Abstract
This paper presents a new method based on 3D reconstruction from images that demonstrates the utility and integration of close-range photogrammetry and computer vision as an efficient alternative to modelling complex objects and scenarios of forensic infography. The results obtained confirm the validity of the method compared to other existing alternatives as it guarantees the following: (i) flexibility, permitting work with any type of camera (calibrated and non-calibrated, smartphone or tablet) and image (visible, infrared, thermal, etc.); (ii) automation, allowing the reconstruction of three-dimensional scenarios in the absence of manual intervention, and (iii) high quality results, sometimes providing higher resolution than modern laser scanning systems. As a result, each ocular inspection of a crime scene with any camera performed by the scientific police can be transformed into a scaled 3d model.
Highlights
Forensic infography is a technique that facilitates the virtual reconstruction of different facts through computer science and digital image management
Considering the limitations remarked above in the field of forensic infography, this paper aims to contribute to the development of a 3D reconstruction method from images using the Open Source tools Apero-MicMac [13] and Cloud Compare [14]
Two different sites and sensors were chosen to undertake the experiments, with the purpose of adapting the method to a threefold requirement proposed by the Scientific Police: (i) to cope with scenes with textureless objects; (ii) to allow the possibility of using smartphones; and (iii) to guarantee enough accuracy for forensic infography
Summary
Forensic infography is a technique that facilitates the virtual reconstruction of different facts through computer science and digital image management. Geomatics and non-intrusive techniques based on remote data acquisition have been incorporated into the domain of forensic infography because they allow for the scene be remain unchanged, without altering either its spatial position or physical properties. This method provides the metric reconstruction of the incident with rigor, thoroughness and accuracy, facilitating a return to the crime scene in order to reconstruct its signs. The two most applied geomantic techniques in the field of forensic infography are close-range photogrammetry [2,3,4] and laser scanning [5,6,7,8], both of which (considering advantages and disadvantages) permit a PLOS ONE | DOI:10.1371/journal.pone.0118719 March 20, 2015
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