# 3D Scanners. Javad Malaquti. Intelligent Robotics Seminar. Winter Semester 2013/

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1 3D Scanners Intelligent Robotics Seminar Javad Malaquti Winter Semester 2013/

2 Agenda Introduction Point Cloud Time-of-Flight 3D Laser Scanner Triangulation Based 3D Laser Scanner Structured Light 3D Scanner Applications of 3D Scanning Summary Discussion 2

3 Introduction Problem: How to acquire 3D model of different objects or environments? Solutions: Time-of-Flight (ToF) 3D Laser Scanning Triangular based Laser Scanning Structured Light 3D scanning 3

4 Point Cloud A data structure to represent multi-dimensional points (including X,Y and Z) Image from: ddohan.com Image from: hh-surveys.com 4

5 Time-of-Flight 3D Laser Scanner Measures the object s distance using ToF principle. Distance Laser Emitter Receiver Measurement Object s surface 5

6 ToF 3D Laser Scanner (cont) c = speed of light (exactly 299,792,458 per meter) t = round trip time. Distance = c x t / 2 The accuracy of scanner is depended on how precisely we measure t. 6

7 ToF 3D Laser Scanner (cont) Second-Time-Around echo: An echo received after a time delay exceeding one pulserepetition interval but less than two pulserepetition intervals. Causes range ambiguity. 7

8 ToF 3D Laser Scanner (cont) Approaches to avoid range ambiguity: Appropriate choice of distance. Spatial Multiplexing. Wavelength Multiplexing. 8

9 ToF 3D Laser Scanner (cont) Spatial Multiplexing: Spatial separation by using multiple scanners with multiple orientations. Wavelength Multiplexing: Using multiple wavelengths to operate. Drawback: Needing multiple scanners. 9

10 ToF 3D Laser Scanner (cont) Advantage: Ability to operate on very long distances, a good choice for scanning large buildings and structures. Drawback: The accuracy of distance measurement is relatively low in order of millimeters. 10

11 Triangulation based 3D Laser Scanner Calculates the distance from the object by forming a triangle consisting a laser emitter, the object and a camera. A = Known distance between two corners of the triangle. α = First angle. β = Second angle. Θ = 180 (α + β) The parameters above can fully describe the shape and size of a triangle. 11

12 Triangulation based 3D Laser Scanner (cont) Laser Emitter Object Location of the laser reflection in CCD sensor changes based on object s surface distance. 12

13 Triangulation based 3D Laser Scanner (cont) Advantage: High accuracy (Tens of micrometers). Drawback: Limited range of some meters supported. 13

14 Structured Light 3D Scanner Projects known patterns of light like horizontal bars toward an object and determines the shape and distance of the object by processing the deformation of projected light pattern. 14

15 Structured Light 3D Scanner (cont) The displacement of a stripe can be converted to 3D coordinates. Identify the stripe by a pattern recognition method. Calculate the 3D coordinates from stripe deformation, e.g. Varying stripe widths on the object s surface. 15

16 Structured Light 3D Scanner (cont) Image from: fab.cba.mit.edu 16

17 Structured Light 3D Scanner (cont) Reflection causes the light going away from camera, or to be shined in the camera s optic directly. Resolution: Coating the object Using a diffuser between object and the light source. 17

18 Structured Light 3D Scanner (cont) How to have a complete 3D shape of the object? Putting the object on a turntable and have different markers on object or positioning device, then combine all the scans together. 18

19 Structured Light 3D Scanner (cont) Advantages: High speed of scanning, due to ability of scanning whole field of view at once. Safe for humans because it does not adopt laser technology. Drawback: Sensitive to environment s light. 19

20 Applications of 3D Scanning Robotics (Robot s vision). Modeling of Different Structures (Bridges, Buildings, Historical Places, ). Creating 3D models in Entertainment Industry (Video Games, Movies, ). Made to measure fashion retail. Etc. 20

21 Summary Point Cloud. Time-of-Flight 3D Laser Scanner. Triangulation Based 3D Laser Scanner. Structured Light 3D Scanner. Applications of 3D Scanning. 21

22 References IEEE Standard Radar Definitions, IEEE Std (1998). High-Speed High-Density Data Acquisition in Airborne Laser Scanning Applications, Peter Rieger and Andreas Ullrich, RIEGL LMS GmbH, Wikipedia, the Free Encyclopedia, Pointclouds.org 22

23 Thanks for your attention! Questions and feedback are welcome. 23

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Automotive Applications of 3D Laser Scanning Kyle Johnston, Ph.D., Metron Systems, Inc. 34935 SE Douglas Street, Suite 110, Snoqualmie, WA 98065 425-396-5577, www.metronsys.com 2002 Metron Systems, Inc