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Michael G. Christel

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Michael G. Christel

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Publications by Michael G. Christel (bibliography)

» 2008 «

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Christel, Michael G. and Frisch, Michael H. (2008): Evaluating the contributions of video representation for a life oral history collection. In: JCDL08 Proceedings of the 8th ACM/IEEE-CS Joint Conference on Digital Libraries 2008. pp. 241-250. Available online

“A digital video library of over 900 hours of video and 18000 stories from The HistoryMakers is used to investigate the role of motion video for users of recorded life oral histories. Stories in the library are presented in one of two ways in two within-subjects experiments: either as audio accompanied by a single still photographic image per story, or as the same audio within a motion video of the interviewee speaking. Twenty-four participants given a treasure-hunt fact-finding task, i.e., very directed search, showed no significant preference for either the still or video treatment, and no difference in task performance. Fourteen participants in a second study worked on an exploratory task in the same within-subjects experimental framework, and showed a significant preference for video. For exploratory work, video has a positive effect on user satisfaction. Implications for use of video in collecting and accessing recorded life oral histories, in student assignments and more generally, are discussed, along with reflections on long term user studies to complement the ones presented here.”

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» 2007 «

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Christel, Michael G. (2007): Establishing the utility of non-text search for news video retrieval with real world users. In: Lienhart, Rainer, Prasad, Anand R., Hanjalic, Alan, Choi, Sunghyun, Bailey, Brian P. and Sebe, Nicu (eds.) Proceedings of the 15th International Conference on Multimedia 2007 September 24-29, 2007, Augsburg, Germany. pp. 707-716. Available online

» 2006 «

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Christel, Michael G. (2006): Windowing time in digital libraries. In: JCDL06: Proceedings of the 6th ACM/IEEE-CS Joint Conference on Digital Libraries 2006. pp. 190-191. Available online

“This paper discusses the specification, organization, and utility of time references identified in digital library materials, emphasizing how to treat date references that cannot be resolved to a single day. The HistoryMakers oral history archive is used to illustrate the concept of windowing such time in digital library interfaces.”

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» 2005 «

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Christel, Michael G. and Conescu, Ronald M. (2005): Addressing the challenge of visual information access from digital image and video libraries. In: JCDL05: Proceedings of the 5th ACM/IEEE-CS Joint Conference on Digital Libraries 2005. pp. 69-78. Available online

“While it would seem that digital video libraries should benefit from access mechanisms directed to their visual contents, years of TREC Video Retrieval Evaluation (TRECVID) research have shown that text search against transcript narrative text provides almost all the retrieval capability, even with visually oriented generic topics. A within-subjects study involving 24 novice participants on TRECVID 2004 tasks again confirms this result. The study shows that satisfaction is greater and performance is significantly better on specific and generic information retrieval tasks from news broadcasts when transcripts are available for search. Additional runs with 7 expert users reveal different novice and expert interaction patterns with the video library interface, helping explain the novices' lack of success with image search and visual feature browsing for visual information needs. Analysis of TRECVID visual features well suited for particular tasks provides additional insights into the role of automated feature classification for digital image and video libraries.”

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Chen, Ming-yu, Christel, Michael G., Hauptmann, Alexander G. and Wactlar, Howard D. (2005): Putting active learning into multimedia applications: dynamic definition and refinement of concept classifiers. In: Zhang, Hongjiang, Chua, Tat-Seng, Steinmetz, Ralf, Kankanhalli, Mohan S. and Wilcox, Lynn (eds.) Proceedings of the 13th ACM International Conference on Multimedia November 6-11, 2005, Singapore. pp. 902-911. Available online

» 2004 «

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Christel, Michael G., Moraveji, Neema and Huang, Chang (2004): Evaluating content-based filters for image and video retrieval. In: Proceedings of the 27th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval 2004. pp. 590-591. Available online

“This paper investigates the level of metadata accuracy required for image filters to be valuable to users. Access to large digital image and video collections is hampered by ambiguous and incomplete metadata attributed to imagery. Though improvements are constantly made in the automatic derivation of semantic feature concepts such as indoor, outdoor, face, and cityscape, it is unclear how good these improvements should be and under what circumstances they are effective. This paper explores the relationship between metadata accuracy and effectiveness of retrieval using an amateur photo collection, documentary video, and news video. The accuracy of the feature classification is varied from performance typical of automated classifications today to ideal performance taken from manually generated truth data. Results establish an accuracy threshold at which semantic features can be useful, and empirically quantify the collection size when filtering first shows its effectiveness.”

