Patent ID: 8345985
Filing Date: 2013-01-01
Classification: G06K

Abstract:
1. A method of extracting feature data of an image, the method being performed by a processor of an electronic device, the method comprising: (a) reading the image, wherein the image is a grayscale image; (b) computing a grayscale center of the image, wherein the grayscale center is a mean location of all the gray values in the image, where the grayscale center is computed by: wherein, (r 0 , c 0 ) is the grayscale center, i represents each row of the image, j represents each column of the image, and g ij represents a gray value of the point (i, j) in the image; (c) dividing the image into n equal parts D wherein, (i′ j′) is a point in the part D k , (i, j) is a point in the image, r i′j′ represents a distance between the point (i′, j′) and the grayscale center(r 0 , c 0 ), r ij represents a distance between the point (i, j) and the grayscale center (r 0 , c 0 ), g i′j′ represents a gray value of the point (i′, j′), and g ij represents a gray value of the point (i, j); and (d) regarding the n grayscale densities V