Abstract
Vein biometric system uses vein inside human body as a unique identification. Researchers have concluded that human vein pattern is unique to an individual. Vein pattern cannot be stolen or duplicated because it is in the human body. At present, vein pattern in finger, palm, palm-dorsa and wrist of human are used for biometric system. This paper presents a review on vein enhancement methods. This paper begins with overview of vein detection and the advantages of vein as biometric modal. Next, the vein capturing technology to obtain the vein pattern in human body is presented. Finally, preceding works related to vein enhancement methods are discussed and reviewed
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