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Christel, Michael G. and Moraveji, Neema (2004): Finding the right shots: assessing usability and performance of a digital video library interface. In: Schulzrinne, Henning, Dimitrova, Nevenka, Sasse, Martina Angela, Moon, Sue B. and Lienhart, Rainer (eds.) Proceedings of the 12th ACM International Conference on Multimedia October 10-16, 2004, New York, NY, USA. pp. 732-739. Available online

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Hauptmann, Alexander G. and Christel, Michael G. (2004): Successful approaches in the TREC video retrieval evaluations. In: Schulzrinne, Henning, Dimitrova, Nevenka, Sasse, Martina Angela, Moon, Sue B. and Lienhart, Rainer (eds.) Proceedings of the 12th ACM International Conference on Multimedia October 10-16, 2004, New York, NY, USA. pp. 668-675. Available online

» 2003 «

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Derthick, Mark, Christel, Michael G., Hauptmann, Alexander G. and Wactlar, Howard D. (2003): Constant Density Displays Using Diversity Sampling. In: InfoVis 2003 - 9th IEEE Symposium on Information Visualization 20-21 October, 2003, Seattle, WA, USA. . Available online

» 2002 «

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Hauptmann, Alexander G., Christel, Michael G. and Papernick, Norman D. (2002): Video retrieval with multiple image search strategies. In: JCDL02: Proceedings of the 2nd ACM/IEEE-CS Joint Conference on Digital Libraries 2002. p. 376. Available online

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Christel, Michael G., Cubilo, Pedro, Gunaratne, Junius, Jerome, William, O, Eun-Ju and Solanki, Sohini (2002): Evaluating a digital video library web interface. In: JCDL02: Proceedings of the 2nd ACM/IEEE-CS Joint Conference on Digital Libraries 2002. p. 389. Available online

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Christel, Michael G., Hauptmann, Alexander G., Wactlar, Howard D. and Ng, Tobun D. (2002): Collages as dynamic summaries for news video. In: ACM Multimedia 2002 2002. pp. 561-569. Available online

» 2001 «

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Christel, Michael G., Maher, Bryan and Begun, Andrew (2001): XSLT for Tailored Access to a Digtal Video Library. In: JCDL01: Proceedings of the 1st ACM/IEEE-CS Joint Conference on Digital Libraries 2001. pp. 290-299. Available online

“Surrogates, summaries, and visualizations have been developed and evaluated for accessing a digital video library containing thousands of documents and terabytes of data. These interfaces, formerly implemented within a monolithic stand-alone application, are being migrated to XML and XSLT for delivery through web browsers. The merits of these interfaces are presented, along with a discussion of the benefits in using W3C recommendations such as XML and XSLT for delivering tailored access to video over the web.”

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Palmer, C. R., Pesenti, J., Valdes-Perez, R. E., Christel, Michael G., Hauptmann, Alexander G., Ng, D. and Wactlar, H. D. (2001): Demonstration of Hierarchical Document Clustering of Digital Library Retrieval Results. In: JCDL01: Proceedings of the 1st ACM/IEEE-CS Joint Conference on Digital Libraries 2001. p. 451. Available online

“As digital libraries grow in size, querying their contents will become as frustrating as querying the web is now. One remedy is to hierarchically cluster the results that are returned by searching a digital library. We demonstrate the clustering of search results from Carnegie Mellon's Informedia database, a large video library that supports indexing and retrieval with automatically generated descriptors.”

