An Expert Vision motion analysis system with five analog video cameras was used to evaluate the mouth movement during two facial animations (smile and puffy face). Sixteen skin markers were adhered to the face of subject according to the anatomic landmarks to represent the functional movement of the facial muscles. The trajectory of the four or eight peri-oral skin markers was simultaneously evaluated by Challis technique, instead of individual movement of single marker. The 4-marker method is a little less accurate than 8-marker method. But the 4-marker method can be incorporated as a part of our modality of facial motion analysis, including two/three dimensional displacement of individual marker and absolute/relative displacement of paired markers. It was much easy for data acqusition and no extra marker was needed in the whole modality of our facial motion analysis. Physicians can use this Challis technique to evaluate grouped movement of facial markers, as a whole, in different animation.
Improving the Face of Cosmetic Medicine: An Automatic Three-dimensional Analysis System for Facial Rejuvenation
