• Title/Summary/Keyword: Structured Information

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Development of Ranging Sensor Based on Laser Structured Light Image (레이저 구조광 영상기반 거리측정 센서 개발)

  • Kim, Soon-Cheol;Yi, Soo-Yeong
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.4
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    • pp.309-314
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    • 2015
  • In this study, an embedded ranging system based on a laser structured light image is developed. The distance measurement by the structured light image processing has efficient computation because the burdensome correspondence problem is avoidable. In order to achieve robustness against environmental illumination noise and real-time laser structured light image processing, a bandpass optical filter is adopted in this study. The proposed ranging system has an embedded image processor performing the whole image processing and distance measurement, and so reduces the computational burden in the main control system. A system calibration algorithm is presented to compensate for the lens distortion.

Extracting 2D-Mesh from Structured Light Image for Reconstructing 3D Faces (3차원 얼굴 복원을 위한 구조 광 영상에서의 2차원 메쉬 추출)

  • Lee, Duk-Ryong;Oh, Il-Seok
    • Proceedings of the Korea Contents Association Conference
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    • 2007.11a
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    • pp.248-251
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    • 2007
  • In this paper, we are propose a method to estimate the 2-D mesh from structured light image for reconstruction of 3-D face image. To acquire the structured light image, we are project structured light on the face using the projector. we are extract the projected cross points from the acquire image. The 2-D mesh image is extracted from the position and angle of cross points. In the extraction processing, the error was fixed to extract the correct 2-D mesh.

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An Indexing Model for Efficient Structure Retrieval of XML Documents (XML 문서의 효율적인 구조 검색을 위한 색인 모델)

  • Park, Jong-Gwan;Son, Chung-Beom;Gang, Hyeong-Il;Yu, Jae-Su;Lee, Byeong-Yeop
    • The KIPS Transactions:PartD
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    • v.8D no.5
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    • pp.451-460
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    • 2001
  • In this paper, we propose an indexing model for efficient structure retrieval of XML documents. The proposed indexing model consists of structured information that supports a wide range of queries such as content-based queries and structure-attribute queries at all levels of the document hierarchy and index organizations that are constructed based on the information. To support structured retrieval, a new representation method for structured information is presented. Using this structured information, we design content index, structure index, and attribute index for efficient retrieval. also, we explain processing procedures for mixed queries and evaluate the performance of proposed indexing model. It is shown that the proposed indexing model achieves better retrieval performance than the existing method.

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Three Dimensional Geometric Feature Detection Using Computer Vision System and Laser Structured Light (컴퓨터 시각과 레이저 구조광을 이용한 물체의 3차원 정보 추출)

  • Hwang, H.;Chang, Y.C.;Im, D.H.
    • Journal of Biosystems Engineering
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    • v.23 no.4
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    • pp.381-390
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    • 1998
  • An algorithm to extract the 3-D geometric information of a static object was developed using a set of 2-D computer vision system and a laser structured lighting device. As a structured light pattern, multi-parallel lines were used in the study. The proposed algorithm was composed of three stages. The camera calibration, which determined a coordinate transformation between the image plane and the real 3-D world, was performed using known 6 pairs of points at the first stage. Then, utilizing the shifting phenomena of the projected laser beam on an object, the height of the object was computed at the second stage. Finally, using the height information of the 2-D image point, the corresponding 3-D information was computed using results of the camera calibration. For arbitrary geometric objects, the maximum error of the extracted 3-D feature using the proposed algorithm was less than 1~2mm. The results showed that the proposed algorithm was accurate for 3-D geometric feature detection of an object.

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A Novel Robot Sensor System Utilizing the Combination Of Stereo Image Intensity And Laser Structured Light Image Information

  • Lee, Hyun-Ki;Xingyong, Song;Kim, Min-Young;Cho, Hyung-Suck
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.729-734
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    • 2005
  • One of the important research issues in mobile robot is how to detect the 3D environment fast and accurately, and recognize it. Sensing methods of utilizing laser structured light and/or stereo vision are representatively used among a number of methodologies developed to date. However, the methods are still in need of achieving high accuracy and reliability to be used for real world environments. In this paper to implement a new robotic environmental sensing algorithm is presented by combining the information between intensity image and that of laser structured light image. To see how effectively the algorithm applied to real environments, we developed a sensor system that can be mounted on a mobile robot and tested performance for a series of environments.

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Representing and retrieving the Structured Information of XML Documents (XML 문서에 포함된 구조 정보의 표현과 검색)

  • Jo, Yun-Gi;Jo, Jeong-Gil;Lee, Byeong-Ryeol;Gu, Yeon-Seol
    • The KIPS Transactions:PartD
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    • v.8D no.4
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    • pp.361-366
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    • 2001
  • As growing the number of Webs, the total amount of accessible information has been greater than ever. To storage and retrieve the vast information on the Webs effectively, many researchers have been made utilizing XML (extensible Markup Language). In this paper, we propose an effective method of representation and retrieval mechanism for the structured retrieval of the XML documents : (1) the fixed sized LETID (Leveled Element Type ID) that contains the information of elements such as parent node, sibling nodes, and identical sibling nodes, and the hierachical information of current node, and (2) content index, structure index, attribute index model, and the information retrieval algorithm for the structured information retrieval. With our methods, we can effectively represent the structured information of XML documents, and can directly access the specific elements by simple operations to process various queries.

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Restoration of Distorted Document Image Due to Depth Variation by Using Structured Light (Structured light를 이용한 깊이 차이에 문자 왜곡 교정)

  • Heo, Hoon;Chae, Ok-Sam
    • Proceedings of the Korean Information Science Society Conference
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    • 2001.04b
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    • pp.487-489
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    • 2001
  • 제본된 책이나 고문서를 디자타이즈할 때 책을 바르게 펴지 못하거나 지정된 위치나 방위로 위치시키지 못해서 문제가 발생한다. 특히 힘을 가할 수 없는 고문서의 경우에는 바르게 펼수가 없기 때문에 깊이 차이에 의한 문서의 왜곡이 발생한다. 본 연구에서는 Structured Light을 이용하여 깊이 차에 의한 문자의 왜곡을 복원하는 방안을 제안한다. 또한 입력시 책의 위치와 방위에 대한 제한을 완화시킬 수 있도록 책의 위치와 방위 변화에 적을 알 수 있는 방안을 제안한다,

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Measurement of the Internet Banking Customer Satisfaction using Structured Equation Model

  • Choi, Kyung-Ho
    • Journal of the Korean Data and Information Science Society
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    • v.16 no.2
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    • pp.301-311
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    • 2005
  • This study has conducted to measure the internet banking customer satisfaction using structured equation model. Data was collected by e-mail system. Among survey panel who had experience of using Hanwha-Bank internet banking service, final samples were 2,848 respondents. The results showed that usage convenience and economy factor was most correlated with customer satisfaction. And we found that word-of-mouth behavior was affected customer satisfaction.

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Visual Resolution Enhancement Method for a Delta-structured Display (델타 배열 구조를 갖는 디스플레이에서의 시각적 해상도 향상 방법)

  • 최원희;이성덕;김창용
    • Proceedings of the IEEK Conference
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    • 2003.11a
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    • pp.19-22
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    • 2003
  • This paper proposes the method of visual resolution enhancement to render a color image on a delta-structured display. The proposed method adopted a subpixel rendering method to reduce a color fringe error caused by delta- structured display and to improve visual resolution

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