We describe a model-based method of generating realistic mass lesions and placing them in appropriate locations on normal mammogram backgrounds. These lesions are highly irregular in shape and have no consistent internal landmarks. Thin plate splines are used both in modelling the background to each lesion, and to warp examples when training an appearance model.

We describe a new approach to modelling the appearance of structures in grey-level images. We assume that both the shape and grey-levels of the structures can vary from one image to another, and that a number of example images are available for training. A 2-D image can be thought of as a surface in 3 dimensions, with the third dimension being the grey-level intensity at each image point. We ca...

Spatial cognition research has recently made much progress in understanding the cognitive representations and processes underlying human wayfinding. Many theoretical assumptions about the concept of landmark salience have been established. In this context it is important to define perceptual (or visual) and structural landmark salience. Structural salience is defined as the position of a landma...

Computer Vision has recently witnessed great research advance towards automatic facial points detection. Numerous methodologies have been proposed during the last few years that achieve accurate and efficient performance. However, fair comparison between thesemethodologies is infeasiblemainly due to two issues. (a) Most existing databases, captured under both constrained and unconstrained (in-t...

In this work, robot navigation is approached using visual landmarks. Landmarks are not preselected or otherwise defined a priori; they are extracted automatically during a learning phase. To facilitate this, a saliency map is constructed on the basis of which potential landmarks are highlighted. This is used in conjunction with a modeldriven segregation of the workspace to further delineate sea...

This article is a call to describe Participatory Design (PD) projects in the making, i.e. to show how the heterogeneous elements in the field are gradually organised in a participatory manner as the projects progress. It is based on two arguments. The first is a negative argument. Very often, PD projects are not described in the making. As a result, the landmarks to be used to evaluate them rem...

Landmarks play an important role when humans navigate through foreign environments (Lynch, 1960; May, Ross, Bayer, and Tarkiainen, 2003). For example, trying to find the way is much easier if the navigator can rely on a description of the route based on well-recognizable objects in the environment, instead of navigating solely on the basis of street names and metric directions (Tom, and Denis, ...