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Short range ad-hoc wireless networks can be used to deliver streaming multimedia for information, entertainment and advertisement purposes. To enable short-range communication between various devices, the Wi-Fi Alliance proposed an extension to the IEEE802.11 Wi-Fi standard called Wi-Fi Peer-to-Peer (P2P). It allows compliant devices to form ad-hoc communication groups without interrupting conventional...
The demand for higher quality video has increased in the past few years, due to the huge amount of electronic devices that process digital video in even higher resolutions. For that purpose, video coding techniques are used, which have, as main goal, the reduction of the required representation to process a digital video. Furthermore, embedded hardware video solutions are sought for both industry...
There is an overwhelming variety of multimedia ontologies used to narrow the semantic gap, many of which are overlapping, not richly axiomatized, do not provide a proper taxonomical structure, and do not define complex correlations between concepts and roles. Moreover, not all ontologies used for image annotation are suitable for video scene representation, due to the lack of rich high-level semantics...
Today, 3-D vector flow imaging (VFI) in a full volume requires a fully populated NxN 2-D matrix array if a sufficient frame rate should be maintained. Such arrays require an expensive ultrasound system, which can handle the enormous data stream created by the N2 channels. As an alternative to the matrix array, N+N 2-D row-column addressed (RCA) arrays were introduced, which reduce the channel count...
Due to the diversity in todays communication networks, adaptability is one of the key requirements in development of a quality multimedia streaming client. In this paper, a system for verification of Hybrid Broadcast Broadband TV (HbbTV) standard, with special emphasis on the Moving Picture Experts Group Dynamic Adaptive Streaming over Hypertext Transfer Protocol (MPEG-DASH) functionality, is given...
YouTube is one of the comprehensive video information source on the web where video is uploading continuously in real time. It is one of the most popular site in social media, where users interact with sharing, commenting and rating (like/views) videos. Generally the quality, relevancy and popularity of the video is maintained based on this rating. Sometimes irrelevant and low quality videos ranked...
The paper discusses the application of System on Chip devices for processing Megapixel video streams. The domain of image processing using high resolution images is very demanding in the scope of calculating power and frequently exploits special processing hardware. The progress of integration technology brings about SoC which are capable of meeting such processing demands. Characteristics of FPGA...
Due to rich characteristics and functionalities, PDF format has become the de facto standard for the electronic document exchange. As vulnerabilities in the major PDF viewers have been disclosed, a number of methods have been proposed to tame the increasing PDF threats. However, one recent evasion exploit is found to evade most of detections and renders all of the major static methods void. Moreover,...
As part of a new MPEG-A standardization activity, called Visual Identity Management Application Format (VIMAF), this paper presents an end-to-end encryption solution of Region of Interest (ROI) in both AVC and HEVC encoded streams for privacy protection applications. This solution uses a selective encryption method that encrypts only the most sensitive information of the video and proposes a new adapted...
In this paper we are investigating how the learning styles and students' assumptions for their preferred educational materials delivery style influence the learning outcomes of the students. We focus on widespread belief that students have specific learning styles and that education should be individualized to the extent that the pedagogy of teaching/learning is matched to the preferred style of the...
Video streaming now amounts to the majority of traffic in the Internet. Media streaming relies on large-scale content distribution networks (CDNs), that incur significant costs to build or use. P2P distribution of video content reduce reliance on CDNs and costs. Unfortunately, P2P distribution is fraught with QoE problems, specially during flash crowds or in scenarios where users have limited bandwidth...
The demands for standardized evaluation of user experience with multimedia services in mobile networks are constantly growing. Therefore, most of the standardization bodies are active in this domain. As a result, several standards for QoE prediction in video streaming systems have been introduced recently. One of them is ITU-T P.1201 with its Amendment n. 2, which has been developed for TCP-based...
Recent advances in video understanding are enabling incredible developments in video search, summarization, automatic captioning and human computer interaction. Attention mechanisms are a powerful way to steer focus onto different sections of the video. Existing mechanisms are driven by prior training probabilities and require input instances of identical temporal duration. We introduce an intuitive...
In this paper, we advocate the notion of "BIG" cache as an innovative abstraction for effectively utilizing the distributed storage and processing capacities of all servers in a cache network. The "BIG" cache abstraction is proposed to partly address the problem of (cascade) thrashing in a hierarchical network of cache servers, where it has been known that cache resources at intermediate...
Video content has become a frequent means of communication on the web and is generated and consumed all the time through websites. Therefore, a study to determine what guidelines should be followed to create efficient designs for these websites is necessary. This paper presents a comparative study of the Nielsen's heuristic evaluation applied to five video websites (Netflix, VideoBrasil Platform,...
Adaptive streaming improves user-perceived quality by altering the streaming bitrate depending on network conditions, trading reduced video bitrates for reduced stall times. Existing adaptation approaches, e.g., rate-based, buffer-based, either rely heavily on accurate bandwidth prediction or can be overly-conservative about video bitrates. In this work, we propose a reinforcement learning approach...
This paper presents an algorithm that achieves high quality video compression with low memory bandwidth of reference frame data and latency due to computation in motion estimation for screen content. Efficiency is attained by content-adaptive placement of the search windows within the reference frames. In our scheme, the center location of the search window is decided by k most prominent motion vectors...
The limited capabilities of Internet of Things (IoT) devices make real-time video streaming a major challenge. Video encoding and transmission are computationally intensive processes. Applications; like urban surveillance and health care monitoring, require real-time high definition video streams. Current video encoders are not designed to meet these requirements, thus alternative architectures, algorithms...
Video streaming applications based on Peer-to-Peer (P2P) systems are popular for their scalability, which is hard to achieve with traditional client-server approaches. In particular, layered video streaming has been much-studied due to its ability to differentiate users' streaming qualities in heterogeneous user environments. Previous work, however, has shown that user misbehavior (e.g., free-riding...
The strain imposed by the bandwidth demands of multimedia applications on wired and wireless networks calls for efficient novel solutions to the problem of network resource allocation, to avoid significant packet losses. In this letter, we focus on a large variety of MPEG-4, H.264 and H.265-encoded video traces. We use the metaheuristic technique of Simulated Annealing to predict the size of B-frames,...
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