense that this was the first occasion on which a grand challenge event with a focus on educational issues in computing had taken place. This(More)
Terahertz pulsed imaging is a spectroscopic imaging modality using pulses of electromagnetic radiation (100 GHz-10 THz), and there has been recent interest in studying biomedical specimens. It is usual to display parametric images derived from the measured pulses. In this work, classification was achieved by applying multispectral clustering techniques to(More)
Models of collective animal behaviour, such as the ocking of birds, are usually based upon simulations that appear to exhibit properties of the animals in question. In this paper, we describe an alternative approach; that of automatically extracting a model of animal behaviour from video sequences of real animals. Point distribution models (PDMs) are used(More)