Analysis of Influencing Factors of Single Camera Photogrammetry in Forensic Three-Dimensional Reconstruction.
10.12116/j.issn.1004-5619.2020.05.011
- Author:
Dong Hua ZOU
1
;
Jin Ming WANG
1
;
Yi Jiu CHEN
1
;
Zheng Dong LI
1
;
Jia Wen WANG
2
;
Zhi Qiang QIN
1
;
Jiang HUANG
2
Author Information
1. Shanghai Key Laboratory of Forensic Medicine, Key Laboratory of Forensic Science, Ministry of Justice, Shanghai Forensic Service Platform, Academy of Forensic Science, Shanghai 200063, China.
2. School of Forensic Medicine, Guizhou Medical University, Guiyang 550004, China.
- Publication Type:Journal Article
- Keywords:
forensic pathology;
photography;
structured-light scanning;
imaging, three-dimensional
- MeSH:
Forensic Medicine;
Imaging, Three-Dimensional;
Photogrammetry;
Skull/diagnostic imaging*;
Software
- From:
Journal of Forensic Medicine
2020;36(5):666-671
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the influence of factors such as the selection of equipment, focal length and the selection of reconstruction quality in the reconstruction software on the reconstruction results of single camera photogrammetry and provide reference for the forensic application of single camera photogrammetry. Methods The 19 skulls were measured by traditional measurement method and single camera photogrammetry. The differences between the two measurement methods and within the group with same equipment but different focal length were analyzed. One skull and one corpse were selected as the research objects. According to the reconstruction quality selection conditions in the photogrammetric software, the experimental group was divided into five grades. The model reconstructed by optical scanner was defined as reference model, while the model reconstructed by single camera photogrammetry was defined as test model. The test model was aligned with the reference model, 3D deviation analysis was carried out and the mean error and root mean square （RMS） values were calculated. Results The differences between EOS 7D zoom group and traditional measurement, and within the group with same equipment had statistical significance （P<0.05）. The mean error value and minimum RMS value of the skull reconstructed by single camera photogrammetry and the three-dimensional model of the corpse existed in the medium quality group, and the trend was basically the same. Conclusion The equipment and focal length has no obvious influence on the results of single camera photogrammetry. Lower reconstruction quality can easily cause distortion, while higher reconstruction quality can easily generate noise, so medium quality is preferred.
