• Title/Summary/Keyword: 위치 좌표 값

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A Study on the Coordinate-based Intersection ID Composition System Using Space Filling Curves (공간 채움 곡선을 활용한 좌표 기반의 교차로 ID 구성 체계에 관한 연구)

  • Lee, Eun il;Park, Soo hong;Kim, Duck ho
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.18 no.6
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    • pp.124-136
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    • 2019
  • Autonomous driving at intersections requires assistance by exchanging traffic information between traffic objects due to the intersection of various vehicles and complicated driving environment. For this reason, traffic information exchange between adjacent intersections is required, but the node ID representing the intersection in the Korean standard node link system have limitations in updating intersections and identifying location information of intersections through IDs due to the configuration system including serial numbers. In this paper, we designed a coordinate-based intersection ID configuration system created by processing and merging two-dimensional coordinates of intersections to include location information in the intersection ID. In order to verify the applicability of the proposed intersection ID, we applied a new intersection ID to domestic intersections and confirmed that there are no duplicate values. Coordinate-based intersection ID reduces data size by 60% compared to existing node ID, and enables spatial queries such as searching for nearby intersections and extracting intersections in specific areas in the form of boxes without GIS tools. Therefore, coordinate-based intersection ID is expected to be more scalable and utilized than existing node ID.

Smart Platform Design for Location based Drama Contents Services (위치기반의 드라마 콘텐츠서비스용 스마트 플랫폼 설계)

  • Choi, Youngho
    • Journal of Internet Computing and Services
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    • v.18 no.1
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    • pp.37-41
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    • 2017
  • In this paper, a platform was proposed that can service the streaming of location based real-time video-clip for smart-travel-services to work with PPL(Product Placement). The location information of drama like as LTE GPS and Beacon were used to provide the drama video with the PUSH service. And PPL DB with the attributes like as picture, video, music and URI(Uniform resource Identifier) was designed. As a result, this platform could provide the location based video streaming service that could replace the original PPL properties, color or shape, with the other properties by the interactive tagging the PPL DB in drama scenes. The proposed platform could provide the location based real-time video streaming service that can alter the PPL properties with the request of service provider.

A Study on Object Tracking for Autonomous Mobile Robot using Vision Information (비젼 정보를 이용한 이동 자율로봇의 물체 추적에 관한 연구)

  • Kang, Jin-Gu;Lee, Jang-Myung
    • Journal of the Korea Society of Computer and Information
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    • v.13 no.2
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    • pp.235-242
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    • 2008
  • An Autonomous mobile robot is a very useful system to achieve various tasks in dangerous environment, because it has the higher performance than a fixed base manipulator in terms of its operational workspace size as well as efficiency. A method for estimating the position of an object in the Cartesian coordinate system based upon the geometrical relationship between the image captured by 2-DOF active camera mounted on mobile robot and the real object, is proposed. With this position estimation, a method of determining an optimal path for the autonomous mobile robot from the current position to the position of object estimated by the image information using homogeneous matrices. Finally, the corresponding joint parameters to make the desired displacement are calculated to capture the object through the control of a mobile robot. The effectiveness of proposed method is demonstrated by the simulation and real experiments using the autonomous mobile robot.

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3D Visualization using Face Position and Direction Tracking (얼굴 위치와 방향 추적을 이용한 3차원 시각화)

  • Kim, Min-Ha;Kim, Ji-Hyun;Kim, Cheol-Ki;Cha, Eui-Young
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.10a
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    • pp.173-175
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    • 2011
  • In this paper, we present an user interface which can show some 3D objects at various angles using tracked 3d head position and orientation. In implemented user interface, First, when user's head moves left/right (X-Axis) and up/down(Y-Axis), displayed objects are moved towards user's eyes using 3d head position. Second, when user's head rotate upon an X-Axis(pitch) or an Y-Axis(yaw), displayed objects are rotated by the same value as user's. The results of experiment from a variety of user's position and orientation show good accuracy and reactivity for 3d visualization.

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Realistic 3D Scene Reconstruction from an Image Sequence (연속적인 이미지를 이용한 3차원 장면의 사실적인 복원)

  • Jun, Hee-Sung
    • The KIPS Transactions:PartB
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    • v.17B no.3
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    • pp.183-188
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    • 2010
  • A factorization-based 3D reconstruction system is realized to recover 3D scene from an image sequence. The image sequence is captured from uncalibrated perspective camera from several views. Many matched feature points over all images are obtained by feature tracking method. Then, these data are supplied to the 3D reconstruction module to obtain the projective reconstruction. Projective reconstruction is converted to Euclidean reconstruction by enforcing several metric constraints. After many triangular meshes are obtained, realistic reconstruction of 3D models are finished by texture mapping. The developed system is implemented in C++, and Qt library is used to implement the system user interface. OpenGL graphics library is used to realize the texture mapping routine and the model visualization program. Experimental results using synthetic and real image data are included to demonstrate the effectiveness of the developed system.

