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1 Vol. 50 No (Jan. 2009) TalkCast TalkCast TalkCast: Creating and Playing Video-contents for Mobile Learning Takuya Kajiyama, 1 Hiroshi Sagehashi, 1 Toshiya Fukui 1 and Satoshi Ichimura 1 Although lectures and seminars using presentation software became popular, a chalk-talk is still commonly used among education institutions such as schools and universities. Learning-style using mobile devices such as a portable movie player and gaming console on a commuter s train has got quite popular these days because modern people, who are busy at work, sometimes have no time to study at workplace or at home. We developed TalkCast, a mobile learning system which allows content creators to easily generate interactive video contents from recorded chalk-talk lecture, and lets people download the contents from the Internet as Podcast. And we developed a movie-player that can play the Podcast contents on mobile devices. This player can play the lecture-video, and show blackboard images in which lecture s appearance is deleted. In this paper, the outline of the system, implementation, and the evaluation issues are described. 1. E- PC ChalkTalk 1),2) TOEIC 3) ipod 4),5) PSP R PlayStation R Portable 1 TalkCast TalkCast Chalk- Talk PSP R PSP R 1 Tokyo University of Technology 1 PlayStation PSP 383 c 2009 Information Processing Society of Japan

ChalkTalk E- 7) 10) 8) Web 9) Windows Media Player 10) PC ipod 11) 14) PDA 15)

2 384 TalkCast 2. ChalkTalk HDV 1 Web ChalkTalk OSCJ OpenSource Collaboration Joint Network 6) ChalkTalk E- 7) 10) 8) Web 9) Windows Media Player 10) PC ipod 11) 14) PDA 15) 17) ipod 11) 12) ipod Web itunes ipod 1 Fig. 1 Recorded whole blackboard area. 2 Fig. 2 Recorded lecture s area. PC (1) 1 (2) 2 15) Web Web 16) PC

385 TalkCast PDA TOEIC 3. TalkCast 1 ChalkTalk TalkCast 3 5 3 (1) TalkCast Producer 3 TalkCast Fig. 3 Outline of TalkCast system.

3 385 TalkCast PDA TOEIC 3. TalkCast 1 ChalkTalk TalkCast (1) TalkCast Producer 3 TalkCast Fig. 3 Outline of TalkCast system. PC TalkCast Slide Mixer PC (2) TalkCast Manager Web RSS TalkCast PC TalkCast Tuner for PSP R Web USB PSP R PC (3) TalkCast Player for PSP R PSP R PSP R TalkCast

386 TalkCast 1 PC MPEG2-TS Producer PowerPoint Slide Mixer Manager TalkCast Tuner TalkCast RSS PSP R PC wxwidgets Windows OS PDA PC PSP R 18),19) 4.

4 386 TalkCast 1 PC MPEG2-TS Producer PowerPoint Slide Mixer Manager TalkCast Tuner TalkCast RSS PSP R PC wxwidgets Windows OS PDA PC PSP R 18),19) TalkCast Producer Producer 1 HSV (1) (2) 1 Sony Handycam - HDR-HC1 4 TalkCast Producer Fig. 4 Processing in TalkCast Producer. H.264/MPEG4 AVC mpeg2 1/20 Player 1) 2) Producer ChalkTalk ipod PSP R PSP R TalkCast Producer TalkCast Slide Mixer Slide Mixer PowerPoint 5

PowerPoint Windows OLE A & & Player B C & D Slide Mixer & 6 Slide

5 387 TalkCast 5 Fig. 5 Example of questions. Player PSP R 6 PowerPoint Slide Mixer Slide Mixer PowerPoint PowerPoint Windows OLE A & & Player B C & D Slide Mixer & 6 Slide Mixer Fig. 6 Slide Mixer. 7 SlideMixer Fig. 7 Module of SlideMixer SlideMixer PowerPoint X-Y

