AN ALGORITHM FOR APPROXIMATE CRINKLE ARTIFACT COMPENSATION IN PRESSURE-SENSITIVE FILM RECORDINGS

被引:14
作者
CALDWELL, NJ [1 ]
HALE, JE [1 ]
RUDERT, MJ [1 ]
BROWN, TD [1 ]
机构
[1] UNIV IOWA,DEPT BIOMED ENGN,IOWA CITY,IA 52242
关键词
D O I
10.1016/0021-9290(93)90060-R
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
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.
引用
收藏
页码:1001 / 1009
页数:9
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