L’Écrivain et ses institutions, sous la direction de Roger Marchal

Dans ce riche volume préfacé par Roger Marchal (pp. 7-20) et organisé en deux parties («Institutions et prix littéraires au fil des siècles», pp. 23-324, et «L’Académie française, du xviiie siècle à nos jours», pp. 325-465), l’histoire littéraire porte son regard sur les institutions qui contribuent à la naissance ou à la reconnaissance des écrivains. Dans la distribution séculaire, des origines à nos jours, cinq articles concernent la première moitié du xixe siècle. Vincent Laisney (pp. 267-..

A MULTI-SLICE MODEL OBSERVER FOR MEDICAL IMAGE QUALITY ASSESSMENT

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Numerical Stability issues on Channelized Hotelling Observer under different background assumptions

International audienceThis paper addresses the numerical stability issue on the channelized Hotelling observer (CHO). The CHO is a well-known approach in the medical image quality assessment domain. Many researchers have found that the detection performance of the CHO does not increase with the number of channels, contrary to expectation. And to our knowledge, nobody in this domain has found the reason. We illustrated that this is due to the ill-posed problem of the scatter matrix and proposed a solution based on Tikhonov regularization. Although Tikhonov regularization has been used in many other domains, we show in this paper another important application of Tikhonov regularization. This is very important for researchers to continue the CHO (and other channelized model observer) investigation with a reliable detection performance calculation

Study of video quality assessment for telesurgery

elemedicine provides a transformative practice for access to and delivery of timely and high quality healthcare in resource-poor settings. In a typical scenario of telesurgery, surgical tasks are performed with one surgeon situated at the patient’s side and one expert surgeon from a remote site. In order to make telesurgery practice realistic and secure, reliable transmission of medical videos over large distances is essential. However, telesurgery videos that are communicated remotely in real time are vulnerable to distortions in signals due to data compression and transmission. Depending on the system and its applications, visual content received by the surgeons differs in perceived quality, which may incur implications for the performance of telesurgery tasks. To rigorously study the assessment of the quality of telesurgery videos, we performed both qualitative and quantitative research, consisting of semi-structured interviews and video quality scoring with human subjects. Statistical analyses are conducted and results show that compression artifacts and transmission errors significantly affect the perceived quality; and the effects tend to depend on the specific surgical procedure, visual content, frame rate, and the degree of distortion. The findings of the study are readily applicable to improving telesurgery systems

Livrable D5.2 of the PERSEE project : 2D/3D Codec architecture

Livrable D5.2 du projet ANR PERSEECe rapport a été réalisé dans le cadre du projet ANR PERSEE (n° ANR-09-BLAN-0170). Exactement il correspond au livrable D5.2 du projet. Son titre : 2D/3D Codec architectur

Le théâtre de Dumas père, entre héritage et renouvellement

Ce livre part d'un constat : malgré une abondante production, étalée sur près de cinquante ans, le théâtre de Dumas subit aujourd'hui une indéniable éclipse. Or, son auteur a joué un rôle de premier plan dans la « bataille » romantique ; il a continué sans interruption d'écrire pour la scène jusqu'à sa mort ; refusant l'exclusive, il a pratiqué tous les genres. Il laisse un corpus officiel de soixante-six pièces, en réalité plus de cent si l'on comptabilise les textes non signés mais où sa collaboration est attestée. Cette œuvre s'inscrit dans un héritage, revendiqué ou implicite, de l'Antiquité à la production contemporaine : tragédie classique et néo-classique, comédie d'intrigue et de caractère, scène historique, drame bourgeois, vaudeville, mélodrame, proverbe… Elle en fait un usage complexe, entre emprunts, variations et détournements, en jouant de la contamination entre modèles « nobles » et modèles « mineurs ». Parcouru par un double processus d'assimilation et de transformation, le théâtre de Dumas fonctionne comme un creuset dramatique ; il fait évoluer les genres, modernise les enjeux et renouvelle le spectaculaire, marquant ainsi un repère capital pour les générations suivantes. Travail collectif d'une équipe de chercheurs engagés dans la publication du Théâtre complet de Dumas, ce volume veut rendre hommage à la richesse et à la diversité d'une œuvre qui résume un demi-siècle de vie dramatique

KEY ISSUES AND SPECIFICITIES FOR THE OBJECTIVE MEDICAL IMAGE QUALITY ASSESSMENT

Though several objective image quality assessment methods originally proposed for natural images and videos have been used in the context of medical images, some important specificities usually ignored have to be considered. This paper presents a review on some key issues (diagnostic task, pathology, figure of merit, expertise, validation subjective experimental protocol, etc.) that must be considered for the objective quality assessment of still radiographic images acquired from the acquisition systems of varied imaging modalities. 1

An overview of model observers

International audienceNowadays, model observers have been used more and more for the objective quality assessment of medical images. Model observers have been developed from signal known exactly (SKE) task to signal known statistically (SKS) task, from single-slice (2D) to multi-slice (3D), in order to be more clinical relevant. In this paper, we give an overview of existing model observers up to date

QoE for Telemedicine: Challenges and Trends

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