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Ageing societies and the increase in chronic disabilities are irrevocable trends in the EU which usually result in a loss of autonomy and increased social isolation. Many people with complex disabilities face increased isolation due to loss of independent mobility because of difficulties of meeting the criteria for the provision of an Electric Powered Wheelchair (EPW) and the availability of an appropriate...
In this paper, we propose a fast online background subtraction algorithm detecting a contiguous foreground. The proposed algorithm consists of a background model and a foreground model. The background model is a regression based low rank model. It seeks a low rank background subspace and represents the background as the linear combination of the basis spanning the subspace. The foreground model promotes...
This paper introduces a new framework to improve the performance of Viola and Jones face detector on omnidirectional unwrapped images. First, an optimization scheme is used to improve the unwrapped image specifically for rectangular Haar-like features. Then, we compare our unwrapping approach to the performance obtained with spherical unwrapping. The impact of the decision boundary and candidate window...
Our work and living environments are increasingly populated by devices which integrate computational ability and intelligence. The Nomad Biometric Authentication (NOBA) project focuses on the development and implementation of biometric technologies for strong authentication to enable provision of nomadic computing users with services and document dematerialization in secure information and communication...
A stereoscopic catadioptric sensor and associated algorithms are presented to provide a relevant solution to the problem of 3D reconstruction of unknown environments. A novel calibration methodology is detailed, establishing a discrete relation between 3D points and the corresponding pixels. The 3D reconstruction adopted is an adaptation of the classic volumetric scene reconstruction technique. Complete...
Catadioptic sensors, the association of a camera and a mirror, are powerful systems in applications such as robotics, tracking and surveillance where a large field of view is required. This paper deals with the calibration of a stereo catadioptric system used to provide a 3D reconstruction of a scene. This stereo bench is made of two panoramic vision systems, one above the other. Firstly, we present...
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