• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권11호
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• pp.4413-4425
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• 2020

In order to completely record all the information of realistic scenes, high dynamic range (HDR) images have been widely used in virtual reality, photography and computer graphics. A simple yet effective tone mapping method based on total variation is proposed so as to reproduce realistic scenes on low dynamic range (LDR) display devices. The structural component and texture component are obtained using total variation model in logarithmic domain. Then, the dynamic range of the structural component is compressed with an adaptive arcsine function. The texture component is processed by Taylor series. Finally, we adjust the saturation component using sigmoid function and restore the color information. Experimental results demonstrate that our method outperforms existing methods in terms of quality and speed.

• 한국멀티미디어학회논문지
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• 제22권6호
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• pp.716-728
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• 2019

This study explores the concept of spectacular realism. and finds out how spectacular realism is made in movies. The Movies's spectacle is a realistic spectacle that does not miss the reality. so audiences can immerse themselves in it. Nowadays the spectrum of visual realism is becoming very diverse. "Perceptual realism" means to feel more like real than to reproduce reality as it is. "Synthetic realism" is a realism that CGI makes. And "Spectacular realism" makes the spectators concentrate to images than narrative or character. It means the dominance of the visual. The films and showed "Spectacular realism" especially in the aerial battle scenes. The films use 'Presentation of a new spatial sensation using unusual angles', 'Editing that constitutes transcendental time' and 'Intense contrast' as methods to embody spectacular realism. And the harmonious arrangement of transcendental images and very realistic screens effectively embodies Spectacular Realism. This discussion, which began in the air battle scene, could contribute to a broader and more diverse exploration of the implementation of spectacular realism images in the future.

• International Journal of Internet, Broadcasting and Communication
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• 제14권1호
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• pp.105-115
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• 2022

The platform for displaying cars has been changing with the times. From the popularity of paper media to the rise of computer graphics, the improvement of technology has brought more space and possibilities to the automotive industry. Yiming Zhong proposed the workflow of car configurator through Unreal Engine 4 to implement the basic functions of configuration in 2021, according to Yiming Zhong's final presentation, there is still room to improve the realism of graphics and functionality of the car configurator. Therefore, in this paper we propose to upgrade the car shaders and lighting environments according to the real-world physics and add multi-scenes switching function to car configurator. However the multi-scenes switching function also brings a large amount of data, which leads to the problem of display lag. At the end of the paper, we use the level of details(LOD) process to reduce the amount of data for real-time computing in Unreal Engine 4 and the increase of frames per second(FPS) values verifies the feasibility of our optimization solution.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.287-288
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• 2006

CG and Photo-realistic image composition in the ocean scenes is frequently used in movies and TV advertisement. But it is very difficult task because it's impossible to use calibration tool in outdoor environment or to use auto-calibration algorithm using natural features like KLT(Kanade Lucas Tomasi feature tracker) from the ocean scene. We propose a simple, effective method for solving camera motion using previous knowledge about background structure. We applied our method to the production of a commercial movie, 'Hanbando' and the result was satisfactory.

• 한국멀티미디어학회논문지
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• 제22권1호
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• pp.99-109
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• 2019

Realistic rendering of natural phenomena is a difficult problem. Many environmental factors must be considered to simulate this phenomenon. At the same time, we need to think about their computational complexity to be simulated with computer algorithm One of the most difficult problems in creating weather conditions is the rain. To simulate realistic rainy scene, you have to consider the physical properties of rain and the environmental where the rain is falling down as well. In this paper, we survey the modeling and rendering techniques for realistic rainfall scenes from three different aspects. First, we list up techniques for modeling raindrop dynamics. Second, we survey the rendering techniques that render the raindrop in the environment. Third, we take a look at the hybrid methods that combines the rendering the modeling at the same time. For each aspect, we compare the algorithms in terms of implementation and their speciality.

• 한국의류산업학회지
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• 제5권5호
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• pp.481-494
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• 2003

The Gamrotenghwa of the Choson Dynasty is a unique genre of buddhist painting in that the destiny of the dead souls and the guidance to nirvana are expressed in reality. More than 50 of the Gamrotenghwa are known to be present, and the lower part of the paintings includes a wide assortment of folk customary scenes reflecting the social life style of the time when the painting was drawn, such as difficulties in life. public life, punishment and war. Changes in the costume of the people shown on the customary scenes of the Gamrotenghwa according to the time based changes in painting style were investigated in this study. The results are summarized in three points. First, the costumes of bureaucrats showed a tendency of preservation without any major changes in the painting. On the other hand, costumes of public and entertainer in the scenes were very close to those worn by the people at that time. The realistic description of public life in the painting may establish the value of the Gamrotenghwa as the historical documents. Second, the costume of the people in the painting showed a dual structure as the social positions; bureaucrats wore various official hats, large coats and belts to expose their social prestige. while the general public wore simple and convenient clothing which is divided into shirt and pants. The dual structure of the costume in the painting is in well accordance with that of the later period of Choson dynasty, suggesting that the customary scenes in the painting represent the social life style of the period. Finally, the customary scenes in the Gamrotenghwa are very variegated. which shows a variety of beauty of wearing even though they look coarse in a sense. The diversity of wearing beauty in the picture may contribute to the recreation of the beauty of shape in the new design of Hanbok.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.164.3-164
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• 2001

