Abstract

Behavior analysis of construction safety systems is of fundamental importance to avoid accidental injuries. Traditionally, measurements of dynamic actions in civil engineering have been done through accelerometers, but high-speed cameras and image processing techniques can play an important role in this area. Here, we propose using morphological image filtering and Hough transform on high-speed video sequence as tools for dynamic measurements on that field. The presented method is applied to obtain the trajectory and acceleration of a cylindrical ballast falling from a building and trapped by a thread net. Results show that safety recommendations given in construction codes can be potentially dangerous for workers.

© 2013 Optical Society of America

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References

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  1. B. Ferrer, J. Espinosa, J. Perez, S. Ivorra, and D. Mas, “Optical scanning for structural vibration measurement,” Res. Nondestruct. Eval. 22, 61–75 (2011).
    [CrossRef]
  2. H. N. Nassif, M. Gindy, and J. Davis, “Comparison of laser Doppler vibrometer with contact sensors for monitoring bridge deflection and vibration,” NDT & E Int. 38, 213–218 (2005).
    [CrossRef]
  3. D. Mas, J. Espinosa, A. B. Roig, B. Ferrer, J. Perez, and C. Illueca, “Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques,” Appl. Opt. 51, 2664–2671 (2012).
    [CrossRef]
  4. EN 13374 “Temporary edge protection systems—product specification, test methods,” European Commitee for Standardization (2004).
  5. J. C. Pomares, E. G. Segovia, and R. Irles, “Personal protection rails for strong impacts,” in Fourth International Conference on Safety and Security Engineering (SAFE, 2011).
  6. M. Voshell, “High acceleration and the human body,” http://csel.eng.ohio-state.edu/voshell/gforce.pdf .
  7. R. Irles and J. C. Pomares, “Sistema de protección de bordes para barandillas tipo B y tipo C,” Patent pending no. P201130987 (14June2011).
  8. Matlab image processing toolbox (Mathworks Inc.), http://www.mathworks.es/help/toolbox/images/ .
  9. R. C. Gonzalez, R. E. Woods, and S. L. Eddins, Digital Image Processing Using MATLAB (Prentice-Hall, 2003).
  10. L. Shapiro and G. Stockman, Computer Vision (Prentice-Hall, 2001).
  11. B. Ferrer, J. C. Pomares, R. Irles, J. Espinosa, and D. Mas, “High speed image techniques for construction safety net monitoring in outdoor conditions,” Proc. SPIE 8436, 84361B (2012).
    [CrossRef]

2012 (2)

B. Ferrer, J. C. Pomares, R. Irles, J. Espinosa, and D. Mas, “High speed image techniques for construction safety net monitoring in outdoor conditions,” Proc. SPIE 8436, 84361B (2012).
[CrossRef]

D. Mas, J. Espinosa, A. B. Roig, B. Ferrer, J. Perez, and C. Illueca, “Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques,” Appl. Opt. 51, 2664–2671 (2012).
[CrossRef]

2011 (1)

B. Ferrer, J. Espinosa, J. Perez, S. Ivorra, and D. Mas, “Optical scanning for structural vibration measurement,” Res. Nondestruct. Eval. 22, 61–75 (2011).
[CrossRef]

2005 (1)

H. N. Nassif, M. Gindy, and J. Davis, “Comparison of laser Doppler vibrometer with contact sensors for monitoring bridge deflection and vibration,” NDT & E Int. 38, 213–218 (2005).
[CrossRef]

Davis, J.

H. N. Nassif, M. Gindy, and J. Davis, “Comparison of laser Doppler vibrometer with contact sensors for monitoring bridge deflection and vibration,” NDT & E Int. 38, 213–218 (2005).
[CrossRef]

Eddins, S. L.

R. C. Gonzalez, R. E. Woods, and S. L. Eddins, Digital Image Processing Using MATLAB (Prentice-Hall, 2003).

Espinosa, J.

