Winter-talus ridges, nivation ridges, and pro-talus ramparts

Marching ridges

Marching Ridges is an algorithm for finding ridges of measurement functions defined for images, in which the ridges are defined as level sets of first derivatives of the measurement functions. Marching Ridges is both specific in its application to 2D and 3D medical images for the purpose of finding cores, and general in its theoretical application to finding ridges of intensity, boundary and me...

Do fingerprint ridges and characteristics within ridges change with pressure?

On Ridges and Valleys

Ridges and valleys are earth’s relief structures. They can have an imaging counterpart provided we model a digital image as a landscape by considering grey level values as height. These two dual entities have received comparatively little attention from the computer vision community with regard to others like edges or corners. In this paper we first propose a taxonomy or classification of the s...

Smoothings, Ridges, and Bumps

In this paper, we seek to formulate a geometrically based alternative to nonlinear, nonparametric regression. Hastie and Stuetzle (1989) introduced the ideas of principal curves and surfaces. These were 1and 2-dimensional non-linear regression-type estimators, which were consistent with respect to the mean, i.e. involved conditional expectations. We have developed a similar notion, but with two...

Enucleation of the Talus

Enucleation or triple dislocation of the talus is a rare injury; in literature, it represents 2 to 10% of the talar trauma. The prognosis for this type of injury is dominated by the risk of osteonecrosis. We report a case of closed enucleation of the talus, treated in a conservative manner with satisfactory functional outcome. It's a patient of 32 years, victim of a road traffic accident that r...