• Proceedings of the IEEK Conference
• /
• 2003.07e
• /
• pp.1895-1898
• /
• 2003

양안 입체 TV 에서는 3 차원 카메라의 시점거리에 따라 눈의 편안함과 3 차원 효과 사이에 대차 관계가 존재한다. 일반적으로 카메라 사이의 거리가 인간의 동공 사이의 거리인 65㎜ 일 때 최적의 효과를 낸다고 한다. 그러나 일반적인 방송용 화질의 상용 카메라는 렌즈 크기가 크기 때문에 이 거리를 맞춘 3 차원 카메라를 제작하기는 매우 어렵다. 그래서 보기 편한 양안입체 영상을 제공하기 위해서는 스테레오 카메라에서 얻은 영상을 조작하여 원하는 가상 시점에서의 영상으로 만들어 줄 필요가 있다. 본 논문에서는 먼저 적응적 다중 창틀 정합을 이용한 계층적 변이 추정을 사용하여 변이 지도를 추출하고, 이것을 이용하여 가상 시점에서의 영상을 합성했다. 다양한 스테레오 영상을 이용한 실험을 통해 제안된 기법의 타당성을 확인하였다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.05a
• /
• pp.659-662
• /
• 2003

본 논문에서는 2차원 영상 사이에 움직임 변위를 검출하여 영상내의 원근 깊이를 생성하였으며 양 시차(positive) parallax처리를 하여 입체 영상을 생성한 방법을 제안했다. 이 방식은 2 차원 영상내의 사물의 운동 방향과 속도에 관계없이 3차원 효과를 느낄 수 있다. 제안한 방법은 다양한 영상원에 대해서 실시간으로 입체 영상 변환이 가능하며 LCD shutter goggle 방식의 입체 영상 장치를 통해 실제 시각적인 검증을 수행하였다.

• KIPS Transactions on Software and Data Engineering
• /
• v.5 no.4
• /
• pp.195-202
• /
• 2016

There have been many studies on subject tests for 3D contents using 3D glasses, but there is a limited research for 3D contents using autostereoscopic display. In this study, we investigated to assess usability of electroencephalogram (EEG) as an objective evaluation for 3D contents with different quality using autosteroscopic display, especially for lenticular lens type. The image with optimal quality and the image with distorted quality were separately generated for autostereosopic display with lenticular lens type and displayed sequentially through lenticular lens for 26 subjects. EEG signals of 8 channels from 26 subjects exposed to those images were detected and correlation between EEG signal and the quality of 3D images were statistically evaluated to check differences between optimal and distorted 3D contents. What we found was that there was no statistical significance for a wave vibration, however b wave vibration shows statistically significant between optimal and distorted 3D contents. b wave vibration observed for the distorted 3D image was stronger than that for the optimal 3D image. This results suggest that subjects viewing the distorted 3D contents through lenticular lens experience more discomfort or fatigue than those for the optimum 3D contents, which resulting in the greater b wave activity for those watching the distorted 3D contents. In conclusion, these results confirm that electroencephalogram (EEG) analysis can be used as a tool for objective evaluation of 3D contents using autosteroscopic display with lenticular lens type.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2015.10a
• /
• pp.171-173
• /
• 2015

This paper proposes a design method of an authoring tool for making 3D e-book using DirectX development tools. There are several functions such as generation and modification of 3D objects, modification of textures, stereoscopic modes and pictures, video export and so on in the proposed authoring tool. To support these functions, we proposes design scheme such as data structures for generating 3D objects, anaglyph method using color differences and video export method using BandiCap library.

• The Journal of the Korea Contents Association
• /
• v.4 no.2
• /
• pp.7-12
• /
• 2004

The technique of birdeye image generation of terrain through the use of satellite digital images and digital maps are very important elements and have applications in fanning establishment as well as the actual design of several construction works in complex fields. This paper studies stereo perspective image generation as a possibility through 3-dimensional analysis combined with digital elevation data and remotely sensed images. For this, first of all, ortho-images generated by very accurate GCP and DEM from contour file makes 3-dimensional terrain analysis possible and allows stereo­viewing at the highway construction planning sites. So, we developed the technical methods for the 3-dimensional approach on the planning sites of highways by use of perspective orthoimages. From this research, diverse terrain analysis is possible through stereo perspective image generation, and can leads to various application in road construction through gain study results from access to realtime virtual spatial on the objects area in korea.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.04a
• /
• pp.625-628
• /
• 2017

최근 산업의 급격한 발전으로 부품의 정밀한 가공에 대한 요구치가 높아지고 있다. 또한 생산 공장에서 기계를 효율적으로 운용하기 위해 가공된 제품을 정밀하게 분석 할 필요가 있다. 이를 위해서는 육안으로 판단할 수 없는 미세한 차이를 구분 할 수 있어야한다. 이전 연구에서는 2차원적으로만 분석이 가능했으며, 분석 가능한 시스템은 PCB 회로편심, 폭, 원의 지름 등 이였다. 하지만 정밀한 제품을 생산하기 위해 2차원만으로 제품을 분석하기에는 무리가 있다. 따라서 본 논문에서는 3차원을 통해 제품의 입체형상을 제공하고 실제 단면의 모습을 구체화하여 기존의 2차원적 방식에서 제품의 정밀도를 더 명확하게 판단 할 수 있도록 3차원 입체형상을 더한 확장된 분석 시스템을 제안한다.

