An approach to vision-based station keeping for an unmanned underwater vehicle

This paper presents an automatic vision-based system for UUV station keeping. The vehicle is equipped with a down-looking camera, which provides images of the sea-floor. The station keeping system is based on a feature-based motion detection algorithm, which exploits standard correlation and explicit textural analysis to solve the correspondence problem. A visual map of the area surveyed by the vehicle is constructed to increase the flexibility of the system, allowing the vehicle to position itself when it has lost the reference image. The testing platform is the URIS underwater vehicle. Experimental results demonstrating the behavior of the system on a real environment are presented

Correction of shading effects in vision-based UUV localization

This paper describes the improvements achieved in our mosaicking system to assist unmanned underwater vehicle navigation. A major advance has been attained in the processing of images of the ocean floor when light absorption effects are evident. Due to the absorption of natural light, underwater vehicles often require artificial light sources attached to them to provide the adequate illumination for processing underwater images. Unfortunately, these flashlights tend to illuminate the scene in a nonuniform fashion. In this paper a technique to correct non-uniform lighting is proposed. The acquired frames are compensated through a point-by-point division of the image by an estimation of the illumination field. Then, the gray-levels of the obtained image remapped to enhance image contrast. Experiments with real images are presented

Towards a real-time vision-based navigation system for a small-class UUV

This paper deals with the problem of navigation for an unmanned underwater vehicle (UUV) through image mosaicking. It represents a first step towards a real-time vision-based navigation system for a small-class low-cost UUV. We propose a navigation system composed by: (i) an image mosaicking module which provides velocity estimates; and (ii) an extended Kalman filter based on the hydrodynamic equation of motion, previously identified for this particular UUV. The obtained system is able to estimate the position and velocity of the robot. Moreover, it is able to deal with visual occlusions that usually appear when the sea bottom does not have enough visual features to solve the correspondence problem in a certain area of the trajectory

VLSI architecture for an Underwater Robot Vision System

It is well known that image processing requires a huge amount of computation, mainly at low level processing where the algorithms are dealing with a great number of data-pixel. One of the solutions to estimate motions involves detection of the correspondences between two images. For normalised correlation criteria, previous experiments shown that the result is not altered in presence of nonuniform illumination. Usually, hardware for motion estimation has been limited to simple correlation criteria. The main goal of this paper is to propose a VLSI architecture for motion estimation using a matching criteria more complex than Sum of Absolute Differences (SAD) criteria. Today hardware devices provide many facilities for the integration of more and more complex designs as well as the possibility to easily communicate with general purpose processors

Accuracy estimation of a new omnidirectional 3D vision sensor

We present a computer vision system that associates omnidirectional vision with structured light with the aim of obtaining depth information for a 360 degrees field of view. The approach proposed in this article combines an omnidirectional camera with a panoramic laser projector. The article shows how the sensor is modelled and its accuracy is proved by means of experimental results. The proposed sensor provides useful information for robot navigation applications, pipe inspection, 3D scene modelling etc

Behaviours implemented using a vision system based on coded light projection

In a search for new sensor systems and new methods for underwater vehicle positioning based on visual observation, this paper presents a computer vision system based on coded light projection. 3D information is taken from an underwater scene. This information is used to test obstacle avoidance behaviour. In addition, the main ideas for achieving stabilisation of the vehicle in front of an object are presented

A Vision of Students Today (2007)

Video produced by Martin Wesch with his students in their Digital Ethnography Class at Kansas State University. Looks at way in which students experience Higher Education. Further information can be found at http://mediatedcultures.net/ksudigg/ You may particularly want to look at a response "A Vision of Professors Today (by Sandra)" http://mediatedcultures.net/ksudigg/?p=125

Pachler N (2008) SCOPING A VISION FOR FORMATIVE E-ASSESSMENT - FEEDBACK Findings from the literature review

Pachler N (2008) SCOPING A VISION FOR FORMATIVE E-ASSESSMENT - FEEDBACK Findings from the literature review

ZeroWIN Vision Conference

*Test* to check feasibility for use for ZeroWIN conference

ZeroWIN Vision Conference July 6 2010 - speakers' presentations

Copy of all presentations from ZeroWIN Vision Conference

Formative Research. An Integral Vision for Health Professionals

These writing conceive formation in formative research as a complex process that demands simultaneous and congruent actions in the objective, subjective and intersubjective fields, adjusted to a careful and progressive planification in order to form teachers, students and management staff as university actors of research processes. Integral formation in formative research into health area demands a comprehensive and broad perspective encompassing science, moral and art, or objective truth, subjective veracity and intersubjective equity. All means must meet towards a strong and developmental formative research culture capable of nourishing subjects engaged in systematic self-questioning, interaction and argumentated debate at the interior of communities of pairs. In the same way, they must have rigorous methodological formation in order to approach the study objects.

Programa de orientación en el desarrollo sensorial para niños y niñas de 3 a 7 años de la fundación children’s vision dirigido a educadoras y profesores

Este trabajo se realiza como un Proyecto de Aplicación Práctica (PAP), en la Especialización de Desarrollo infantil y Procesos de Aprendizaje; se basa principalmente en la teoría de integración sensorial y la relación con el aprendizaje. El objetivo es implementar un programa de desarrollo sensorial para niños y niñas de 3 a 7 años en condiciones de Institucionalización en la Fundación Children’s Vision, orienta a educadoras y profesoras en el manejo de diferentes estrategias y actividades de índole sensorial que permiten al equipo de trabajo y apoyo de la Fundación potencializar comportamientos adaptativos de los niños acordes con las necesidades y desempeño propio para su edad. El programa se divide en tres fases: la primera comprende la recolección de datos acerca del desempeño sensorial de la población a estudio (utilización de lista de chequeo1 y trabajo directo con niños); en la segunda fase se realiza talleres y charlas de sensibilización dirigidas a docentes y educadores; la tercera fase plantea estrategias de manejo en el área sensorial.

Escala de ajuste a la pérdida visual relacionada con la edad : adaptación española de la Age-related Vision Loss Scale (AVL Scale) de A. Horowitz y J. P. Reinhardt.

Resumen tomado de la publicación

Fields of vision. Literature in the english language. 1.

Antología de la literatura en lengua inglesa desde los orígenes hasta la época contemporánea. Su objetivo es inculcar en los estudiantes el amor por la literatura y hacer que participen activamente en la experiencia del aprendizaje a través de: un examen a fondo del mundo literario en inglés basado en una selección equilibrada de autores y textos; una estructura modular en la que cada módulo corresponde a un período histórico / literario; una introducción a la apreciación de los textos literarios a través del análisis de las principales características de los géneros literarios; así como un enfoque flexible, que permite elaborar itinerarios modulares y realizar análisis de texto completo.

Fields of vision. Literature in the english language. 2.

Antología de la literatura en lengua inglesa desde los orígenes hasta la época contemporánea. Su objetivo es inculcar en los estudiantes el amor por la literatura y hacer que participen activamente en la experiencia del aprendizaje a través de: un examen a fondo del mundo literario en inglés basado en una selección equilibrada de autores y textos; una estructura modular en la que cada módulo corresponde a un período histórico / literario; una introducción a la apreciación de los textos literarios a través del análisis de las principales características de los géneros literarios; así como un enfoque flexible, que permite elaborar itinerarios modulares y realizar análisis de texto completo.