Ears can be used for identification of humans and have been found to have
an accuracy rate of 99.6%. The human ear is thought to be an accurate
biometric, or unique anatomic characteristic used for automated
recognition, because it is less prone to changes caused by aging than are
fingerprints, which can change over time. An algorithm known as image ray
transform is used for identifying a person through the shape of his or her
outer ear. Critics of using ears as identification point out that there are
potential factors that could cause inaccurate readings, such as poor
lighting and viewing angles, as well as hair obstructing the outer ear.
Read More: http://www.wisegeek.com/can-ea
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