Technical Briefs

Characterization of the Performance of a Custom Program for Image Processing of Pressure Sensitive Film

[+] Author and Article Information
Muturi G. Muriuki1

Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15261mgmst20@pitt.edu

Lars G. Gilbertson, Christopher D. Harner

Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15261


Corresponding author.

J Biomech Eng 131(1), 014503 (Nov 21, 2008) (4 pages) doi:10.1115/1.3005150 History: Received August 28, 2007; Revised August 04, 2008; Published November 21, 2008

A custom program for the processing of pressure sensitive (Fuji) film data is presented and validated in this paper. Some of the shortcomings of previous descriptions of similar programs in literature are addressed. These shortcomings include incomplete descriptions of scan resolution, processing technique, and accuracy of results. Of these, the accuracy of results is the most important and is addressed in this study by using Fuji film calibration data. In Fuji film calibration, known loads are applied to forms with known area. The accuracy of this program and that of the two commercially available image processing programs were determined. The results of the custom program are found to be within 10% of the results from the commercial programs and from experimental data. This level of accuracy is the same reported level of accuracy of Fuji film, verifying the custom program for use in Fuji film contact pressure and area measurements.

Copyright © 2009 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Picture of calibration setup

Grahic Jump Location
Figure 2

Low Fuji film calibration data and calibration curve

Grahic Jump Location
Figure 3

8bit grayscale scans from tests 4 and 5



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