Journal of Rehabilitation Research & Development (JRRD)

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Volume 51 Number 9, 2014
   Pages 1365 — 1376

Abstract — Effect of interpolation on parameters extracted from seating interface pressure arrays

Michael Wininger, PhD;1–2 Barbara Crane, PhD, PT2*

1Cooperative Studies Program, Department of Veterans Affairs Connecticut Healthcare System, West Haven, CT; 2Department of Rehabilitation Sciences, University of Hartford, West Hartford, CT

Abstract — Interpolation is a common data processing step in the study of interface pressure data collected at the wheelchair seating interface. However, there has been no focused study on the effect of interpolation on features extracted from these pressure maps, nor on whether these parameters are sensitive to the manner in which the interpolation is implemented. Here, two different interpolation paradigms, bilinear versus bicubic spline, are tested for their influence on parameters extracted from pressure array data and compared against a conventional low-pass filtering operation. Additionally, analysis of the effect of tandem filtering and interpolation, as well as the interpolation degree (interpolating to 2, 4, and 8 times sampling density), was undertaken. The following recommendations are made regarding approaches that minimized distortion of features extracted from the pressure maps: (1) filter prior to interpolate (strong effect); (2) use cubic interpolation versus linear (slight effect); and (3) ensure nominal difference between interpolation orders of 2, 4, and 8 times (negligible effect). We invite other investigators to perform similar benchmark analyses on their own data in the interest of establishing a community consensus of best practices in pressure array data processing.

Key words: data processing, filtering, force, interpolation, pressure array, pressure map, pressure ulcer, seating, sitting, wheelchair.

View HTML ¦ View PDF ¦ Contents Vol. 51, No.9

This article and any supplementary material should be cited as follows:
Wininger M, Crane B. Effect of interpolation on parameters extracted from seating interface pressure arrays. J Rehabil Res Dev. 2014;51(9):1365–76.
ResearcherID/ORCID: Michael Wininger, PhD: 0000-0002-7871-3292; Barbara Crane, PhD, PT: 0000-0001-7826-9243

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