Plane-to-plane positioning from image-based visual servoing and structured light

In this paper we face the problem of positioning a camera attached to the end-effector of a robotic manipulator so that it gets parallel to a planar object. Such problem has been treated for a long time in visual servoing. Our approach is based on linking to the camera several laser pointers so that its configuration is aimed to produce a suitable set of visual features. The aim of using structured light is not only for easing the image processing and to allow low-textured objects to be treated, but also for producing a control scheme with nice properties like decoupling, stability, well conditioning and good camera trajectory

A new optimised De Bruijn coding strategy for structured light patterns

Coded structured light is an optical technique based on active stereovision that obtains the shape of objects. One shot techniques are based on projecting a unique light pattern with an LCD projector so that grabbing an image with a camera, a large number of correspondences can be obtained. Then, a 3D reconstruction of the illuminated object can be recovered by means of triangulation. The most used strategy to encode one-shot patterns is based on De Bruijn sequences. In This work a new way to design patterns using this type of sequences is presented. The new coding strategy minimises the number of required colours and maximises both the resolution and the accuracy

Implementation of a robust coded structured light technique for dynamic 3D measurements

This paper presents the implementation details of a coded structured light system for rapid shape acquisition of unknown surfaces. Such techniques are based on the projection of patterns onto a measuring surface and grabbing images of every projection with a camera. Analyzing the pattern deformations that appear in the images, 3D information of the surface can be calculated. The implemented technique projects a unique pattern so that it can be used to measure moving surfaces. The structure of the pattern is a grid where the color of the slits are selected using a De Bruijn sequence. Moreover, since both axis of the pattern are coded, the cross points of the grid have two codewords (which permits to reconstruct them very precisely), while pixels belonging to horizontal and vertical slits have also a codeword. Different sets of colors are used for horizontal and vertical slits, so the resulting pattern is invariant to rotation. Therefore, the alignment constraint between camera and projector considered by a lot of authors is not necessary

SLAM using an Imaging Sonar for Partially Structured Underwater Environments

In this paper we describe a system for underwater navigation with AUVs in partially structured environments, such as dams, ports or marine platforms. An imaging sonar is used to obtain information about the location of planar structures present in such environments. This information is incorporated into a feature-based SLAM algorithm in a two step process: (I) the full 360deg sonar scan is undistorted (to compensate for vehicle motion), thresholded and segmented to determine which measurements correspond to planar environment features and which should be ignored; and (2) SLAM proceeds once the data association is obtained: both the vehicle motion and the measurements whose correct association has been previously determined are incorporated in the SLAM algorithm. This two step delayed SLAM process allows to robustly determine the feature and vehicle locations in the presence of large amounts of spurious or unrelated measurements that might correspond to boats, rocks, etc. Preliminary experiments show the viability of the proposed approach

Dissolution of Dynamic Electronic Institutions, a first approach: Relevant factors and causes

In the context of the digital business ecosystems, small organizations cooperate between them in order to achieve common goals or offer new services for expanding their markets. There are different approaches for these cooperation models such as virtual enterprises, virtual organizations or dynamic electronic institutions which in their lifecycle have in common a dissolution phase. However this phase has not been studied deeply in the current literature and it lacks formalization. In this paper a first approach for achieving and managing the dissolution phase is proposed, as well as a CBR process in order to support it in a multi-agent system

JISC TechDis Accessibility essentials guide: Making electronic documents more readable

The TechDis Accessibility Essentials Guide for Reading has been divided into the following three sections: Font colours and styles; Enlarging text and Navigating documents. These guides have been designed to give practical step-by-step information to enable anyone reading electronic material to amend its look and feel into a style which suits them, their audience or the context in which it is used.

EPS (Electronic Portfolio System)

In 2001, before the term “e-portfolio” was common parlance there was a perceived need to enable teachers in training to save, store, present and archive their electronically-based work so that it could be assessed by tutors. A Teacher Training Agency (TTA) Grant was used to design and implement an online system for trainee teachers to save evidence of their activities called Electronic Portfolio System (EPS). Over the years, its use and value has changed and, through the support of the Teacher Development Agency for schools (TDA), the system will continue to develop. The features of the system have grown organically because of technology changes and by tutors and mentors identifying affordances. This presentation will identify the principles and how they guide the development process. It will give an opportunity to elucidate the next stages in e-portfolio developments.

Electronic theses and dissertations at Virginia Tech.

