• Title/Summary/Keyword: KCGS

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A Study on Gamepad/Gaze based Input Processing for Mobile Platform Virtual Reality Contents (모바일 플랫폼 가상현실 콘텐츠에 적합한 게임패드/시선 기반 입력 처리 기술에 관한 연구)

  • Lee, Jiwon;Kim, Mingyu;Jeon, Changyu;Kim, Jinmo
    • Journal of the Korea Computer Graphics Society
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    • v.22 no.3
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    • pp.31-41
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    • 2016
  • This study proposes suitable input processing technique for producing the mobile platform based virtual reality contents. First of all, we produce the mobile platform based virtual reality interactive contents to be used in experiments for improve user's immersion who experience the virtual reality contents, get interests and design the input processing that easily controllable. Then design the input processing technique in two methods, with gamepad that accessibility to mobile and with directly through user's gaze to interface. Through virtual reality based input processing technique that we proposed, we analyse effect of improve user's immersion, cause of get interests and whether provide the convenience or not for controlling contents through experiments. Moreover we verify whether bring negative psychological elements like sickness, fatigue or not.

Composed Animation Production Pipeline using Miniature Set (미니어처 세트를 이용한합성 애니메이션 제작 공정)

  • Kim, Jaejung;Kim, Minji;Seo, Jihye;Kim, Jinmo;Jung, Seowon
    • Journal of the Korea Computer Graphics Society
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    • v.22 no.3
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    • pp.63-73
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    • 2016
  • Animation contents are gradually growing every year, but production period and budget for making one animation contents is insufficient as of now. In particular, in case of animation series that are broadcasted on television, many episodes should be made within a short period of production term. Hence, production pipeline of full three-dimensional animation is frequently chosen in this case. However, another problem emerges as the full three-dimensional animation also requires a lot of time for making high-quality background and for rendering. Composed animation is a production pipeline that attempts to solve such problem. It is a pipeline of producing animation by composing computer graphic (CG) character and real background. It requires relatively small number of human resources compared to the full three-dimensional animation pipeline. Hence, it has an advantage in that natural-looking image can be produced under efficient structure and time for rendering can also be reduced. This paper proposes an efficient process of producing composed animation by using miniature set and three-dimensional computer graphic.

Fast Light Source Estimation Technique for Effective Synthesis of Mixed Reality Scene (효과적인 혼합현실 장면 생성을 위한 고속의 광원 추정 기법)

  • Shin, Seungmi;Seo, Woong;Ihm, Insung
    • Journal of the Korea Computer Graphics Society
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    • v.22 no.3
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    • pp.89-99
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    • 2016
  • One of the fundamental elements in developing mixed reality applications is to effectively analyze and apply the environmental lighting information to image synthesis. In particular, interactive applications require to process dynamically varying lighting sources in real-time, reflecting them properly in rendering results. Previous related works are not often appropriate for this because they are usually designed to synthesize photorealistic images, generating too many, often exponentially increasing, light sources or having too heavy a computational complexity. In this paper, we present a fast light source estimation technique that aims to search for primary light sources on the fly from a sequence of video images taken by a camera equipped with a fisheye lens. In contrast to previous methods, our technique can adust the number of found light sources approximately to the size that a user specifies. Thus, it can be effectively used in Phong-illumination-model-based direct illumination or soft shadow generation through light sampling over area lights.

Physically Inspired Fast Lightning Rendering (물리적 특성을 고려한 빠른 번개 렌더링)

  • Yun, Jeongsu;Yoon, Sung-Eui
    • Journal of the Korea Computer Graphics Society
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    • v.22 no.3
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    • pp.53-61
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    • 2016
  • In this paper, we propose an algorithm for generating lightning paths, which are more realistic than those of random tree based algorithm and faster than a physically based simulation algorithm. Our approach utilizes physically based Dielectric Breakdown Method (DBM) and approximates the electric potential field dramatically to generate the lightning path. We also show a guide path method for the lightning to avoid obstacles in a complex scene. Finally, our method renders fast and realistic lightning by considering physical characteristics for the thickness and brightness of the lightning stream. Our result of the lightning path shares similarity to natural phenomenon by having about 1.56 fractal dimensions, and we can generate the lightning path faster than a previous physically based algorithm. On the other hand, our method is difficult to apply on the real-time games yet, but our approach can be improved by performing the path generation algorithm with GPU in future.

Virtual pencil and airbrush rendering algorithm using particle patch (입자 패치 기반 가상 연필 및 에어브러시 가시화 알고리즘)

  • Lee, Hye Rin;Oh, Geon;Lee, Taek Hee
    • Journal of the Korea Computer Graphics Society
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    • v.24 no.3
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    • pp.101-109
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    • 2018
  • Recently, the improvement of virtual reality and augmented reality technologies leverages many new technologies like the virtual study room, virtual architecture room. Such virtual worlds require free handed drawing technology such as writing descriptions of formula or drawing blue print of buildings. In nature, lots of view point modifications occur when we walk around inside the virtual world. Especially, we often look some objects from near to far distance in the virtual world. Traditional drawing methods like using fixed size image for drawing unit is not produce acceptable result because they generate blurred and jaggy result as view distance varying. We propose a novel method which robust to the environment that produce lots of magnifications and minimizations like the virtual reality world. We implemented our algorithm both two dimensional and three dimensional devices. Our algorithm does not produce any artifacts, jaggy or blurred result regardless of scaling factor.

