Recent advances and future directions in multimedia and mobile computing
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Recent advances in pervasive computers, networks, telecommunication, and information technology, along with the proliferation of multimedia-capable mobile devices, such as laptops, portable media players, personal digital assistants, and cellular telephones, have stimulated the development of intelligent and pervasive multimedia applications in a ubiquitous environment. Due to constant changing environments, Mobile multimedia implies considerable challenges to operators, infrastructure builders in terms of ensuring fast, reliable services and accommodating the quick growing global customer needs. This special issue aims to foster the dissemination of high quality research in any new theory and technique and to present future directions regarding multimedia and mobile computing. This special issue welcomes papers focused on all topics ranging in the wide spectrum of multimedia and mobile computing with emphasis on theoretical aspects as well as practical frameworks and implementations. Overall, the special issue will outline the recent trends, major challenges, and perspectives related to multimedia and mobile computing.
We have received many manuscripts. Eleven manuscripts were finally selected for this special issue. Each manuscript selected was blindly reviewed by at least three reviewers consisting of guest editors and external reviewers. In the following section, we present a brief overview of each manuscript.
2 Related works
The first paper entitled “Implementation Strategies for Efficient Media Fragment Retrieval,” by Wim Van Lancker et al.  propose and evaluate a number of implementation strategies for W3C Media Fragments URIs, which enable people to identify, share, link, and consume media fragments in a standardized way. Additionally, two optimized implementation strategies are introduced: a Media Fragment Translation Service allowing to keep existing Web infrastructure and a fully integrated Media Fragments URI server that is independent of underlying media formats.
The second paper entitled “A Middleware for a Tabletop Procedure-aware Information Display,” by Kaori Fujinami et al.  proposes a technique to project information near a tabletop object based on a current phase in a procedure and a middleware that allows a developer to focus on editing a set of presentation rules. The middleware is then evaluated through the developments of two application scenarios.
Another paper in this special issue, entitled “User-Selectable Interactive Recommendation System in Mobile Environment,” by Jung-Min Oh et al.  present a user-selectable recommendation system which considers user’s information preferences and demographics by employing collaborative filtering in a mobile environment. The goal of the paper is to provide more interactive recommendation system by adapting the optional filter for search results, and to show the prototype of flexible list of recommendation by selected option based on iPhone and Android phone environment. The cases by selected options are fifteen depend on the user’s similar group. The performance parameter considered in the analysis is the Mean Absolute Error to evaluate the user-selectable recommendation system.
The fourth paper entitled “Intelligent Video Surveillance System: 3-tier context-aware surveillance system with metadata,” by Yunyoung Nam et al.  presented an intelligent video surveillance system with the metadata rule for the exchange of analyzed information that consists of low-level context-aware, high-level context-aware and intelligent services to generate metadata for the surveillance systems. The system provides intelligent services to track moving objects in Fields Of View (FOVs) and to recognize human activities. Also, the system supports real-time moving objects tracking with Panning, Tilting and Zooming (PTZ) cameras in overlapping and non-overlapping FOV.
The fifth paper entitled “Investigating the Influence of QoS on Personal Evaluation Behaviour in a Mobile Context,” by Toon De Pessemier et al.  is based on user feedback evaluating the content to calculate personal suggestions for the end-user. Personal preferences regarding the content are extracted from this user feedback, thereby creating user profiles. This research proves that the user feedback regarding the content might be influenced by the audiovisual quality and QoS of mobile video. As a result, recommender systems may generate less accurate recommendations if the QoS is variable. This paper proposes a model for correcting the user feedback by taking the audiovisual quality and QoS of the content into account during the recommendation process.
Next paper entitled “Performance of TZCD-MBOK Watermarking Scheme in T-DMB Systems,” by Jung Nam Bae et al.  deals with T-ZCD MBOK-based watermarking techniques used in disaster broadcasting in T-DMB systems and presents the usability of the proposed techniques by simulation.
The seventh paper entitled “Evaluating Two Implementations of the Component Responsible for Decoding Video and Audio in the Brazilian Digital TV Middleware,” by Tiago H. Trojahn et al.  investigates two Media Processing implementations using libVLC and Xine graphical libraries. Performance tests and results of both Media Processing implementations running in two different desktop architectures are discussed.
The eighth paper entitled “The Study on Content Based Multimedia Data Retrieval System,” by Yang-hoon Kim et al.  has dealt with content-based retrieval system. In this study, the content-based retrieval system was implemented using color features from the image database that stores a number of images, and a retrieval is performed when the image vector values obtained by applying this color features to numerical expression for RGB color composition are passed over to DBMS through ODBC. As a result of test, the result values showed a relatively superior result to Swain’s proposed method. Main feature of database used for the present thesis is the various background colors of the image. Even in case the objects in the image take the same shape, it can be processed into different images according to the background colors of the image. For further assignment, extracting more detailed color features requires a study on the technique of indexing color values separately for objects in the image and for background by separating the objects in the image from the background.
