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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. Panoramic Tripod Mount. Stitching Process. Used software called panorama factory
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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
Stitching Process • Used software called panorama factory • http://www.panoramafactory.com/ • Automates the process • Corrects geometrical lens errors
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/
Previous comments • If you have to “tag” each tree, why not simply measure it? • Seems to be substituting office time for field time?
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
Canon SD430 – 5.0MP Canon SD990 – 15.0MP Canon 5D – 22.0MP
Quick Test on 4 Trees by 5 Distances(Canon 5D) Predicted Distance vs Observed Distance Predicted DBH versus Observed DBH
Next Steps • Stabilize Laser Mounts • Test on Upper Stem Diameters • Automate Process • Build Image Analysis System on SD990