• Journal of the Korea Computer Graphics Society
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• v.11 no.3
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• pp.41-48
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• 2005

시청자의 개입에 따라 내용이 변하는 영상은 영상산업 및 컴퓨터 그래픽스 분야에서 대중들의 새로운 흥미를 불러일으킨다. 그러나, 그러한 영상을 생성하는 시스템을 만드는 일은 제한된 개수의 영상으로 다양하면서 온전한 영상의 변화를 만들어야 하고, 사용자에게 그 변화를 조정하는 권한을 주어야 하기 때문에 어려운 일이다. 본 논문에서는 이 문제를 해결하는 한 방법으로 개별적인 실사 촬영물을 이용하여 인터랙티브 드라마를 생성하는 시스템을 제안한다. 이 시스템은 개별적인 영상 알갱이들을 부드럽게 연결하여, 다양한 줄거리와 완결된 구조를 갖춘 드라마를 생성한다. 또한, 사용자는 생성된 드라마의 내용, 길이, 장르, 등장인물을 원하는 대로 바꿀 수 있다. 이러한 시스템을 만들기 위하여 씬(scene)을 새로운 방법으로 모델링 하였고, 씬들을 적절히 선택하여 연결하기 위한 방법으로 씬 그래프(scene graph)를 제안한다. 최종 영상과 사용자와의 상호 작용을 위해서는 비젼, 모션, 그리고 스케치 기반 인터페이스를 제시한다. 끝으로 설문 조사를 통해 이 시스템의 유용성을 평가한다.

• Journal of the Korea Computer Graphics Society
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• v.11 no.1
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• pp.40-49
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• 2005

Several optimization techniques have been proposed for volume ray casting, but these cannot achieve real-time frame rates. In addition, it is difficult to apply them to some applications that require perspective projection. Recently, hardware-based methods using 3D texture mapping are being used for real-time volume rendering. Although rendering speed approaches real time, the larger volumes require more swapping of volume bricks for the limited texture memory. Also, image quality deteriorates compared with that of conventional volume ray casting. In this paper, we propose a data structure for real-time volume ray casting named PERM (Precomputed dEnsity and gRadient Map). The PERM stores interpolated density and gradient vector for quantized cells. Since the information requiring time-consuming computations is stored in the PERM, our method can ensure interactive frame rates on a consumer PC platform. Our method normally produces high-quality images because it is based on conventional volume ray casting.

• Journal of the Korea Computer Graphics Society
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• v.29 no.3
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• pp.45-57
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• 2023

Unity is a powerful game engine that can be used to create 2D or 3D content. The current study focuses on the use of Unity for 3D computer animations, covering the strengths, basic concepts and tools for creating and integrating 3D animations in Unity, including the use of keyframe animation, animation controllers, and blend trees. Also covering advanced topics such as skeletal animation, procedural animation and their applications in games, simulations, and other interactive media. Case studies that showcase the potential of Unity for 3D animation will be analyzed and discussed taking in the quality of visuals and the receptance by the public in general.

• Journal of the Korea Computer Graphics Society
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• v.21 no.3
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• pp.46-54
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• 2015

Development of digital technology is advancing to levels which influence the formation of city landscapes and spaces. The use of media facade is creating modernized city-spaces with contemporary application of various digital mediums. In this way, media facade functions as media-art in an artistic point of view, while also providing the means for buildings to become landmarks in a city-scape point of view. Going a step further, media facade using interaction is drawing a lot of attention as it enables communication with the city inhabitants instead of one-way contents provision. This paper will research such interactive media facade using transparent display glass currently being used as construction building material and its potential growth.

• Journal of the Korea Computer Graphics Society
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• v.3 no.1
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• pp.29-36
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• 1997

Most Virtual Reality Systems have been developed to support only a single user on a stand-alone system. With increasing availability of Internet, many people are taking strong interests in distributed Virtual Reality : the virtual environment is shared by many paticipants interacting over the network. To support sharing virtual environment and interactions on a network, we developed novel contributions to 3D world description and a network model. Interactive 3D world description is based on VRML, which is extended to support multi-user interactions. Then network model in our system consists of an architecture and a set of protocols for realizing a multi-user interactive shared 3D environment in IP multicast environment.