B. Ferrer, J. C. Pomares, R. Irles, J. Espinosa, and D. Mas, “High speed image techniques for construction safety net monitoring in outdoor conditions,” Proc. SPIE 8436, 84361B (2012).
[CrossRef]

D. Mas, J. Espinosa, A. B. Roig, B. Ferrer, J. Perez, and C. Illueca, “Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques,” Appl. Opt. 51, 2664–2671 (2012).
[CrossRef]

B. Ferrer, J. Espinosa, J. Perez, S. Ivorra, and D. Mas, “Optical scanning for structural vibration measurement,” Res. Nondestruct. Eval. 22, 61–75 (2011).
[CrossRef]

Ferrer, B.

D. Mas, J. Espinosa, A. B. Roig, B. Ferrer, J. Perez, and C. Illueca, “Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques,” Appl. Opt. 51, 2664–2671 (2012).
[CrossRef]

B. Ferrer, J. C. Pomares, R. Irles, J. Espinosa, and D. Mas, “High speed image techniques for construction safety net monitoring in outdoor conditions,” Proc. SPIE 8436, 84361B (2012).
[CrossRef]

B. Ferrer, J. Espinosa, J. Perez, S. Ivorra, and D. Mas, “Optical scanning for structural vibration measurement,” Res. Nondestruct. Eval. 22, 61–75 (2011).
[CrossRef]

Gindy, M.

H. N. Nassif, M. Gindy, and J. Davis, “Comparison of laser Doppler vibrometer with contact sensors for monitoring bridge deflection and vibration,” NDT & E Int. 38, 213–218 (2005).
[CrossRef]

Gonzalez, R. C.

R. C. Gonzalez, R. E. Woods, and S. L. Eddins, Digital Image Processing Using MATLAB (Prentice-Hall, 2003).

Illueca, C.

Irles, R.

B. Ferrer, J. C. Pomares, R. Irles, J. Espinosa, and D. Mas, “High speed image techniques for construction safety net monitoring in outdoor conditions,” Proc. SPIE 8436, 84361B (2012).
[CrossRef]

R. Irles and J. C. Pomares, “Sistema de protección de bordes para barandillas tipo B y tipo C,” Patent pending no. P201130987 (14June2011).

J. C. Pomares, E. G. Segovia, and R. Irles, “Personal protection rails for strong impacts,” in Fourth International Conference on Safety and Security Engineering (SAFE, 2011).

Ivorra, S.

B. Ferrer, J. Espinosa, J. Perez, S. Ivorra, and D. Mas, “Optical scanning for structural vibration measurement,” Res. Nondestruct. Eval. 22, 61–75 (2011).
[CrossRef]

Mas, D.

D. Mas, J. Espinosa, A. B. Roig, B. Ferrer, J. Perez, and C. Illueca, “Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques,” Appl. Opt. 51, 2664–2671 (2012).
[CrossRef]

B. Ferrer, J. C. Pomares, R. Irles, J. Espinosa, and D. Mas, “High speed image techniques for construction safety net monitoring in outdoor conditions,” Proc. SPIE 8436, 84361B (2012).
[CrossRef]

B. Ferrer, J. Espinosa, J. Perez, S. Ivorra, and D. Mas, “Optical scanning for structural vibration measurement,” Res. Nondestruct. Eval. 22, 61–75 (2011).
[CrossRef]

Nassif, H. N.

H. N. Nassif, M. Gindy, and J. Davis, “Comparison of laser Doppler vibrometer with contact sensors for monitoring bridge deflection and vibration,” NDT & E Int. 38, 213–218 (2005).
[CrossRef]

Perez, J.

Pomares, J. C.

B. Ferrer, J. C. Pomares, R. Irles, J. Espinosa, and D. Mas, “High speed image techniques for construction safety net monitoring in outdoor conditions,” Proc. SPIE 8436, 84361B (2012).
[CrossRef]

R. Irles and J. C. Pomares, “Sistema de protección de bordes para barandillas tipo B y tipo C,” Patent pending no. P201130987 (14June2011).

