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Signal, Image and Video Processing

, Volume 9, Issue 3, pp 623–633 | Cite as

A simple vision-based fall detection technique for indoor video surveillance

  • Jia-Luen Chua
  • Yoong Choon Chang
  • Wee Keong Lim
Original Paper

Abstract

Falls are one of the major health hazards among the aging population aged 65 and above, which could potentially result in a significant hindrance to their independent living. With the advances in medical science in the last few decades, the aging population increases every year, and thus, fall detection system at home is increasingly important. This paper presents a new vision-based fall detection technique that is based on human shape variation where only three points are used to represent a person instead of the conventional ellipse or bounding box. Falls are detected by analyzing the shape change of the human silhouette through the features extracted from the three points. Experiment results show that in comparison with the conventional ellipse and bounding box techniques, the proposed three point–based technique increases the fall detection rate without increasing the computational complexity.

Keywords

Fall detection Analysis of human shape variation computer vision 

List of Symbols

\(H\)

Height of the bounding box

\(W\)

Width of the bounding box

\(h_{R1}\)

Height of region \(R1\)

\(h_{R2}\)

Height of region \(R2\)

\(h_{R3}\)

Height of region \(R3\)

\(w_{R1}\)

Width of region \(R1\)

\(w_{R2}\)

Width of region \(R2\)

\(w_{R3}\)

Width of region \(R3\)

\((g_{R1x},\, g_{R1y})\)

Centroid coordinate of region \(R1\)

\((g_{R2x},\, g_{R2y})\)

Centroid coordinate of region \(R2\)

\((g_{R3x},\, g_{R3y})\)

Centroid coordinate of region \(R3\)

\(D1\)

Distance between \(P1\) and \(P2\)

\(D2\)

Distance between \(P2\) and \(P3\)

\(\theta _{1}\)

Orientation of the line formed by \(P1\) and \(P2\)

\(\theta _{2}\)

Orientation of the line formed by \(P2\) and \(P3\)

\(p\)

Ratio of the distance \(D1\) over \(D2\)

\(p_{t-1}\)

Ratio of the distance at previous frame

\(p_{t}\)

Ratio of the distance at current frame

\(\theta _{r}\)

Reference angle

\(D_{r}\)

Length reference

\(\theta _{N1}\)

Orientation of the line formed by \(P1\) and \(P2\) at the 10th frame after a possible fall

\(\theta _{N2}\)

Orientation of the line formed by \(P2\) and \(P3\) at the 10th frame after a possible fall

\(\theta _{D1}\)

Orientation difference between \(\theta _{N1}\) and \(\theta _{r}\)

\(\theta _{D2}\)

Orientation difference between \(\theta _{N2}\) and \(\theta _{r}\)

\(\mu _{\theta }\)

Mean of the two orientation differences, \(\theta _{D1}\) and \(\theta _{D2}\)

\(D_\mathrm{diff}\)

Change in sum of the length of the lines after a possible fall

Notes

Acknowledgments

This work was supported in part by Telekom Malaysia Research and Development (TM R&D) research grant.

Conflict of interest The authors declare that they have no competing interests.

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Copyright information

© Springer-Verlag London 2013

Authors and Affiliations

  • Jia-Luen Chua
    • 1
  • Yoong Choon Chang
    • 1
  • Wee Keong Lim
    • 1
  1. 1.Faculty of EngineeringMultimedia UniversityCyberjayaMalaysia

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