• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.895-898
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• 2002

In this paper, we propose a 3D image player for LCD monitors as well as CRT monitors. As we consider an afterglow and digital processing of LCD monitors, a stereoscopic images can be shown on CRT monitors as well as LCD monitors using the proposed a3D image player. We have implemented a 3D image player using FPGA (MAX 9320), We show prove that a stereoscopic images are shown on the LCD monitors.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2019년도 추계학술발표대회
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• pp.28-30
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• 2019

본 논문은 3차원으로 복원된 데이터를 원격지에 있는 홀로렌즈에 실시간으로 전달하기 위해 개발된 중계서버 시스템을 제안한다. 원격지에 있는 홀로렌즈를 위한 실시간 전송 시스템 구축을 위해서는 복원된 3차원 데이터의 압축 스트림을 복호화 해주는 중계서버 시스템이 필요하다. 이와 같은 3차원 데이터의 구조와 원격지에서 데이터를 전달 받는 홀로렌즈 환경을 고려하여 중계서버 시스템을 설계하고 구축 했다.

• 융합신호처리학회논문지
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• 제4권3호
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• pp.27-33
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• 2003

영상 기반 3차원 모델링은 카메라로부터 획득된 영상을 입력으로 하여 3차원 그래픽 모델을 생성하는 기술로 고가형 3D 스캐너의 대체 기술로 연구되어지고 있다 본 논문에서는 스테레오 보정 카메라를 이용한 영상 기반 3차원 모델링 시스템을 제안한다. 3차원 모델을 생성하기 위한 제안 알고리즘은 카메라 보정 단계, 3차원 좌표 복원 단계 3차원 좌표 등록 단계로 이루어진다. 카메라 보정 단계에서는 영상 획득용 카메라에 대한 카메라 행렬을 계산하며 3차원 좌표 복원 단계에서는 스테레오 영상의 일치점으로부터 삼각측량법에 의해 3차원 좌표를 복원한다. 3차원 좌표 등록 단계에서는 개별적으로 복원된 3차원 좌표의 단일 모델을 생성하기 위한 기준 좌표로의 변환을 추정하여 최종 3차원 모델을 생성한다 실험 결과 제안 알고리즘이 비교적 정확하게 .B차원 모델을 생성함을 확인하였다.

• 한국산학기술학회논문지
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• 제9권6호
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• pp.1569-1573
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• 2008

본 논문은 핵발전소 증기발생기의 초음파 비파괴 검사용 프로그램 개발에 관한 것이다. 개발된 프로그램은 A, B, C, D-스캔과 같은 고전적인 해석방법뿐만 아니라 3차원 영상처리 기법을 이용하여 증기발생기 내부에 발생한 결함을 해석하고 검출할 수 있다. 결함의 3차원 영상은 핵발전소의 파이프라인으로부터 얻어진 1차원 초음파 데이터를 EMD(Empirical Mode Decomposition)로 분석해 결함의 위치를 구하고 voxel을 이용하여 구현하였다. 얻어진 3차원 영상은 2차원 해석방법을 사용하지 않더라도 결함의 위치, 형태, 크기 등과 같은 유용한 정보를 얻는데 용이하다. 개발된 프로그램은 이미 결함의 위치 및 모양, 크기 등을 알고 있는 시편의 측정에 사용하여 프로그램의 정확성을 검증하였고, 3차원 영상으로 결함의 입체적 모양을 구현하였다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.751-754
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• 2009

This paper deals with the Cell-based distributed processing for generating free viewpoint images by merging multiple differently focused images. We previously proposed the method of generating free viewpoint images without any depth estimation. However, it is not so easy to realize real-time image reconstruction based on our previous method. In this paper, we discuss the method to reduce the processing time by dimension reduction for image filtering and Cell-based distributed processing. Especially, the method of high-speed image reconstruction by the Cell processor on SONY PLAYSTATION3(PS3) is described in detail. We show some experimental results by using real images and we discuss the possibility of real-time free viewpoint image reconstruction.

