The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Due to the recent advances in ultra high definition (UHD) displays, UHD TV may replace HD TV in a near future. However, little is known about the effect of UHD content on human visual perception, specifically, on human visual attention, viewing strategies, and visual saliency. To help studying these properties of the human visual system and their dynamics when HD content is replaced with UHD content,...
When users give ratings in subjective Quality of Experience experiments, they may experience a lack of confidence in assigning a score to a stimulus. This results in invalid votes that might need to be removed from the acquired data. We show results from a subjective video quality experiment in which we measured the rating times and asked observers for their confidence, in addition to just the quality...
In this paper, a subjective assessment methodology based on ranking, reordering and image categorization is proposed. It is designed to facilitate the evaluation of complex features such as monocular depth cues in natural images. These features can be particularly challenging to explain to test participants, and the proposed methodology is designed to provide to the test participants more insights...
We report here how depth of field (DOF) affects the aesthetic appeal of photographs for different content categories. 339 photographs spanning eight categories were selected from Flickr, Google+, and personal collections. First, we classified the 339 photographs into three levels of depth of field: small, medium, and large. Then, we asked participants to rate the aesthetic appeal of these photographs...
ITU-T P.800 Absolute Category Rating (ACR) listening tests are an important tool for evaluating the audio quality of codecs for telephony. However, listener responses in these tests do not only depend on the audio quality of the items heard but also on the preceding items and the given ratings given to them. Here we investigate how strong these effects are in typical ACR listening tests and to what...
From the perspective of teaching practical application, the principles and objectives of the design of multiwindow multimedia teaching platform are discussed. Based on C++ and software dynamic integration technology, the key technologies of multiwindow multimedia teaching platform implementation are presented and stated in detail.
Delay has been found as one of the most crucial factors determining the Quality of Experience (QoE) in synchronous video-mediated communication. The effect has been extensively studied for dyadic conversations and recently the study of small group communications has become the focus of the research community. Contrary to dyads, in which the delay is symmetrically perceived, this is not the case for...
With the aim of improving the immersive experience of the end user, High Dynamic Range (HDR) imaging has been gaining popularity. Therefore, proper validation and performance benchmarking of HDR processing algorithms is a key step towards standardization and commercial deployment. A crucial component of such validation studies is the selection of a challenging and balanced set of source (reference)...
Although web applications are well known for performance variations during a session, the impact of network quality fluctuations on user-perceived quality has been neglected so far in QoE research. In this paper, we present the results of two subjective lab experiments which investigated the influence of outages, throughput alternations and increasing/decreasing throughput on Web QoE. We found that...
This paper investigates what composes the quality of videos displayed on LCD with local backlight dimming. In a subjective experiment, participants assessed the level of nine attributes defined using the Qualitative Descriptive Analysis method. Results show that three attributes (Contrast, Change over time and Grain) vary significantly depending on the backlight dimming algorithm. Predicting global...
In this paper we present results from the Quality of Experience (QoE) evaluation of two commercially available games on four different smartphones and tablets with screen sizes between 3.27″ and 10.1″. The tests were conducted in a neutral lab and a simulated metro environment. Results show a considerable impact of display size on overall quality as well as four out of seven Player Experience dimensions...
In this work the effect of reproduction setup on the perception of natural scene attributes was studied. Discrimination of reproduced real-world scenes in movement, openness and noisiness was inspected between an immersive large reproduction setup and a non-immersive small reproduction setup. The results show decreased sensitivity for movement discrimination and increased sensitivity for noisiness...
We propose a model for rating behavior based on subject bias and subject error. Evidence for subject bias can be found in freely available subjective experiments. When subject bias is removed from ratings, the sensitivity of statistical comparisons between stimuli usually improves. According to our model, subject biases characterize the subject pool. These between-subject differences are important...
In the cultivation of Chinese education scheme in modern vocational colleges, not only includes the demand for educators but also Chinese educators that have higher education quality. Education concept and methods also began to develop in the direction of informationization, diversification, and emotionalization. Higher vocational education is a type of education; it plays a very important role in...
With the development of network and multimedia technique, the transfer of multimedia content becomes popular. The relations between distributors get hierarchical and diversified. As far as digital wholesale and retail are concerned, the traditional fingerprint which helps traitor tracing cannot achieve effective tracing of colluding middlemen. Therefore, we improve the multiple watermarking schemes,...
This paper proposes a video retargeting method. The method makes multimedia more suitable for ubiquitous video access, including comfortable watching, interesting region detection and safety transmitting. Because of the rapid progress of electronic commercial product, video service needs to adapt different device. There are some challenges: First at all, the resolution, aspect ratio and size of display...
Image retargeting means to change the aspect ratio and resolution of an image in order to display it on different devices. During retargeting, how to keep significant image areas from obvious distortion is the main consideration. The seam carving method handles the challenge by recursively removing pixel seam with minimal cost. Though it can generate convincing results, the computation needed to find...
This paper elaborates on the design of a prototype framework for the exploitation of virtual Network Functions (NFs) and virtual Network Resources (NRs) in a cloud-based network architecture. The proposed framework is based on a Marketplace approach, utilizing a centralized network architecture, where the exploitation of the available NFs/NRs is managed by a Brokerage Module. This Brokerage Module...
The overwhelming amounts of digital images on the Web and personal computers have triggered the requirement of an effective tool to retrieve images of interest using semantic concepts. Due to the semantic gap between low-level features of image content and its high-level conceptual meaning, however, the performances of many existing automatic image annotation algorithms are not so satisfactory. In...
Big data processing is one of the hot scientific issues in the current social development. MapReduce is an important foundation for big data processing. In this paper, we propose a semantic++ MapReduce. This study includes four parts. (1) Semantic++ extraction and management for big data. We will do research about the automatically extracting, labeling and management methods for big data's semantic++...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.