In this paper, we present a method for obtaining the actual modeling data through reconstructing a 3D data from an image and a method of estimating the geometrical information and the camera location of architectural objects from a photograph containing a virtual environment are introduced. Our approach combines both geometry-based and image-based modeling techniques. The modeling system is effective and robust because it exploits constrains that are characteristic of architectural scenes. Our approach can recover models for use in either geometry-based rendering systems. We present results that demonstrate out approach´s ability to create realistic renderings of architectural scenes from viewpoints far from the original photographs.

• 디자인학연구
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• 제11권2호
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• pp.71-81
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• 1998

도시의 옥외광고물은 직, 간접적으로 그 도시의 주체성 확립과, 가로경관을 형성하는데 가장 기본적인 요소로 인식되고 있다. 옥외광고물은 단순히 상업적 수단에 의해 출발하였지만 최근 들어서는 급속한 경제발전과 다양화된 사회구조 속에서 수많은 업종이 탄생하며, 그에 따라 광고물의 절대적인 종류와 양의 팽창을 가져오게 하였다. 이러한 양적 팽창은 새로운 도시환경 문제로 대두되게 되었으며 옥외광고물의 보다 더 효율적인 관리와 세련되고 합리적인 디자인이 필요하게 되었다. 따라서 본 연구를 통하여 가로경관이 향상될 수 있는 방향을 설정해 보고자 한다. 따라서 본 연구에서는 도시의 가로경관(Street Scenes of City), 옥외광고물(Outdoor Advertising Signs)의 개념과 특성 및 옥외광고물의 영향 등을 알아본 후 현황분석 에서는 현재 우리 나라 옥외광고물법과 외국 옥외광고물법의 특징을 조사 비교하여 보며 또한 도시경관에서 옥외광고물이 어떤 영향을 미치는지에 대한 조사를 실시하여 그 문제점을 도출한 후 옥외광고물의 디자인 관리정책 방향을 다음과 같이 제시하고자 한다. (1)도시의 환경 적, 경관 적 문제해결을 위하여 옥외광고물의 지역별 차별화 유도, (2)비현실적 광고물법은 변화하는 옥외광고물에 대응하기 위하여 개정이 필요함. (3)관리행정상의 문제는 옥외광고물 행정의 효율화를 통하여 해결해야 한다. (4)광고 제작업체의 문제는 장, 단기 계획으로 유도한다. (5)광고주 및 광고제작 업자의 경관의식과 공동의식 함양을 위하여 경관오염 징수 제를 실시하여야 한다. 이렇게 커다란 정책의 방향을 제시하여 도시경관의 향상과 지역 차별화를 유도하여 보다 더 아름다운 도시경관을 이루고자한다.

• International Journal of CAD/CAM
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• 제9권1호
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• pp.79-83
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• 2010

Tidal bore is a peculiar nature phenomenon which is caused by the lunar and solar gravitation. Based on the physical characters of tidal bores, in this paper we propose a novel method to model and render this phenomenon, especially the tidal waves in Qiantang estuary. According to Boltzmann equation for tidal waves, we solve it with the novel triangle mesh of Kinectic Flux Vector Splitting (KFVS) mode. Then a method combining a curve forecasting wave and particles model is proposed to render the dynamic scenes of overturning tidal waves. Finally, with some rendering technologies, various realistic tidal waves under diversified conditions is rendered in real time.

• 한국멀티미디어학회논문지
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• 제17권9호
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• pp.1104-1114
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• 2014

In large-scale crowd simulations, it is very important for the decision-making system of manipulating interactive behaviors to minimize the computational cost for controlling realistic behaviors such as collision avoidance. In this paper, we propose a large-scale realtime crowd simulation method using the affordance and navigation potential fields such as attractive and repulsive forces of electromagnetic fields. In particular, the model that we propose locally handles the realistic interactions between agents, and thus radically reduces the cost of expensive computation on interactions which has been the most problematic in crowd simulation. Our method is widely applicable to the expression and analysis of various crowd behaviors that are needed in behavior control in computer games, crowd scenes in movies, emergent behaviors of evacuation, etc.