Sammanfattning: Det är minst lika många människor som besöker arrangemang och gudstjänster i kyrkor som besöker idrottsevenemang. Det behövs studiogudstjänster dock sänds det allt färre Tv-gudstjänster direkt från kyrkor och medlen för att göra detta är också på väg att minskas. Många som ser dessa gudstjänster har av olika orsaker inte möjlighet att besöka en kyrka. Detta kan t ex bero på funktionshinder och sjukdom men också att många äldre har svårt att förflytta sig och se gudstjänster live. Ett sätt för kyrkorna att nå ut på bredare front skulle kunna vara att använda sig av Internet som media. Syftet med uppsatsen är att genom intervjuer, användningstestning och slutligen prototyptestning, ta fram en lösning för digital överföring av ljud och bild från ett ställe till ett annat via ett IP-nätverk och finna en avvägning mellan det tekniska och användbarheten då användaren har begränsad teknisk kunskap. Vid datainsamlingen användes en kvalitativ forskningsprocess med intervjuer och observation som insamlingstekniker. Vid användningstesterna användes observation som metod och testpersonerna uppmanades att tänka högt. Analysen av testerna visade vikten av att minimera inblandning av för mycket teknik i lösningarna då områdeskunskapen hos användare varierar kraftigt.

The development of the information and communications technology has enabled digital contents to be aggregated for better customer services. The purpose of this thesis is to investigate whether different types of content aggregators have different marketing strategies. In this research, content aggregators in Taiwan are divided into two categories. Their market positioning and market-mix strategies are compared. Six companies with different market positions were investigated and the result indicates that they are different in many of their marketing strategies, including the breadth and depth of product lines, pricing strategies, content delivery channels, and promotion. Suggestions for their future improvement are discussed.

Thesis (Ph.D.)--University of Florida, 2005. / Title from title page of source document. Document formatted into pages; contains 101 pages. Includes vita. Includes bibliographical references.

Title from PDF of title page (University of Missouri--Columbia, viewed on March 10, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Thesis advisor: Dr. Wenjun Zeng. Includes bibliographical references.

Thesis (Ph. D.)--School of Electrical and Computer Engineering, Georgia Institute of Technology, 2004. Directed by Yucel Altunbasak. / Vita. Includes bibliographical references (leaves 141-146).

Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, September 2003. / Thesis advisor(s): Norman F. Schneidswind, Brian Steckler. Includes bibliographical references (p. 35-37). Also available online.

Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003. / Includes bibliographical references (leaves 57-58). Also available in electronic version. Access restricted to campus users.

A large amount of digital visual data is being distributed and communicated globally and the question of video quality control becomes a central concern. Unlike many signal processing applications, the intended receiver of video signals is nearly always the human eye. Video quality assessment algorithms must attempt to assess perceptual degradations in videos. My dissertation focuses on full reference methods of image and video quality assessment, where the availability of a perfect or pristine reference image/video is assumed. A large body of research on image quality assessment has focused on models of the human visual system. The premise behind such metrics is to process visual data by simulating the visual pathway of the eye-brain system. Recent approaches to image quality assessment, the structural similarity index and information theoretic models, avoid explicit modeling of visual mechanisms and use statistical properties derived from the images to formulate measurements of image quality. I show that the structure measurement in structural similarity is equivalent to contrast masking models that form a critical component of many vision based methods. I also show the equivalence of the structural and the information theoretic metrics under certain assumptions on the statistical distribution of the reference and distorted images. Videos contain many artifacts that are specific to motion and are largely temporal. Motion information plays a key role in visual perception of video signals. I develop a general, spatio-spectrally localized multi-scale framework for evaluating dynamic video fidelity that integrates both spatial and temporal aspects of distortion assessment. Video quality is evaluated in space and time by evaluating motion quality along computed motion trajectories. Using this framework, I develop a full-reference video quality assessment algorithm known as the MOtion-based Video Integrity Evaluation index, or MOVIE index. Lastly, and significantly, I conducted a large-scale subjective study on a database of videos distorted by present generation video processing and communication technology. The database contains 150 distorted videos obtained from 10 naturalistic reference videos and each video was evaluated by 38 human subjects in the study. I study the performance of leading, publicly available objective video quality assessment algorithms on this database. / text

published_or_final_version / Computer Science and Information Systems / Master / Master of Philosophy

Verification of digital video information authentication At present numerous devices that display video data not in an analogous, but in a digital format appeared. Security and authentication of received digital data is becoming a point of high importance. Leading manufacturers of security video systems that employ digital data receivers are working on the development of new devices. Software engineers study possibilities of the implementation of image authentication algorithms by means of marking an image by means of watermarks. This method requires significant investments. Less simple and cheap authentication methods are based on a method of digital image comparison. This study dwells on the issue of picsel data authentication by means of comparison of color code totals. A number of alternatives of image comparison algorithms were applied. Reliability and efficiency of these algorithms were analyzed. Three basic formats that are widely used in security and photo business were taken for the analysis. The developed software facilitates to perform a graphic analysis of used algorithms. The software was developed for the purpose of the study and further can form a part of system authentication.