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A Simple Optical Dendrometer based on a Digital Camera and Visible Laser Pointer

This presentation explores the use of a simple optical dendrometer system that combines a digital camera and visible laser pointer to measure tree diameters. The advantages, disadvantages, and possible alternatives of this tagging system are also discussed.

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A Simple Optical Dendrometer based on a Digital Camera and Visible Laser Pointer

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  1. A Simple Optical Dendrometer based on a Digital Camera and Visible Laser Pointer (The Art of Kamera Sutra) John A. Kershaw, Jr. Western Mensurationists Meeting Vancouver, WA June 21-23, 2009

  2. Panoramic Tripod Mount

  3. Stitching Process • Used software called panorama factory • http://www.panoramafactory.com/ • Automates the process • Corrects geometrical lens errors

  4. Panoramic Photo Plots

  5. Enhanced Photo Points • Tagged trees • Indexes trees in the image • Width of the tag is a constant • ARTag • http://www.cv.iit.nrc.ca/research/ar/artag/

  6. Previous comments • If you have to “tag” each tree, why not simply measure it? • Seems to be substituting office time for field time?

  7. NSERC Discovery Grant • Go from “off-the-shelf” technology to dedicated camera-field data collector system • Explore advantages/disadvantages of tagging system and possible alternatives • Stereo Panoramic Photos • 360/180 hemisphere photos • Image Segmentation • Hidden Tree Identification • Nagging problem of determining scale with a vanishing point horizon

  8. Stereo Panoramas

  9. 360/180 Panoramas (Mercator Projection)

  10. An innocent start

  11. A Distance function

  12. Too Sensitive to Camera Plane

  13. Dual Laser Setup

  14. Canon SD430 – 5.0MP Canon SD990 – 15.0MP Canon 5D – 22.0MP

  15. A New Distance Function

  16. DBH Resolution (cm/pixel)

  17. Quick Test on 4 Trees by 5 Distances(Canon 5D) Predicted Distance vs Observed Distance Predicted DBH versus Observed DBH

  18. Upper Stem Diameters

  19. Automating the Process (100% laser)

  20. Automating the Process (20% laser)

  21. Full Panorama Plot

  22. Next Steps • Stabilize Laser Mounts • Test on Upper Stem Diameters • Automate Process • Build Image Analysis System on SD990

  23. Questions?

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