• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.2407-2410
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• 2003

In this paper, we propose a new stereoscopic video conversion methodology that converts two-dimensional (2-D) MPEG-4 video to stereoscopic video. In MPEG-4, each Image is composed of background object and primary object. In the first step of the conversion methodology, the camera motion type is determined for stereo Image generation. In the second step, the object-based stereo image generation is carried out. The background object makes use of a current image and a delayed image for its stereo image generation. On the other hand, the primary object uses a current image and its horizontally-shifted version to avoid the possible vertical parallax that could happen. Furthermore, URFA(Uncovered Region Filling Algorithm) is applied in the uncovered region which might be created after the stereo image generation of a primary object. In our experiment, show MPEG-4 test video and its stereoscopic video based upon out proposed methodology and analyze Its results.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 추계학술대회
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• pp.147-148
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• 2010

Recently, advancement in the visual technology has lead to the further development of the three dimensional (3D) imaging systems. The visual perception to view a pair of images simultaneously, is a crucial factor to build a stereoscopic 3D image. In this paper, we present the depth cues between the intensities of the two images when viewing with both eyes. Due to this stereoscopic effect, objects at different distances from the eyes differ in their horizontal positions, giving the depth cue of horizontal disparity. By simple image processing technique, we also present the binocular disparity map between the two images. A median filter has been used to filter out all the noises occurring in the disparity map image.

• 한국콘텐츠학회논문지
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• 제12권10호
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• pp.63-71
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• 2012

입체영상은 공간에 대한 정확한 깊이인식을 기본으로 하며, 공간 디자인 및 인지과학 등의 다양한 차원에서 접근해야 한다. 특히 휴먼 팩터(human factor)를 고려한 인간공학적 설계가 중요하다. 즉, 입체영상설계자는 양안시차를 결정할 때, 인간의 눈과 카메라 시점을 일치시켜야 한다. 이 과정에서 광학적(dichoptic) 오차에 의한 왜곡 등의 구조적인 문제가 발생하며, 이를 해결하기 위해 기하학의 재해석 및 인간공학적 설계를 기반으로 시각 피로를 최소화하는 3D 스위트닝(sweetening)과정이 요구된다. 본 연구는 입체영상의 근본적인 불일치 문제를 실험영상의 제작을 통해 분석하고, 생체 안정성과의 상관관계를 파악한다. 이를 통해 인간공학적 설계에 기초한 다양한 입체영상의 공간 연출 방법을 제안한다.

• 한국멀티미디어학회논문지
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• 제11권6호
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• pp.746-754
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• 2008

A 3D stereoscopic image is generated by interdigitating every scene with video editing tools that are rendered by two cameras' views in 3D modeling tools, like Autodesk MAX(R) and Autodesk MAYA(R). However, the depth of object from a static scene and the continuous stereo effect in the view of transformation, are not represented in a natural method. This is because after choosing the settings of arbitrary angle of convergence and the distance between the modeling and those two cameras, the user needs to render the view from both cameras. So, the user needs a process of controlling the camera's interval and rendering repetitively, which takes too much time. Therefore, in this paper, we will propose the 3D stereoscopic image editing system for solving such problems as well as exposing the system's inherent limitations. We can generate the view of two cameras and can confirm the stereo effect in real-time on 3D modeling tools. Then, we can intuitively determine immersion of 3D stereoscopic image in real-time, by using the 3D stereoscopic image preview function.

• Journal of Advanced Marine Engineering and Technology
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• 제39권10호
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• pp.1011-1016
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• 2015

Gas piping systems in power plants and factories are always influenced by the mechanical vibrations of rotational machines such as pumps, blowers, and compressors. Unusual vibrations in a gas piping system influence possible leakages of liquids or gases, which can lead to large explosive accidents. Real-time measurements of unusual vibrations in piping systems in situ prohibit them from being possible leakages owing to the repeated fatigue of vibrations. In this paper, a non-contact 3-dimensional measurement system that can detect the vibrations of a solid body and monitor its vibrational modes is introduced. To detect the displacements of a body, a stereoscopic camera system is used, through which the major vibration types of solid bodies (such as X-axis-major, Y-axis-major, and Z-axis-major vibrations) can be monitored. In order to judge the vibration types, an artificial neural network is used. The measurement system consists of a host computer, stereoscopic camera system (two-camera system, high-speed high-resolution camera), and a measurement target. Through practical application on a flat plate, the measured data from the non-contact measurement system showed good agreement with those from the original vibration mode produced by an accelerator.

