| 主权项 |
1. A vein pattern recognition based biometric system comprising
i. a hand placement unit and a detection unit being configured to inform a computing device about the presence of a hand for processing; said hand placement unit comprises
a portion to rest flat portion of the palm,a plurality of buttons to be pressed by thumb that indicate whether a left or right hand has been placed,a concavity to rest a fleshy part of the palm, anda portion to guide the wrist for alignment and a protrusion that separates the middle finger and the ring finger; ii. an illuminating and imaging unit that comprises a bright object placed in the field of view of the illuminating and imaging unit that illuminates a region of interest with uniformly diffused near-infrared light; iii. a feature extraction unit that extracts a vascular pattern from an image captured by the imaging device that represents the pattern as line-segment-hypothesis and binarized imagine; and iv. a recognition unit that compares the extracted line-segment-hypothesis and binarized image with a stored line-segment-hypothesis and binarized image to authenticate the vein pattern, by:
constructing a matrix with live pattern segments and recorded pattern segments;initializing a cumulative hausdorff distance to zero;filling the matrix representing line segment hausdorff between predetermined segment (h) of the live pattern and the predetermined segment (k) of the recorded pattern;selecting the smallest element from the filled matrix and incrementing the hausdorff distance with the selected element;filling all the elements of row h and column k of the matrix with positive and negative infinity respectively; andchecking if the predetermined segments (h and k) in the live pattern and recorded pattern, respectively, correspond to a merged segment, and if so, filling all the rows corresponding to the core segments of h and columns corresponding to the core segments of k, respectively, with infinity. |
