The arrangement of veins is a unique characteristic of an individual. Identification is performed by means of a detector (9) which scans a region of the skin (6) and detects the position of subcutaneous blood vessels (8) by measurement of a parameter such as the reflection of incident radiation. Comparison...http://www.google.ca/patents/US4699149?utm_source=gb-gplus-sharePatent US4699149 - Apparatus for the identification of individuals
