• 대한원격탐사학회지
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• 제22권5호
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• pp.351-356
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• 2006

Based on current practical needs for geo-spatial information on mobile platform, the main theme of this study is a design and implementation of dynamic 3D terrain rendering system using spaceborne imagery, as a kind of texture image for photo-realistic 3D scene generation on mobile environment. Image processing and 3D graphic techniques and algorithms, such as TIN-based vertex generation with regular spacing elevation data for generating 3D terrain surface, image tiling and image-vertex texturing in order to resolve limited resource of mobile devices, were applied and implemented by using graphic pipeline of OpenGL|ES (Embedded System) API. Through this implementation and its tested results with actual data sets of DEM and satellite imagery, we demonstrated the realizable possibility and adaptation of complex typed and large sized 3D geo-spatial information in mobile devices. This prototype system can be used to mobile 3D applications with DEM and satellite imagery in near future.

• 로봇학회논문지
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• 제4권1호
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• pp.74-80
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• 2009

This paper presents a remote monitoring and simulation system for a building cleaning mobile robot. It provides a tool of convenient 3D graphical map construction including network camera image viewer and status information of the robot. The 3D map is reconstructed from existing 2D building CAD data with DXF format using OpenGL graphic API. Through this system, it is possible to monitor and control the cleaning mobile robot from remote place. A practical experiment is performed to show the reliability and convenience of the monitoring system. The proposed system is expected to give efficient way of control and monitoring to building cleaning mobile robot.

• 한국멀티미디어학회논문지
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• 제22권8호
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• pp.897-912
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• 2019

The growth of domestic fashion industry market went sluggish affected by long-term slow growth and shrinking consumer sentiment since 2012, and the entire market has shown a slight growth since 2017. Yet only some conglomerates or global businesses experience this growth. Small and medium-sized fashion companies or rising fashion designers in South Korea, face real limitations and problems poor capital, lack of professional workforce, experience, information and educational opportunity as well as difficulty of acquiring distribution network, which lead to further polarization between conglomerates and small businesses. Thus, this study proposed mobile virtual viewer system-based collaborative application prototype capable of overcoming limitations and problems drawn by analyzing business environment of domestic brands launched by rising fashion designers. Especially, through applied template-based 3D virtual fashion design technology and performing the entire process in the virtual reality beyond spatial and temporal restraints, it is assumed that more effective and efficient outcomes can be obtained compared to the previous method.

• 한국CDE학회논문집
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• 제18권4호
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• pp.258-266
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• 2013

In shipbuilding, 2D manufacturing drawings are crucial for building a ship. Even various types of 3D models are being utilized for supporting ship manufacturing, which does not reduce the importance of 2D drawings. Recently things are changing in the shipbuilding industry. To reduce the number of 2D drawings or to reduce the quantity of information contained in 2D drawings, some attempts that can substitute for 2D drawings are being made. One of the attempts is to visualize lightweight 3D manufacturing models in a mobile device. In this paper, a method for displaying lightweight 3D models of a ship in an Android based device is introduced. To overcome the problem with parsing JT files in Android system, JT files are parsed in a Windows based server and as-simple-as-possible visualization data are transmitted to an Android based viewer. A comparison result with a commercial system is also given.

• 한국CDE학회논문집
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• 제12권6호
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• pp.413-421
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• 2007

3D rendering is becoming a common feature of mobile application programs with the rapid advance of mobile devices. Since the existing rendering engines do not provide triangulation functions, mobile 3D programs have focused on an efficient handling with pre-tessellated geometry. In addition, triangulation is comparatively expensive in computation, so it seems that the triangulation cannot be easily implemented on mobile devices with limited resources. Triangulation of 3D geometry is the essential process of visualization of 3D model data and many different triangulation methods have been reported. We developed a light and fast visualization process that involves constrained triangulation based on Voronoi diagram and applied it to a mobile computer application. In this paper, we applied kd-tree to the original incremental construction algorithm and produced new O(nlogn) incremental construction algorithm. And we show a simple and efficient constrained triangulation method based on Voronoi diagram. This paper also describes an implementation of mobile STEP data viewer as an application of our proposed algorithms.

