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CSME 2021/04
Volume 42 No.2
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141-149
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Development of a Portable Image-Based Plantar Pressure Measurement System
Thossaporn Kaewwichit a, Chien-Hsun Tsengb, Ke-Han Suc and Chong-Ching Changd
aDepartment of Mechanical Engineering Technology, King Mongkut's University of Technology North Bangkok, Bangkok, Thailand
bDepartment of Information Engineering, Kun Shan University, Tainan 71070, Taiwan
cDepartment of Automatic Control Engineering, Feng Chia University, Taichung 40724, Taiwan.
dGraduate Institute of Mechatronic System Engineering, National University of Tainan, Tainan 70005, Taiwan.
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Abstract:
Plantar pressure has been generally used to refer to the physical force exerted between the sole of the foot and ground contact during daily activities. Measuring plantar pressure provides data on foot in gait and posture, which is useful in footwear design, and other health-related applications for lower limb treatment and injury prevention. Therefore, to acquire accurate measurement of planta pressure is of paramount importance. To do so in a convenient and efficient fashion, this study developed a portable image-based plantar pressure measurement system. A portable pressure image box (PIB), which could be operated with any kind of portable photo-taking devices that are able to produce images with highly quantitative accuracy, was equipped to capture the needed plantar image. Based on the measurement data from 11 subjects, the performance indices of statistical metrics on mean square error (MSE) and normalized absolute error (NAE) of the 198 footprints show that the proposed PIB system could exhibit close agreement with the sensor-based Tactile pressure measurement system (TP) as a measurement reference. When compared with the high-cost image-based scanning machine (SM) system, the proposed PIB also showed better performance on plantar pressure measurement. The findings suggested the proposed PIB system could be another economical and viable option for plantar pressure measurement in assistive devices for footwear design or customized insole manufacturing.
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Keywords: Plantar pressure measurement, Sensor-based, Image-based, Portable pressure image box
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*Corresponding author; e-mail: kehsu@fcu.edu.tw
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©
2021
CSME , ISSN 0257-9731
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