Patent ID: 9460335
Filing Date: 2016-10-04
CPC Classification: G06K,H04N

Claim Text:
1. A method of detecting a venous network in a portion of a human body, the method comprising the steps of: capturing an infrared image of said human body portion in order to reveal a venous network of said human body portion; analyzing contrast in the infrared image in order to determine contrast characteristics of the infrared image; and determining whether the human body portion is real on the basis of contrast characteristics determined in the infrared image and of contrast characteristics determined from reference human body portions, wherein the method comprises a configuration stage and a detection stage, the configuration stage comprising the steps of: capturing infrared images of human body portions and representations of venous networks; isolating blocks of pixels in each image and performing contrast analysis to determine for each block a directional gradient; determining average energies for the directional gradients; and determining by training average energy thresholds for discriminating between an image of a venous network captured directly from a human body portion and an image of a venous network captured from a representation of a venous network; the detection stage comprising the steps of: capturing at least one infrared image of a venous network; isolating blocks of pixels in the image and performing contrast analysis to determine for each block a directional gradient; determining average energies of the directional gradients; and comparing these average energies with the thresholds in order to verify that the image of the venous network was captured directly from a human body portion.