| 摘要 |
<p>The invention describes the first practical, cost effective, truly non-contact implementation of a subcutaneous vein pattern biometric sensor. A laser diode (LD) (203) illuminates the hand in such a way that the pattern of reflected radiation (213), when viewed by a conventional vein pattern infrared imager (102), provides a direct measure of target range. Said target range measurement is used to create a visual or audio signal (110, 104) that instructs the individual being scanned to place the hand (101) at precisely the optimum range, such that the vein pattern is in focus. Furthermore, a system and apparatus are described to direct the individual being scanned to move the hand to an optimal horizontal registration or position with respect to the infrared imager.</p> |
