1. A method for matching key pixels of two images, comprising: determining, for a key pixel to be matched of a first image, a first eigenvector, in a set of eigenvectors of a second image, matching an eigenvector of the key pixel to be matched, wherein the set of eigenvectors of the second image includes eigenvectors of respective key pixels of the second image; determining a second eigenvector, in a set of eigenvectors of the first image, matching the first eigenvector, wherein the set of eigenvectors of the first image includes eigenvectors of respective key pixels of the first image; and determining the key pixel to be matched and a key pixel corresponding to the first eigenvector as a pair of matching pixels when a coordinate vector of the key pixel to be matched is the same as a coordinate vector of a key pixel corresponding to the second eigenvector; wherein the key pixel to be matched and the key pixel corresponding to the first eigenvector are determined not as a pair of matching pixels when the coordinate vector of the key pixel to be matched is not the same as the coordinate vector of the key pixel corresponding to the second eigenvector.