• 한국콘텐츠학회논문지
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• 제11권1호
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• pp.92-101
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• 2011

21세기 기술 혁신으로 3D 디스플레이 기술 및 3D 영상 기술은 새로운 트랜드로 주목 받고 있다. 그러나 3D 입체 영상을 직접 제작하기 위해서는 고가의 제작비용과 전문적인 기술이 필요하다. 3D 디스플레이 장치가 일반화 되면서 사용자 고가의 비용 부담 없이 3D 입체 영상을 구현할 필요성이 증대되고 있다. 본 논문은 싱글 카메라를 이용한 마커 인식 기술을 사용하여 3D 입체 영상을 용이하게 구현 할 방법을 제시하였다. 또한 영상의 해상도를 동적으로 조절가능하게 하였다. 본 논문은 3D 입체 영상 구현 분야에 일반 사용자의 적극적인 참여를 유도하여 3D 입체 영상을 이용한 UCC(User Created Contents) 분야의 활성화에 기여할 것이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.337-339
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• 2005

The demand for a real-time image surveillance system using network camera server is increasing as the network infra has been grown and digital video compression techniques have been developed. The image surveillance system using network camera server has several merits compared to existing real-time image surveillance system using CCTV. It would be more convenient if wireless realtime image transmission were possible. In this paper, a bluetooth module is designed and implemented for a real-time image surveillance system to send and receive informations wirelessly. It may simplify the system development procedures and increase the productivity by low power consumption, low cost, and simple wireless installation. A scatter-net formation is proposed using dynamic and distributed algorithm so that the network connection is reliable.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 1998년도 춘계종합학술대회
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• pp.351-358
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• 1998

This paper deals with the underwater image transmission system which includes in AUV(Autonomous Underwater Vehicle) Project(that is VORAM(Vehicle for Ocean Research And Monitoring)), developed by KIMM for survey and investigation of a sea-bed through transmitting the underwater image to the mother ship. The system presented in this paper consists of a transducer which has a 136KHz center frequency and it's 10KHz bandwidth, pre-amplifier, $\pi$/4 QPSK(Quadreature Phase Shift Keying) modulation/demodulation method, image compressing method using JPEG technique and modified Stop & protocol. The experimental results of the system is verified to a high performance with 9600 bps for transmitting the underwater image through the basin test. The results of test are also verified which allows to desirable transmission performance compared with the existing developed system and the possibility to put the practical use of survey and investigation. And, the viterbi coding and adaptive equalizer for cancelling the multipath effect are developing for more effective image transmission system. Also, these technique will very effectively adapt to realtime image transmission system.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2010년도 춘계 종합학술대회 논문집
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• pp.31-33
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• 2010

본 논문에서는 전력선통신(Power Line Communication : PLC)을 이용하여 고열, 고압등 매우 열악한 작업 환경에서 작업자의 상황을 실시간 관리 할 수 있는 영상 송수신시스템을 설계 및 구현하였다. 시스템 설계의 중점 고려사항으로 단순화 구조의 적용, 설치 및 이동의 용이성 뿐만 아니라 고열이나 고압 등을 충분히 견딜 수 있고 다양한 노이즈 환경에서도 깨끗한 영상을 전송 할 수 있는 측면에 역점을 두었다.

• 한국환경과학회지
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• 제23권12호
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• pp.2121-2127
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• 2014

Analyzing the observational data of volcanic activities around the northern part of Korean peninsula, the odds of volcano eruption increases continuously. For example, the cumulative seismic moment and frequence observed near Mt. Baekdu show a sudden increased values. In this study, predicting the diffusion of volcanic ash for two cases were carried out by using interactive realtime simulator, which was developed during last 2 years as a research and development project. The first case is Sakurajima volcano (VEI=3) erupted in August 2013. The second case is assumed as the volcanic eruption at Mt. Baekdu (VEI=7) under landing circumstance of typhoon Maemi (August 2003) in Korean peninsula. The synoptic condition and ash diffusion for the two cases were simulated by WRF(Weather Research and Forecast) model and Lagrangian dispersion model, respectively. Comparing the simulated result of the first case (i.e., Sakurajima volcano) with satellite image, the diffusion pattern show acceptable result. The interactive realtime simulator can be available to support decision making under volcanic disaster around East Asia by predicting several days of ash dispersion within several minutes with ordinary desktop personal computer.

• 한국인터넷방송통신학회논문지
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• 제11권6호
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• pp.311-317
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• 2011

본 논문에서는 입력된 영상에서 나타나는 세 가지 대표적인 잡음 영상인 안개 낀 영상, 저조도 영상, 역광 영상에 대한 개선 방안을 제시하였다. 기존의 안개영상 개선 알고리즘은 성능이 뛰어나지만 메모리 사용량과 계산량이 많아지는 문제점을 가지고 있다. 본 논문에서는 성능이 뛰어난 안개 제거 알고리즘의 메모리 사용량과 계산 량을 줄이는 개선된 방법을 제안하고, 이를 DM6446 DSP칩으로 구현하였으며, 제안한 방법을 이용하여 저조도 영상 개선 및 WDR에 적용시킬 수 있는 방법을 제안하였다. 실험결과 DSP 칩에 적용했을 때 초당 15화면을 처리하였다. 또한 구현한 결과 영상은 속도를 개선하기 전의 알고리즘과 거의 동일한 화질을 보였다.

• 한국방사선학회논문지
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• 제10권8호
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• pp.637-643
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• 2016

최근 인공지능에 대중의 관심으로 인해, 인공신경망을 사용한 의료영상 처리가 학계와 산업계에서 관심이 커져가고 있다. 딥러닝을 이용한 컨볼루션 신경망은 영상을 효과적으로 표현할 수 있는 것으로 증명되었다. 그러나 학습을 위해서는 고성능 H/W 플랫폼이 요구된다. 따라서 고차원의 많은 학습 샘플을 저사양 H/W 플랫폼에서 학습하는 것은 매우 도전적인 문제이다. 본 논문에서는 온라인 인공 신경망을 사용해 라즈베리파이에서 동작할 수 있는 실시간 신경망 알고리즘을 제안하고자 한다. 다양한 실험 결과를 통해 제안된 방법은 실시간 학습이 가능함을 보여주었다.

• 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.

• 로봇학회논문지
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• 제10권3호
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• pp.146-153
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• 2015

In order to contain as much information as possible in a single image, a wide FOV(Field-Of-View) imaging system is required. The catadioptric imaging system with hyperbolic cylinder mirror can acquire over 180 degree horizontal FOV realtime panorama image by using a conventional camera. Because the hyperbolic cylinder mirror has a curved surface in horizontal axis, the original image acquired from the imaging system has the geometrical distortion, which requires the image processing algorithm for reconstruction. In this paper, the image reconstruction algorithms for two cases are studied: (1) to obtain an image with uniform angular resolution and (2) to obtain horizontally rectilinear image. The image acquisition model of the hyperbolic cylinder mirror imaging system is analyzed by the geometrical optics and the image reconstruction algorithms are proposed based on the image acquisition model. To show the validity of the proposed algorithms, experiments are carried out and presented in this paper. The experimental results show that the reconstructed images have a uniform angular resolution and a rectilinear form in horizontal axis, which are natural to human.