Method and system for characterizing keratinous fibers, in particular human eyelashes

A method for characterizing eyelashes or eyebrows which is implemented by computer and comprises the following steps, which are directed toward:

• receiving data corresponding to a set of pixels in a close-up image of a body area comprising a plurality of eyelashes, the entirety of a row of eyelashes or of an eyebrow, to be characterized;
• applying at least one computer vision step so as to obtain, on the basis of the image data received, a numerical evaluation of at least one characteristic numerical parameter from among, notably, the number of fibers, an average length of the fibers, an average thickness of the fibers, and a curvature of the fibers,
• said method being characterized in that it comprises the following additional steps:
• identifying, in the image of the body area received, a facial feature having an average size which is fixed among a population,
• determining a number of pixels which is associated with the size of the facial feature,
• converting distances determined in number of pixels into metric distance,
• determining a length of the fibers by determining a number of pixels from root to tip of each fiber, and
• determining an average length on the basis of a number of fibers which is counted;
• wherein in that the computer vision step comprises at least one step of identification by segmenting the fibers of the eyelashes or of the eyebrows;
• wherein the segmentation step is followed by at least one step of computing the parameter on the basis of the pixels classified by segmentation.