• Journal of the Korea Computer Graphics Society
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• v.30 no.3
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• pp.133-140
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• 2024

Extended Reality (XR) is an immersive technology that combines the real and virtual worlds and is being actively researched across various industries. This study proposes a method for utilizing the Meta Quest 3, a head-mounted display (HMD) that provides mixed reality, outdoors for the first time by leveraging the GPS information from a smartphone. Augmented virtual objects are positioned using location information and the orientation. Additionally, by using the features of the Meta Quest 3, virtual objects are made to appear alongside the real world, allowing users to interact with virtual objects through hand gestures. This study aims to link present and past spaces by using location information and photographs on the HMD, providing a novel experience of freely traversing time and space.

• Journal of Computational Design and Engineering
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• v.2 no.1
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• pp.38-46
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• 2015

Augmented reality based on projection, called "Spatial Augmented Reality (SAR)", is a new technology that can produce immersive contents by overlapping virtuality and real-world environment. It has been paid attention as the next generation digital contents in media art and human-computer interaction (HCI). In this paper, we present a new methodology to evaluate the product appearance design more intuitively by means of SAR technique. The proposed method first projects the high-quality rendered image considering the optical property of materials onto the mock-up of a product. We also conduct a projector-camera calibration to compensate a color distortion according to a projector, a projection surface and environment lighting. The design evaluation methodology we propose offers more flexible and intuitive evaluation environment to a designer and user (evaluator) than previous methods that are performed via a digital display. At the end of this research, we have conducted a case study for designing and evaluating appearance design of an automobile.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.524-526
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• 2015

본 논문은 자유 시점조절과 깊이감 조절이 가능한 단일렌즈 양안시 3D 내시경과 Head-mounted display 를 사용한 새로운 로봇수술 시스템을 제안한다. 최근 들어서 여러 양안식 입체영상장치가 의료 영역에 적용되고 있다. 그러나 3D 의료 장비들은 zooming 과 자유로운 시점조절, 그리고 접사를 하는 데에 한계가 존재한다. 입체영상 장비에서 필연적으로 발생하는 이러한 문제점들은 3D 영화를 찍기 위해서 사용되는 것과 같은 2 대의 카메라와 2 개의 렌즈를 사용하는 데에서 원인을 찾을 수 있다. 이러한 문제점들은 Da Vinci 로봇 수술 시스템과 같은 가장 최신의 시스템에서도 해결되지 못하였다. 본 논문에서 제안하는 새로운 시스템은 지금까지 제시된 문제점들을 해결하고, 현재 존재하는 로봇 수술 시스템에 몰입 입체영상 수술이나 증강 현실 수술을 가능하게 하기 위한 목적으로 제안되었다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2021.06a
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• pp.67-69
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• 2021

인공 지능, 사물 인터넷, 클라우드 컴퓨팅, 빅데이터, 모바일을 중심으로 시작된 4차 산업혁명은 최근 메타버스(Metaverse)시대로 자연스럽게 확장되어 가고 있다. 메타버스 시대의 핵심 기술인 VR(Virtual Reality)/AR(Augmented Reality)/MR(Mixed Reality)과 이를 디스플레이 하기 위한 HMD(Head Mounted Display)나 글래스(glass) 장치들은 사용자에게 고품질 영상뿐만 아니라 3차원 공간에 대한 6DoF(Degrees of Freedom)급의 자유도를 제공해야 한다. 이에 발맞춰 MPEG에서는 최근 실사 및 CG(Computer Graphics)로 제작된 다시점 텍스쳐 및 깊이 영상에 대한 효과적인 압축 방법을 찾기 위한 MIV(MPEG Immersive Video) 표준화를 진행중이다. 본 논문은 최신 2차원 압축 표준인 VVC(Verstitle Video Coding)를 기반으로 MPEG MIV 1.0 표준 프레임워크를 검증해본다. 특히 높은 압축율에 비해 복잡도가 높은 VVC 표준의 특성을 고려하여 HHI에서 개발한 최적화 코덱인 VVenC를 이용하여 압축 효율과 복잡도 관점에서 MIV 표준 활용을 위한 최적의 솔루션을 찾고자 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.06a
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• pp.1241-1244
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• 2022

