Estimating posture-recognition performance in sensing garments using geometric wrinkle modeling

Authors:
Holger Harms;Oliver Amft;Gerhard Tröster
Affiliations:
Wearable Computing Laboratory, Eidgenössische Technische Hochschule Zürich, Zürich, Switzerland;ETH Zürich, Wearable Computing Laboratory, Zürich, Switzerland and ACTLab, Signal Processing Systems, Technische Universiteit, Einhoven, Eindhoven, The Netherlands;Wearable Computing Laboratory, Eidgenössische Technische Hochschule Zürich, Zürich, Switzerland
Venue:
IEEE Transactions on Information Technology in Biomedicine
Year:
2010

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Abstract

A fundamental challenge limiting information quality obtained from smart sensing garments is the influence of textile movement relative to limbs.We present and validate a comprehensive modeling and simulation framework to predict recognition performance in casual loose-fitting garments. A statistical posture and wrinkle-modeling approach is introduced to simulate sensor orientation errors pertained to local garment wrinkles. A metric was derived to assess fitting, the body-garment mobility. We validated our approach by analyzing simulations of shoulder and elbow rehabilitation postures with respect to experimental data using actual casual garments. Results confirmed congruent performance trends with estimation errors below 4% for all study participants. Our approach allows to estimate the impact of fitting before implementing a garment and performing evaluation studies with it. These simulations revealed critical design parameters for garment prototyping, related to performed body posture, utilized sensing modalities, and garment fitting. We concluded that our modeling approach can substantially expedite design and development of smart garments through early-stage performance analysis.