• Journal of Information Display
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• 제3권3호
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• pp.12-16
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• 2002

We first review a real-time three-dimensional (3-D) holographic recording technique called optical scanning holography (OSH) and discuss holographic reconstruction using spatial light modulators (SLMs). We then present how the overall system can be used for 3-D holographic television (TV) display with a wide-angle view of a 3-D image, and address some of the issues encountered. Finally, we suggest some techniques to alleviate the issues encountered in such a 3-D holographic TV system.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.80-83
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• 1999

An efficient modeling and management of a large amount of surface data for a wide rage of geographic information play an important role in determining the functionality of 3D geographic information system. It has been put many efforts to design and manage an effective way to enhence the manipulation of the data by considering geometry type and data structures. Recently, DEM(Data Elevation Model) and TIN(Triangulated Irregular Network) are used for representing surface data. In this paper, we propose a 3D data processing method. The method utilizes the major properties of DEM and TIN, respectively. Furthermore, by approximating DEM with a TIN of an appropriate resolution, we can support a fast and realistic surface modeling. We implement the structure with the following 4 level stages. The first is an optimal resolution of DEM which represent all of wide range of geographic data. The second is the full resolution DEM which is a subarea of original data generated by user's selection in our implemeatation. The third is the TIN approximation of this data with a proper resolution determined by the relative position with the camera. And the last step is multi-resolution TIN data whose resolution is dynamically decided by considering which direction user take notice currently. Specially, the TIN of the last step is designed for realtime camera navigation. By using the structure we implemented realtime surface clipping, efficient approximation of height field and the locally detailed surface LOD(Level of Detail). We used the initial 10-meter sampling DEM data of Seoul, KOREA and implement the structure to the 3D Virtual GIS based on the Internet.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 1999년도 추계학술대회 발표요약문
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• pp.66-71
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• 1999

For given 3D geographic data which is usually of DEM(Data Elevation Model) format, we have to represent and manipulate the data in various ways. For example, we have to draw a part of them in drawing canvas. To do this we give users a way of selecting area they want to visualize. And we have to give a base tool for users to select the local area which can be chosen for some geographic operation. In this paper, we propose a 3D data processing method for representation and manipulation. The method utilizes the major properties of DEM and TIN(Triangular Irregular Network), respectively. Furthermore, by approximating DEM with a TIN of an appropriate resolution, we can support a fast and realistic surface modeling. We implement the structure with the following 4 level stages. The first is an optimal resolution of DEM which represent all of wide range of geographic data. The second is the full resolution DEM which is a subarea of original data generated by user's selection in our implemeatation. The third is the TIN approximation of this data with a proper resolution determined by the relative position with the camera. And the last step is multi-resolution TIN data whose resolution is dynamically decided by considering which direction user take notice currently. Specialty, the TIN of the last step is designed for realtime camera navigation. By using the structure we implemented realtime surface clipping, efficient approximation of height field and the locally detailed surface LOD(Level of Detail). We used the initial 10-meter sampling DEM data of Seoul, KOREA and implement the structure to the 3D Virtual GIS based on the Internet.

• 전자통신동향분석
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• 제35권5호
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• pp.112-122
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• 2020

In 3D computer graphics, a depth map is an image that provides information related to the distance from the viewpoint to the subject's surface. Stereo sensors, depth cameras, and imaging systems using an active illumination system and a time-resolved detector can perform accurate depth measurements with their own light sources. The 3D image information obtained through the depth map is useful in 3D modeling, autonomous vehicle navigation, object recognition and remote gesture detection, resolution-enhanced medical images, aviation and defense technology, and robotics. In addition, the depth map information is important data used for extracting and restoring multi-view images, and extracting phase information required for digital hologram synthesis. This study is oriented toward a recent research trend in deep learning-based 3D data analysis methods and depth map information extraction technology using a convolutional neural network. Further, the study focuses on 3D image processing technology related to digital hologram and multi-view image extraction/reconstruction, which are becoming more popular as the computing power of hardware rapidly increases.

• Journal of Biosystems Engineering
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• 제26권3호
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• pp.279-286
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• 2001

The purpose of this study were to organize a sorting system, to develop an algorithm of image processing for the shape sorting, and to finally develop a scientific and objective shape sorting system of Korean Red-Ginseng for mechanization of the shape sorting. The results of this study are followed. 1. The shape sorting system of Korean Red-Ginseng consists of a control computer, a color CCD camera(WV-CP4110) for image processing, an image processing board(DT3153), and an image acquisition unit. 2. Many image processing skill, such as sliding, stretching, threshold, binary and D$\sub$t/ were used to analyze the shape sorting factors of Korean Red-ginseng. 3. The sorting accuracy of the shape sorting system for the Korean Red-Ginseng was 74.7%. It is 21.1% lower than that of human inspector. Although the system has low accuracy, using more cameras may improve its sorting accuracy.