• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2018.05a
• /
• pp.135-136
• /
• 2018

본 논문에서는 Video See Through VR을 구현하기 위해 외부 광학 카메라와 HMD(Head Mounted Display)간의 영상을 혼합하기 위한 기술로 두 소스 간의 정렬, 캘리브레이션 등의 관련 기법에 대해 고찰한다. 스테레오 카메라 영상의 혼합과 광학적으로 왜곡된 영상의 보정, 현실 스케일과 렌즈를 통해 들어오는 영상과의 스케일 매칭 관련 사항을 제시한다.

• Journal of Korea Multimedia Society
• /
• v.3 no.4
• /
• pp.389-398
• /
• 2000

The focus of this study is to investigate how personal display system - Head Mounted Display(HMD) and VDU-affect to the body in virtual environments. This prediction was tested by a comparing of playing 3D games while wearing a HMD and monitoring a VDU for an hour. As quantitative measuring and analyzing tools, SSQ, RSSQ, pre and post posture stability test and vision test are used. The results showed that SSQ and RSSQ total score (TS) are related with the results of pre and post posture stability test and SSQ and RSSQ TS of HMD is higher than TS of VDU by one point five times. Especially, TS of MRG3C, having large field of view, has a possibility by two times of simulator sickness (SS). And in order to investigate the degree of SS regarding to the simulator control condition, two conditions, subjective-passive and subjective-active environments were compared. However, there was no significant difference between two environments. The repetition of the same environment has no effect to reduce the SS. Disorientation and oculomotor scores of the SSQ and RSSQ are higher than that of another symptoms. In addition, RSSQ score of strain/confusion is higher than that of nausea. Therefore, we assume that personal fear could possibly increase the simulator sickness in virtual environments.

• Journal of the Korea Society of Computer and Information
• /
• v.13 no.1
• /
• pp.169-173
• /
• 2008

A navigation system for virtual environments using low-quality HMD(head mounted display) must quantize images when the system presents true-color image with restricted number of colors. Such navigation system quantizes an image by using fixed palette. If the system represents an image by using a variable palette which is made considering a region around the viewpoint then user can perceive a virtual environments more vividly because human visual system is sensitive to the colors variation in the region around the viewpoint. In this paper we propose a color quantization algorithm that quantize a region around the viewpoint more finely than other regions at each variation of viewpoint for virtual environments navigation system.

• Korean Journal of Optics and Photonics
• /
• v.34 no.4
• /
• pp.157-169
• /
• 2023

Augmented reality (AR) using a head mounted display (HMD) is used in various fields such as military, medicine, manufacturing, gaming, and education. In this paper, we discuss the design and fabrication of the AR optical system, which is most essential for HMD. The AR optical system for HMD requires a wide transparent area in which the augmented image of the display and the real world can be viewed at the same time. To this end, an AR optical system was designed and manufactured by dividing it into three parts according to each characteristic. Also, the refractive index of the ultra-violet (UV) adhesive layer required to make the three optical systems into one complete AR optical system was considered from the design stage to minimize the optical path shift phenomenon when the input light source passes through the UV adhesive layer. In addition, when designing the AR optical system, two aspheric surfaces were used to compensate for off-axis aberration and to be suitable for mass production. Finally, for HMD mass production, an aspheric AR optical system with a thickness of 11 mm, a diagonal field of view of 40°, and a weight of 11.3 g was designed and manufactured.

• Proceedings of the Korean Society of Disaster Information Conference
• /
• 2015.11a
• /
• pp.335-338
• /
• 2015

본 논문에서는 가상훈련 기반 소방안전교육에 관한 것으로, 건물 내 화재 발생 시 대처할 수 있는 방안에 대한 방법론을 제시한다. 기존의 소방교육은 오프라인 형태로 여러 명이 모여 훈련을 받아야 하는 만큼 공간적, 시간적 제약이 많다. 이러한 시공간적 제약을 없는 체감형 훈련 방안을 시스템으로 구축하고, 소방 훈련 콘텐츠를 탑재한다. 건물 내 화재 발생시 5분내 초기 대처가 중요한 만큼. 가상훈련의 실제 5분을 기준으로 훈련 방법을 제시한다. 본 소방안전교육 시스템은 HMD(Head Mounted Display)을 적용하여, 3차원의 입체 디스플레이를 적용하며, 훈련자의 움직임에 따라, 가상공간 내 실시간 반영될 수 있는 기술을 포함한다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2014.10a
• /
• pp.141-145
• /
• 2014

A minimally appropriate time delay of audio data processing is investigated for rendering virtual sound source direction in real-time head-tracking environment under headphone listening. Less than 3.7 degree of angular mismatch should be maintained in order to keep desired sound source directions in virtually fixed while listeners are rotating their head in a horizontal plane. The angular mismatch is proportional to speed of head rotation and data processing delay. For 20 degree/s head rotation, which is a relatively slow head-movement case, less than total of 63ms data processing delay should be considered.

• Journal of the Optical Society of Korea
• /
• v.19 no.6
• /
• pp.614-618
• /
• 2015

This paper described an off-axis head-mounted display system. It is composed of a 7-piece coaxial relay lens group and a freeform surface combiner. This configuration has a simple structure and a wide field of view (FOV). In this design, a freeform surface is chosen as the combiner, to simplify the structure and attain good image quality. We generated this freeform surface by considering both coordinates and normals of discrete data points. Moreover, we realize a coaxial structure in the relay lens group, which is compact and benefits from a loose tolerance requirement. The HMD system we finally realized has a 40° × 30° FOV and 15-mm exit pupil diameter.

• Journal of Platform Technology
• /
• v.6 no.2
• /
• pp.3-9
• /
• 2018

Recently VR environment is used in many areas including mobile learning, smart factory. However HMD(head-mounted display) is required to a dedicated and expensive system with high-end specification. When designing a VR system, it is needed to handle performance, mobility and usability. Many VR applications need to handle diverse sensors and user inputs continuously in a streaming manner. In this paper we design a VR mobile platform and implement a low-cost mobile VR HMD running on the platform. The VR HMD supports 3D contents delivery in a mobile manner. It is used to detect the motion detection based on angle value of a VR player from accelerator and gyro sensor. The MPU-6050, 6-axis sensor, is used to get a sensory value and the sensory value is taken as an input to a VR rendering server on a Unity game engine that is generated 3D images.

• the USERS
• /
• s.43
• /
• pp.46-49
• /
• 2004

차세대PC산업을 포함하여 여러 산업 분야를 통합을 주도하는 기술로 주목받고 있는 웨어러블 컴퓨터(Wereable Computer). 최적의 웨어러블 컴퓨팅 환경의 구현을 위해 고려되어야할 요인, HMD(Head Mounted Display)등의 주변기기의 개발 및 상용화 등 일상생활로 파고드는 웨어러블 컴퓨터의 이모저모를 살펴보자.

• Smart Media Journal
• /
• v.5 no.3
• /
• pp.62-66
• /
• 2016

The recent increase in virtual reality (VR) technology around the world has been VR work in cooperation with technology from other sectors to form new trends. In the case of advertising, it is difficult to trace if VR users viewed a certain piece of advertisement because the current technology does not allow them to interact with the screen. Eye tracking technology can act as a solution to the problem of tracing advertisement views as it allows for data extraction in relation to which advertisements were viewed and for how long. The research paper suggests a method of how to track the eyes of users in VR advertising. The suggested method includes communication between a server and VR HMD (virtual reality head mounted display) as well as a screen of output from the server.