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B.1.2. Feature Based Algorithms Analysis

1823 words - 8 pages

Aging is an inevitably process in the development of the body that involve physical changes of various parts of the body. It is characterized by an uncontrolled alteration of various organs and tissue that consequently affect the physical appearance. Facial aging involves a series of bone movements and growths as well as skin transformations that alter the appearance of the face. Other changes include the thinning of the skin and loss of fats underneath it, leading to a loss of skin elasticity. Fat is especially loss below the skin in the cheeks, temples, chin, nose and eye resulting to sunken eye and skeletal appearance. Consequently, the skin texture is altered due to the development of wrinkles as fats can no longer holds on to the skin surface providing cushioning to the skin making its surface smooth. Aging also promotes the re-shaping of certain bones (skeletal bones). Notable change in bone shape is observable on the upper and lower jaw, eye socket and nose.
The development of the body during the aging process does not follow is strict model where the type and rate of changes are constant from person to person. Instead, the rate of these changes varies with person, age, region, life choices (nutrition, stress management, physical activity), genetic and environment. This variation causes the challenge of face recognitions across uncontrolled facial alterations due to the inability to build a universal model that can depict pre- and post-aging appearances of an input face.
Plastic surgery is a medical procedure involving the various types of alteration of the outer appearance of organs through cosmetic and reconstructive procedures. Alterations vary from reconstructive processes (such as altering birth deformities or traumatic injuries) to cosmetic processes such as an increase in an organ size, a modification of an organ shape, a repositioning of an organ or a total removal/replacement of an organ. Some facial plastic surgery procedures include eyelid surgery, laser skin resurfacing, and nose job.
Plastic surgery is becoming more popular and is mostly used to counteract the damages left by aging on the exposed parts of the body, notably, the face. According to the results of the study published in the Archives of Facial Plastic Surgery, the more procedures a patient has, the greater the difference between estimates of their age before and after surgery. The author of the study noted that the effect was "unrelated to the preoperative age of a patient and unaffected by other variables that we investigated".
Plastic surgery is therefore a procedure that redefines a given face at various extents. This redefinition can meet some extremities that render the altered faced unidentifiable to the initial face input by visual inspection. Such extreme alterations pose a challenge on face recognition algorithms which are built to use existing unaltered input about a face to correctly recognize a new input.


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