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Vertical Optical Scanning with Panoramic Vision for Tree Trunk Reconstruction
Adilson Berveglieri1, Antonio M G Tommaselli2, Xinlian Liang3,4
1Department of Cartography, São Paulo State University UNESP, 305, Presidente Prudente 19060-900, Brazil. adilsonberveg@gmail.com.
Sensors (Basel, Switzerland)
|December 7, 2017
Summary
This study introduces a fisheye camera technique for creating 3D point clouds of tree trunks. The method achieves high accuracy, comparable to terrestrial laser scanning (TLS), for forest measurements.
Area of Science:
- Forestry
- Photogrammetry
- Computer Vision
Background:
- Accurate 3D mapping of forest ecosystems is crucial for ecological studies and resource management.
- Traditional methods like terrestrial laser scanning (TLS) can be costly and labor-intensive.
- Developing cost-effective and efficient techniques for forest mensuration is an ongoing research area.
Purpose of the Study:
- To present and evaluate a novel technique for generating dense 3D point clouds of tree trunks using a single planimetric station and a fisheye camera.
- To assess the accuracy of tree trunk measurements derived from the proposed photogrammetric method.
- To compare the performance of the new technique against established methods like TLS.
Main Methods:
- Utilizing vertical optical flow with a fisheye camera to capture image data in a forest plot.
- Employing photogrammetric software with fisheye models and weighted geometric constraints for image orientation and dense point cloud generation.
- Reconstructing and mapping tree trunks in a local reference system.
- Conducting accuracy assessments by comparing measured trunk diameters and fitting cylindrical shapes to point cloud sections against TLS data.
Main Results:
- The proposed technique successfully generated dense 3D point clouds of tree trunks.
- Accuracy assessment showed an average difference of less than 1 cm between photogrammetric and TLS-derived trunk sections when fitted with cylinders.
- Point densities achieved were approximately 1/3 less than TLS, with potential for improvement using higher resolution cameras.
Conclusions:
- The vertical optical flow technique with a fisheye camera offers a practical and accurate solution for 3D forest mensuration.
- The method demonstrates high geometric accuracy for tree trunk reconstruction, comparable to TLS.
- Further improvements in point density are achievable through hardware advancements, enhancing the technique's applicability.
