• Title, Summary, Keyword: Laser Scanner

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A Study on the recognition of moving objects by segmenting 2D Laser Scanner points (2D Laser Scanner 포인트의 자동 분리를 통한 이동체의 구분에 관한 연구)

  • Lee Sang-Yeop;Han Soo-Hee;Yu Ki-Yun
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • pp.177-180
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    • 2006
  • In this paper we proposed a method of automatic point segmentation acquired by 2D laser scanner to recognize moving objects. Recently, Laser scanner is noticed as a new method in the field of close range 3D modeling. But the majority of the researches are pointed on precise 3D modeling of static objects using expensive 3D laser scanner. 2D laser scanner is relatively cheap and can obtain 2D coordinate information of moving object's surface or can be utilized as 3D laser scanner by rotating the system body. In these reasons, some researches are in progress, which are adopting 2D laser scanner to robot control systems or detection of objects moving along linear trajectory. In our study, we automatically segmented point data of 2D laser scanner thus we could recognize each of the object passing through a section.

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Road marking classification method based on intensity of 2D Laser Scanner (신호세기를 이용한 2차원 레이저 스캐너 기반 노면표시 분류 기법)

  • Park, Seong-Hyeon;Choi, Jeong-hee;Park, Yong-Wan
    • IEMEK Journal of Embedded Systems and Applications
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    • v.11 no.5
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    • pp.313-323
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    • 2016
  • With the development of autonomous vehicle, there has been active research on advanced driver assistance system for road marking detection using vision sensor and 3D Laser scanner. However, vision sensor has the weak points that detection is difficult in situations involving severe illumination variance, such as at night, inside a tunnel or in a shaded area; and that processing time is long because of a large amount of data from both vision sensor and 3D Laser scanner. Accordingly, this paper proposes a road marking detection and classification method using single 2D Laser scanner. This method road marking detection and classification based on accumulation distance data and intensity data acquired through 2D Laser scanner. Experiments using a real autonomous vehicle in a real environment showed that calculation time decreased in comparison with 3D Laser scanner-based method, thus demonstrating the possibility of road marking type classification using single 2D Laser scanner.

3D Boundary Extraction of A Building Using Terrestrial Laser Scanner (지상라이다를 이용한 건축물의 3차원 경계 추출)

  • Lee, In-Su
    • Spatial Information Research
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    • v.15 no.1
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    • pp.53-65
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    • 2007
  • Terrestrial laser scanner provides highly accurate, 3D images and by sweeping a laser beam over a scene or object, the laser scanner is able to record millions of 3D points' coordinates in a short period, so becoming distinguished in various application fields as one of the representative surveying instruments. This study deals with 3D building boundary extraction using Terrestrial Laser Scanner. The results shows that high accuracy 3D coordinates for building boundaries are possibly acquired fast, but terrestrial laser scanner is a ground-based system, so "no roofs", and "no lower part of building" due to trees and electric-poles, etc. It is expected that the combination of total station, terrestrial laser scanner, airborne laser scanner with aerial photogrammetry will contribute to the acquisition of an effective 3D spatial information.

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Simulation of ND Filter for Terrestrial Laser Scanner (3차원 레이저 스캐너용 ND 필터의 시뮬레이션)

  • Yang, Soo-Hyo;Oh, Dong-Geun;Jeong, Joong-Yeon
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • pp.65-73
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    • 2009
  • The terrestrial laser scanner measures the signal delay time of electronic circuit in EDM(Electronic Distance Measurement) Module for distance measurement. To measure signal delay time precisely, transmitting laser beam of terrestrial laser scanner is divided optically. Therefore, 10% of the laser beam power is entered into the electronic circuit and the others go out through lens. But, measure of delay time is severe in the laser scanner system that the laser beam power is changed dynamically by reflectance of a object, because characters like gain of electronic circuit involving APD(Avalanche Photo Diode) and so on are changed by incident laser beam. Therefore, we adapt ND(Neutral Density) filter that has grid pattern to the laser scanner system to keep constant the incident laser beam power. In this paper, we propose the simulation program for efficient design of ND filter pattern. Finally, to affirm simulation program, we conduct the experimental test of simulated ND filter that has linearly transmittance change, and we consider the experiment result.

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Multi-facet 3D Scanner Based on Stripe Laser Light Image (선형 레이저 광 영상기반 다면 3 차원 스캐너)

  • Ko, Young-Jun;Yi, Soo-Yeong
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.10
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    • pp.811-816
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    • 2016
  • In light of recently developed 3D printers for rapid prototyping, there is increasing attention on the 3D scanner as a 3D data acquisition system for an existing object. This paper presents a prototypical 3D scanner based on a striped laser light image. In order to solve the problem of shadowy areas, the proposed 3D scanner has two cameras with one laser light source. By using a horizontal rotation table and a rotational arm rotating about the latitudinal axis, the scanner is able to scan in all directions. To remove an additional optical filter for laser light pixel extraction of an image, we have adopted a differential image method with laser light modulation. Experimental results show that the scanner's 3D data acquisition performance exhibited less than 0.2 mm of measurement error. Therefore, this scanner has proven that it is possible to reconstruct an object's 3D surface from point cloud data using a 3D scanner, enabling reproduction of the object using a commercially available 3D printer.

