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This paper considers the problem of detecting elliptical curves using Hough transform (HT) methods. Storage and efficiency problems are overcome by decomposing the problem into two stages. The first stage uses a novel constraint as the basis for a Hough transform to detect the ellipse centre while the second stage finds the remaining parameters using a(More)
We introduce the Adaptive Hough Transform, AHT, as an efficient way of implementing the Hough Transform, HT, method for the detection of 2-D shapes. The AHT uses a small accumulator array and the idea of a flexible iterative "coarse to fine" accumulation and search strategy to identify significant peaks in the Hough parameter spaces. The method is(More)
The problem of automatic threshold selection is considered. After a brief review of available techniques, a novel method is proposed. It is based on image statistics which can be computed without histogramming the grey level values of the image. A detailed analysis of the properties of the algorithm is then carried out. The effectiveness of the method is(More)
The field of Action Recognition has seen a large increase in activity in recent years. Much of the progress has been through incorporating ideas from single-frame object recognition and adapting them for temporal-based action recognition. Inspired by the success of interest points in the 2D spatial domain, their 3D (space-time) counterparts typically form(More)
Within the field of action recognition, features and descriptors are often engineered to be sparse and invariant to transformation. While sparsity makes the problem tractable, it is not necessarily optimal in terms of class separability and classification. This paper proposes a novel approach that uses very dense corner features that are spatially and(More)
The use of sparse invariant features to recognise classes of actions or objects has become common in the literature. However, features are often " engineered " to be both sparse and invariant to transformation and it is assumed that they provide the greatest discriminative information. To tackle activity recognition, we propose learning compound features(More)
The objective of this paper is to investigate a number of circle detection methods which are based on variations of the Hough Transform. The methods considered include the standard Hough Transform, the Fast Hough Transform of Li et al, two space saving approaches which are bused on those devised by Gerig and Klein and a two-stage method. We experimentally(More)