1,721,041 research outputs found
Design of a Cost Effective Spatial Image Registration System for Augmented Reality in Vehicular Applications
No full textThe paper describes the design and validation of a spatial image registration algorithm for a vehicular Head-Mounted Augmented Reality (AR) system. AR can considerably improve the driving experience by increasing the driver's situational awareness. AR can only work if stable and realistic holograms are generated. The process of generating the holograms so that they appear in a specific position in the world is also known as image registration. Since AR devices employ see-through Head-Mounted Displays, realistic image registration requires high-accuracy head tracking. Solutions exist in static environments where state-of-the-art simultaneous localization and mapping algorithms suffice. Vehicles are more challenging. In aerospace, costly optical-inertial tracking systems are regularly employed. This paper focuses instead on low-cost ground vehicles and proposes a solution that does not require aerospace-grade Inertial Measurement Units and is easily integrable on cars. The proposed solution, tested on a racing circuit, is based on passive markers and on the stereoscopic detection of the road plane on which the AR features are anchored
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Letter to the Editor: Reflections on the case report of sudden unexpected death due to B-ALL in a 3-Year-Old child
No full textHead-up Displays for Augmented Reality Applications in Racing Vehicles: a Feasibility Study
No full textThis paper studies the applicability of Augmented Reality Head-Up Displays (HUD) to car racing applications. HUD have been used for years in avionics to effectively represent environmental cues to the pilot without the need to look at the instruments. Recent advances in technology claim that similar systems can be developed for cars. HUD have been available for cars for some time, but have been exploited only as virtual dashboards. This paper looks into the potential benefits and limitations of truly Augmented Reality for car racing. In particular, the objective is to highlight the curbs of the track so to help the driver plan the best trajectory. We develop the algorithms needed to detect the curb and project its position on the HUD. We show that, in order to provide a precise projection of the cue, the attitude of the vehicle needs to be estimated and the information from a camera needs to be merged with a map of the racing track. We test the approach on an experimental vehicle rigged to emulate a HUD. The results indicate that, while the algorithms can be designed to be robust and precise, they require a very large Field of View
METODO E SISTEMA DI ASSISTENZA ALLA GUIDA DI UN VEICOLO
Full text linkLa presente invenzione riguarda un metodo di assistenza alla guida di un veicolo. Il metodo è implementato da un sistema comprendente un HMD e un modulo di posizionamento montato sul veicolo, laddove lo HMD comprende un visore e una coppia di videocamere situate ai lati opposti del visore lungo una direzione di estensione principale del visore.
Il metodo comprende i passi di:
a. acquisire una coppia di immagini per mezzo dello HMD, ciascuna immagine essendo acquisita da una rispettiva telecamera dello HMD e riprendendo una medesima porzione di campo visivo, detta medesima porzione di campo visivo comprendendo una porzione di superficie stradale;
b. stimare una posizione in uno spazio tridimensionale di ciascun punto compreso nella medesima porzione di campo visivo sulla base della coppia di immagini acquisite e delle caratteristiche delle videocamere;
c. stimare un volume di interesse dello spazio tridimensionale comprendente la porzione di superficie stradale sulla base della coppia di immagini acquisite e di una posizione determinata dal modulo di posizionamento in corrispondenza dell’acquisizione della coppia di immagini;
d. selezionare un sottoinsieme di punti compresi nella medesima porzione di campo visivo e compresi nel volume di interesse;
e. calcolare una superficie planare corrispondente alla superficie stradale sulla base della posizione stimata dei punti compresi nel sottoinsieme di punti selezionati, e
f. riprodurre un’immagine bidimensionale sul visore dello HMD in modo che risulti disposta sulla superficie planare corrispondente alla superficie stradale calcolata al passo e
Assessment of Cervical Skeletal Trauma: The Synergistic Contribution of Forensic and Clinical Medicine to a Case of Corpse Concealment
Full text linkFatal neck injuries represent a major challenge in forensic pathology because the anatomical complexity and high variability of neck structures make it often extremely difficult to differentiate true pathological findings from artifacts at autopsy. This topic becomes even more relevant when the forensic pathologist is required to make a pathophysiological evaluation of bone fractures in the absence of soft tissue to support the diagnosis. We report a case of unidentified, stone-covered, skeletonized human remains found within a pit below an abandoned building with bony lesions of the cervical spine and ribs, including a full-thickness fracture of the right lateral mass of the atlas (C1). After a careful study of the fractures was carried out by screening forensic literature and anthropological studies, clinical neurosurgical expertise was called upon to provide a reliable explanation. A rapid and violent twisting of the neck in the opposite direction from the fracture site by an attacker who pinned the victim’s torso is the scenario that most likely occurred in our case. This case report shows that the diagnosis of cervical spine injuries in skeletal remains should be the result of a multidisciplinary approach that integrates forensic, anthropological, and clinical expertise
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Estimation of Late Postmortem Interval: Where Do We Stand? A Literature Review
Full text linkEstimating time since death can be challenging for forensic experts, and is one of the most challenging activities concerning the forensic world. Various methods have been assessed to calculate the postmortem interval on dead bodies in different stages of decomposition and are currently widely used. Nowadays, the only well-recognized dating technique is carbon-14 radioisotope measurement, whereas other methods have been tested throughout the years involving different disciplines with different and sometimes not univocal results. Today, there is no precise and secure method to precisely determine time since death, and late postmortem interval estimation remains one of the most debated topics in forensic pathology. Many proposed methods have shown promising results, and it is desirable that with further studies some of them might become acknowledged techniques to resolve such a difficult and important challenge. The present review aims at presenting studies about the different techniques that have been tested in order to find a valuable method for estimating time since death for skeletal remains. By providing a comprehensive overview, the purpose of this work is to offer readers new perspectives on postmortem interval estimation and to improve current practice in the management of skeletal remains and decomposed bodies
- …
