• Journal of the Institute of Electronics Engineers of Korea SC
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• v.41 no.4
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• pp.45-54
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• 2004

In this paper, a view point tracking system has been realized for outdoor augmented reality including broad area monitoring. Since the surroundings of the moving view point are changing, it is necessary to track the position and observation moment of the view point system for consistency between real and virtual images. For this reason, the GPS(Global Positioning System) is applied to the realized system for tracking the information on position and direction of the moving system. In addition, an optical position tracking system that is able to track view point in a limited area is used, because the local tracking system has to trace the image variation, seen to the observer in a moving vehicle, at a particular position and time. It was found that the realized outdoor augmented reality system, which combined the virtual information tracked in real time with the real image, can be very practical in various application area.

• Journal of Cadastre & Land InformatiX
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• v.47 no.2
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• pp.39-47
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• 2017

The SAR payload of the KOMPSAT-5 is equipped with an X-band (9.66GHz) microwave-based sensor. Especially, since it has a fixed antenna that can be electronically steered with respect to the azimuth and elevation planes, various applications are expected. This study evaluates the production performance and the accuracy of the DEM by producing DEM using the HR and UH mode images of KOMPSAT-5. To evaluate the production performance of the DEM, the sensitivity of DEM was assessed through a baseline analysis and $2{\pi}$ ambiguity; it was found to have good production performance. In addition, to evaluate the accuracy of the produced DEM, 30 check points were compared with SRTM data. As a result, STDEV ${\pm}15-20m$ accuracy was obtained. If the accuracy of the DEM is improved by adjusting the parameters of the filtering method or phase unwrapping method in the future, it will be possible to widely use the KOMPSAT-5 image for environmental and disaster monitoring.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.1137-1140
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• 2019

가상현실(Virtual Reality, VR), 증강현실(Augmented Reality, AR), 혼합현실(Mixed Reality, MR) 분야에 유용한 인간 컴퓨터 인터페이스 기술은 필수적이다. 특히 휴먼 손동작 인식 기술은 직관적인 상호작용을 가능하게 하여, 다양한 분야에서 편리한 컨트롤러로 사용할 수 있다. 본 연구에서는 뎁스 영상 기반의 1 인칭 시점 손동작 인식을 위하여 손동작 데이터베이스 생성 시스템을 구축하여, 손동작 인식기 학습에 필요한 1 인칭(Egocentric View Point) 데이터베이스를 촬영하여 제작한다. 그리고 모바일 Head Mounted Device(HMD) VR 을 위한 뎁스 영상 기반 1 인칭 시점 손동작 인식(Hand Pose Recognition, HPR) 딥러닝 Deep Residual Network 를 구현한다. 최종적으로, 안드로이드 모바일 디바이스에 학습된 Residual Network Regressor 를 이식하고 모바일 VR 에 실시간 손동작 인식 시스템을 구동하여, 모바일 VR 상 실시간 3D 손동작 인식을 가상 물체와의 상호작용을 통하여 확인 한다.

• The Journal of Bigdata
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• v.3 no.2
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• pp.113-121
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• 2018

In this study, an augmented reality(AR)-based information management system for agricultural facility is proposed. Using a variety of sensed data transmitted by Lora-based wireless networks deployed at the agricultural facility, this system is capable of augmenting the sensed data and displaying them on the user's smartphone screen to provide visualized information to user. When users point their smartphone camera to the agricultural facility, the environment information collected from numerous sensors installed at the facility would be visualized and appear on the screen. Unlike traditional system which requires user to search a specific facility and then select sensor(s) to obtain the environment information, the proposed system shows the information on smartphone screen by augmenting it with real image captured by camera without doing a series of time-taking selection process. Since the way of acquiring information is through image or video, this system contributes to convenient monitoring and efficient management for agricultural facility.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.249-251
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• 2012

Augmented Reality (AR) enables the enhanced realism and interaction by providing the overlaid digital information on the user's view of the physical world. In this paper, we propose an AR-based ship design visualization system for presenting ship 3D model in smart phones or table PCs. The proposed system compute corner points and feature points by contour finding method and harris corner detector, and build a ship-design drawing database. By using SURF algorithm, key feature points are extracted from ship-design drawing image which is obtained by mobile camera. Then ship-design drawing image is recognized by matching the feature points stored in DB and extracted key feature points. 3D ship structures are visualized by overlaying the ship-design drawing image on the smart phone or table PC's screen. Compared to conventional 2D ship-design, proposed system helps to easily understand the structures of the ship and reduce the business design period. Thus, Enhanced competitiveness of business is expected.

• Journal of Korea Multimedia Society
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• v.15 no.3
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• pp.323-335
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• 2012

In this paper, we propose an AR(augmented reality) system using user's bare hand based on computer vision. It is important for registering a virtual object on the real input image to detect and track correct feature points. The AR systems with markers are stable but they can not register the virtual object on an acquired image when the marker goes out of a range of the camera. There is a tendency to give users inconvenient environment which is limited to control a virtual object. On the other hand, our system detects fingertips as fiducial features using adaptive ellipse fitting method considering the geometric characteristics of hand. It registers the virtual object stably by getting movement of fingertips with determining the shortest distance from a palm center. We verified that the accuracy of fingertip detection over 82.0% and fingertip ordering and tracking have just 1.8% and 2.0% errors for each step. We proved that this system can replace the marker system by tacking a camera projection matrix effectively in the view of stable augmentation of virtual object.

• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.41-46
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• 2008

디지털 기술의 발전은 인간 생활에 큰 변화를 가져다주었다. 이와 같은 디지털 기술의 발전으로 변화된 인간 생활 중 가장 큰 변화는 기술의 발전 이전에 사용되던 각종 제품 및 도구들이 디지털 기술의 힘으로 새롭게 재탄생하고 있다는 점이다. 재탄생된 제품 및 도구들은 사람과 제품간의 경계를 무너뜨리고 서로 융합되고 있다. 이러한 제품들 중에서 대표적으로 Digital Mirror를 들 수 있다. 기존 인간 생활에서 사용되던 일반적인 Mirror가 최근 들어 Digital Mirror라는 새로운 형태의 제품으로 연구되어 지고 있다. 이러한 Digital Mirror는 일상생활 속에서 기존 거울을 대체하고 있으며, 인터렉티브 미디어 아트에서도 많이 응용되고 있다. 현재 Digital Mirror는 광고, 인터렉티브 아트 등의 분야에서 다양한 형태의 콘텐츠가 개발되고 있다. 하지만 Digital Mirror를 새로운 제품 산업군으로 확대하여 신사업을 창출하기 위해서는 수많음 사용자들의 욕구를 충족시킬 수 있는 인터렉티브한 콘텐츠 제작을 해야 한다. 본 연구에서는 Digital Mirror의 인터렉티브한 콘텐츠 제작을 목적으로, 기존의 인터렉티브한 콘텐츠 사례를 중점적으로 연구하여 새로운 콘텐츠 아이디어를 도출하였다. 아이디어를 통해 어린이 사용자를 타켓으로 새로운 사용경험을 제공해 줄 수 있는 컨셉을 정하여 인기 애니메이션 캐릭터를 사실적으로 체험할 수 있게 해주는 콘텐츠 제작방향을 설정하여 연구를 진행하였다. 또한 놀이와 참여, 상호작용을 통한 새로운 디지털 놀이 도구라는 개념으로 AR기술을 이용해 캐릭터를 좀더 사실적으로 체험 할 수 있도록 제작하였다. 어린이 사용자가 캐릭터 마커를 착용하고 Digital Mirror앞에 서게 되면 캐릭터 마커에 해당되는 3차원 입체영상 애니메이션 캐릭터가 어린이 사용자의 모습과 합성되어 사실적인 캐릭터 콘텐츠를 체험 할 수 있게 해 주는 콘텐츠이다. 어린이들에게 인기 있는 캐릭터를 3D로 제작하여 캐릭터 소스로 활용하였고 이를 효율적으로 사용할 수 있도록 어플리케이션 저작툴을 개발 완료하여 제작하였다. 그리고 평판 디스플레이를 이용하여 실제 Prototype 제작하였다.

• The Journal of the Korea Contents Association
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• v.12 no.5
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• pp.70-80
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• 2012

The marine life culture contents added with fun and learning factors are created in a 3D space, and the development of augmented reality contents concerning marine life resources in islands and the utilization method of experience-based learning are proposed. As a WYSIWYG-based authoring tool, an augmented reality authoring tool was made to easily use a authoring tool through a node structure and drag & drop. Marine life contents add the animation effect through a marker and event factors such as the change of modeling data, and also, they support real experience-based learning with the narration of marine life. Based on around 50 species of marine animals augmented reality contents, a marine animal AR book can be utilized as a textbook for elementary school classes, and as a 3D image education utilizing augmented reality, it enhances a learning effect by allowing realistic observation, various ways of thinking, and the maximum flow.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.2
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• pp.439-445
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• 2012

IT convergence technology is gradually becoming anthropocentric and evolving based on the low-carbon green growth. Augmented reality technique is a contents convergence technology that can mix virtual objects while maintaining a sense of the real world. For that reason, interaction between user and system is possible, can make various applications, and has a high possibility for expandability. To expand the scope of existing interaction, this paper suggests contextual UX-based augmented reality system. It is a system which creates virtual objects that respond to the changes in the real world environment, and users can directly apply their personal preferences to virtual objects. Also, several virtual objects can be registered all at once, and even shows animations corresponding to either day and night according to the brightness of illumination. As said, it improves user's satisfaction through a system of mixed usability, and leads to a continuous use of augmented reality contents.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.24 no.2
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• pp.381-390
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• 1994

The purpose of this study was to determine whether any similarity existed in craniofacial morphology between parents and offspring in cleft lip with or without cleft palate. Thirty three measurements of the various regions of cranium and face were obtained from lateral cephalometric radiograms in 28 families comprising 28 fathers, 28 mothers and 28 cleft patients. The measurements of cleft patients were compared with those of their fathers, mothers and midparents. The obtained results were as follows: 1. There were similar measurements between the cleft patients and their fathers; rama1 height(Ar-Go), mandibular angle(∠MP-RP). 2. There were similar measurements between the cleft patients and their mothers; cranial base angle(∠NSBa), relation of maxilla to the cranial base(∠SNA), relation of maxilla to the cranial base(soft tissue:∠BaN'Sn), angle of inferior border of mandible(∠SNL-MP) and convexity of nose apex(soft tissue:∠N'PmPog'). 3. There were similar measurements between the cleft patients and their midparents; ramal height (Ar-Go), cranial base angle( ∠NSBa), relation of maxilla to the cranial base(soft tissue: ∠BaN'Sn), Y axis angle(∠NSGn) and mandibular angle(∠MP-RP). 4. There was no similar measurements between the cleft patients and their fathers and mothers simultaneously.