How to use fractal dimensions to qualify writings and writers

Handwriting is a very special material as it is both a copy of a model as well as the result of very complex biological mechanisms. We have explored the domain showing the interest of a study relying on fractal principle. We attempt to justify the fractal behavior and fractal approach used here, and introduce some applications of our study in the medical field and in the field of handwriting recognition or authentication. Four new parameters are defined and experimented.