• 한국산업정보학회논문지
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• 제13권1호
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• pp.11-21
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• 2008

최근 디지털 영상 미디어의 발전으로 인해 3차원 입체 콘텐츠에 대한 관심이 높아지고 있다. 이로 인해 3차원 입체 콘텐츠 생성에 대한 많은 기술들이 연구 개발되고 있다. 하지만 자연스럽고 몰입감이 높은 3차원 입체 콘텐츠 생성하는데 많은 어려움이 있다. 왜냐하면 2차원 영상에서는 3차원의 기하정보가 존재하지 않아 입체 콘텐츠 생성이 매우 어렵기 때문이다. 그리고 입체 카메라 생성 시 몰입감이 높은 입체 시점을 결정하기 위해 반복적인 저작 과정이 필요하다. 따라서 본 논문에서는 다양한 형태의 영상들을 이용하여 3차원 입체 콘텐츠 제작을 위한 통합형 저작 시스템을 제안한다. 이를 위해 영상 기반 모델링 기법을 활용하여 영상 내에 존재하는 사영 기하 정보를 통해 3차원 모델을 생성한다. 그리고 3차원 입체 카메라 생성 시 몰입감이 높은 입체 영상의 시점을 결정하기 위해 실시간 대화식 입체 영상 미리보기 기능을 제공한다.이때 입체 모니터와 편광 필터 안경을 통해 직관적으로 고품질의 입체 콘텐츠를 생성한다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2001년도 추계종합학술대회
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• pp.592-595
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• 2001

원거리에서 무접촉 거리 계측(ranging)은 군용 장비나 건설, 항해, 자동화 등에 매우 중요하다. 계측방식은 active와 passive 방식으로 구분되는데, active방식은 laser나 microwave, 초음파 등의 time of flight를 이용하거나 레이저 조사(illumination)에 대한 카메라 영상을 해석하는 등의 다양한 방식이 있으나 장치가 복잡하고, passive 방식은 stereo camera의 양안 영상을 이용하거나 focus 특성을 이용하는 방식 등이 있으나 대부분 연산 시간이 많이 요구된다. 본 연구에서는 수동식 스테레오 카메라에서 양안시차를 추출하여 triangulation으로 목표점(target point)의 거리를 측정하는 것을 기본 방식으로 하여, 기존 거리 산출 방식에서 연산 시간이 많이 소요되는 연산 과정을 효율적이고 고속으로 수행할 수 있도록 새로운 방식을 제안하였다. 즉, 목표점에서의 양안 edge 영상을 구하며, 이 영상의 accumulation profile을 correlation하여, 거리 연산의 핵심 요소인 양안 시차를 고속으로 추출하는 알고리즘을 제안하였다. 또한, 제안 방식의 효율성을 실험 결과를 통하여 보였다.

• 대한기계학회논문집B
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• 제27권11호
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• pp.1637-1644
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• 2003

Stereoscopic particle image velocimetry is a measurement technique to acquire three dimensional velocity field by two cameras. With a laser sheet illumination, the third velocity component can be deduced from out-of$.$plane velocity components using a stereoscopic matching method. Most industrial fluid flows are three dimensional turbulent flows, so it is necessary to use the stereoscopic PIV measurement method. However the existing stereoscopic PIV system seems hard to use since it is very expensive and complex. In this study we have developed a Miniature Stereo-PIV(MSPIV) system based on the concept of the Miniature PIV system which we have already developed. In this paper, we address the design and some primitive experimental results of the Miniature Stereo-PIV system. The Miniature Stereo-PIV system features relatively modest performances, but is considerably smaller, cheaper and easy to handle. The proposed Miniature Stereo-PIV system uses two one-chip-only CMOS cameras with digital output. Only two other chips are needed, one for a buffer memory and one for an interfacing logic that controls the system. Images are transferred to a personal computer (PC) via its standard parallel port. No extra hardware is required (in particular, no frame grabber board is needed).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.484-486
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• 2005

Passenger safety is a primary concern of railway system but, it has been urgent issue that dozens of people are killed every year when they falloff from train platforms. Recently, advancements in IT have enabled applying vision sensors to railway environments, such as CCTV and stereo camera sensors. In this paper, we propose a stereoscopic video coding scheme for subway accident monitoring system. The proposed scheme is designed for providing flexible video among various displays, such as control center, station employees and train driver. We uses MPEG-2 standard for coding the left-view sequence and IBMDC for predicting the P- and B-types of frames of the right-view sequence. IBMDC predicts matching block by interpolating both motion and disparity predicted macroblocks. To provide efficient stereoscopic video service. we define both temporally and spatially scalable layers for each eye's-view by using the concept of Spatio-Temporal scalability. According to the experimental results. we expect the proposed functionalities will play a key role in establishing highly flexible stereoscopic video codec for ubiquitous display environment where devices and network connections are heterogeneous.

• 한국광학회:학술대회논문집
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• 한국광학회 2006년도 동계학술발표회 논문집
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• pp.289-290
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• 2006