A quick and low-cost smartphone photogrammetry method for obtaining 3D particle size and shape

Fang, Kun; Zhang, Jiefei; Tang, Huiming; Hu, Xiaolong; Yuan, Hao; Wang, Xiaotao; An, Pengju; Ding, Bingdong

doi:10.1016/j.enggeo.2023.107170

Cited by 40 publications

(21 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Smartphone-based photogrammetry offers key advantages, such as accessibility, portability, and high-resolution image capture, which are particularly beneficial in clinical and investigative settings where mobility and ease are crucial. Additional studies support the feasibility and effectiveness of smartphone photogrammetry in a wide variety of contexts [21][22][23], reinforcing our argument regarding its relevance in craniofacial morphology assessment. The widespread availability of smartphones can also cut costs, making this technique economically appealing.…”

Section: Introductionsupporting

confidence: 76%

Craniofacial 3D Morphometric Analysis with Smartphone-Based Photogrammetry

Quispe-Enriquez,

Valero-Lanzuela,

Lerma

2023

Sensors

View full text Add to dashboard Cite

Obtaining 3D craniofacial morphometric data is essential in a variety of medical and educational disciplines. In this study, we explore smartphone-based photogrammetry with photos and video recordings as an effective tool to create accurate and accessible metrics from head 3D models. The research involves the acquisition of craniofacial 3D models on both volunteers and head mannequins using a Samsung Galaxy S22 smartphone. For the photogrammetric processing, Agisoft Metashape v 1.7 and PhotoMeDAS software v 1.7 were used. The Academia 50 white-light scanner was used as reference data (ground truth). A comparison of the obtained 3D meshes was conducted, yielding the following results: 0.22 ± 1.29 mm for photogrammetry with camera photos, 0.47 ± 1.43 mm for videogrammetry with video frames, and 0.39 ± 1.02 mm for PhotoMeDAS. Similarly, anatomical points were measured and linear measurements extracted, yielding the following results: 0.75 mm for photogrammetry, 1 mm for videogrammetry, and 1.25 mm for PhotoMeDAS, despite large differences found in data acquisition and processing time among the four approaches. This study suggests the possibility of integrating photogrammetry either with photos or with video frames and the use of PhotoMeDAS to obtain overall craniofacial 3D models with significant applications in the medical fields of neurosurgery and maxillofacial surgery.

show abstract

Section: Introductionsupporting

confidence: 76%

Craniofacial 3D Morphometric Analysis with Smartphone-Based Photogrammetry

Quispe-Enriquez,

Valero-Lanzuela,

Lerma

2023

Sensors

View full text Add to dashboard Cite

show abstract

“…After 128 m, the rock is basically intact, and the deformation is very weak. A reliable particle measurement method can be used to obtain the 3D particle size and shape of the pebbles [27]. In Figure 5, at the 8 m point in PD23 adit, the F1 fault is developed, with a trend of 39 • and a dip of 80 • .…”

Section: Distribution Characteristics Of the Zhuka Faultmentioning

confidence: 99%

“…Based on further investigations of the site area, the main evidence for the inactivity of the Zhuka fault can be summarized as follows: The III terrace in the area is over 100,000 years old, indicating that the Zhuka fault has been inactive since the Late Pleistocene. A reliable particle measurement method can be used to obtain the 3D particle size and shape of the pebbles [27]. (e) In Figure 7a, quartz morphology scanning results of the clastic materials from the main fault (F4) of the Zhuka fault at the PD23 adit site show that there is no shell-like quartz or sub-shell-like quartz, and that the main type of quartz is fish scaly and mossy (50%).…”

Section: Activity Of the Zhuka Faultmentioning

confidence: 99%

“…(d) No disturbance, folding, or faulting in the Neogene and Quaternary strata in the overlying and adjacent areas and no deformation was observed in the I-III terraces of the Rongqu River, as shown in Figure 6c,d. The III terrace in the area is over 100,000 years old, indicating that the Zhuka fault has been inactive since the Late Pleistocene.A reliable particle measurement method can be used to obtain the 3D particle size and shape of the pebbles[27].…”

mentioning

confidence: 99%

See 1 more Smart Citation

The Deformation Characteristics of the Zhuka Fault in Lancang River and Its Influence on the Geostress Field

Hu,

Wen,

et al. 2023

Sustainability

View full text Add to dashboard Cite

The construction of infrastructure projects such as the Sichuan–Tibet Railway and western cascade hydropower stations has led to the increasing development of ultra-long and deeply buried tunnels in an environment characterized by highly active neotectonic movement, which affects the sustainable development of ecological civilization in Tibet. However, the effects of faults resulting from tectonic activity on the distribution of geostress fields have not been systematically studied. This research focuses on the development characteristics and basic type of the Zhuka fault near the RM hydropower station, aiming to analyze the phenomenon of geostress concentration in the study area. Field investigations have revealed significant high-geostress damage on the downstream slope of the lower dam site, situated on the hanging wall of the Zhuka fault. The results indicate a correlation between these high-geostress phenomena and the Zhuka fault, suggesting the concentration of geostress within a certain range on the hanging wall and outside of the fault zone. Stress concentration primarily depends on the characteristics of fault thrusting and fault morphology. The left-lateral strike-slip and thrusting process of the Zhuka fault, combined with NNW-directed tectonic compression stress and sudden changes in fault strike, contribute to geostress concentration within a specific range of the fault hanging wall. The observed high-geostress damage to the hard rock on the valley slope results from the combined effect of construction stress concentration and fourth-order valley incision stress concentration, which influences site selection for the RM hydropower station, thereby highlighting the role of geostress concentration outside the fault zone in engineering practice. This study provides valuable insights into geostress concentration and its implications for sustainable development in the Sichuan–Tibet region.

show abstract

“…Their centrifuge model tests results showed that the failure surface is at an angle to the horizontal. An image analysis method can help us to identify the slip plane [31]. Therefore, considering the actual surface angle between the active wedge and the passive wedge when analyzing slope instability is practical and has engineering significance.…”

Section: Introductionmentioning

confidence: 99%

Limit Equilibrium Analysis of Landfill Instability Based on Actual Failure Surface

Li,

Chen,

Lin

2023

Applied Sciences

View full text Add to dashboard Cite

Slope stability is one of the key engineering problems in the whole lifetime of landfills. In this paper, combined with the wedge limit equilibrium analysis, a landfill stability analysis method based on the actual failure surface is proposed, and the model is verified according to the data of centrifuge model tests. It is found that this method can more accurately calculate the factor of safety (FS) of the slope of the landfill and evaluate the stability of the slope. Finally, sensitivity analysis was conducted to evaluate the effects of the actual failure surface angle, water level, soil parameters, and the presence or absence of a dam on the factor of safety.

show abstract

A quick and low-cost smartphone photogrammetry method for obtaining 3D particle size and shape

Cited by 40 publications

References 38 publications

Craniofacial 3D Morphometric Analysis with Smartphone-Based Photogrammetry

Craniofacial 3D Morphometric Analysis with Smartphone-Based Photogrammetry

The Deformation Characteristics of the Zhuka Fault in Lancang River and Its Influence on the Geostress Field

Limit Equilibrium Analysis of Landfill Instability Based on Actual Failure Surface

Contact Info

Product

Resources

About