6 388 TalkCast 8 Fig. 8 File of interactive data. 8 5 N (1) Qn n =1 (2) ms (3) (4) (5) Cn n =1 (6) X 1 1 (7) Y 1 1 (8) NEXT (9) (10) BACK Player SlideMixer PC Adobe Flash Flash PC Flash Player 5 TalkCast SlideMixer 2 5 PowerPoint Flash 15 SlideMixer Flash Flash & ActionScript 1 7 ActionScript ActionScript 1 1 Flash 1/10 T P = % SlideMixer & Flash 1 Flash

7 389 TalkCast 1 Table 1 Needed time. 9 Fig. 9 Mode of the lecture s video. SlideMixer 5. TalkCast Player for PSP R 5.1 TalkCast Player PSP R PSP R 2 Player 10 Fig. 10 Mode of whole blackboard

13 Module of Player. Producer SlideMixer 5.

8 390 TalkCast Fig Mode of enlarged blackboard. 13 Player Fig. 13 Module of Player. Producer SlideMixer (1) 12 Fig. 12 Mode of the question Player Player (2) C 3

9 391 TalkCast 3 Table 3 Optimal vertical moving range. 14 Fig. 14 Outside display area. 2 Table 2 Vertical moving range. 4 Table 4 Horizontal moving speed. D C D Table 5 Optimal horizontal moving speed.

10 392 TalkCast 20) ipod Talk- Cast PSP R 6. PSP R LMS Web 1) Chalk- Talk Vol.47, No.3, pp (2006). 2) Web Vol.47, No.10, pp (2006). 3) p ) Apple Inc.: News Release. 5) 6) OSCJ.net: chalktalk-project. 7) No.70, pp (2003). 8) D-I Vol.J83-D-1, No.11, pp (2000). 9) Liu, Q., Rui, Y., Gupta, A. and Cadiz, J.: Automating Camera Management for Lecture Room Environments, Proc. ACM Conference on Human Factors in Computing System (CHI 2001 ), Vol.3, pp (2001). 10) Zhang, C., Crawford, J., Rui, Y. and He, L.: An Automated End-to-End Lecture Capturing and Broadcasting System, Proc. ACM Multimedia 05, pp (2005). 11) UTOpenCourseWare Podcast. 12) Chandra, S.: Lecture video capture for the masses, Proc. ACM ITiCSE 07, pp (2007). 13) Hurst, W., Welte, M. and Jung, S.: An evaluation of the mobile usage of e-lecture podcasts, Proc. ACM Mobility 07, pp (2007). 14) Malan, D.J.: Podcasting computer science E-1, Proc. ACM SIGCSE 07, pp (2007). 15) 16) u-learning Vol.2, No.2, pp (2006). 17) Buyukkokten, O., Garcia-Molina, H., Paepcke, A. and Winograd, T.: Power browser: Efficient Web browsing for PDAs, Proc. ACM CHI 2000, pp (2000). 18) 19) pdf 20) Lee, K.B. and Grice, R.A.: An adaptive viewing application for the web on personal digital assistants, Proc. ACM SIGDOC 03, pp (2003). ( ) ( )

11 393 TalkCast Linux FXPAL IT TEXT Web IT TEXT Web DICOMO 2003 & DICOMO 2005 ACM

1 Web [2] Web [3] [4] [5], [6] [7] [8] S.W. [9] 3. MeetingShelf Web MeetingShelf MeetingShelf (1) (2) (3) (4) (5) Web MeetingShelf

1 Web [2] Web [3] [4] [5], [6] [7] [8] S.W. [9] 3. MeetingShelf Web MeetingShelf MeetingShelf (1) (2) (3) (4) (5) Web MeetingShelf 1,a) 2,b) 4,c) 3,d) 4,e) Web A Review Supporting System for Whiteboard Logging Movies Based on Notes Timeline Taniguchi Yoshihide 1,a) Horiguchi Satoshi 2,b) Inoue Akifumi 4,c) Igaki Hiroshi 3,d) Hoshi