Facial feminization surgery the lower lip and is at the edges of the chin. Males tend to have a much more prominent Adam's apple than females following puberty. The Adam's apple can be reduced with a procedure called a chondrolaryngoplasty; the goal of the procedure is to reduce the size without leaving a scar. There are risks of damage to the vocal cords and destabilization of the epiglottis. Beautification and rejuvenation procedures are often performed at the same time as facial feminisation. For example, it is common for eye bags and sagging eyelids to be corrected with a procedure called "blepharoplasty" and many
Facial motion capture deformable surface models and other techniques to track the desired facial features from frame to frame. This technology is much less cumbersome, and allows greater expression for the actor. These vision based approaches also have the ability to track pupil movement, eyelids, teeth occlusion by the lips and tongue, which are obvious problems in most computer animated features. Typical limitations of vision based approaches are resolution and frame rate, both of which are decreasing as issues as high speed, high resolution CMOS cameras become available from multiple sources. The technology for markerless face tracking is related to that in a