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Quarterly published in print and online "Inventi Impact: Digital Multimedia Broadcasting" publishes high quality unpublished as well as high impact pre-published research and reviews catering to the needs of researchers and professional engineers. The journal deals with multiple aspects of digital multimedia broadcasting pertaining to mobiles, televisions etc.
We consider a face-to-face\nvideoconferencing system that uses a Kinect camera at\neach end of the link for 3D modeling and an ordinary\n2D display for output. The Kinect camera allows\na 3D model of each participant to be transmitted;\nthe (assumed static) background is sent separately.\nFurthermore, the Kinect tracks the receiverÃ¢â?¬â?¢s head,\nallowing our system to render a view of the sender\ndepending on the receiverÃ¢â?¬â?¢s viewpoint. The resulting\nmotion parallax gives the receivers a strong impression\nof 3D viewing as they move, yet the system only needs\nan ordinary 2D display. This is cheaper than a full\n3D system, and avoids disadvantages such as the need\nto wear shutter glasses, VR headsets, or to sit in a\nparticular position required by an autostereo display.\nPerceptual studies show that users experience a greater\nsensation of depth with our system compared to a\ntypical 2D videoconferencing system....
This paper proposed a broadcast Channel Assignment Mechanism on base of\noptimized Broadcast Tree for wireless Mesh network (WMN), which is created by Branch and\nBound Method. The simulations show that our algorithm not only reduces the broadcast\nredundancy but also avoids the potential channel interferences produced by unnecessary relay\nnodes....
Data stream mining has become a research hotspot in data mining and has attracted the attention of many scholars. However, the\ntraditional data stream mining technology still has some problems to be solved in dealing with concept drift and concept\nevolution. In order to alleviate the influence of concept drift and concept evolution on novel class detection and classification, this\npaper proposes a classification and novel class detection algorithm based on the cohesiveness and separation index of Mahalanobis\ndistance. Experimental results show that the algorithm can effectively mitigate the impact of concept drift on classification and\nnovel class detection....
We investigate into the potentiality of an enhanced Power and Location-based Vertical Handover (PLB-VHO) approach, based\r\non a combination of physical parameters (i.e., location and power attenuation information), for mobile-controlled connectivity\r\nacrossUMTS and WLAN networks.We show that the location information in amultiparameter vertical handover can significantly\r\nenhance communication performance. In the presented approach a power attenuation map for the visited area is built and\r\nkept updated by exploiting the information sharing of power measurements with other cooperating mobile devices inside the\r\nvisited networks. Such information is then used for connectivity switching in handover decisions. The analytical model for the\r\nproposed technique is first presented and then compared with a traditional Power-Based approach and a simplified Location-Based\r\ntechnique. Simulation results showthe effectiveness of PLB-VHOapproach, in terms of (i) network performance optimization and\r\n(ii) limitation of unnecessary handovers (i.e., mitigation of ping-pong effect)....
Video surveillance is an effective way to record current events. In view of the difficulty of efficient transmission of massive\nsurveillance video and the risk of leakage in the transmission process, a new data encryption and fast transmission algorithm is\nproposed in this paper. From the perspective of events, the constraints of time and space dimension is broken. First, a\nbackground and moving object extraction model is built based on video composition. Then, a strong correlation data encryption\nand fast transmission model is constructed to achieve efficient data compression. Finally, a data mapping mechanism is\nestablished to realize the decoding of surveillance video. Our experimental results show that the compression ratio of the\nproposed algorithm is more than 60% under the premise of image confidentiality....
A new distance-aware broadcasting algorithm was proposed to enhance the propagation distance in the latency time of safetyrelated\nmessage broadcasting. The IEEE 802.11p standard states that if the medium is detected as idle, a station would defer its\ntransmission within a backoff time to avoid collisions with other stations.The backoff times follow uniform distribution over [0,\nCW]. In this way, fairness among all the stations can be guaranteed. However, propagation distance was ignored and in safetyrelated\nmessage broadcasting fairness is not the most important issue. In the proposed algorithm, the lengths of backoff times\nare generated from a nonuniform distribution.They are related with the distances between the source station and its forwarding\nstations.The farthest forwarding station has the highest probability to forwardmessages. Performance of the proposed algorithmis\nanalyzed by using a 2D Markov chain. Analytical and simulation results demonstrate that the proposed algorithm can enhance\nthe performance of safety-related message broadcasting in terms of propagation distance, which is reflected by the successful\ntransmission probability. The proposed algorithm does not need additional waiting time, RTS/CTS, and ACK, therefore having\nbetter compatibility with the IEEE 802.11p standard than earlier distance-aware algorithms...
