Registration with Spheres and Checker Board Targets

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1 Registration with Spheres and Checker Board Targets Work Shop Óscar García Uriarte Sales Engineer 1

2 Index When and Why Targets? Which kind of targets? How to place them. Targets in Scene. Accuracy using targets. Georreferencing. Combining With Other Sensors 2

3 When and Why Targets? Every day Cloud to Cloud Registration is becoming very popular but targets are still necessary for the next cases Geometries that cannot be registered Cloud to Cloud. Some Industrial Plants. Sometimes in big projects. When we are scanning objects. 3

4 Bad Geometries for Cloud to Cloud A Tunnel is almost a cylinder. Two Scans will fit at infinite positions. 4

5 Bad Geometries for Cloud to Cloud A Dome. 5

6 Bad Geometries for Cloud to Cloud A Dome. 6

7 Industrial Plants Difficult to get the right overlap between scans. A small gap due to a weak registration will make the modelling process more complex. 7

8 Some Big Projects For big projects some customers are using targets to: Perfect calculation of times Make a registration before a cloud to cloud registration. Ensure that they can register the scans in the office. Specially in restrict areas and when they have to travel. Spheres to keep safe. 8

9 Scanning Objects When we only want to scan an object 9

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11 Which kind of targets? Spheres Positive Spheres High accuracy Any point of view Negative Spheres Not free Checker Board Checker Board Almost free Easy to attach Compatible with other sensors Checker Board Limited point of view Less accuracy 11

12 How to place the targets What are we doing to register scans? Helmert 3D: Tx, Ty, Tz, ω,ϕ,κ. Reverse intersection: targets in the first scan references for the second scanner Number of targets to align two scans or clusters. Minimum: 2 targets + tilt sensor (activated) Helmert 3D: Tx, Ty, Tz, ω,ϕ,κ. Recommended: 3 or more targets 12

13 How to place the targets Maximize our performance/efficiency Do the job as fast as possible but do it right. Place the targets as efficiently as possible 1. Resolution over the object. 2. Geometry. 3. Resolution over the target. 13

14 How to place the targets Maximize our performance/efficiency Do the job as fast as possible but do it right. Place the targets as efficiently as possible 1. Resolution over the object. 2. Geometry. 3. Resolution over the target. 14

15 How to place the targets Resolution over the object. 15

16 How to place the targets Maximize our performance/efficiency Do the job as fast as possible but do it right. Place the targets as efficiently as possible 1. Resolution over the object. 2. Geometry. 3. Resolution over the target. 16

17 How to place the targets 17

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20 e r r o r 20

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23 e r r o r 23

24 How to place the targets Maximize our performance/efficiency Do the job as fast as possible but do it right. Place the targets as efficiently as possible 1. Resolution over the object. 2. Geometry. 3. Resolution over the target. 24

25 How to place the targets Minimum Number of points over the target Sphere: 60 points Check Board: 4 point per quadrant Different size of targets to extend the range Spheres: Checkerd Boards: 25

26 Targets in Scene (Manual-detection) 26

27 Targets in Scene (Automatic-detection) 27

28 Targets in Scene (Tips) 28

29 Correspondences 29

30 Correspondences (automatic detection) Searching patterns 30

31 Correspondences ( automatic detection) Using the target names

32 Correspondences ( automatic detection) Using the target names 32

33 Correspondences ( Manual way) 33

34 Correspondences ( Manual way) 34

35 Registration Report 35

36 Registration Report e r r o r 36

37 Registration Report 37

38 Accuracy using Targets Scanning a Die: Metrology Device Accuracy: 0.05mm Faro Focus X330 Accuracy:? 38

39 Accuracy using Targets Scanning a Die: Metrology Device Accuracy: 0.05mm Faro Focus X330 Accuracy:? 39

40 Accuracy using Targets 40

41 Using Ground Control Points When? We want to Georreference We want reduce the errors Medium or Big areas/objects. Area Of Interest How to Place the Ground Control Points 41

42 Using Ground Control Points When? We want to Georreference We want reduce the errors Medium or Big areas/objects. Area Of Interest How to Place the Ground Control Points 42

43 Using Ground Control Points Ground Control Point Scans etc. Cluster 1 Cluster 2 43

44 Case 1 (reverse intersection) 44

45 Case 2 (Using total station coordinates) 45

46 Case 3(Using GPS Coordinates) 46

47 Checker Boards 47

48 Thank You For Your Attention Óscar García Uriarte Sales Engineer 48

With FARO PointSense for Revit. Jörg Braunes Platform Owner Software Chris Palmer Sales Engineer 1

From Point Clouds to BIM Models With FARO PointSense for Revit Jörg Braunes Platform Owner Software Chris Palmer Sales Engineer 1 Agenda Scan to BIM with Revit PointClouds in Revit Advanced Workflow with