Close Range Digital Photogrammetry

1
Close Range Digital Photogrammetry

• Curtis Holub
• March 15, 2006

2
Outline

• Definition and Uses (2)
• General procedure (1)
• PhotoModeler Software (3)
• Accuracy (1)
• Conclusions (1)
• Producers and References (1)

3
Definition

• Photogrammetry
• a measuring technique allowing the modelling of
  a 3D space using 2D images

Source Geodetic Systems, Inc
4
Subdivisions and Use

• Photogrammetry
• Aerial
• Terrestrial
• Close range
• Digital
• Applications
• manufacturing processes
• architectural modeling
• equipment design and installation
• construction
• entertainment and special effects
• forensics

Source North Carolina DOT
5
General Procedure
Camera Calibration and Orientation
Source Geodetic Systems, Inc
6
Referencing
Source Photomodeler
7
3D Output
Source Photomodeler
8
Automation
Source Photomodeler
9
Accuracy
Source Geodetic Systems, Inc

• Current capabilities
• 1/10 to 1/50 of pixel
• 1/20,000 to 1/100,000 of object
• 0.009 to 0.002 on a 15 ft object

10
Conclusions

• Many potential applications exist
• Accuracy levels are impressive and continue to
  improve
• For a single measurements the method is simple
  and quick
• Post-processing demands increase for multiple
  measurements
• Industry trend is towards improved automation

11
Producers and References

• Producers
• EOS Systems Inc. http//www.photomodeler.com/
• Geodetic Services Inc. http//www.geodetic.com/
• Vexcel http//www.vexcel.com/
• Shape Quest Inc. http//www.shapecapture.com/
• Other References
• Elements of Photogrammetry
• Authors M. Kasser and Y. Egels
• Digital Photogrammetry
• Authors P. Wolf and B. Dewitt
• Jun Ji