|Vertical axis is logrithmic. Absorbance coefficients of three types of chemicals found in the human body.|
"Accuvein" is the brand name of a tool that uses NIR to help phlebotomists visualize blood vessel. The basic technology of the tool is to scan the skin surface with a near-infrared laser and record images of the resulting reflectance. The tool then replicates the pixel-image by projecting it back on to the surface using a visible laser.
The original NIR laser frequency is chosen based on high hemoglobin absorbance compared to water, skin and fat cells.
Given the mature state of fingerprint recognition, a relatively high degree of discrimination based on recognition of a vein print of your forehead or nose would not be technically challenging.
"But now machines we’ve created have surpassed us, at least in processing speed. Earlier this year, for example, researchers at Nanyang Technological University, in Singapore, focused a computer network on a data set of 1.2 million images; the computer then tried to identify all the pictured objects in just 90 seconds, or 0.000075 seconds an image."
What is driving face recognition? Target acquisition?