2021 Volume 50 Issue 1 Pages 19-28
The aim of this study was to assess the range and pattern of shape deformation in head scans due to the presence of hair. Homologous models of head with and without hair were obtained from 9 Japanese males, and “hair” model was created for each participant. “Hair” model of each participant was added to average homologous model without hair and obtained 9 models were analyzed using multidimensional scaling (MDS) and principal component analysis (PCA). The results of MDS and PCA were similar: one size factor and some shape factors were obtained, and hair-related deformation was found to be non-uniform. The maximum thickness of the “hair” was approximately 9 mm on average at the top of the head, and thinner at the side of the head. The plausible range of deformation was estimated in the form of virtual “hair” shapes on an ellipse containing 68% of the subjects in a distribution map, which was based on the scores of the first two MDS dimensions. Our findings provide significant and specific information that may help manufacturers in designing industrial products that are worn on the head.
