Search results for "video"
showing 10 items of 1348 documents
Tiešraides straumēšanas kvalitātes uzlabošanas metodes
2015
Maģistra darba „Tiešraides straumēšanas kvalitātes uzlabošanas metodes” pētīšanas procesā autors izpēta un analizē tiešraides straumēšanas tehnoloģijas, tās kvalitātes kritērijus. Tiek izpētītas un salīdzinātas pašlaik populārākie datoru un mobilu platformu straumēšanas risinājumi, to aspekti un izplatība mūsdienās. Papildus tika izpētītas digitālas televīzijas iespējas un kvalitātes kritēriji, kā arī, balstoties uz autora darba pieredzi multimediju sfērā - digitāla kanāla palaišanas iespējas. Apkopojot maģistra darba iegūtos rezultātus, autors izstrādā un piedāvā universālu straumēšanas risinājumu, kura pamatā ir dažādu mobilo iekārtu izmantošana.
Do Sign Language Videos Improve Web Navigation for Deaf Signer Users?
2010
The efficacy of video-based sign language (SL) navigation aids to improve Web search for Deaf Signers was tested by two experiments. Experiment 1 compared 2 navigation aids based on text hyperlinks linked to embedded SL videos, which differed in the spatial contiguity between the text hyperlink and SL video (contiguous vs. distant). Deaf Signers’ performance was similar in Web search using both aids, but a positive correlation between their word categorization abilities and search efficiency appeared in the distant condition. In Experiment 2, the contiguous condition was compared with a text-only hyperlink condition. Deaf Signers became less disorientated (used shorter paths to find the tar…
Comparison of region of interest segmentation methods for video-based heart rate measurements
2018
International audience; Conventional contact photoplethysmography (PPG) sensors are not suitable in situations of skin damage or when unconstrained movement is required. As a consequence, remote photoplethysmography (rPPG) has recently emerged because it provides remote physiological measurements without expensive hardware and improves comfort for long-term monitoring. RPPG estimation methods use the spatially averaged RGB values of pixels in a Region Of Interest (ROI) to generate a temporal RGB signal. The selection of ROI is a critical first step to obtain reliable pulse signals and must contain as many skin pixels as possible with a low percentage of non-skin pixels. In this paper, we ex…
Non-abelian gauge structure in neutrino mixing
2010
We discuss the existence of a non-abelian gauge structure associated with flavor mixing. In the specific case of two flavor mixing of Dirac neutrino fields, we show that this reformulation allows to define flavor neutrino states which preserve the Poincar\'e structure. Phenomenological consequences of our analysis are explored.
The Impact of Macroeconomic Variables on Corporate Performance - What Shareholders Ought to Know?
2002
Increased integration and growing macroeconomic fluctuations require more attention to be paid to the link between the "noise" that these fluctuations represent and the company's own development. For many reasons management must weed out the effects of the "noise" so as to obtain a clear picture of the long-term sustainable profits, and thus a picture of how the company's intrinsic competitiveness is fostered. An understanding of the effects of the fluctuations also provides the basis for risk assessment. How far, then, should this "new" view of corporate performance be extended to outsider shareholders? Current reporting practice does not provide these shareholders with an adequate idea of…
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 …
Associations between parental rules, style of communication and children's screen time
2015
Background Research suggests an inverse association between parental rules and screen time in pre-adolescents, and that parents’ style of communication with their children is related to the children’s time spent watching TV. The aims of this study were to examine associations of parental rules and parental style of communication with children’s screen time and perceived excessive screen time in five European countries. Methods UP4FUN was a multi-centre, cluster randomised controlled trial with pre- and post-test measurements in each of five countries; Belgium, Germany, Greece, Hungary and Norway. Questionnaires were completed by the children at school and the parent questionnaire was brough…
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.
A Database of Spectral Filter Array Images that Combine Visible and NIR
2017
International audience; Spectral filter array emerges as a multispectral imaging technology, which could benefit several applications. Although several instantiations are prototyped and commercialized, there are yet only a few raw data available that could serve research and help to evaluate and design adequate related image processing and algorithms. This document presents a freely available spectral filter array database of images that combine visible and near infra-red information.
Image Processing Techniques For the Detection and Classification of Man Made Objects in Side-Scan Sonar Images
2011
This is a review chapter that surveys past work in, and the recent status of image processing and other related techniques involved in the detection and classification of man made objects in side scan sonar images. Side scan sonar is a readily, available and cheap device which has found increasing applications, specially for military purposes such as Computer Aided Detection (CAD) and Classification (CAC) of mines. Therefore the main focus of the chapter is on this topic. The list of references is sufficiently complete to include most past and recent publications in the open refereed literature. Although side scan sonar displays many features similar to an optical sensor from a purely image…