J. C. Pomares, E. G. Segovia, and R. Irles, “Personal protection rails for strong impacts,” in Fourth International Conference on Safety and Security Engineering (SAFE, 2011).

Roig, A. B.

Segovia, E. G.

J. C. Pomares, E. G. Segovia, and R. Irles, “Personal protection rails for strong impacts,” in Fourth International Conference on Safety and Security Engineering (SAFE, 2011).

Shapiro, L.

L. Shapiro and G. Stockman, Computer Vision (Prentice-Hall, 2001).

Stockman, G.

L. Shapiro and G. Stockman, Computer Vision (Prentice-Hall, 2001).

Woods, R. E.

R. C. Gonzalez, R. E. Woods, and S. L. Eddins, Digital Image Processing Using MATLAB (Prentice-Hall, 2003).

Appl. Opt. (1)

NDT & E Int. (1)

H. N. Nassif, M. Gindy, and J. Davis, “Comparison of laser Doppler vibrometer with contact sensors for monitoring bridge deflection and vibration,” NDT & E Int. 38, 213–218 (2005).
[CrossRef]

Proc. SPIE (1)

B. Ferrer, J. C. Pomares, R. Irles, J. Espinosa, and D. Mas, “High speed image techniques for construction safety net monitoring in outdoor conditions,” Proc. SPIE 8436, 84361B (2012).
[CrossRef]

Res. Nondestruct. Eval. (1)

B. Ferrer, J. Espinosa, J. Perez, S. Ivorra, and D. Mas, “Optical scanning for structural vibration measurement,” Res. Nondestruct. Eval. 22, 61–75 (2011).
[CrossRef]

Other (7)

EN 13374 “Temporary edge protection systems—product specification, test methods,” European Commitee for Standardization (2004).

J. C. Pomares, E. G. Segovia, and R. Irles, “Personal protection rails for strong impacts,” in Fourth International Conference on Safety and Security Engineering (SAFE, 2011).

M. Voshell, “High acceleration and the human body,” http://csel.eng.ohio-state.edu/voshell/gforce.pdf .

R. Irles and J. C. Pomares, “Sistema de protección de bordes para barandillas tipo B y tipo C,” Patent pending no. P201130987 (14June2011).

Matlab image processing toolbox (Mathworks Inc.), http://www.mathworks.es/help/toolbox/images/ .

R. C. Gonzalez, R. E. Woods, and S. L. Eddins, Digital Image Processing Using MATLAB (Prentice-Hall, 2003).

L. Shapiro and G. Stockman, Computer Vision (Prentice-Hall, 2001).

Supplementary Material (4)

» Media 1: MOV (3248 KB)     
» Media 2: AVI (1709 KB)     
» Media 3: MOV (3248 KB)     
» Media 4: MOV (17934 KB)     

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Figures (9)

Fig. 1.
Fig. 1.

(a) General view of the experiment. (b) Slopes of working surface and net.

Fig. 2.
Fig. 2.

(Media 1) Video of the experiment at 30 fps.

Fig. 3.
Fig. 3.

Scheme of the setup with the high-speed camera location.

Fig. 4.
Fig. 4.

Manual selection of three point of the circle (blue crosses) to obtain the center of the circle (red dot).

Fig. 5.
Fig. 5.

Image after image processing method.

Fig. 6.
Fig. 6.

Final result of the Hough transform, with the maximum locating the center of the circumference. Units are in pixels and height units are arbitrary.

Fig. 7.
Fig. 7.

Sequence of center detection (Media 2) and trajectory of the cylinder trapped by the net.

Fig. 8.
Fig. 8.

Second derivative of the trajectory fittings to different polynomial degrees.

Fig. 9.
Fig. 9.

Comparison results of acceleration obtained from accelerometer and form image processing methods (only the 6th degree polynomial fitting has been plotted).

Metrics