TV Stop Motion Goggle SMG SMG 3 1) 2) 3) 1ms SMG SMG SMG 2. 3D 3D [3] Milgram [4] 4ms 3ms 7ms 1ms LED 1 Morphovision [5] 1,000 fps 60 fps 70,000 fps B

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1 Stop Motion Goggle 1,a) 2 2 1,3 2, , Stop Motion Goggle SMG SMG ms SMG Stop Motion Goggle: Augmented Visual Perception Using High Speed Liquid Crystal Naohisa Nagaya 1,a) Yuji Uema 2 Masahiro Furukawa 2 Maki Sugimoto 1,3 Masahiko Inami 2,4 Received: June 26, 2011, Accepted: January 13, 2012 Abstract: Stop Motion Goggle (SMG) expands visual perception by allowing user to perceive visual information selectively through a high speed shutter. In this system, user can easily observe not only periodic rotational motion such as rotating fans or wheels, but also random motion like a jumping ball. In this study, we developed SMG and evaluated the effect of SMG on visual perception of high speed moving objects. Furthermore this paper describes user s behaviors under the expanded visual experience. Keywords: high-speed shutter, visual perception, motion deblur 1 Media Design Research Institute, Graduate School of Media Design, Keio University, Yokohama, Kanagawa , Japan 2 Graduate School of Media Design, Keio University, Yokohama, Kanagawa , Japan 3 Department of Information and Computer Science, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa , Japan 4 ERATO Japan Science and Technology Agency ERATO, Chiyoda, Tokyo , Japan a) naohisa.nagaya@gmail.com 1. Real motion [1] [2] c 2012 Information Processing Society of Japan 1319

2 TV Stop Motion Goggle SMG SMG 3 1) 2) 3) 1ms SMG SMG SMG 2. 3D 3D [3] Milgram [4] 4ms 3ms 7ms 1ms LED 1 Morphovision [5] 1,000 fps 60 fps 70,000 fps Bellows [2] Morphovision c 2012 Information Processing Society of Japan 1320

3 3. Stop Motion Goggle Stop Motion Goggle SMG 1 SMG [6] SMG 10 ms 200 ms Visual persistence [7], [8] SMG SMG 4. SMG PC 4.1 SMG 2 Duty EEPROM PC 1 SMG Fig. 1 Concept sketch of SMG. 2 SMG Fig. 2 Block diagram and snapshot of SMG. c 2012 Information Processing Society of Japan 1321

4 4 FLC Fig. 4 Characteristics of FLC. 1 FLC Table 1 FLC Specifications data sheet. 3 FLC Fig. 3 Characteristics of FLC measurement system. Duty 4.2 Microchip PIC16F876 ±5V DC-DC SUW60515C 4.3 TN IPS FLC: Ferro-electric Liquid Crystal SMG Displaytech Micron 1 LV2500P-OEM 10% 90% 90% 10% 50 µs LV2500P-OEM +5 V 5V FLC 3 LED 0.02 Lux 4 10 Hz/Duty 1% 1ms 80 Hz/Duty 4% 0.5 ms 50 µs 150 µs 90% 250 µs 80 Hz Duty 2% 90% 100% 1.0 ms 5. SMG [9], [10] SMG c 2012 Information Processing Society of Japan 1322

5 5 Fig. 5 Accelerator unit. 6 Fig. 6 Experimental setup. SMG SMG DC RS-380PH-4045 PIC mm deg 2.5 m/s 200 deg/s deg/s 6mm FLC 2 LX2 2 FLC Table 2 Luminance status. 2 Duty m/s FLC 25 Hz 50 Hz 2 25 Hz ms 0.4 ms Duty % 1% 9 50 Hz ms 0.2 ms Duty % 1% FLC Hz 50 Hz 25 Hz 50 Hz 9 25 Hz 50 Hz c 2012 Information Processing Society of Japan 1323

6 10 Fig. 10 Appearances of Landolt rings Hz Fig. 7 Percentage of correct answers: 25 Hz Hz Fig. 8 Percentage of correct answers: 50 Hz. 9 Fig. 9 Percentage of correct answers: Each frequencies Hz 50 Hz 1.2 ms 25 Hz 50 Hz ms 4.0 ms 6. SMG c 2012 Information Processing Society of Japan 1324

7 11 SMG Fig. 11 Snapshot of the coin through SMG. 12 Fig. 12 Miniature night view. SMG 40 Hz 6.1 [12] SIGGRAPH SMG SMG Laval Virtual 2009 Ars Electronica Center [13] 12 [13] SMG 6.3 SMG SMG SMG SMG SMG 50 Hz 60 Hz SMG SMG c 2012 Information Processing Society of Japan 1325

8 7. SMG SMG SMG SMG 8. Stop Motion Goggle 25 Hz 50 Hz ms SMG [1] Edgerton, E.H. and Killian, R.J.: Flash!: Seeing the unseen by ultra high-speed photography, Hale, Cushman & Flint (1939). [2] Dyer, E.: Bellows: Bringing digital animation into the physical world, ACM SIGGRAPH 2008 New Tech Demos (2008). [3] Lipton, L. et al.: Achromatic liquid crystal shutter for stereoscopic and other applications, U.S. Patent (Dec. 5, 1989). [4] Translucent Technologies Inc., PLATO: Visual Occlusion Spectacles, available from plato.html (accessed ). [5] Fukaya, T., Iwai, T. and Yamanouchi, Y.: Morphovision, ACM SIGGRAPH 2006 Emerging Technologies (2006). [6] Watson, B.A. and Ahumada, J.A. Jr.: A look at motion in the frequency domain, NASA Technical Memorandum (1983). [7] Bowling, A., Lovegrove, W. and Mapperson, B.: The effect of spatial frequency and contrast on visual persistence, Perception, Vol.8, pp (1979). [8] Ueno, T.: Visible persistence: Effect of luminance, spatial frequency and orientation, Vision Research, Vol.23, pp (1983). [9] Takeuchi, T. and De Valois, K.K.: Sharpening image motion based on the spatio-temporal characteristics of human vision, Proc. SPIE, Vol.5666, pp (2005). [10] Ramachandran, V.S., Rao, V.M. and Vidyasagar, T.R.: Sharpness constancy during movement perception (Short note), Perception, Vol.3, pp (1974). [11] Miles, A.F., Kawano, K. and Optican, L.M.: Short latency ocular following responses of the monkey. I. Dependence on temporospatial properties of visual input, Journal of Neurophysiology, Vol.56, pp (1986). [12] Nagaya, N., Chuan Siang, F.F., Furukawa, M., Tokiwa, T., Sugimoto, M. and Inami, M.: Stop motion goggle, ACM SIGGRAPH 2008 New Tech Demos (2008). [13] Nagaya, N., Furukawa, M., Sugimoto, M. and Inami, M.: Surrounding of Firefly: Stop Motion Goggle for Luminary Objects, Laval Virtual 2009 (2009) DC c 2012 Information Processing Society of Japan 1326

9 DC PD VR 2008 Augmented Human Best Paper Award JST MIT IEEE Virtual Reality Best Paper Award ACM IEEE Computer Society c 2012 Information Processing Society of Japan 1327

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