Salient points are very important for image description because they are related to the visually most important parts of the image, leading to a compact and more discriminative representation close to human perception. ...

This thesis deals with the recognition of shapes in digital images. A suitable shape representation is derived by analyzing invariance to perturbations that do not significantly affect visual recognition: contrast changes, ...

Currently, given the widespread of computers through society, the task of recognizing visual patterns is being more and more automated, in particular to treat the large and growing amount of digital images available. Two ...

We present a scalable and unsupervised approach for content-based retrieval on 3D model collections. Our goal is to represent a 3D shape as a set of discriminative local features, which is important to maintain robustness ...

Contour polygonal approximation is usually defined as a set of selected points, which describes a polygon and best represents the original contour. This paper presents a novel graph based approach to compute a polygonal ...

The neural representation of sound in the auditory cortex is not invariably predetermined by its  acoustical properties, but it is constantly reshaped while the listener acquires new experiences. Such plastic changes are ...