Image feature extraction method and image compression method

Abstract

The image feature extraction method of the present invention includes: the step of performing kdividing process at least once on a given image so as to convert the given image into a multi-divided image, where the kdividing process comprises the steps of: a) creating matrix T based on image matrix X; b) computing singular values of the matrix T; c) determining whether or not min|σ−σ|>ε; d) if the result of the determination in the step c) is 'No', returning to the step c) subsequent to computing the singular values of the enlarged matrix T; e) if the result of the determination in the step c) is 'Yes', obtaining U which satisfies T=USV; f) obtaining matrix T=UT; and g) creating image matrix Xbased on matrix T.