• Journal of the Korea Computer Graphics Society
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• v.9 no.4
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• pp.9-15
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• 2003

컴퓨터 게임, 지리정보시스템(GIS), 가상현실 분야 등에서 환경표현의 기반이 되는 지형의 렌더링 기술은 매우 중요하다. 하지만 지형정보는 일반적으로 방대한 양의 데이터로 구성되어 처리가 쉽지 않다. 지형렌더링을 수행하기 위한 여러가지 기법들 중에 쿼드트리 구조를 기반으로한 연속적 상세단계기법이 있다. 본 논문에서는 쿼드트리 기반의 연속적 상세단계에서 시각 절두체 내에서 렌더링되는 삼각형의 개수를 조절하여 프레임율을 일정하게 유지하는 기법을 제안한다. 이 방법은 인접 프레임간의 일관성을 이용하여 최근 프레임에 가중치를 줌으로써 삼각형의 개수가 급격하게 변하는 것을 막는다.

• Journal of the Korea Computer Graphics Society
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• v.6 no.4
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• pp.15-22
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• 2000

One of the main research trends in image based modeling and rendering is how to implement plenoptic function. For this purpose, this paper proposes a novel approach based on a set of randomly placed panoramas. The proposed approach, first of all, adopts a simple computer vision technique to approximate omni-directional depth information of the surrounding scene, and then corrects/interpolates panorama images to generate an output image at a vantage viewpoint. Implementation results show that the proposed approach achieves smooth navigation at an interactive rate.

• Archives of design research
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• v.11 no.1
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• pp.161-172
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• 1998

The evolution of computing environments caused various dharges in our society. The change cj instruction media is one of these effects. WWW using network techndogy is regarded as a pov.powerful tool for rerrote instruction. The methods of utilizing network technologies in design instrudion and design process rould be diversified comparing with those of other general instruction. Computer graphics has been regarded as a very use!u design tool for its accuracy and rapidty. Network can help us to do creative work using cornplter graphics. The merits of this technology are sharing resources and rraking it easy to roIlaborate. Recent cxxnputer graphics instruction has some defects in oontents and methods. The oontents have a weak relationship with other industrial design subjects. From above, the purpose of this thesis is to use computer graphics and netv.urk technology for supporting basic design instruction. Virtual gallery using WWW can be a cyberspare v.tlere the evaluation of results and the exchange of information take plare. This tool makes it easier to oomrunicate and oollaborate with dassmates. A casestudy-Composition with basic objectswas exea.rted by individual for distributed asynchronous rmde. The results of this thesis are summarized for four factors. Rrst, it was easy to transform idea. Serond, student-oriented working was performed. Third, interaction among students was activated. Fourth, not only final results, but also midterm results was oonsidered for evaluation. These methods also have problems as rerent instruction methods, but it rould be used as a instruction tool to compensate for existing instruction methods.

• Journal of the Korea Computer Graphics Society
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• v.18 no.4
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• pp.17-23
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• 2012

The convergence of IT technology and fashion is a marked trend in recent years induding sportswear, m-dress (mobile phone dress), and wearable computing. Despite continued research and record high development in the field, however, there still are unsettled issues like power supply, fit, washability and mobility when it comes to commercializing technological fashion product. In this context, this thesis is to propose feasible technology effectively applied to a portable bag. The first case is a bag designed to maximize sensitivity for a family who enjoys leisure activities often. The second one is a limited editionHaute Couture style bag targeting single women in their 20s and 30s. These two case studies are an attempt to demonstrate the possibility of applying wearable technology to a product design.

• Journal of the Korea Computer Graphics Society
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• v.24 no.5
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• pp.21-30
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• 2018

In this paper, we use Sound-tracing, a 3D sound technology based on ray-tracing that uses geometric method as auditory technology to enhance realism. The Sound-tracing is costly in the sound propagation stage. In order to reduce the sound propagation cost, we propose a method to calculate the average effective frame number of previous frames using the frame coherence property and to adjust the depth according to the space based on the calculated number. Experimental results show that the path loss rate is 0.72% and the traversal & Intersection test calculation amount is decreased by 85.13% and the frame rate is increased by 4.48% when the sound source is indoors, compared with the result of the case without depth control. When the sound source was outdoors, the path loss was 0% and the traversal & Intersection test calculation amount is decreased by 25.01% and the frame rate increased by 7.85%. This allowed the rendering performance to be increased while minimizing the path loss rate.

