Search results for " Video"
showing 10 items of 324 documents
Do Current Domestic Gigabit Wireless Technologies Fulfill User Requirements for Ultra High Definition Videos?
2017
We present the results from a measurement-based performance evaluation of wireless networks based on IEEE 802.11n and IEEE 802.11ac standards in an indoor environment, with the aim to analyze their performance under high definition streaming video applications. We focus our study on analyzing the highest performance of these standards using off-the-shelf equipment, both with synthetic TCP and UDP traffic to measure the saturation throughput as well as high definition video streams. The measurements have been conducted in the student labs of our university and show good performance for streaming purposes in high definition and also ultra-high definition from a subjective video quality point …
COVID-19: A Survey on Public Medical Imaging Data Resources
2020
This regularly updated survey provides an overview of public resources that offer medical images and metadata of COVID-19 cases. The purpose of this survey is to simplify the access to open COVID-19 image data resources for all scientists currently working on the coronavirus crisis.
The impact of irreversible image data compression on post-processing algorithms in computed tomography
2020
PURPOSE: We aimed to evaluate the influence of irreversible image compression at varying levels on image post-processing algorithms (3D volume rendering of angiographs, computer-assisted detection of lung nodules, segmentation and volumetry of liver lesions, and automated evaluation of functional cardiac imaging) in computed tomography (CT). METHODS: Uncompressed CT image data (30 angiographs of the lower limbs, 38 lung exams, 20 liver exams and 30 cardiac exams) were anonymized and subsequently compressed using the JPEG2000 algorithm with compression ratios of 8:1, 10:1, and 15:1. Volume renderings of CT angiographies obtained from compressed and uncompressed data were compared using objec…
Low Complexity Image Compression using Pruned 8-point DCT Approximation in Wireless Visual Sensor Networks
2017
International audience; Since the transmission of the uncompressed image in the context of wireless visual sensor networks (WVSNs) consumes less energy than transmitting the compressed image, developing energy-aware compression algorithms are mandatory to extend the camera node's lifetime and thereby the whole network lifetime. The present paper studies a low-complexity image compression algorithm in the context of WVSNs. This algorithm consists of applying a pruning approach on a DCT approximation transform. The scheme is investigated in terms of computation cycles, processing time, energy consumption and image quality. Experimental works are conducted using the Atmel Atmega128 processor o…
BlockSee: Blockchain for IoT video surveillance in smart cities
2018
The growing demand for safety in urban environments is supported by monitoring using video surveillance. The need to analyze multiple video-flows from different cameras deployed around the city by heterogeneous owners introduces vulnerabilities and privacy issues. Video frames, timestamps, and camera settings can be digitally manipulated by malicious users; the positions of cameras, their orientation and their mechanical settings can be physically manipulated. Digital and physical manipulations may have several effects, including the change of the observed scene and the potential violation of neighbors' privacy. To face these risks, we introduce BlockSee, a blockchain-based video surveillan…
TRECVID 2006 - An overview
2006
TRECVID 2005 - An Overview
2005
University Students as Composers of a Digital Video
2013
This paper introduces a university course in which digital video composing was used as a study method. The aim of the course was to empower future teachers to use digital and multimodal literacy practices in their own teaching. Students in education, 13 in total, participated in the course on digital literacies. The course achievement was measured with the task in which students composed a video in small-groups. The students’ videos were supposed to convince a pedagogical target group about the usefulness of a teaching method or need for a reform. In the last meeting, student’s videos were watched and the contents of the videos were discussed. The experiences on composing a digital video we…
La videorreseña y la creación de comunidades lectoras en la formación inicial de docentes.
2021
El uso del vídeo con finalidades didácticas para la mejora del aprendizaje lingüístico y literario presenta múltiples posibilidades en el mundo educativo, entre otras, la exploración de los cambios discursivos que se producen en los géneros que presentan nuevas variantes en este formato, como es el caso de las videorreseñas. El cambio de formato conlleva la necesidad de crear una situación de comunicación acorde con la finalidad que se pretende, en la que los recursos que permite el vídeo estén al servicio del tipo de enunciador y de destinatario creados por los reseñadores. La reseña en vídeo se convierte así no solo en una variante técnica sino también discursiva, que busca nuevas formas …
Utvikling, testing og evaluering av en videobasert læringsressurs for selvstyrt bedriftsopplæring : En casestudie fra Posten Norge AS
2017
Masteroppgave Multimedia and Educational Technology MM500 - Universitetet i Agder 2017 Opplæring av ansatte er arbeidsgivers plikt og arbeidstakers rett, og er derfor en sentral del ved ethvert arbeidsforhold. Ansattes mulighet for utvikling og innflytelse i egen arbeidssituasjon har også vist seg å være fundamentale drivere for engasjement på arbeidsplassen. I samsvar med den teknologiske utviklingen muliggjør det for design av effektive læringsressurser som kan bidra med å tilgjengeliggjøre læringsmateriell, og på samme tid være med på å engasjere ansatte ved gjennomføring av bedriftsopplæring. I nåværende opplæringssituasjon i Posten Norge AS er det kun én metode for opplæring av postbud…