The three dimensional (3D) reconstruction of movement from videos is widely utilized as a method for spatial analysis of movement. Several approaches exist for a 3D reconstruction of movement using 2D video projection, most of them require the use of at least two cameras as well as the application of relatively complex algorithms. While a few approaches also exist for 3D reconstruction of movement with a single camera, they are not widely implemented due to tedious and complicated methods of calibration. Here we propose a simple method that allows for a 3D reconstruction of movement by using a single projection and three calibration markers. Such approach is made possible by tracking the change in diameter of a moving spherical marker within a 2D projection. In order to test our model, we compared kinematic results obtained with this model to those with the commonly used approach of two cameras and Direct Linear Transformation (DLT). Our results show that such approach appears to be in line with the DLT method for 3D reconstruction and kinematic analysis. The simplicity of this method may render it approachable for both clinical use as well as in uncontrolled environments.

3D reconstruction of human movement in a single projection by dynamic marker scaling / Cohen, Erez James; Bravi, Riccardo; Minciacchi, Diego. - In: PLOS ONE. - ISSN 1932-6203. - ELETTRONICO. - 12:(2017), pp. e0186443-e0186443+19. [10.1371/journal.pone.0186443]

3D reconstruction of human movement in a single projection by dynamic marker scaling

COHEN, EREZ JAMES;BRAVI, RICCARDO;MINCIACCHI, DIEGO
2017

Abstract

The three dimensional (3D) reconstruction of movement from videos is widely utilized as a method for spatial analysis of movement. Several approaches exist for a 3D reconstruction of movement using 2D video projection, most of them require the use of at least two cameras as well as the application of relatively complex algorithms. While a few approaches also exist for 3D reconstruction of movement with a single camera, they are not widely implemented due to tedious and complicated methods of calibration. Here we propose a simple method that allows for a 3D reconstruction of movement by using a single projection and three calibration markers. Such approach is made possible by tracking the change in diameter of a moving spherical marker within a 2D projection. In order to test our model, we compared kinematic results obtained with this model to those with the commonly used approach of two cameras and Direct Linear Transformation (DLT). Our results show that such approach appears to be in line with the DLT method for 3D reconstruction and kinematic analysis. The simplicity of this method may render it approachable for both clinical use as well as in uncontrolled environments.
2017
12
e0186443
e0186443+19
Goal 3: Good health and well-being for people
Cohen, Erez James; Bravi, Riccardo; Minciacchi, Diego
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1100379
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