• Journal of Digital Contents Society
• /
• v.16 no.1
• /
• pp.127-135
• /
• 2015

The development of stereoscopic display hardwares and 3D authoring softwares expands its application areas from particular virtual simulation applications to general movies, games, advertising applications. However, the binocular-based 3D stereoscopic images cause fatigue to viewers. Recent performed many research results about the binocular stereoscopy's depth perception and viewers' fatigue are derived from experimental users studies. In some results, watching and making guidelines for 3D stereoscopic imaging contents are introduced. The 3D stereoscopic-related contents have the contradictory aspects, which are audiences' pursuit of a tolerable minimum fatigue and producer's its of excessive depth changes for providing viewers' immersion. This paper provides user experiments and analysis data in aspects of 3D depth changes. For use of producers, a safety zone and translational velocity of 3D depth changes are introduced. Also, on the viewer side, we present the depth change adaptation time by using an EEG device.

• Smart Media Journal
• /
• v.1 no.1
• /
• pp.10-16
• /
• 2012

Stereo and multi-view cameras have been used to capture the three-dimensional (3D) scene for 3D contents generation. Besides, depth sensors are frequently used to obtain 3D information of the captured scene in real time. In order to generate 3D contents from captured images, we need several preprocessing operations to reduce noises and distortions in the images. 3D contents are considered as the basic media for realistic broadcasting that provides photo-realistic and immersive feeling to users. In this paper, we show technical trends of 3D image capturing and contents generation, and explain some core techniques for 3D image processing for realistic 3DTV broadcasting.

• Radiation Oncology Journal
• /
• v.15 no.4
• /
• pp.287-296
• /
• 1997

Purpose : This is study of whether 3-D conformal radiotherapy for carcino-mas of the ethmoid sinus were better than those treated with conventional 2-D plan, Materials and Methods : The 3-D conformal treatment Plans were compared with conventional 2-D plans in 4 patients with malignancy of the ethmoid sinus. Isodose distribution, dose statistics, and dose volume histogram of the planning target volume were used to evaluate differences between 2-D and 3-D plans. In addition. the risk of radiation exposure of surrounding normal critical organs are evaluated by means of point dose calculation and dose volume histogram. Results : 3-D conformal treatment plans for each patient that the better tumor coverages by the planning target volume with improved dose homo-geneity, compared to 2-D conventional treatment Plans in the same Patient. On the other hand, the radiation dose distributions to the surrounding nor-mal tissue organs, such as the orbit and optic nerves are not significantly reduced with our technique, but a substantial sparing in the brain stem and optic chiasm for each patient. Conclusion : Our findings represented the potential advantage of 3-D treatment planning for dose homogeniety as well as sparing of the normal tissue surrounding the tumor. However, further investigational studies are required to define the clinical benefit.

• Investigative Magnetic Resonance Imaging
• /
• v.16 no.1
• /
• pp.67-75
• /
• 2012

Purpose : We studied enhanced method to view the vessels in the brain using Magnetic Resonance Angiography (MRA). Noticing that Maximum Intensity Projection (MIP) image is often used to evaluate the arteries of the neck and brain, we propose a new method for view brain vessels to stereo image in 3D space with more superior and more correct compared with conventional method. Materials and Methods: We use 3T Siemens Tim Trio MRI scanner with 4 channel head coil and get a 3D MRA brain data by fixing volunteers head and radiating Phase Contrast pulse sequence. MRA brain data is 3D rotated according to the view angle of each eyes. Optimal view angle (projection angle) is determined by the distance between eye and center of the data. Newly acquired MRA data are projected along with the projection line and display only the highest values. Each left and right view MIP image is integrated through anaglyph imaging method and optimal stereoscopic MIP image is acquired. Results: Result image shows that proposed method let enable to view MIP image at any direction of MRA data that is impossible to the conventional method. Moreover, considering disparity and distance from viewer to center of MRA data at spherical coordinates, we can get more realistic stereo image. In conclusion, we can get optimal stereoscopic images according to the position that viewers want to see and distance between viewer and MRA data. Conclusion: Proposed method overcome problems of conventional method that shows only specific projected image (z-axis projection) and give optimal depth information by converting mono MIP image to stereoscopic image considering viewers position. And can display any view of MRA data at spherical coordinates. If the optimization algorithm and parallel processing is applied, it may give useful medical information for diagnosis and treatment planning in real-time.