Facial Comparison

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In the Forensic Science field as well as the majority of the judicial field's facial comparison has many uses. These include: identifying victims of crime; identifying those who commit crimes and sometimes even giving back someone's original identity.
Originally this field was limited to mainly facial reconstruction using bone markers; sketching and if bodies were not too badly damaged or decomposed then one on one comparison using photos and photos; photos and sketch or either of the already mentioned and the corpse or live person.
Due to the increased use of computers and their potential to improve identification methods many comparison methods have had software developed to assist in the speed and accuracy of methods used. This use of technology also gave opportunity for other specialized methods to be developed like more accurate projection of what a missing person will or does look like when they may be found.
Facial comparison is not only used in these ways, they are also used in identifying if pieces of art were actually made of a certain person or not. One example of this would be the verification that a miniature portrait painting really was of a young Abraham Lincoln although it did not resemble the commonly accepted "look" of Mr Lincoln.

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Picture Source:
http://media.photobucket.com/image/post%20mortem/Zanko123/OrangeSocks.jpg?o=149