The Study on Reconnaissance Surveying Using Terrestrial Laser Scanner (지상 라이다를 활용한 현황측량 연구)

  • Lee, In-Su;Kang, Sang-Gu
    • Journal of Korean Society for Geospatial Information System
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    • v.14 no.3
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    • pp.79-86
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    • 2006
  • Nowadays 3D terrestrial laser scanners record high precision three-dimensional coordinates of numerous points on an object surface in a short period of time. So terrestrial laser scanner is applied to a wide variety of fields including geodesy, and civil engineering, archaeology and architecture, and emergency service and defence, etc. This study deals with the potential application of terrestrial laser scanner in the reconnaissance surveying. The results shows that terrestrial laser scanner is possible to extract the linear features and the positioning accuracy of objects measured by total station surveying is comparative to that by terrestrial laser scanner. Thereafter, it is expected that the potential applications of terrestrial laser scanning will be more increased by combining terrestrial laser scanners with airborne LiDAR (Light Detection And Ranging) and photogrammetric technology.

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Study on Printing Roll Manufacturing by using 3 Dimensional Laser Scanner (3차원 레이저 스캐너를 이용한 인쇄롤 가공에 관한 연구)

  • Kang, Heeshin;Noh, Jiwhan;Sohn, Hyonkee
    • Journal of Korean Society of Laser Processing
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    • v.16 no.4
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    • pp.17-23
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    • 2013
  • The research for the development of roll-to-roll printing process is actively underway on behalf of the existing semiconductor process. The roll-to-roll printing system can make the electronic devices to low-cost mass production. This study is performed for developing the manufacturing technology of the printing roll used in the printing process of electronic devices. The indirect laser engraving technology is used to create printable roll and the printable roll is made out of the chrome coated roll after coating copper and polymer on the surface of steel roll, ablating the polymer on the surface of roll and etching the roll. The 3 dimensional laser scanner and roll rotating systems are constructed and the system control program is developed. We have used the fiber laser of 100 W grade, the 3 dimensional laser scanner and the 3 axes moving stage system with a rotating axis. We have found the optimal conditions by performing the laser patterning experiments and can make the minimum line width of $24{\mu}m$ by using the developed 3 dimensional laser scanner system.

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Laser projection system that uses a 2D MEMS scanner

  • Seo, Jung-Hoon;Choi, Jung-Hwan;Kim, Yong-Ki;Yi, Jong-Kwon;Kwon, Jae-Wook
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.478-480
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    • 2009
  • This experiment implemented a laser projection system that used the 2D MEMS scanner as the driving method for the display device. The 2D MEMS scanner, which can scan the images horizontally and vertically, was applied to drive the projection system using the interlaced scanning method. The laser was directly modulated to implement the grayscale and the images were WVGA resolution quality.

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Development of 3D Scanner Based on Laser Structured-light Image (레이저 구조광 영상기반 3차원 스캐너 개발)

  • Ko, Young-Jun;Yi, Soo-Yeong;Lee, Jun-O
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.3
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    • pp.186-191
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    • 2016
  • This paper addresses the development of 3D data acquisition system (3D scanner) based laser structured-light image. The 3D scanner consists of a stripe laser generator, a conventional camera, and a rotation table. The stripe laser onto an object has distortion according to 3D shape of an object. By analyzing the distortion of the laser stripe in a camera image, the scanner obtains a group of 3D point data of the object. A simple semiconductor stripe laser diode is adopted instead of an expensive LCD projector for complex structured-light pattern. The camera has an optical filter to remove illumination noise and improve the performance of the distance measurement. Experimental results show the 3D data acquisition performance of the scanner with less than 0.2mm measurement error in 2 minutes. It is possible to reconstruct a 3D shape of an object and to reproduce the object by a commercially available 3D printer.

A study on Waviness of Large Discontinuity using 3D Laser Scanner (3D Laser Scanner를 이용한 대규모 불연속면의 굴곡도 측정 연구)

  • Kim, Yong;Lee, Su-Gon;Kim, Chee-Hwan
    • The Journal of Engineering Geology
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    • v.27 no.2
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    • pp.119-124
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    • 2017
  • The waviness of Large Discontinuity rock is the one of important elements that judges the stability of rock slope. When the waviness of large discontinuity is measured in the field, there are many limitations Therefore this research was carried out to measure waviness of large rock discontinuities using 3D laser scanner to supplement this problem. This research established one 3D model that actual X, Y and Z coordinates through the integrated data gained from one that calculates waviness of base lock using CAD program was compared and analyzed to that of disc-clinometer. As its results, the high reliability of results could be recognized as it belongs to mechanical tolerance $1{\sim}2^{\circ}$ and the results belong to the measured values of Mean DIP and Mean are all within $1^{\circ}$. So, the investigation method of waviness of large discontinuity rock face using 3D laser scanner was verified as more prompt, effective and reliable method than conventional direct site measuring method.