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Christel, Michael G. and Huang, Chang (2001): SVG for navigating digital news video. In: ACM Multimedia 2001 2001. pp. 483-485. Available online

» 2000 «

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Wactlar, Howard D., Hauptmann, Alexander G., Christel, Michael G., Houghton, Ricky and Olligschlaeger, Andreas M. (2000): Complementary Video and Audio Analysis for Broadcast News Archives. In Communications of the ACM, 43 (2) pp. 42-47

» 1999 «

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Wactlar, Howard D., Christel, Michael G., Gong, Yihong and Hauptmann, Alexander G. (1999): Lessons Learned from Building a Terabyte Digital Video Library. In IEEE Computer, 32 (2) pp. 66-73

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Christel, Michael G. (1999): Visual digests for news video libraries. In: ACM Multimedia 1999 1999. pp. 303-311. Available online

» 1998 «

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Christel, Michael G., Smith, Michael A., Taylor, C. Roy and Winkler, David B. (1998): Evolving Video Skims into Useful Multimedia Abstractions. In: Karat, Clare-Marie, Lund, Arnold, Coutaz, Joëlle and Karat, John (eds.) Proceedings of the ACM CHI 98 Human Factors in Computing Systems Conference April 18-23, 1998, Los Angeles, California. pp. 171-178. Available online

“This paper reports two studies that measured the effects of different "video skim" techniques on comprehension, navigation, and user satisfaction. Video skims are compact, content-rich abstractions of longer videos, condensations that preserve frame rate while greatly reducing viewing time. Their characteristics depend on the image- and audio-processing techniques used to create them. Results from the initial study helped refine video skims, which were then reassessed in the second experiment. Significant benefits were found for skims built from audio sequences meeting certain criteria.”

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» 1997 «

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Christel, Michael G., Winkler, David B. and Taylor, C. Roy (1997): Multimedia Abstractions for a Digital Video Library. In: DL97: Proceedings of the 2nd ACM International Conference on Digital Libraries 1997. pp. 21-29. Available online

“Multimedia abstractions form essential components of digital video libraries because they enable a user to determine a video's distinguishing content without investing long viewing times or requiring high network-transfer speeds. This paper presents usage and evaluation data for abstractions implemented the Informedia Digital Video Library, and discusses implications for video delivery over the Web.”

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» 1995 «

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Smith, Michael A. and Christel, Michael G. (1995): Automating the Creation of a Digital Video Library. In: ACM Multimedia 1995 1995. pp. 357-358. Available online

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Christel, Michael G., Kanade, Takeo, Mauldin, M., Reddy, Raj, Sirbu, Marvin A., Stevens, Scott M. and Wactlar, Howard D. (1995): Informedia Digital Video Library. In Communications of the ACM, 38 (4) pp. 57-58

» 1994 «

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Stevens, Scott, Christel, Michael G. and Wactlar, Howard (1994): Infomedia: Improving Access to Digital Video. In Interactions, 1 (4) pp. 67-71

“The authors describe intelligent, automatic mechanisms for full-content search and retrieval from digital video, audio, and text libraries.”

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Christel, Michael G. (1994): The Role of Visual Fidelity in Computer-Based Instruction. In Human-Computer Interaction, 9 (2) pp. 183-223

“New digital video technologies provide a wide spectrum of multimedia interface capabilities for educational courses running on personal computers. A formal experiment was conducted using a digital video course on code inspection to determine the effects of such capabilities on recall performance and attitude. The findings suggest that the presentation of material as motion video rather than as a slide show within an interactive video course leads to better recall performance. In addition, the presence of motion video in the interfaces and the use of surrogate travel for navigation promote better student opinions toward the subject matter.”

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Changes to this page (author)

11 Feb 2010: Enabled abstracts to be shown on Michael G. Christel's author page.
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Publication statistics

Publication period:1994-2008
Publication count:24
Number of co-authors:35

Productive colleagues

Michael G. Christel's 3 most productive colleagues in number of publications:

Alexander G. Hauptmann:43
Yihong Gong:14
Takeo Kanade:13

Collaboration count

Number of publications with 3 favourite co-authors:

Alexander G. Hauptmann:8
Howard D. Wactlar:6
Neema Moraveji:2

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ETRA '10 - Eye Tracking Research & Applications Symp.

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Michael G. Christel

Publications by Michael G. Christel (bibliography)

» 2008 «

» 2007 «

» 2006 «

» 2005 «

» 2004 «

» 2003 «

» 2002 «

» 2001 «

» 2000 «

» 1999 «

» 1998 «

» 1997 «

» 1995 «

» 1994 «

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