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    지도교수 방현우
    전공분류 기타(ETC),
    주소 서울특별시 관악구 관악로 1 301동 1204호
    전화 02-880-1722
    홈페이지 http://newmedia.snu.ac.kr/wp/

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    이 실험실은 서울대학교 방현우 교수님의 뉴미디어 연구실입니다.

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    Virtual Mouse with Visual Field Compatibility - Jungman Chung, Chaehyeok Lim, Byungjoo Lee
    In recent years, there have been some experimental studies of the computer mouse to augment its functionalities. The virtual mouse is one of those attempts got rid of its physical hardware. It uses IR emitter and IR camera instead to detect the user’s hand and interpret its relative motion as the cursor movement on the computer screen. For its vision-based interaction, the virtual mouse provides more flexible and novel user experiences like multi-touch or gestural interactions without any supports of additional hardware in user’s hand. Such studies of the virtual mouse, however, have not considered the visual field compatibility at all. The visual field compatibility is the compatibility that matches the direction of motion of the input device to the direction of the cursor on user’s virtual visual field, not on the computer screen. Worringham C.J. and Beringer D.B.’s study represents that the visual field compatible input device has shorter movement time and fewer errors than those of incompatible one. In this study, we present the visual field compatible virtual mouse and compare its performance with that of incompatible one. The left figure shows the prototype system which is composed of the depth sensing camera mounted on the top of the screen and the direction of the hand to provide the system with the visual field compatibility.
     
    A Kinematic Analysis of Directional Effects on Mouse Control - Byungjoo Lee
    To increase the usability of computer mouse, it is essential to understand the factors affect the cursor movement. In that regard, the directional effects associated with cursor movement of computer mouse have long been researched. Most such researches, however, have not considered the kinematic variables of the cursor trajectory and only considered the movement time and error rate as dependent measure. And the number of levels for angle factor was too small that can’t fully reveal the singular features of cursor movement in the horizontal direction originated from the bio-mechanical factor of hand-wrist system. The present study investigated the directional effects on kinematic variables when using a mouse to select circular targets presented on a computer display screen. The experiment was designed on the ISO 9241 standard and used 16 levels for angle factor to investigate the singular feature of cursor movement in the horizontal direction.
     
    Microscopic Augmented Reality for a Long-Term Live-Cell Imaging - Kyungwon Yun, Jungman Chung
    Long-term, time-lapsed cell imaging is one of the inevitable process of monitoring cell fate and development in biology and life science. Without relatively expensive equipments like stage encoder or built-in incubator microscope, however, the process of re-locating the region of interest (ROI) would in general become troublesome work. Thus it is necessary to develop an inexpensive, efficient way to relocating the ROI during imaging, especially for lab automation. In this study, we present a method for engineering microscale augmented reality indicators (ARIs) for enhanced ROI relocation. To accomplish the process of relocation, microscale ARIs were designed and printed in a film format. In addition, the position and rotation information of the indicator can be programmed and analyzed by an open-source algorithm which can recognize all the patterns from acquired image data. In our experiments, HeLa cell line was used to validate the performance of the proposed method for real-time monitoring cell culture. The results show that with focusing the ARIs during location finding time (using computer vision based pattern recognition), then focusing the specimen only during investigation, ARIs can provide accurate, convenient, inexpensive way to relocate the ROI without using any other additional equipment.

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