• Journal of the Korea Society of Computer and Information
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• v.13 no.1
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• pp.21-27
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• 2008

The man who wants to create advance user created contents Is in need of using chroma-key method in a certain environment. Recently. pavilion that is painted with mono-color is used for the application of chroma-key. This paper aims to introduce a robust automatic adaptive chroma-key method without using pavilion. In this research. a new chroma-key method is applied to the separation of high frequency and low frequency using Wavelet is done in order that the noise can be eliminated. As a result, a chroma-key method with good capacity is shown from the research.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.159-160
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• 2015

본 논문에서는 사용자의 제스처를 인식하여 동작하는 비 접촉식 크로마키 시스템을 제안한다. 이를 위해서 키넥트 카메라로부터 깊이(depth) 이미지와 RGB 이미지를 입력받는다. 먼저 깊이 카메라와 RGB 카메라의 위치 차이로 인한 불일치(disparity)를 보정하고, 깊이 이미지에 대해 모폴로지 연산을 수행하여 잡음을 제거한 후 RGB 이미지와 결합하여 객체 영역을 추출한다. 추출된 객체영역을 분석하여 사용자 손의 위치와 모양을 인식하고 손의 위치와 모양을 포인팅 장비로 간주하여 크로마키 시스템을 제어한다. 실험을 통해 비접촉식 크로마키 시스템이 실시간으로 동작함을 확인하였다.

• Journal of the Korea Convergence Society
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• v.8 no.7
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• pp.7-13
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• 2017

Robot performances in public places are conducted for the purpose of promoting robot technology and inducing interest in events, exhibitions, and streets instead of dedicated stages. This paper extracts robot images in real time from a robot operation in front of a green chroma key cloth, and synthesizes them on various stage images. A simple and robust method for extracting a foreground robot from a chroma key background without a user's preset is proposed. After increasing the color difference between the background and the foreground, this method automatically removes the background based on the histogram of the difference information, thereby eliminating the need for a user's preset. The simulation shows 98.8% of foreground extraction rate and experimental results demonstrate that the robots can effectively be extracted from the background.

• Journal of agriculture & life science
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• v.51 no.1
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• pp.205-212
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• 2017

This study aimed to output augmented reality display using chroma-key so that power tiller simulator can be operated smoothly while wearing the head mounted display. In this paper, we propose a chroma-eliminating image filtering method. Experimental results show that the maximum and minimum values of hue, saturation and intensity were 0.52, 0.153, 0.57, 0.16, 1, and 0.12, respectively. A keypad was used to set the initial position of augmented reality adjusted with the front, back, top, bottom, left, and right buttons. The initial position value is always maintained and managed according to the trailer attachment and detachment. Finally, we show that the augmented reality merged with virtual image and the acquired image of operation device using coordinate values obtained from the HMD and the position tracking sensor as relative coordinates in Unity program that is the ultimate game development platform.

• Journal of the Korea Convergence Society
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• v.12 no.10
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• pp.1-8
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• 2021

In online meetings and classes using webcams, the chromakey technique is a very necessary part to produce content. We proposed a technology that enables background synthesis without using a cloth for chromakey. The proposed method consists of three steps: an HSI image conversion step, a step of detecting a region changed from a background, and a step of replacing the background region with a chromakey and applying it. In the input video, the block average image of each frame is calculated, and the difference between the block average image of the background image and the block average image of the input image is used to detect the change area. The developed chromakey effect technology uses a technique of acquiring a background image without an object from a single camera and extracting only an object by distinguishing the moving object and the background. The proposed method is not only capable of processing even if the background has a variety of colors, but also has the seamless processing of the boundary lines of objects.

• Journal of Satellite, Information and Communications
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• v.7 no.2
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• pp.36-41
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• 2012

In this paper we have compared three materials which are used for background chromakey in virtual studio. Each material reflects the illumination in different ways. In our experimental comparison, the 'chromatte' have the best quality in making good background image. Without predetermined light condition, chromatte provides wide range of adaptability.

• The Journal of the Korea Contents Association
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• v.13 no.5
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• pp.451-458
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• 2013

In this paper, we have developed an intellectual sizing and fitting system for bike user. In order to prevent the disease, we should adjust the bike's frame and select several components in the body size. Then it propose an extractions algorithm of avatar imagination with the cromakey method and realize the sizing and fitting.

• Journal of Korea Game Society
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• v.20 no.4
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• pp.11-20
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• 2020

In the rapidly changing mobile app market, it is crucial to develop a good idea quickly and receive its market evaluation. For a small-sized company, however, it is very challenging to rapidly develop and deploy their products in response to highly fragmented mobile environments. This article demonstrates that our integrated development environment using both React Native and Unity3D when developing a mobile app achieves a high level of functionality and performance requirements successfully. Moreover, this integrated environment helps reduce development costs and shorten development time.

• The Journal of the Convergence on Culture Technology
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• v.8 no.3
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• pp.313-321
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• 2022

As 5G is getting developed, people are getting interested in immersive content. Some predicts that immersive content may be implemented in real life such as holograms, which were only possible in movies. Holograms, which has been studied for a long time since Dennis Gabor published the basic theory in 1948, are constantly developing in a new direction with digital technology. It is developing from a traditional optical hologram, which is produced by recording the interference pattern of light to a computer generated hologram (CGH) and a digital hologram printer. In order to produce a hologram using a digital hologram printer, holographic element (Hogel) image must first be created using multi-view images. There are a method of directly photographing an actual image and a method of modeling an object using 3D graphic production tool and rendering the motion of a virtual camera to acquire a series of multi-view images. In this paper, we propose a new method of getting image, which is one of the visual effect, VFX, producing multi-view images using chroma key composition. We shoot on the green screen of actual object, suggest the overall workflow of composition with 3D computer graphic(CG) and explain the role of each step. We expected that it will be helpful in researching a new method of image acquisition in the future if all or part of the proposed workflow to be applied.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2001.11b
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• pp.205-208
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• 2001

최근 스포츠 중계를 중심으로 가상광고가 큰 주목을 받고 있다. 가상광고는 현실에 존재하지 않는 광고를 실영상 내에 삽입하여 마치 실제로 존재하는 물체처럼 보여주는 기술이다. 본 논문에서는 한 대의 카메라로 촬영한 영상으로부터 실시간으로 특징점 추출 및 추적을 행하여, 카메라 Projection 행렬을 복원하고, 이를 이용하여 범용적인 크로마키(chroma-key) 기법으로 영상합성 함으로써 센서와 같은 부가장비가 필요없는 영상기반의 가상광고 시스템을 구현하였다. 일반 PC상에서 알고리즘의 유효성과 실시간 동작성을 확인하였다.