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Many image-database retr-ieual systems rely heavily on the success oj one-shot queries, using optimised jemkre sets to obtain the best possible results. What is ojten missing jt-om this appToach is acceptance oj the fact that the user knows considerably more about the query being made than cm. be conveyed in szch Relatively simple terms. Ij the query jails(More)
The location of the optic disc is of critical importance in retinal image analysis. In this work we improve on an approach introduced in [3] who localised an optic disc region through greylevel morphology followed by snake fitting. We propose and implement both the automatic initialisation of the snake and the application of morphology in colour space. We(More)
After segmenting candidate exudates regions in colour retinal images we present and compare two methods for their classification. The Neural Network based approach performs marginally better than the Support Vector Machine based approach, but we show that the latter are more flexible given criteria such as control of sensitivity and specificity rates. We(More)
This paper describes recent work on a neural network approach to outdoor scene interpretation. The results of evaluating a range of automatic region-based segmentation techniques based on a new segmentation quality metric are presented. The optimal technique is used to segment images of natural outdoor scenes. A powerful set of features designed for outdoor(More)
Retinal exudates are a characteristic feature of many retinal diseases such as Diabetic Retinopathy. We address the development of a method to quantitatively diagnose these random yellow patches in colour retinal images automatically. After a colour normalisation and contrast enhancement pre-processing step, the colour retinal image is segmented using Fuzzy(More)
Image segmentation is the first stage of processing in many practical computer vision systems. While development of particular segmentation algorithms has attracted considerable research interest, relatively little work has been published on the subject of their evaluation. In this paper we propose the use of the Pareto front to allow evaluation and(More)
This article describes work on a novel approach to vision enhancement for people with severe visual impairments. This approach utilizes computer vision techniques to classify scene content so that visual enhancement of the scene can identify semantically important concepts. The mediated view of a scene presented to the user is in the form of a(More)