Another paper in this special issue, entitled “A Study on Block-based Recovery of Damaged Digital Forensic Evidence Image,” by Eun-Gyeom Jang et al.  focus on such limitations of the existing forensic tools and introduces a new scheme that can recover and protect the evidence images on the disk. Specifically, evidence images are divided into blocks; linkage relations between those blocks are formed; and a meta-block is applied to restore the damaged blocks. Blocks in the damaged areas detected using CRC information are subject to a multidimensional block operation for recovery of damaged blocks and protection for evidence image.
The tenth paper entitled “An intrinsic semantic framework for recognizing image objects,” by Nishat Ahmad et al.  proposes a new approach to find semantic meanings in visual object class structure, in line with the Gestalt laws of proximity. Micro level semantic structures are formed by line segments (arcs also approximated into line segments based on pixel deviation threshold) which are in close proximity. These structures are hierarchically combined till a semantic label can be assigned. The algorithm formulates semantic group structures, their inter-relations and represents these using a graph. Invariant geometrical properties of the groups and relations are used as vertex and edge labels. A graph model captures the inter class variability by analyzing the repetitiveness of structures and relations and uses it as a weighting factor for classification.
The last paper entitled “A Backup Path Routing for Guaranteeing Bandwidth in Mobile Ad hoc Networks for Multimedia Applications,” by Kilhung Lee  suggests a routing and restoring scheme in mobile wireless ad hoc networks. A primary and a backup data path is established in an on-demand manner. After detecting a failure, a repairing procedure starts and restores the original path. The service quality is considered when making and restoring a path, and simulation results show that the proposed scheme supports the required service quality for multimedia applications.
We wish to thank all the authors for their great work and for considering the Springer’s Multimedia Tools and Applications journal for submitting their papers. Special thanks go to the anonymous reviewers for their help and dedication in reviewing the papers and providing useful comments to the authors for their papers improvement. Special thanks to the EiC Professor Borko Furht for hosting this special issue in the prestigious Springer’s Multimedia Tools and Applications journal, and for their excellent supports. We hope that this special issue will represent a timely and significant reference for future researches.
- 1.Ahmad N, An Y, Park J (2011) An intrinsic semantic framework for recognizing image objects. Multimedia Tools and Applications (MTAP), Online Published, February 08 2011. (doi:10.1007/s11042-011-0739-8)
- 2.Bae JN, Kim JY, Kim G, Lee YT, Cha JS (2011) Performance of TZCD-MBOK Watermarking Scheme in T-DMB Systems. Multimedia Tools and Applications (MTAP), Online Published, February 16 2011. (doi:10.1007/s11042-011-0740-2)
- 3.De Pessemier T, De Moor K, Ketykó I, Joseph W, De Marez L, Martens L (2011) Investigating the Influence of QoS on Personal Evaluation Behaviour in a Mobile Context. Multimedia Tools and Applications (MTAP), Online Published, January 13 2011. (doi:10.1007/s11042-010-0712-y)
- 4.Fujinami K, Inagawa N, Nishijo K, Sokan A (2011) A Middleware for a Tabletop Procedure-aware Information Display. Multimedia Tools and Applications (MTAP), Online Published, February 22 2011. (doi:10.1007/s11042-011-0759-4)
- 5.Jang E-G, Koh B-S, Choi Y-R (2011) A Study on Block-based Recovery of Damaged Digital Forensic Evidence Image. Multimedia Tools and Applications (MTAP), Online Published, February 05 2011. (doi:10.1007/s11042-011-0738-9)
- 6.Kim Y-H, Kwon H-J, Kang J-G, Chang H (2011) The Study on Content Based Multimedia Data Retrieval System. Multimedia Tools and Applications (MTAP), Online Published, March 01 2011. (doi:10.1007/s11042-011-0758-5)
- 7.Lee K (2011) A Backup Path Routing for Guaranteeing Bandwidth in Mobile Ad hoc Networks for Multimedia Applications. Multimedia Tools and Applications (MTAP), Online Published, January 11 2011. (doi:10.1007/s11042-010-0699-4)
- 8.Nam Y, Rho S, Park JH (2010) Intelligent Video Surveillance System: 3-tier context-aware surveillance system with metadata. Multimedia Tools and Applications (MTAP), Online Published, December 22 2010. (doi:10.1007/s11042-010-0677-x)
- 9.Oh J-M, Moon NM (2011) User-Selectable Interactive Recommendation System in Mobile Environment. Multimedia Tools and Applications (MTAP), Online Published, February 08 2011. (doi:10.1007/s11042-011-0737-x)
- 10.Trojahn TH, Gonçalves JL, Mattos JCB, Agostini LV, Da Rosa LS (2011) Evaluating Two Implementations of the Component Responsible for Decoding Video and Audio in the Brazilian Digital TV Middleware. Multimedia Tools and Applications (MTAP), Online Published, February 16 2011. (doi:10.1007/s11042-011-0753-x)
- 11.Van Wim L, Van Deursen D, Mannens E, Van de Walle R (2011) “Implementation Strategies for Efficient Media Fragment Retrieval,” Multimedia Tools and Applications (MTAP), Online Published, March 26 2011. (doi:10.1007/s11042-011-0785-2)