Patent ID: 8553986

Claim:
An image processing method, comprising: (a) providing a first image having a plurality of first areas and a second image having a plurality of second areas, wherein each first area has a first feature point having the largest or the smallest grey value in the first area, and each second area has a second feature point having the largest or the smallest grey value in the second area; (b) creating a first relationship between the first feature points and a second relationship between the second feature points, wherein the step (b) comprises: (b1) creating a first ring mark for each first feature point, wherein each first ring mark records N first relative angles between the first feature point and its neighboring N first feature points, and N is an integer greater than or equal to 1; and (b2) creating a second ring mark for each second feature point, wherein each second ring mark records N second relative angles between the second feature point and its neighboring N second feature points; and (c) pairing the first feature points and the second feature points by a microprocessor according to the first and the second relationship.