• ETRI Journal
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• v.25 no.3
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• pp.156-170
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• 2003

Gamut compression algorithms have traditionally been defined functionally and then tested with deductive methods, e.g., psychophysical experiments. Our study offers an alternative, an inductive method, in which observers judge image colors to represent the original images more accurately. We developed a computer-controlled interactive tool that modifies the color appearance of pictorial images displayed on a monitor. In experiments, observers used the tool to alter color pixels according to the region of color space to which they belonged. We created three different gamut compression algorithms based on the observer experimental data. Observer groups evaluated the performance of the newly-developed algorithms, existing gamut compression algorithms, and an image based on the average observers' results from experiments in this study. The study of gamut extension is unlike the study of gamut compression in that it mainly deals with the degree of image pleasantness as judged by observers. The results of the gamut extension experiments in this study not only make available worthwhile data but also suggest a methodology for using the observer experimental tool for future gamut extension research.

• Journal of the Korea Computer Graphics Society
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• v.2 no.1
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• pp.86-92
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• 1996

Multimedia services through a network are getting more required according to the realization of B-ISDN construction globally. Business using the Internet will become popular, and so multimedia information systems including telemarketing systems will be developed competitively. VR (Virtual Reality) will help such systems make more realistic and valuable. ln this paper, we present an interactive VR authoring tool and a client/server based multimedia information service system. The VR authoring tool serves an interface with the system when developing its applications.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 1989.10a
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• pp.65-70
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• 1989

Until recently post-processing of finite element model has been Heavily relied on expensive graphic peripheral devices. For this reason many engineers and researchers can not afford to access to the graphics. with the aid of inexpensive personal computers very econmical post-processor graphics program called MICRO-POST has been developed in conjunction with low-cost printers and plotters. Model geometry or results of analysis for the unlimitted meshes either produced by mainframe or microcomputer can be easily and economi-call presented in a number of different graphic devices. The paper presents the procedure obtaining the device the independent graphics, and the structure and functions of the program. It also describes a new error-preventive dialogue type input technique to control the plot operation in an interactive manner. Through the post-processing examples for the general purpose finite element programs, it demonstrates the usefulness of the program.

• Journal of the Korea Computer Graphics Society
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• v.13 no.2
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• pp.17-22
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• 2007

In early stages of film or animation production, storyboard is used to visually describe the outline of a story. Drawings or photographs, as well as the texts, are employed for character / item placements and camera pose. However, commercially available storyboard tools are mainly drawing and editing tools, not providing functionality for item placement and camera control. In this paper, an Augmented Reality based storyboard tool is presented, which provides an intuitive and easy-to-use interface for storyboard development. Using the presented tool, non-expert users may compose 30 scenes in his or her real environments through tangible building blocks which are used to fetch corresponding 3D models and their pose.

• Journal of Multimedia Information System
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• v.2 no.2
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• pp.207-214
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• 2015

In this paper, we proposed new software for 3D rendering of MR images in the medical domain using C# wrapper of Visualization Toolkit (VTK) and Microsoft .NET framework. Our objective in developing this software was to provide medical image segmentation, 3D rendering and visualization of hippocampus for diagnosis of Alzheimer disease patients using DICOM Images. Such three dimensional visualization can play an important role in the diagnosis of Alzheimer disease. Segmented images can be used to reconstruct the 3D volume of the hippocampus, and it can be used for the feature extraction, measure the surface area and volume of hippocampus to assist the diagnosis process. This software has been designed with interactive user interfaces and graphic kernels based on Microsoft.NET framework to get benefited from C# programming techniques, in particular to design pattern and rapid application development nature, a preliminary interactive window is functioning by invoking C#, and the kernel of VTK is simultaneously embedded in to the window, where the graphics resources are then allocated. Representation of visualization is through an interactive window so that the data could be rendered according to user's preference.