METHOD AND SYSTEM FOR COMPARING IMAGES

摘要

A method for comparing a first image with a second image is provided. The method comprises identifying first keypoints in the first image and second keypoints in the second image and associating each first keypoint with a corresponding second keypoint in order to form a corresponding keypoint match. For each pair of first keypoints, the method further comprises calculating the distance therebetween for obtaining a corresponding first length. Similarly, for each pair of second keypoints, the method comprises calculating the distance therebetween for obtaining a corresponding second length. The method further comprises calculating a plurality of distance ratios; each distance ratio is based on a length ratio between a selected one between a first length and a second length and a corresponding selected one between a second length and a first length, respectively. The method still further includes calculating a statistical distribution of the plurality of distance ratios and generating a model function expressing a statistical distribution of further distance ratios corresponding to a random selection of keypoints in the first and second images. The method includes comparing said statistical distribution of the plurality of distance ratios with said model function, and assessing whether the first image contains a view of an object depicted in the second image based on said comparison.