• Archives of design research
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• v.19 no.1 s.63
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• pp.79-88
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• 2006

A human face figure is a visual symbol of identity. Each different face per person is a critical information differentiating each person from others and it directly relates to individual identity. When we look back human history, historical change of recognition for a face led to the change of expression and communication media and it in turn caused many changes in expressing a face. However, there has not been no time period when people pay attention to a face more than this time. Technically, the advent of computer graphics opened new turning point in expressing human face figure. Especially, a visual image which can be produced, saved, and transferred in digital has no limitation in time and space, and its importance in communication is getting higher and higher. Among those visual image information, a face image in digital is getting more applications. Therefore, 3d (3-dimensional) expression of a face using computer graphics can be easily produced without any professional techniques, just like assembling puzzle parts composed of the shape of each part ands texture map, etc. This study presents a method with which a general visual designer can effectively express 3d type face by studying each producing step of 3d face expression and by visualizing case study based on the above-mentioned study result.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.763-765
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• 2005

볼륨 렌더링은 3차원이나 그 이상의 차원의 볼륨 데이터에서 의미있는 정보를 추출해 내어 직관적으로 표출하는 가시화 기법을 말하며 의료영상 기상학, 유체역학 등 다양한 분야에서 널리 사용되고 있다. 한편, 최근 PC 하드웨어의 급격한 발전으로 과거에는 슈퍼컴퓨터에서나 가능했던 대용량 볼륨 데이터의 가시화가 일반 PC 환경에서도 가능하게 되었다. PC 그래픽스 하드웨어의 꼭지점 및 픽셀 세이더의 수치 계산에 최적화된 벡터 연산으로 빠른 볼륨 가시화를 가능하게 한 것이다. 그러나 그래픽스 하드웨어의 메모리 용량의 한계로 대용량의 볼륨 데이터를 빠르게 가시화하는 것은 지금까지 어려운 문제로 남아있다. 본 논문에서는 한국과학기술정보연구원에서 제작한 대용량의 인체영상 데이터인 Visible Korean Human 데이터를 여러 개의 그래픽스 하드웨어 메모리에 분산시키고 이를 꼭지점 및 픽셀 쉐이더를 이용하여 빠르게 가시화하여 고해상도의 이미지를 얻고자 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.724-726
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• 2005

지금까지의 컴퓨터 그래픽스의 방향은 사진과 유사하게 표현하는 Photorealism이 강세였으나, 최근 각종 기술문서나 의학, 교육등 많은 분야에서 사진과 같은 컴퓨터 그래픽스보다는 사물의 특징을 강조하고, 불필요한 부분을 생략해서 표현하는 비사실적 렌더링(Non-Photorealistic Rendering)분야가 새롭게 떠오르고 있다. 비실사기법을 통해 생성된 이미지는 사물의 특징을 부각시켜 시현함으로서 사진과 같은 사실적인 묘사보다는 사물의 특징을 통한 의미전달에 초점을 둔 렌더링 기법이라 할 수 있다. 비실사기법에는 수채화, 수묵화, 유화, 목탄화, 데생과 같은 미술기법과 만화와 같이 표현하는 Cartoon Rendering등 다양한 분야가 있지만 본 논문에서는 모든 그림의 기본 요소가 되는 정을 이용하여 사물을 표현하는 점묘법을 적용한 비실사기법에 대해서 이미 발표된 논문을 살펴보고, 새로운 기법을 제안하고자 한다.

• Journal of the Korea Computer Graphics Society
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• v.1 no.2
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• pp.269-272
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• 1995

본 논문에서는 자연지형의 3차원 투사도 제작기술에 비행기의 비행조건을 고려하여 개발한 비행 시뮬레이터에 대하여 설명하고자 한다. 여기서 발표하고자 하는 비행 시뮬레이터란 3차원의 자연지형을 마치 비행기를 타고가며 보는 것과 같은 효과를 낼 수 있게 하는 시스템을 말한다. 본 시스템은 사용자의 편의성을 도모하기 위하여 Sun workstation (SPARC 10)상에서 X11R5와 Motif 그리고 C언어를 이용하여 개발되었으며, 사용자가 비행경로, 비행속도, 비행고도 등의 비행 파라메타들을 마우스를 이용하여 손쉽게 입력할 수 있도록 구성되어 있다.

• Journal of the Korea Computer Graphics Society
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• v.4 no.1
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• pp.21-29
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• 1998

This paper deals with character animation using motion capture. The captured motion requires the editing process to smooth the jerky motion by the sensor noise, or to combine several clip-motion libraries. For this purpose, we describe a simple technique for editing the captured motion using the Kalman filter technique. Our formulation allows the generated motion to satisfy the kinematic constraints of the human model. Furthermore, it provides us with a multi-level control mechanism of the motion resolution by changing the uncertainty of the measurement model and the seamless motion transition.