An algorithm for approximate crinkle artifact compensation in pressure-sensitive film recordings

Nancy J. Caldwell, Joseph E. Hale, M. James Rudert, Thomas D. Brown

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


An objective, empirically based image-processing technique was devised to compensate for the presence of crinkle artifact in Pressensor pressure-sensitive film recordings. A spherical indentor was used to produce film stains which deliberately included radially directed artifact streaks, superimposed upon otherwise smooth, nearly axisymmetric stain recordings. An interactive, threshold-based search algorithm was developed to delineate explicitly the perimeters of specific artifacts present within manually (cursor) circumscribed regions where crinkle features were visually apparent. Three mathematical artifact transformation operators were parametrically evaluated in terms of their ability to approximate objectively the corresponding artifact-free axisymmetric pressure fields. All three operators were found to reduce substantially the quantitative deviation from the idealized distributions. When appropriately tuned transformation operators were applied to typical in vitro intraarticular contact stains, the visual prominence of crinkle artifact features was markedly reduced.

Original languageEnglish (US)
Pages (from-to)1001-1009
Number of pages9
JournalJournal of Biomechanics
Issue number8
StatePublished - Aug 1993

Bibliographical note

Funding Information:
Acknowledgements-Thea uthors appreciatet he technical assistancoef Mr DouglasR . PedersenF.i nancials upportw as providedb y NIH Grant AR-38916a, nd by the Universityo f Iowa UndergraduateS cholarA ssistantshipP rogram.


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