최근 K-Pop 을 위시한 예술공연 콘텐츠에 몰입형 미디어를 접목한 온택트 (Ontact) 미디어 스트리밍 서비스가 주목받고 있는 가운데, 본 논문은 일반적으로 사용되는 2D 디스플레이 또는 HMD (Head-Mounted Display) 기반 VR (Virtual Reality, VR) 서비스에서 탈피하여, 대형 가상현실 공연장을 위한 360 도 VR 비디오 스트리밍 시스템을 제안한다. 제안된 시스템은 Phase 1, 2, 3 의 연구개발 단계를 밟아 6DoF (Degrees of Freedom) 시점 자유도를 지원하는 360 도 VR 비디오 스트리밍 시스템을 개발하는 것을 최종목표로 하고 있으며, 현재는 Phase 1: 대형 가상현실 공연장을 위한 3DoF 360 도 VR 비디오 스트리밍 시스템 프로토타입의 개발까지 완료되었다. 구현된 스트리밍 시스템 프로토타입은 서브픽처 기반 Viewport-dependent 스트리밍 기술이 적용되어 있으며, 기존 방식과 비교하였을 때 약 80%의 비트율 감소, 약 543%의 영상 디코딩 속도 향상을 확인하였다. 또한, 단순 구현 및 성능평가에서 그치지 않고, 실제 미국 UCSB 에 위치한 대형 가상현실 공연장 AlloSphere 에서의 시범방송을 수행하여, 향후 Phase 2, 3 연구단계를 위한 연구적 기반을 마련하였다.

• Journal of Internet Computing and Services
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• v.22 no.3
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• pp.1-8
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• 2021

Ultra high-quality and ultra high-resolution omnidirectional 360-degree video streaming is needed to provide immersive media through head-mounted display(HMD) in virtual reality environment, which requires high bandwidth and computational complexity. One of the approaches avoiding these problems is to apply viewport-dependent selective streaming using tile-based segmentation method. This paper presents a performance analysis of viewport-dependent tiled streaming on 16K ultra high-quality 360-degree videos and 4K 360-degree videos which are widely used. Experimental results showed 42.47% of bjotegaard delta rate(BD-rate) saving on 16K ultra high-quality 360-degree video tiled streaming compared to viewport-independent streaming while 4K 360-degree video showed 26.41% of BD-rate saving. Therefore, this paper verified that tiled streaming is more efficient on ultra-high quality video.

• Journal of Broadcast Engineering
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• v.18 no.3
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• pp.425-434
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• 2013

Observers usually experience visual fatigue when they watch contents displayed on 3D display. There has been various research on visual fatigue incurred in stereoscopic displays that use 3D glasses, but relatively less studies have been done in the area of autostereoscopic displays. i3D system refers to interactive 3D system that makes it possible for users to interact with contents using their hands. Current research measured visual fatigue that users experience from i3D under various visual environments. We examined the effects of viewing distance, disparities and visual orientation on visual fatigue in i3D. The results indicated that visual fatigue decreased with longer distance and smaller disparity. Visual fatigue increased with angle when 3D fusion was unstable. In addition, there was an interaction effect between angle and distance in which visual fatigue increased with distance under stable 3D fusion but there was no difference in visual fatigue as a function of distance when 3D fusion was unstable. These results would be importantly used to develop autostereoscopic displays that minimize visual fatigue.

• Journal of the Korea Computer Graphics Society
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• v.22 no.3
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• pp.11-20
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• 2016

This paper introduces an effective method for generating 3D stereoscopic images that gives immersive 3D experiences to viewers using mobile-based binocular HMDs. Most of previous AR systems with monocular cameras have a common limitation that the same real-world images are provided to the viewer's eyes without parallax. In this paper, based on the assumption that viewers focus on the marker in the scenario of marker based AR, we recovery the binocular disparity about a camera image and a virtual object using the pose information of the marker. The basic idea is to generate the binocular disparity for real-world images and a virtual object, where the images are placed on the 2D plane in 3D defined by the pose information of the marker. For non-marker areas in the images, we apply blur effects to reduce the visual discomfort by decreasing their sharpness. Our user studies show that the proposed method for 3D stereoscopic image provides high depth feeling to viewers compared to the previous binocular AR systems. The results show that our system provides high depth feelings, high sense of reality, and visual comfort, compared to the previous binocular AR systems.

• Journal of the Korea Society of Computer and Information
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• v.29 no.9
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• pp.137-144
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• 2024

Digital advertising, both indoors and outdoors, is evolving from traditional 2D formats to more immersive 3D forms. 3D advertising involves creating 3D content and displaying it through large LED installations on two sides of a building's corner, or using 3D hologram projectors indoors. This study examines the production process of 3D hologram projectors used indoors and LED-based 3D content used outdoors, analyzing potential issues and considerations when creating 3D digital advertising content. The findings reveal that while indoor hologram projector content provides 3D effects, the low resolution of the devices makes it challenging to implement complex content. However, they are cost-effective and easy to operate. On the other hand, LED-based 3D advertising content, produced in high resolution, requires more time for content creation and incurs higher hardware installation costs. Despite this, it effectively represents complex content and maximizes visibility due to its enhanced 3D effects. In conclusion, it is crucial to create tailored content that matches the resolution of the display device to maximize 3D effects in advertising. Specifically, when producing 3D billboard-style outdoor advertising content, the structure of the building on which it will be installed must be carefully considered.