Detection of the co-planar feature points in the three dimensional space (3차원 공간에서 동일 평면 상에 존재하는 특징점 검출 기법)

  • Seok-Han Lee
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.16 no.6
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    • pp.499-508
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    • 2023
  • In this paper, we propose a technique to estimate the coordinates of feature points existing on a 2D planar object in the three dimensional space. The proposed method detects multiple 3D features from the image, and excludes those which are not located on the plane. The proposed technique estimates the planar homography between the planar object in the 3D space and the camera image plane, and computes back-projection error of each feature point on the planar object. Then any feature points which have large error is considered as off-plane points and are excluded from the feature estimation phase. The proposed method is archived on the basis of the planar homography without any additional sensors or optimization algorithms. In the expretiments, it was confirmed that the speed of the proposed method is more than 40 frames per second. In addition, compared to the RGB-D camera, there was no significant difference in processing speed, and it was verified that the frame rate was unaffected even in the situation that the number of detected feature points continuously increased.

Study on the Method of the Setting up Depth Grid by Editing Digital Terrain Model (수치지형모형(DTM) 수정을 통한 침수범위설정 방법 연구)

  • Lee, Jeong-U;Park, Nam-Hee;Kim, Chul
    • Proceedings of the Korea Water Resources Association Conference
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    • 2011.05a
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    • pp.166-170
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    • 2011
  • HEC-GeoRAS는 HEC-RAS의 모의값을 토대로 지형공간자료로 나타내기 위한 ArcView GIS의 확장모형이다. 이모형은 홍수 범람도 작성 및 침수피해 위험도 평가 등에 이용되고 있으며, 이때 홍수 범람도 작성이나 침수범위 설정에 이용되는 지형자료가 수치지형모형(DTM)이다. 수치지형모형에서 표고는 수치지도와 횡단자료를 중첩시켜 만든 TIN(Triangulated Irregular Network)과 같은 자료 구조 규칙을 사용하여 저장된다. HEC-GeoRAS에서 여러 가지 RAS Themes을 만드는데 이 중에서 지형속성 Themes을 생성할 때 문제점이 발생하는데 사용자가 HEC-GeoRAS 사용하여 직접 드로잉하기 때문에 잘못된 위치에 지형속성자료를 입력할 수 있다는 것이다. 또한 TIN생성 시 하천 고수호안이 수직 옹벽형태로 되어 있으면 벽체에 여러 개의 고도자료가 존재하는데 한 개의 고도값만 입력할 수 있어 횡단면이 왜곡된다는 점이다. 본 연구에서는 이러한 문제점을 해결하고자 ArcView GIS에서 RAS Themes을 구축할 때 Auto CAD를 사용하여 지형속성자료를 드로잉 하였고, 수직 옹벽형태의 측점을 수정하여 고도값을 추가 입력하였다. 연구 대상지역은 광주천으로 고수호안이 수직 옹벽형태로 되어 있어 벽체에 여러 개의 고도값이 존재하므로 TIN 구축 시 횡단면이 왜곡되는 하천이다. 연구결과 횡단자료가 갖고 있는 좌표를 Auto CAD에서 입력할 수 있어 정확한 위치에 지형속성자료를 생성할 수 있었다. 또한 수직 옹벽형태의 측점을 수정하여 고도값을 추가 입력함으로써 횡단면 왜곡을 보완할 수 있었다. 홍수량에 따른 최대 침수심과 침수면적을 분석한 결과 횡단자료 수정 전 후 2배정도 차이가 생김을 알 수 있었다. 본 연구의 결과를 이용하면 보다 정확한 침수범위를 설정할 수 있고, 저빈도 홍수위 분석도 용이할 것이다.

