The interest on acquiring player and ball data during soccer games is increasing in several domains such as media or training. Consequently, tracking systems are becoming widely used for live data gathering. However, due to costs, stadium infrastructure, media rights etc. there is a trend for stand-alone mobile low-cost soccer tracking systems. The drawback of such systems is that generally onl...

snow cover area is one of the most important criteria to calculate snow melt runoff. this can have an effect on the biology of the plant and the environment of a region. using the catchment basin physical characteristic to calculate snow cover area is a conventional method, though its accuracy is not good enough. most of the useful methods in calculating snow cover area are based on satellite i...

Let X and A be compact metric spaces. The main problem studied in this paper is that of finding conditions under which a map f : A → X can be lifted to a cell-like space; i.e., conditions are sought under which there exist a cell-like continuum Z and continuous maps g : Z → X and f ′ : A → Z such that g ◦ f ′ = f . A theorem is proved which spells out technical conditions on the embedding of A ...

This paper describes a novel method to resample cartesian images to a retina-like hexagonal tessellation, consisting of foveal and peripheral regions. We introduce the inflated-hexagons model for the foveal region resampling, which has an efficient data structure for storage and mapping of cortical coordinates. The integral image representation is used as intermediate step for the peripheral re...

The study of sign languages provides a wide field of applications for computer vision systems, but the analysis of such gestures often leads to complex 3D reconstructions or to ambiguities. In this paper, we describe the architecture of an image analysis system that performs sign language analysis by using a prediction/verification approach. The system integrates a model of the sign language’s ...

We are interested in the development of an efficient computational visual system to study dynamic fluids. So, in this paper, we present a methodology to detect patterns in flow-like images. These patterns are called, in the Dynamical Systems theory, critical points or single points. This method involves four steps: estimation of flow directions; matching; critical point confirmation, and critic...

The recognition of people orientation in single images is still an open issue in several real cases, when the image resolution is poor, body parts cannot be distinguished and localized or motion cannot be exploited. However, the estimation of a person orientation, even an approximated one, could be very useful to improve people tracking and re-identification systems, or to provide a coarse alig...