• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.1239-1242
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• 1998

In television stereo system, to produce a realistic sound effect is very difficult because the distance between stereo speakers is very narrow. Many signal processing methods of widening the sound image for spatial impression have been studied. One of the methods of widening the sound image is using the Precedence Effect by reflected sound. However, this method does not work effectively in lower frequencies because of directivity of a speaker. In this paper, we propose an effective method of expanding stereo image using Precedence Effect and Phase Shifting method to produce a whole band frequency sound expansion. In experiments, we confirm the usefulness of the proposed stereo sound image expansion system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 B
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• pp.836-838
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• 1999

This paper describes stereo image compression algorithm using disparity and JPEG. because similar images are images with common features, similiar pixel distributions, and similar edge distributions. Fields such as medical imaging or satellite imaging often need to store large collections of similar images. that is, a conventional stereo system with a single left-right pair needs twice data as a monoscopic imaging system. as a result we need compression method compatible stereo image, in this paper after we use JPEG in basic compression method and stereo matching using adaptiv window, we get disparity information, we restored right image using by restored left image and disparity.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1997년도 춘계학술대회논문집
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• pp.207-212
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• 1997

In estimating the formability of sheet metal, the stereo vision system contributes the accuracy of strain of sheet metal, the convenience in measuring the strain of sheet metal, and the handiness in preparing the forming limit diagram by calculating the 3D values and strain of sheet metal. The algorithm has been developed so that the 3D-coordinate values of sheet metal could be calculated by image processing which is composed of camera calibration, and the stereo matching of images in two viewpoints. By comparing with experiments, the possibility and the convenience of algorithm has been verified, which could calculate the 3D-coordinate values of sheet metal automatically by using the preprocessing of the original image of sheet metal, which had the noise before adjusting the camera calibration and the stereo matching algorithm.

• Journal of Welding and Joining
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• 제19권2호
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• pp.200-207
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• 2001

Three-diemnsional bead profile was measured using the biprism stereo vision sensor in GMAW, which consists of an optical filter, biprism and CCD camera. Since single CCD camera is used, this system has various advantages over the conventional stereo vision system using two cameras such as finding the corresponding points along the horizontal scanline. In this wort, the biprism stereo vision sensor was designed for the GMAW, and the linear calibration method was proposed to determine the prism and camera parameters. Image processing techniques were employed to find the corresponding point along the pool boundary. The ism-intensity contour corresponding to the pool boundary was found in the pixel order and the filter-based matching algorithm was used to refine the corresponding points in the subpixel order. Predicted bead dimensions were in broad agreements with the measured results under the conditions of spray mode and humping bead.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.2729-2731
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• 2001

In this paper, we studied on the real-time environment map building for the mobile robot navigation using the stereo camera system. Distance measurement are necessary to build the environment map. We used a area-based stereo matching for the distance measurement with the stereo camera system. To reduce the computation time, we used DSP processor on the vision board, took a suitable area size for stereo matching, and used hierarchical search method. Using the fast acquired distance values, the environment map was built.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.777-780
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• 2003

We have tried to create a vision system like human eye for a long time. We have obtained some distinguished results through many studies. Stereo vision is the most similar to human eye among those. This is the process of recreating 3-D spatial information from a pair of 2-D images. In this paper, we have designed a stereo matching algorithm based on systolic array architecture using edges and pixel data. This is more advanced vision system that improves some problems of previous stereo vision systems. This decreases noise and improves matching rate using edges and pixel data and also improves processing speed using high integration one chip FPGA and compact modules. We can apply this to robot vision and automatic control vehicles and artificial satellites.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.293-293
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• 2010

In this paper, we propose a stereo vision based monitoring concept for passenger's safety on railroad platform. In general, basic concept of stereo image processing technique uses the correlations between left and right images, and extracts additional distance information. It provides easy removal of ambient illumination changes, which has been difficult to achieve with conventional 2D based image processing technique. In the paper, we present developed stereo camera and stereo vision based detection algorithm in order to monitor possible accidents at platform area, and verified the detection performance of proposed system with experimental results.

• 한국산학기술학회논문지
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• 제16권6호
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• pp.4108-4114
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• 2015

광학 반사체를 이용하여 카메라 영상을 얻는 방법을 catadioptric 영상법이라고 부른다. Catadioptric 영상법은 360도 모든 방향의 시각정보를 한 장의 영상면에 담기 위한 전방향 영상 획득시스템에 많이 사용된다. 대표적인 전방향 광학 반사체로서 그릇 모양의 3차원 쌍곡면형 거울이 있다. 본 논문에서는 쌍곡면형 반사체를 이용한 catadioptric 전방향 영상 시스템에 간단히 오목 렌즈를 추가함으로써 하나의 카메라로 시점이 다른 전방향 스테레오 영상을 얻는 방법에 관해 연구하였다. 시점이 다른 전방향 스테레오 영상 정합을 통해 대상 물체의 3차원 좌표를 복원할 수 있다. 본 전방향 스테레오 영상 시스템은 한 대의 카메라를 사용하므로 경제적이며, 스테레오 영상간에 카메라 내재 매개변수가 같으므로 정합이 쉽다는 장점이 있다. 본 논문에서는 3차원 좌표값 측정에 필요한 매개변수들을 3 단계 캘리브레이션을 이용하여 추출하였고, 실험을 통해 전방향 3차원 거리측정 성능을 검증하였다. 또한 거리측정 정밀도를 분석하여 본 스테레오 영상 시스템의 신뢰할 만한 측정범위를 제시하였다.

• 한국측량학회지
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• 제28권6호
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• pp.663-668
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• 2010

본 연구에서는 스테레오 디지털 카메라 장비를 제작하였고 이를 이용하여 현장에서 간편하게 디지털 영상만을 찰영한 후 영상처리를 통해 영상에 나타난 모든 대상물의 좌표 길이 등의 정보를 취득할 수 있다. 스테레오 디지털 카메라 장비를 이용하여 근거리 사진측량을 수행하는데 있어서 카메라 사이의 기선거리가 1m 정도로 제약을 받기 때문에 간편하게 외부표정요소가 미리 결정된 스테레오 영상을 취득할 수 있는 장점이 있지만 짧은 기선거리로 인해 정확도에는 제약을 받게 된다. 대상물에 대한 촬영 거리와 촬영 각도를 다양하게 설정하여 각각의 경우 발생하는 오차를 실험하였으며 영상측점의 오차가 마치는 영향도 분석하였다.

• 대한원격탐사학회지
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• 제23권5호
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• pp.401-408
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• 2007

Animated anaglyph is the most cost-effective method for 3D stereo visualization of virtual or actual 3D geo-based data model. Unlike 3D anaglyph scene generation using paired epipolar images, the main data sets of this study is the multi-typed 3D feature model containing 3D shaped objects, DEM and satellite imagery. For this purpose, a prototype implementation for 3D animated anaglyph using OpenGL API is carried out, and virtual 3D feature modeling is performed to demonstrate the applicability of this anaglyph approach. Although 3D features are not real objects in this stage, these can be substituted with actual 3D feature model with full texture images along all facades. Currently, it is regarded as the special viewing effect within 3D GIS application domains, because just stereo 3D viewing is a part of lots of GIS functionalities or remote sensing image processing modules. Animated anaglyph process can be linked with real-time manipulation process of 3D feature model and its database attributes in real world problem. As well, this approach of feature-based 3D animated anaglyph scheme is a bridging technology to further image-based 3D animated anaglyph rendering system, portable mobile 3D stereo viewing system or auto-stereo viewing system without glasses for multi-viewers.