Patent ID: 8081822

Claim:
A method of determining an angular position of a human finger depicted in a captured image, wherein the method is configured for execution by a computing system comprising one or more computing devices, the method comprising: accessing, by a, computing system, a first portion of a captured image, wherein the captured image comprises at least an image of a human finger; comparing, by the computing system, the first portion of the captured image to a value image at each of a plurality of angular positions of the value image, wherein the value image comprises a plurality of regions each associated with a respective weighted value and wherein a region of the value image associated with a region of interest of the human finger is assigned a higher weighted value than other regions of the value image; calculating, by the computing system, respective match values for each of the plurality of angular positions of the value image by multiplying pixels of the captured image and corresponding weighted values of the angular positions of the value image; and selecting as an angular position of the image of the human finger in the captured image the angular position of the value image associated with a highest match value.