Terrestrial Oceanic Ridges and Lunar Mare Ridges

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...

Fingerprint matching using ridges

Traditionally, fingerprint matching is minutia-based, which establishes the minutiae correspondences between two fingerprints. In this paper, a novel fingerprint matching algorithm is presented, which establishes both the ridge correspondences and the minutia correspondences between two fingerprints. First N initial substructure (including a minutia and adjacent ridges) pairs are found by a nov...