Current Issue : October - December Volume : 2018 Issue Number : 4 Articles : 5 Articles
An emerging requirement in multimedia applications over the Internet is the provisioning\nof synchronized play out of multimedia streams on all the ultimate receivers. Most multimedia\napplications use real-time transport protocol/real-time control protocol (RTP/RTCP) to transport\nmultimedia data over the internet. Internet Protocol (IP) network incurs a loss and/or delay of\nmedia packets resulting in distortions at receivers that can be perceived by the user. These distortions\nneed to be removed before data is presented to the end user. To handle such issues inter-stream\nand intra-stream synchronization algorithms were developed by the researcher using RTP/RTCP\nprotocols. These schemes could not work under multicasting environment properly. In this paper,\nwe have presented an algorithm based on RTP/RTCP protocol that achieved synchronized playout\nof multimedia data under multicasting environment. The proposed scheme offers a modification in\nRTCP and usage of the Network Time Protocol (NTP) as a source of the common clock to achieve\nsynchronized playout of multimedia data on multiple devices at the same time. We have implemented\nand tested our algorithm in Ericson Research Corporate Unit, Lulea, Sweden. Implementation results\nshow that the proposed algorithm delivered accurately synchronized playout of multimedia data\nunder all the possible scenarios defined in the experimental setup...
As smartphones, tablet computers, and other mobile devices have continued to dominate our digital world ecosystem, there are\nmany industries using mobile or wearable devices to perform Augmented Reality (AR) functions in their workplaces in order to\nincrease productivity and decrease unnecessaryworkloads.Mobile-based AR can basically be divided into three main types: phonebased\nAR, wearable AR, and projector-based AR.Among these, projector-basedAR or SpatialAugmented Reality (SAR) is themost\nimmature and least recognized type of AR for end users. This is because there are a small number of commercial products providing\nprojector-based AR functionalities in amobile manner. Also, prices ofmobile projectors are still relatively high.Moreover, there are\nstill many technical problems regarding projector-based AR that have been left unsolved.Nevertheless, it is projector-based AR that\nhas potential to solve a fundamental problem shared by most mobile-based AR systems. Also the always-visible nature of projectorbased\nAR is one good answer for solving current user experience issues of phone-based AR and wearable AR systems.Hence, in this\npaper, we analyze what are the user experience issues and technical issues regarding common mobile-based AR systems, recently\nwidespread phone-based ARsystems, and risingwearableARsystems.Thenfor each issue,we propose and explain a newsolution of\nhow using projector-based AR can solve the problems and/or help enhance its user experiences. Our proposed framework includes\nhardware designs and architectures as well as a software computing paradigm towards mobile projector-based AR systems. The\nproposed design is evaluated by three experts using qualitative and semiquantitative research approaches....
Interacting with digital contents in 3D is an\nessential task in various applications such as modeling\npackages, gaming, virtual reality, etc. Traditional\ninterfaces using keyboard and mouse or trackball\nusually require a non-trivial amount of working space\nas well as a learning process. We present the design\nof EZ-Manipulator, a new 3D manipulation interface\nusing smartphones that supports mobile, fast, and\nambiguity-free interaction with 3D objects. Our system\nleverages the built-in multi-touch input and gyroscope\nsensor of smartphones to achieve 9 degrees-of-freedom\naxis-constrained manipulation and free-form rotation.\nUsing EZ-Manipulator to manipulate objects in 3D is\neasy. The user merely has to perform intuitive singleor\ntwo-finger gestures and rotate the hand-held device\nto perform manipulations at fine-grained and coarse\nlevels respectively.We further investigate the ambiguity\nin manipulation introduced by indirect manipulations\nusing a multi-touch interface, and propose a dynamic\nvirtual camera adjustment to effectively resolve the\nambiguity. A preliminary study shows that our system\nhas significant lower task completion time compared to\nconventional use of a keyboardââ?¬â??mouse interface, and\nprovides a positive user experience to both novices and\nexperts....
The evaluation of geometric accuracy of high-resolution satellite images (HRSIs) has been\nincreasingly recognized in recent years. The traditional approach is to verify each satellite individually.\nIt is difficult to directly compare the difference in their accuracy. In order to evaluate geometric accuracy\nfor multiple satellite images based on the same ground control benchmark, a reliable test field in Xianning\n(China) was utilized for geometric accuracy validation of HRSIs. Our research team has obtained multiple\nHRSIs in the Xianning test field, such as SPOT-6, Pleaides, ALOS, ZY-3 and TH-1. In addition, ground\ncontrol points (GCPs) were acquired with GPS by field surveying, which were used to select the significant\nfeature area on the images. We assess the orientation accuracy of the HRSIs with the single image and\nstereo models. Within this study, the geometrical performance of multiple HRSIs was analyzed in detail,\nand the results of orientation are shown and discussed. As a result, it is feasible and necessary to establish\nsuch a geometric verification field to evaluate the geometric quality of multiple HRSIs....
Current image coding standards provide limited support for privacy and security features. An exception is the JPSEC\nstandard, which defines security extensions in JPEG 2000 specifications (part 8). Notwithstanding this shortcoming,\nthe JPEG committee is currently defining a new JPEG Systems standard, which envisages privacy and security support\nacross JPEG family of standards. In this manuscript, the main philosophy of this emerging specification is outlined\nalong with typical use cases, main requirements as well as examples of potential technological solutions. The\nupcoming specification guarantees backward and forward compatibility with earlier standards and legacy\nimplementations. Finally, we illustrate the introduced framework by two applications targeting secure photo sharing\non social networks and IPR management in the GLAM sector....
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