Method for processing image and system processing the same

An image processing system, comprising:

• an image providing unit used for 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 each second area in the second feature point;
• an information creating unit used for creating a first relationship between the first feature points and a second relationship between the second feature points, wherein the first relationship comprises a first ring mark of each first feature point and a second ring mark of each second feature point, each first ring mark records N first relative angles between each first feature point and its neighboring N first feature point, each second ring mark records N second relative angles between each second feature point and its neighboring N second feature point, and N is an integer greater than or equal to 1;
• and
• a pairing unit used for pairing the first feature points and the second feature points according to the first and the second relationship.