Virginia Tech has been depositing e-theses for over a decade and is a leader in the field. University of Southampton introduced e-thesis deposit in the academic session 2008-09

Maths for Electronic Engineers

Exercises and solutions for a second year engineering maths course. Diagrams for the question are all together in the support.zip file, as .eps files

Privacy and Electronic Communications

slides for a class which explores professional, ethical and legal issues surround the use, storage and transmission of electronic communications and data. Follows on from previous class which looked in greater detail at the Data Protection Act

A User-Centric Approach to eCertificate for Electronic Identities (eIDs) Management in Mobile Environment

The use of electronic documents is constantly growing and the necessity to implement an ad-hoc eCertificate which manages access to private information is not only required but also necessary. This paper presents a protocol for the management of electronic identities (eIDs), meant as a substitute for the paper-based IDs, in a mobile environment with a user-centric approach. Mobile devices have been chosen because they provide mobility, personal use and high computational complexity. The inherent user-centricity also allows the user to personally manage the ID information and to display only what is required. The chosen path to develop the protocol is to migrate the existing eCert technologies implemented by the Learning Societies Laboratory in Southampton. By comparing this protocol with the analysis of the eID problem domain, a new solution has been derived which is compatible with both systems without loss of features.

Electronic systems/resources introduction

Presentation guide for Tom and Paul - apologies for quality/lack-of-rehersal. It was only intended as a mic-check, but I got carried away.

The Peruvian Citizen Perception and Expectation toward the e-Government. The Electronic Tax Payment Successful e-Gov Project

En este capítulo, los autores tratan de demostrar como los gobierno latinoamericanos, específicamente el peruano, evalúan los esfuerzos que realizan en la implementación de iniciativas de gobierno electrónico, identificando las expectativas que tienen los ciudadanos frente a estas iniciativas y como las perciben, aplicando un modelo de evaluación al servicio de  pago electrónico de impuestos implementado como una iniciativa exitosa en Latinoamérica. El modelo propuesto fue desarrollado por uno de los autores como parte de su tesis doctoral y evaluado por el otro como jurado en el tribunal de la misma. Incluye cinco constructos latentes independientes, actitud, aptitud, confianza, relevancia y satisfacción que afecta a dos constructos latentes dependientes, la percepción y la expectativa frente a su relación con la administración pública vía el uso de las tecnologías de la información y las comunicaciones – TIC, bajo el efecto de variables ilustrativas relacionadas con los ciudadanos, las instituciones y el contexto.

¿Impactó el programa de Tutores Pares a sus tutores?

Introducción: El programa de Tutores Pares-TP es una iniciativa creada en la EMCS de la Universidad del Rosario que brinda acompañamiento académico a través de estudiantes-tutores a pares menos avanzados. Éste entrega a sus Tutores sistemáticamente, herramientas para desempeñarse armónicamente en el ejercicio de guía y provee habilidades para el manejo del saber. Este estudio busca explorar posibles ´impactos´ generados tras la participación de estudiantes de medicina como TPs dentro de un programa estructurado. Materiales y métodos: Estudio cualitativo que involucró la construcción y aplicación de encuestas a grupos focales –TPs, Docentes y Familiares- creadas a partir de seis ejes/categorías que enmarcan al médico ideal. Las respuestas obtenidas de preguntas cerradas –en escala valorativa- y de naturaleza abierta fueron sometidas a análisis descriptivo –modas- y triangulación. Resultados: 41 tutores, agrupados en 4 grupos de análisis, evidenciaron un impacto general positivo con predominio en habilidades interpersonales (60%,65%,66%,45%, respectivamente), funciones/actividades basadas en la práctica y mejoramiento (57%,67%,60%,45%) y la forma como se emplean los conocimientos (47%,70%,67%,48%). Ocho docentes encuestados consideraron relevante el impacto del programa en habilidades interpersonales-(49%), conocimientos-(42%) y la interacción con colegas-(38%). En los padres de familia hay consenso en el cambio en habilidades interpersonales, funciones basadas en la práctica y mejoramiento y en actitudes-valores ético/morales. Dichos resultados están en paralelo con las observaciones plasmadas en las preguntas abiertas. Conclusiones: Se evidenció un impacto general positivo en la formación y desempeño profesional tras la participación como TPs dentro del programa; hallazgo que soporta aquellos publicados de experiencias académicas similares.