1
|
Jasińska A, Pyka K, Pastucha E, Midtiby HS. A Simple Way to Reduce 3D Model Deformation in Smartphone Photogrammetry. SENSORS (BASEL, SWITZERLAND) 2023; 23:728. [PMID: 36679525 PMCID: PMC9860635 DOI: 10.3390/s23020728] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
Recently, the term smartphone photogrammetry gained popularity. This suggests that photogrammetry may become a simple measurement tool by virtually every smartphone user. The research was undertaken to clarify whether it is appropriate to use the Structure from Motion-Multi Stereo View (SfM-MVS) procedure with self-calibration as it is done in Uncrewed Aerial Vehicle photogrammetry. First, the geometric stability of smartphone cameras was tested. Fourteen smartphones were calibrated on the checkerboard test field. The process was repeated multiple times. These observations were found: (1) most smartphone cameras have lower stability of the internal orientation parameters than a Digital Single-Lens Reflex (DSLR) camera, and (2) the principal distance and position of the principal point are constantly changing. Then, based on images from two selected smartphones, 3D models of a small sculpture were developed. The SfM-MVS method was used, with self-calibration and pre-calibration variants. By comparing the resultant models with the reference DSLR-created model it was shown that introducing calibration obtained in the test field instead of self-calibration improves the geometry of 3D models. In particular, deformations of local concavities and convexities decreased. In conclusion, there is real potential in smartphone photogrammetry, but it also has its limits.
Collapse
Affiliation(s)
- Aleksandra Jasińska
- Faculty of Geo-Data Science, Geodesy, and Environmental Engineering, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland
| | - Krystian Pyka
- Faculty of Geo-Data Science, Geodesy, and Environmental Engineering, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland
| | - Elżbieta Pastucha
- UAS Center, The Maersk Mc-Kinney Moller Institute, University of Southern Denmark, Campusvey 55, 5230 Odense, Denmark
| | - Henrik Skov Midtiby
- UAS Center, The Maersk Mc-Kinney Moller Institute, University of Southern Denmark, Campusvey 55, 5230 Odense, Denmark
| |
Collapse
|
2
|
Walker DT, Jiang T, Santamaria A, Osadchiy V, Daniels D, Sturm RM, Mills JN, Eleswarapu SV. 3D-printed phantoms to quantify accuracy and variability of goniometric and volumetric assessment of Peyronie's disease deformities. Int J Impot Res 2021; 34:786-789. [PMID: 34743194 DOI: 10.1038/s41443-021-00486-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 10/10/2021] [Accepted: 10/15/2021] [Indexed: 11/09/2022]
Abstract
Characterization of Peyronie's disease (PD) involves manual goniometry and penile length measurement. These techniques neglect volume loss or hourglass deformities. Inter-provider variability complicates accuracy. Using 3D-printed models, we aimed to evaluate measurement accuracy and variability and establish computational assessment workflows. Five digital phantoms were created: 13.0 cm cylinder, 13.0 cm hourglass cylinder, 15.0 cm cylinder with 40° angulation, 12.0 cm straight penis, and 12.9 cm PD penis with 68° angulation and hourglass. Lengths, volumes, and angles were determined computationally. Each phantom was 3D-printed. Ten urology providers determined lengths, angles, and volumes with measuring tape, goniometer, and volume calculator. Provider versus computational measurements were compared to determine accuracy using t-tests or Wilcoxon rank-sum tests. No significant differences were observed between manual assessment of length of penile models and designed length in penile models. Average curvature angles from providers for bent cylinder and PD phantoms were 38.3° ± 3.9° (p = 0.25) and 57.5° ± 7.2° (p = 0.006), respectively. When assessing for volume, hourglass cylinder and bent cylinder showed significant differences between designed volume and provider averages. All assessments of length, angle, and volume showed significant provider variability. Our results suggest manual measurements suffer from inaccuracy and variability. Computational workflows are useful for improved accuracy and volume assessment.
Collapse
Affiliation(s)
- Dyvon T Walker
- Department of Urology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Tommy Jiang
- Department of Urology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Alvaro Santamaria
- Department of Urology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Vadim Osadchiy
- Department of Urology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Doug Daniels
- Department of Urology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Renea M Sturm
- Department of Urology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Jesse N Mills
- Department of Urology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Sriram V Eleswarapu
- Department of Urology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA.
| |
Collapse
|
3
|
Pavone C. Commentary on "Effects of patients' understanding and choice of surgical types on postoperative outcomes of Peyronie's disease: a single-center retrospective study of 108 patients" - the right choice in Peyronie's disease surgery. Asian J Androl 2021. [PMID: 34003173 DOI: 10.4103/aja.aja_43_21;] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Carlo Pavone
- Department of Surgery, Oncology, Stomatology, University of Palermo, Palermo 90142, Italy
| |
Collapse
|
4
|
Pavone C. Commentary on "Effects of patients' understanding and choice of surgical types on postoperative outcomes of Peyronie's disease: a single-center retrospective study of 108 patients" - the right choice in Peyronie's disease surgery. Asian J Androl 2021; 23:546. [PMID: 34003173 PMCID: PMC8451483 DOI: 10.4103/aja.aja_43_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Carlo Pavone
- Department of Surgery, Oncology, Stomatology, University of Palermo, Palermo 90142, Italy
| |
Collapse
|