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A Study on Estimating Rice Yield of North Korea using MODIS NDVI (MODIS NDVI를 이용한 북한의 벼 수량 추정 연구)

  • Hong, S.Young;Choe, Eun-Young;Kim, Gun-Yeob;Kang, Sin-Kyu;Kim, Yi-Hyun;Zhang, Yong-Seon
    • Proceedings of the KSRS Conference
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    • 2009.03a
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    • pp.116-120
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    • 2009
  • 원격탐사 기술은 사람이 직접 방문하여 조사하기 힘든 극지라든가 농업환경에 대한 자료 요구도가 높으면서도 직접 수집이 어려운 비접근 지역에 대한 정보를 추출하는데 유용한 관측수단이다. 본 연구는 MODIS(Moderate Resolution Imaging Spectroradiometer) 제공 산출물 중 16일 단위로 작성되는 NDVI(Normalized Difference Vegetation Index, MOD13)를 이용하여 북한의 벼 수량을 추정하는 것을 목적으로 하였고, 그 가능성과 한계에 대하여 알아보았다. 2000년부터 2008년까지 촬영된 MODIS MOD13 자료를 미국 NASA로부터 제공받아 좌표체계를 우리나라에 맞게 투영하고 NDVI를 추출하여 자료분석에 사용하였다. 통계청에서 발표한 벼 수량 및 생산량 통계자료를 이용하였다. 농촌진흥청 국립농업과학원에서 작성한 북한의 토지피복분류도를 이용하여 서해안 평야지대에 위치한 논을 위도별로 네군데 정하여 관심지역(area of interest)으로 설정하였다. 이 관심지역에 대한 시계열 값을 추출하여 연중 연간 변화를 분석하고 2000년부터 2007년까지 수잉기의 NDVI 값을 이용하여 수량에 대한 상관계수(r)는 $0.77^*$로 5%에서 유의하여 NDVI 값에 따라 벼 수량에 큰 영향을 주는 것으로 나타났다. 수잉기의 NDVI 값과 벼 수량에 대해 회귀분석한 결과($R^2=0.591^*$), NDVI에 따른 벼 수량의 변이를 59.1% 설명할 수 있었다. 이와 같이 회귀식을 이용하여 2008년 북한의 벼 수량은 약 2.80 ton/ha로 추정되었다.

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Real-Time Location Identification of Indoor Rescuees at Accident Sites and Location-Based Rescue Response (사고 현장 실시간 실내 인명 위치확인 및 구조대응 연구)

  • Ko, Youngjoo;Shin, Yongbeom;Yoo, Sangwoo;Shin, Dongil
    • Journal of the Korean Institute of Gas
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    • v.25 no.3
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    • pp.46-52
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    • 2021
  • In this study, the on-site location identification and response system was proposed by accurately checking the location information of rescue requesters in the buildings using the smartphone Wi-Fi AP. The location server was requested to measure the strength of the Wi-Fi AP at least 25 times at 8 different building location points. And the accuracy of the position and the error range were checked by analyzing the coordinate values of the received positions. In addition, the response time was measured by changing the conditions of location information in three groups to compare the response time for saving lives with and without location information. The minimum and maximum error values for the eight cases were found to be at least 4.137 m and up to 14.037 m, respectively, with an average error of 9.525 m. Compared to the base transceiver station (BTS) based position error value of 263m, the range could be reduced by up to 93%. When the location information was given, it took 10 minutes and 50 seconds to save lives; however, when there was no location information at all, rescue process took more than 45 minutes. From this research effort, it was analyzed that the acquisition of the location information of rescuees in the building using the smartphone Wi-Fi AP approach is effective in reducing the life-saving time for on-site responses.

Assessment of Imaging Distortion in Magnetic Resonance Imaging for Stereotactic Radiosurgery: Through Phantom Study (뇌정위 방사선수술 시스템을 위한 자기공명영상의 공간적 왜곡의 측정 : 모형실험을 통한 연구)

  • 박선원;한문희;김동규;정현태;송인찬
    • Investigative Magnetic Resonance Imaging
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    • v.4 no.1
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    • pp.7-13
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    • 2000
  • Purpose : To assess the distortion of MRI with the Leksell stereotactic radiosurgery system in variable pulse sequence and imaging plane through phantom study, to find most adequate imaging plane and pulse sequence for stereotactic radiosurgery system. Materials and methods : We made the phantoms for MRI and get images in variable conditions and analyzed the image distortion using image analysis program, and statistically using paired student t-test. Results : The transeverse plane images had acceptable error ranges bless than 1.5mm) in all pulse sequence in both the analysis of fiducial marker in stereotactic G-frame and the phantom study. The coronal plane images had unacceptable large errors (more than 1.7mm) in the analysis of fiducial marker in the stereotactic G-frame, but had corrected small errors (less than 1.5mm) in the phantom study. Conclusion : We find from the phantom study that the present MR machines are adequate for stereotactic surgery system in frequently used pulse sequences, and imaging planes.

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