Search results for " video"
showing 10 items of 324 documents
Subjective Evaluation of Video on Demand Systems Using Different Network Connections
2009
Nowadays, society makes use of new technologies as they appear. Due to this boom, the use of resources via web is increasing notably. In of training and education cases, companies such as universities are offering tele-learning platforms to complement and facilitate the learning process. Some of these called e-learning platforms can have explanatory videos as a resource for training. For the codification of these videos, we have to use parameters which provide a trade-off between the video sizes to be transmitted that optimize bandwidth and video and audio quality. This paper presents a subjective study of the video quality on transmission depending on the types of users’ network access to …
Copy-move Forgery Detection via Texture Description
2010
Copy-move forgery is one of the most common type of tampering in digital images. Copy-moves are parts of the image that are copied and pasted onto another part of the same image. Detection methods in general use block-matching methods, which first divide the image into overlapping blocks and then extract features from each block, assuming similar blocks will yield similar features. In this paper we present a block-based approach which exploits texture as feature to be extracted from blocks. Our goal is to study if texture is well suited for the specific application, and to compare performance of several texture descriptors. Tests have been made on both uncompressed and JPEG compressed image…
Pārliecināšanas paņēmieni "Rimi" video reklāmās (2020-2021)
2021
Bakalaura darba tēma ir “Pārliecināšanas paņēmieni “Rimi” video reklāmās (2020 - 2021)”, kurā tiek pētīti uzmanības piesaistīšanas elementi “Rimi” video reklāmās un tas, ko auditorija uztver no videoklipos redzētā. Darbs sastāv no teorētiskās, metodoloģiskās un pētnieciskās daļas. Šī darba teorētiskajā daļā apskatīta teorija par pārliecināšanas komunikāciju, uzmanību, reklāmas komunikāciju un uzmanības piesaistīšanu reklāmās. Metodoloģiskajā daļā apskatītas trīs pētnieciskās metodes, kuras tika pielietotas pētnieciskajā daļā - reklāmas videoklipu kontentanalīze, daļēji strukturētā intervija un datu vākšanas metode - anketēšana. Bakalaura darba pētījuma gaitā tika noskaidrots, kādi uzmanības…
Performance evaluation of different techniques to estimate subjective quality in live video streaming applications over LTE-Advance mobile networks
2018
Abstract Current mobile service providers are offering Gigabit Internet access over LTE-Advanced networks. Traditional services, such as live video streaming, over wired networks are feasible on these networks. However different aspects should be taken into account due to the fast changing network conditions as well as the constrained resources of the mobile phones, in order to provide a good subjective video quality in terms of Mean Opinion Score (MOS). Our goal is to estimate and predict this subjective metric without information or reference from the original video, known as Non Reference approach. This approach is important for the Service Provider from a practical point of view, becaus…
PerceptNet: A Human Visual System Inspired Neural Network for Estimating Perceptual Distance
2019
Traditionally, the vision community has devised algorithms to estimate the distance between an original image and images that have been subject to perturbations. Inspiration was usually taken from the human visual perceptual system and how the system processes different perturbations in order to replicate to what extent it determines our ability to judge image quality. While recent works have presented deep neural networks trained to predict human perceptual quality, very few borrow any intuitions from the human visual system. To address this, we present PerceptNet, a convolutional neural network where the architecture has been chosen to reflect the structure and various stages in the human…
Autentiskie video materiāli runātprasmju pilnveidei 8. klasē
2016
Diplomdarba mērķis bija pārbaudīt, kā autentiskie video materiāli ietekmē runāšanas prasmes 8. klasē. Diplomdarba autors uzskata, ka spēja izteikt viedokli ir prasme, kuru katram studentam vajadzētu prast pielietot. Turklāt, teorijas avoti apstiprina to, ka autentiskie video var iespaidot runāšanas prasmes. Izvēlētā pētījuma metode bija atsevišķa gadījuma pētījums Valsts Ģimnāzijā. Datu vākšanas metodes bija anketa, pašvērtējuma lapa skolēniem un vērtēšanas kritēriji, ko dokumentēja darba autors. Lai pārbaudītu autentisko video ietekmi, tika novadītas 3 stundas. Pētījuma rezultāti atklāja, ka skolēniem patika strādāt ar autentiskiem materiāliem un viņi velējās izpaust savu viedokli angļu va…
TED TALKS izmantošana skolēnu runāšanas prasmju attīstīšanai angļu valodas stundās 11. klasē
2019
Diplomdarba mērķis ir noskaidrot kā TED Talks video ietekmē skolēnu runātprasmi angļu valodas stundās 11. klasē. Šāda diplomdarba tēma tika izvēlēta , jo autore uzskata, ka runātprasmju veicināšana ir vitāli svarīga angļu valodas stundu sastāvdaļa. Izvēlētā pētījuma metode bija gadījuma analīze Valmieras Viestura vidusskolas 11. klasē. Datu vākšanas metodes bija skolēnu aptaujas un runāšanas prasmju novērtēšana. Tika novadītas astoņas stundas, lai noskaidrotu TED Talks ietekmi uz skolēnu sniegumu. Pētījums atklāja skolēnu pozitīvo attieksmi pret TED Talks video lietošanu, kā arī varēja novērot skolēnu līdzdalības uzlabošanos. Autore secināja, ka TED Talks video var tikt izmantoti, lai veici…
Video-assisted two-stage basilic vein transposition for creation of brachio-basilic arteriovenous fistulae
2012
We report our experience in a mixed minimally-in- vasive technique for the two-stage transposition of basilic vein on a small series of eight patients. The operative tech- nique consisted of a modified endoscopic (1) approach for the two-stage transposition (2). The intervention was performed under Brachial Plexus Block (3).
Mündliche Kompetenz und Bewusstsein beim unterrichtlichen Fremdsprachenlernen
2014
Das Buch befasst sich mit dem Zusammenspiel von kognitiven, emotionalen und motivationalen Faktoren beim Aufbau von mündlicher Kompetenz in Deutsch als Tertiärsprache bei erwachsenen Italienern. Es stützt sich dabei auf ein interdisziplinäres Vorgehen, das theoretisch erörtert und in seiner Methodenwahl ausführlich dargelegt wird, insbesondere die Videografie sowie intro-/retrospektive Verfahren. Die Ergebnisse der Studie veranschaulichen die Lernprozesse einmal klassenübergreifend, zum anderen erfolgt eine detaillierte Analyse der einzelnen Lernenden. Das Literaturverzeichnis liefert Lehrenden, Studierenden und Forschern eine erschöpfende bibliographische Quelle zu den behandelten Themen.
Gastric antisecretory drugs induce leukocyte-endothelial cell interactions through gastrin release and activation of CCK-2 receptors.
2007
Antisecretory drugs are effective antiulcer agents, but its chronic use generates hypergastrinemia and accelerates the development of atrophic gastritis in Helicobacter pylori-positive patients. We have recently shown that gastrin exerts a proinflammatory effect in rats through CCK-2 receptor activation that contributes to the inflammation induced by H. pylori. The present study was designed to examine whether gastrin hypersecretion in response to treatment with antisecretory drugs induces an inflammatory response that could promote mucosal atrophy. The effects of omeprazole or famotidine on leukocyte/endothelial cell interactions in vivo were analyzed in rat mesenteric venules using intrav…