Patent ID: 6304673
Filing Date: 2001-10-16
Classification: G06K

Abstract:
A method for abstracting feature points from a seal print, comprising the following steps:obtain a digitized image of a seal print;locate a central point (C) of the obtained image (MI) directly;select a number of sectional blocks from said obtained image (MI) relative to said central point;locate a center of mass in each selected sectional block to obtain a matrix of centers of mass; andrecord said matrix as a matrix of feature points of said obtained image (MI);characterized in that coordinates of said centers of mass (xc,yc) in said sectional blocks are obtained from the following equation: ##EQU6##wherein xi and yi represent x and y coordinates of pixels of a sectional block in said sectional block, n is the number of pixels in the sectional block, and .PHI.(xi,yi) has two possible values:.PHI.(xi,yi)=1 when (xi,yi) is a pixel representing the seal print, and.PHI.(xi,yi)=0 when (xi,yi) is a non-seal print pixel.