3D reconstruction of internal wood decay using photogrammetry and sonic tomography,The Photogrammetric Record

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3D reconstruction of internal wood decay using photogrammetry and sonic tomography
The Photogrammetric Record ( IF 2.1 ) Pub Date : 2020-08-06 , DOI: 10.1111/phor.12328
Junjie Zhang ₁ , Kourosh Khoshelham ₁

Affiliation

Knowledge of deteriorations within tree trunks is critical for arborists to conduct individual tree health assessments. Sonic tree tomography, a non‐destructive technique using sound waves, has been widely used to estimate the size and shape of internal decay based on sound wave velocity variations. However, it has commonly been applied to 2D horizontal or vertical cross sections and its accuracy is questionable due to the poor approximation of the shape of the cross section. This paper proposes an integration of close‐range photogrammetry and sonic tomography to enable accurate reconstruction of the exterior and interior of the tree trunk in 3D. The internal wood quality is represented by the spatially interpolated sound wave velocities, using the time of flight of the sound waves and the coordinates of the acoustic sensors obtained from the photogrammetric model. Experimental results show that the proposed approach provides a realistic 3D visualisation of the size, shape and location of the internal deteriorations.

中文翻译：

使用摄影测量和声波层析成像技术对内部木材腐烂进行3D重建

了解树干内部的恶化情况对于树艺师进行个别树木健康评估至关重要。声波树层析成像技术是一种使用声波的非破坏性技术，已广泛用于基于声波速度变化来估计内部衰减的大小和形状。但是，通常将其应用于2D水平或垂直横截面，并且由于横截面形状的近似性差而使其准确性令人怀疑。本文提出了近距离摄影测量法和声波层析成像技术的集成，以能够以3D形式准确重建树干的外部和内部。内部木材质量由空间内插声波速度表示，使用声波的传播时间和从摄影测量模型获得的声学传感器的坐标。实验结果表明，所提出的方法提供了内部劣化的大小，形状和位置的逼真的3D可视化。

更新日期：2020-09-21

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