Encontrados 10 documentos, a visualizar página 1 de 1
Automated image analysis of lung branching morphogenesis from microscopic image...
Rodrigues, Pedro L.; Rodrigues, Nuno F.; Duque, Duarte; Granja, Sara; Correia-Pinto, Jorge; Vilaça, João L.Background: Regulating mechanisms of branching morphogenesis of fetal lung rat explants have been an essential tool for molecular research. This work presents a new methodology to accurately quantify the epithelial, outer contour and peripheral airway buds of lung explants during cellular development from microscopic images. Methods: The outer contour was defined using an adaptive and multi-scale threshold algo...
Development of a library for clients of ONVIF video cameras: challenges and sol...
Lopes, Sérgio F.; Silva, Sérgio; Mendes, José; Metrôlho, José Carlos; Duque, DuarteThe interoperability of IP video equipment is a critical problem for surveillance systems and other video application developers. ONVIF is one of the two specifications addressing the standardization of networked devices interface, and it is based on SOAP. This paper addresses the development of an ONVIF library to develop clients of video cameras. We address the choice of a web services toolkit, and how to...
People Detection and Tracking using Depth Camera
Silva, Rui; Duque, DuarteIn this paper we present a method for real-time detection and tracking of people in video captured by a depth camera. For each object to be assessed, an ordered sequence of values that represents the distances between its center of mass to the boundary points is calculated. The recognition is based on the analysis of the total distance value between the above sequence and some pre-defined human poses, after...
Color Models and Illumination Changes
Duque, DuarteColor model representation allows characterizing in a quantitative manner, any defined color spectrum of visible light, i.e. with a wavelength between 400nm and 700nm. To accomplish that, each model, or color space, is associated with a function that allows mapping the spectral power distribution of the visible electromagnetic radiation, in a space defined by a set of discrete values that quantify the color com...
Previsão e identificação de eventos de quebra de segurança em vídeo-vigilância
Duque, DuarteTese de doutoramento em Tecnologias e Sistemas de Informação (ramo de conhecimento em Sistemas de Computação e Comunicação) ; Esta tese tem como propósito a detecção e previsão de comportamentos passíveis de originar uma quebra de segurança. Estes são reconhecidos por meio da observação de padrões de actividade humana, extraídos de sequências de imagens digitalizadas, adquiridas por intermédio de uma câmara ...
Prediction of abnormal behaviors for intelligent video surveillance systems
Duque, Duarte; Santos, Henrique Dinis dos; Cortez, Paulo, 1971-IEEE Copyright Policies This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the...
Previsão de eventos anormais em sistemas de vídeo-vigilância
Duque, Duarte; Santos, Henrique Dinis dos; Cortez, Paulo, 1971-Este trabalho tem como propósito a detecção e previsão de comportamentos passíveis de originar uma quebra de segurança. Tais comportamentos são reconhecidos por meio da observação de padrões de actividade humana, extraídos de sequências de imagens digitalizadas adquiridas por intermédio de uma câmara de vídeo a cores, monocular e fixa. A aferição dos comportamentos é suportada pela informação resultante dos pro...
N-ary trees classifier
Duque, Duarte; Santos, Henrique Dinis dos; Cortez, Paulo, 1971-This paper addresses the problem of automatic detection and prediction of abnormal human behaviours in public spaces. For this propose a novel classifier, called N-ary trees, is presented. The classifier processes time series of attributes like the object position, velocity, perimeter and area, to infer the type of action performed. This innovative classifier can detect three types of events: normal; unusual; o...
The OBSERVER : an intelligent and automated video surveillance system
Duque, Duarte; Santos, Henrique Dinis dos; Cortez, Paulo, 1971-Comunicação apresentada na ICIAR, 3, Póvoa de Varzim, Portugal, 2006. ; In this work we present a new approach to learn, detect and predict unusual and abnormal behaviors of people, groups and vehicles in real-time. The proposed OBSERVER video surveillance system acquires images from a stationary color video camera and applies state-of-the-art algorithms to segment and track moving objects. The segmentation is...
Moving object detection unaffected by cast shadows, highlights and ghosts
Duque, Duarte; Santos, Henrique Dinis dos; Cortez, Paulo, 1971-IEEE Copyright Policies: This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||