Virtual Home Training - Virtual Reality Small Scale Rehabilitation System (가상 홈 트레이닝 - 가상현실 기반 소근육 재활 시스템)

  • Yu, Gyeongho;Kim, Hae-Ji;Kim, Han-Seob;Lee, Jieun
    • Journal of the Korea Computer Graphics Society
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    • v.24 no.3
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    • pp.93-100
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    • 2018
  • This paper proposes a small-scale rehabilitation system that allows stroke patients to perform daily rehabilitation training in a virtual home. Stroke patients have limited activities of daily living due to paralysis, and there are many rehabilitation exercises for them to reproduce activities that take place in the house, such as turning lights on and off, door opening and closing, gas valve locking. In this paper, we have implemented a virtual home with the above mentioned daily rehabilitation training elements, by using virtual reality technology. We use Leap Motion, a hand motion recognition device, for rehabilitation of hands and fingers. It is expected that stroke patients can rehabilitate small muscles without having to visit the clinic with uncomfortable body, and will be able to get interesting rehabilitation training by avoiding monotony of existing rehabilitation tools.

Criminal Profiling Simulation Training and Assessment System based on Virtual Reality (가상현실 기반 범죄 프로파일링 시뮬레이션 교육 및 평가 시스템)

  • Kim, Han-Seob;Kim, Hae-Ji;Lee, Yoon-Sik;Lee, Jieun
    • Journal of the Korea Computer Graphics Society
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    • v.24 no.3
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    • pp.83-92
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    • 2018
  • In this paper, we propose a system to a criminal profiling simulation training and assessment with virtual reality technology. Profiling has emerged as the incidence of violent crime has increased by 45.2 % in the country over the past decade. However, the number of profilers in Korea is 36, due to the problem of existing courses. "Criminal Reproduction Learning" is the common way to profiling training, but there are numerous constraints that prevent practical training. Thus, the system used virtual reality technology to overcome existing constraints. Users can receive simulation training and assessment of profiling at crime scene that have been implemented as virtual reality, with an immersive experience through interaction. We expect this system to contribute to the activation of profiling education in many institutions and to the development of good profilers with diverse training.

High-quality Texture Extraction for Point Clouds Reconstructed from RGB-D Images (RGB-D 영상으로 복원한 점 집합을 위한 고화질 텍스쳐 추출)

  • Seo, Woong;Park, Sang Uk;Ihm, Insung
    • Journal of the Korea Computer Graphics Society
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    • v.24 no.3
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    • pp.61-71
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    • 2018
  • When triangular meshes are generated from the point clouds in global space reconstructed through camera pose estimation against captured RGB-D streams, the quality of the resulting meshes improves as more triangles are hired. However, for 3D reconstructed models beyond some size threshold, they become to suffer from the ugly-looking artefacts due to the insufficient precision of RGB-D sensors as well as significant burdens in memory requirement and rendering cost. In this paper, for the generation of 3D models appropriate for real-time applications, we propose an effective technique that extracts high-quality textures for moderate-sized meshes from the captured colors associated with the reconstructed point sets. In particular, we show that via a simple method based on the mapping between the 3D global space resulting from the camera pose estimation and the 2D texture space, textures can be generated effectively for the 3D models reconstructed from captured RGB-D image streams.

Visualization System for Natural Disaster Data (자연재난 데이터 실감 가시화 시스템)

  • Kim, Jongyong;Jeong, Seokcheol;Lee, Gyeweon;Cho, Joonyoung;Kim, Dongwook;Park, Sanghun
    • Journal of the Korea Computer Graphics Society
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    • v.24 no.3
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    • pp.21-31
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    • 2018
  • We introduces a system that enables fast and effective visualization of natural disaster data such as typhoons, tsunamis, floods, and flooding to help make informed decisions in disaster situations. Data containing disaster information consists of a few hundred megabytes to many tens and hundreds of gigabytes, which can not be handled by a PC. This system was implemented in the form of a client-server based service to generate and output results from high-performance servers. The server in a built-in, high-performance cluster handles client requests and sends the result of visualization to the client. Clients can receive the results in any form of images, videos, or 3D graphic model by specifying a desired time frame, effectively viewing the results with a user-friendly GUI.

Hand Tracking Based Projection Mapping System and Applications (손 위치 트래킹 기반의 프로젝션 매핑 시스템 및 응용)

  • Lee, Cheongun;Park, Sanghun
    • Journal of the Korea Computer Graphics Society
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    • v.22 no.4
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    • pp.1-9
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    • 2016
  • In this paper we present a projection mapping system onto human's moving hand by a projector as information delivery media and Kinect to recognize hand motion. Most traditional projection mapping techniques project a variety of images onto stationary objects, however, our system provides new user experience by projecting images onto the center of the moving palm. We explain development process of the system, and production of content as applications on our system. We propose hardware organization and development process of open software architecture based on object oriented programming approach. For stable image projection, we describe a device calibration method between the projector and Kinect in three dimensional space, and a denoising technique to minimize artifacts from Kinect coordinates vibration and unstable hand tremor.