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Electronic system for step width estimation using programmable system-on-chip technology and time of flight cameras.

Yamir H Bolaños1, Carlos F Rengifo2, Pablo E Caicedo1

  • 1Faculty of Electronic Engineering, Corporation Universitaria Autónoma del Cauca, Colombia.

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Summary

This study introduces a low-cost portable electronic system for measuring step width during gait, aiding fall risk assessments. The system uses force sensitive resistors and time-of-flight cameras for accurate gait analysis.

Keywords:
Human gaitMotion capturePOMA testProgramming system on chipStep widthTime-of-flight camera

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Area of Science:

  • Biomechanics
  • Medical Instrumentation
  • Gerontology

Background:

  • Fall risk assessment is crucial for elderly mobility.
  • The Performance Oriented Mobility Assessment (POMA) includes gait analysis.
  • Accurate measurement of gait parameters like step width is essential.

Purpose of the Study:

  • To develop and validate a low-cost, portable electronic system for estimating step width.
  • To support the Walking Stance item of the POMA test.
  • To provide an accessible tool for gait analysis in fall risk assessment.

Main Methods:

  • A portable system with two sensing nodes (Force Sensitive Resistor and Time-of-Flight camera) and a concentrator was designed.
  • Force Sensitive Resistors were placed in shoes to detect heel-ground contact.
  • Time-of-Flight cameras measured distance to a side barrier to calculate step width.

Main Results:

  • The system wirelessly transmitted data to a PC for step width calculation.
  • Validation against infrared motion capture (Vicon Corp.) showed a mean error of 11.4% ± 5.5%.
  • The system demonstrated feasibility for portable gait analysis.

Conclusions:

  • The proposed system offers a viable, low-cost solution for estimating step width.
  • This technology can enhance the accuracy and accessibility of fall risk assessments.
  • Further research can refine the system for broader clinical application.