Vein recognition technology was developed based on the fact that everyone has different vein patterns under their skin, and has been in the spotlight in recent days. To read a vein pattern, an ifrared lighting and filter are needed, and brightness contrast against the skin should be maximized. After extracting vein distribution information or feature data from an input digital image, save it to a database.
The information used as featured data includes overal vein shape and feature points, which are also used for fingerprinting. The light source used here is also used for a door phone, and is know to be non-harmful.

• Advantages and Disadvantages of Vein Recognition
• Advantages
  
  Since veins are under the skin, its authentication information is hardly corrupted. Therefore, it is safe to obtain and use the biometric information.
  
  It is difficult to replicate veins because they are not seen with the naked eye.
• Disadvantages
  
  It is not yet fully proved that biometric authentication information is permanent and unique.
• The equipment using an infrared camera is expensive, and its size is huge