• Journal of Information Processing Systems
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• 제12권4호
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• pp.612-630
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• 2016

As mobile augmented reality technologies are spreading these days, many users want to produce augmented reality (AR) contents what they need by themselves. To keep pace with such needs, we have developed a mobile AR contents builder (hereafter referred to as MARB) that enables the user to easily connect a natural marker and a virtual object with various interaction events that are used to manipulate the virtual object in a mobile environment so that users can simply produce an AR content using natural photos and virtual objects that they select. MARB consists of five major modules-target manger, virtual object manager, AR accessory manager, AR content manager, and AR viewer. The target manager, virtual object manager and AR accessory manager register and manage natural target markers, various virtual objects and content accessories (such as various decorating images), respectively. The AR content manger defines a connection between a target and a virtual object with enabling various interactions for the desired functions such as translation/rotation/scaling of the virtual object, playing of a music, etc. AR viewer augments various virtual objects (such as 2D images, 3D models and video clips) on the pertinent target. MARB has been developed in a mobile application (app) format in order to create AR contents simply using mobile smart devices without switching to a PC environment for authoring the content. In this paper, we present the detail organizations and applications of MARB. It is expected that MARB will enable ordinary users to produce diverse mobile AR contents for various purposes with ease and contribute to expanding the mobile AR market based on spread of a variety of AR contents.

• 한국컴퓨터그래픽스학회논문지
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• 제19권1호
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• pp.11-20
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• 2013

본 논문에서는 메모리, 전원, 화면 크기 등 자원이 제한적인 모바일 시스템에 적합한 대용량 3차원 메쉬 사용자 인터페이스를 소개하고자 한다. 대용량 3차원 메쉬는 분할과 다중해상도 간소화률 실시하여 한 개의 대용량 메쉬를 다수의 작은 데이터 집합으로 재구성하여 컴퓨터 서버에 저장한다. 사용자는 모바일 시스템에서 작은 팝업 창 3차원 미리 보기를 통해 원하는 3차원 메쉬를 선택 할 수 있고 전체화면에서 다중해상도 간소화 메쉬로 관찰 할 수 있다. 간소화 해상도는 멀티 탭 터치 상호작용을 통해 자동조절된다. 또한 더블 탭 터치로 대용량 메쉬의 정교한 원형 부분도 자세히 관찰 할 수 있다. 이러한 계층적인 인터페이스를 통해 모바일 시스템 자원 사용은 최소화하고 사용자와 실시간 상호작용을 통해 대용량 3차원 메쉬의 검색 및 디스플레이가 가능하도록 하였다. 본사용자 인터페이스를 구현한 모바일 3차원 뷰어와 앱 등을 제시하여, 본 인터페이스의 유용성을 보이고자 한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 춘계학술대회 논문집
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• pp.53-54
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• 2008

• 제어로봇시스템학회논문지
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• 제18권1호
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• pp.7-12
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• 2012

In this paper, we present an effective viewpoint estimation algorithm for the Moving parallax barrier method of 3D display mobile device. Moving parallax barrier is designed to overcome the biggest problem, the limited view angle. To accomplish it, the position of the viewer's eyes or face should be estimated with strong stability and no latency. We focus on these requirements in the poor performance of mobile processors. We used a pre-processing algorithm in order to overcome the various illumination changes. And, we combined the conventional Viola-Jones face detection method and Optical-flow algorithm for robust and stable viewpoint estimation. Various computer simulations prove the effectiveness of the proposed method.

• 한국항해항만학회지
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• 제40권6호
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• pp.369-374
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• 2016

최근 스마트 컴퓨팅 기술(IEEE, 2016)의 급격한 발달에 따라 3차원 항해시스템에 대한 연구가 활발해지고 있으며, 이를 적용한 상용 3차원 항해 시스템 및 3D VTS 시스템이 등장하고 있다. 비록 3차원 기술이 널리 알려지고 사용되고 있다 하더라도, 베일에 쌓인 숨겨진 코드에 대한 내용은 밝혀진 바가 없다. 본 연구의 목적은 S-52 전자해도 표현 표준을 만족할 수 있도록, 3차원 디스플레이 환경 하에서 전자해도 객체를 표현하는 기초적인 접근 방법을 보이는 것이다. 향후에 스마트폰 및 패드와 같은 모바일 기기에서도 사용하고, 웹기반의 선박관제시스템에도 사용할 수 있도록 OpenGL ES를 이용하여 3D ENC Viewer를 개발하였다. 특히 면객체 삼각화(area object triangulation), 텍스처 매핑에 의한 복합선 표현, 폴리곤 패턴 채우기, 심볼 작도 등에 대해 자세히 설명한다. 삼각화된 공간정보를 포함하는 시스템전자해도(System ENC)의 파일크기와 디스플레이 속도의 상관관계를 검토하여 성능을 검증하였다.