IPTV services are typically featured with a longer channel changing delay compared to the conventional TV systems. The major\ncontributor to this lies in the time spent on intraframe (I-frame) acquisition during channel changing. Currently, most widely\nadopted fast channel changing (FCC) methods rely on promptly transmitting to the client (conducting the channel changing)\na retained I-frame of the targeted channel as a separate unicasting stream. However, this I-frame acceleration mechanism has\nan inherent scalability problem due to the explosions of channel changing requests during commercial breaks. In this paper, we\npropose a fairness-based admission control (FAC) scheme for the original I-frame acceleration mechanism to enhance its scalability\nby decreasing the bandwidth demands. Based on the channel changing history of every client, the FAC scheme can intelligently\ndecide whether or not to conduct the I-frame acceleration for each channel change request. Comprehensive simulation experiments\ndemonstrate the potential of our proposed FACscheme to effectively optimize the scalability of the I-frame acceleration mechanism,\nparticularly in commercial breaks. Meanwhile, the FAC scheme only slightly increases the average channel changing delay by\ntemporarily disabling FCC (i.e., I-frame acceleration) for the clients who are addicted to frequent channel zapping....
Versatile Video Coding (VVC) introduces many new coding technologies, such as quadtree
with nested multi-type tree (QTMT), which greatly improves the efficiency of VVC coding. However,
its computational complexity is higher, which affects the application of VVC in real-time scenarios.
Aiming to solve the problem of the high complexity of VVC intra coding, we propose a low-complexity
partition algorithm based on edge features. Firstly, the Laplacian of Gaussian (LOG) operator was
used to extract the edges in the coding frame, and the edges were divided into vertical and horizontal
edges. Then, the coding unit (CU) was equally divided into four sub-blocks in the horizontal and
vertical directions to calculate the feature values of the horizontal and vertical edges, respectively.
Based on the feature values, we skipped unnecessary partition patterns in advance. Finally, for the
CUs without edges, we decided to terminate the partition process according to the depth information
of neighboring CUs. The experimental results show that compared with VTM-13.0, the proposed
algorithm can save 54.08% of the encoding time on average, and the BDBR (Bjøntegaard delta bit
rate) only increases by 1.61%....
This paper deals with radio resource allocation in fourth generation (4G) wireless mobile networks based on Orthogonal\r\nFrequency Division Multiple Access (OFDMA) as an access method. In IEEE 802.16m standard, a contiguous method for\r\nsubchannel construction is adopted in order to reduce OFDMA system complexity. In this context, we propose a new subchannel\r\ngain computation method depending on frequency responses dispersion. This method has a crucial role in the resource\r\nmanagement and optimization. In a single service access, we propose a dynamic resource allocation algorithm at the physical layer\r\naiming to maximize the cell data rate while ensuring fairness among users. In heterogeneous data traffics, we study scheduling in\r\norder to provide delay guaranties to real-time services, maximize throughput of non-real-time services while ensuring fairness to\r\nusers.We compare performances to recent existing algorithms in OFDMA systems showing that proposed schemes provide lower\r\ncomplexity, higher total system capacity, and fairness among users....
This paper introduces thorough comparative and interoperability analyses involving a
browser-based P2P video streaming approach utilizing WebRTC (web real-time communication),
along with WebRTC hybrid solutions developed using the React Native framework (for mobile) and
the electron framework (for desktop and Raspberry Pi). The assessment is carried out based on various
metrics, including CPU (central processing unit) load, RAM (random access memory) utilization, and
network data consumption. The obtained findings highlight the potential of integratingWebRTC P2P
video streaming into hybrid applications as a promising alternative for real-time video streaming
applications in embedded systems; given that, compared to the current mainstreams, e.g., Chrome or
Firefox, the proposed approach has superiority performance in terms of CPU load, RAM usage, and
network occupancy. The results also demonstrated that interoperability is ensured between the two
types of applications (web-based and hybrid-based one)....
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