title: The configuration of plantar pressure sensing cells for wearable measurement of COP coordinates.
abstract: BACKGROUND
  Wearable measurement of center of pressure (COP) coordinates is the key of obtaining the measurement of natural gait. Plantar pressure insole is the right sensing unit for plantar pressure monitoring for long-term outdoor measurements and the control of walking assisting exoskeleton robot. It's necessary to study the configuration of pressure sensing cells.
  
  
  METHODS
  This study explored the sensing cell configuration for the plantar pressure insole. The data of plantar pressure of walking is collected for layout variants. The RMSE of COP coordinates estimations are used as the evaluation criteria.
  
  
  RESULTS
  The RMSE of COP coordinates decreases from 8.00 to 3.20 mm as the amount of pressure sensing cells increases from 2 to 7. The size of pressure sensing cells contribute to reduce the RMSE of COP coordinates and 7 pressure sensing cells, with the size of 2.0-2.5 cm have the satisfying performance. Adding pressure sensing cell in the heel and hallux area increase the accuracy of estimating COP coordinates.
  
  
  CONCLUSIONS
  Comparison results indicate that the configuration of 7 pressure sensing cells has a satisfying measurement performance.
authors: School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.|Shanghai Engineering Research Center for Intelligent Diagnosis and Treatment Instrument, Shanghai, 200240, China.
authors: Dian
authors: D
authors: Wang
authors: School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China. pcai@sjtu.edu.cn.|Shanghai Engineering Research Center for Intelligent Diagnosis and Treatment Instrument, Shanghai, 200240, China. pcai@sjtu.edu.cn.
authors: Ping
authors: P
authors: Cai
authors: School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.|Shanghai Engineering Research Center for Intelligent Diagnosis and Treatment Instrument, Shanghai, 200240, China.
authors: Zhiyong
authors: Z
authors: Mao
mesh_terms: D005528:Foot; D005684:Gait; D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D011312:Pressure; D016138:Walking
keywords: COP estimation; Plantar pressure; Pressure sensing cell layout; Wearable measurement