ABSTRACT

The present review will focus on basic principles involved in human hair evaluation using imaging, i.e., photographic and computerized methods. The visibility of hair will depend not only on the resolution power of the optics and charge coupled device (CCD) camera but also on the natural contrast between the object, i.e., hair (with every variation of the fiber components and optical interfaces) and background (including skin as a heterogeneous and variable background and extraneous material).