Patent ID: 6236749
Filing Date: 2001-05-22
Classification: G06K

Abstract:
An image recognition method comprising:a first step of obtaining quantified image signals by inputting luminance or chromatic signals of all the pixels of a two-dimensional image into a nonlinear table, the two-dimensional image having been obtained by scanning an object in a three-dimensional space; anda second step of dividing the two-dimensional image, obtained by the first step, into several rectangular elements and obtaining number of pixels belonging to each quantified scale of luminance or chromatic signal in each of the rectangular elements;wherein the nonlinear table is constructed such that, in histogram distribution of scales which has been obtained by quantizing the input image signals of all the pixels of the two-dimensional image, the histogram of the quantified pixels belonging to each of the scales is equalized;and wherein a feature pattern of the two-dimensional image obtained from the object in the three-dimensional space is represented by a three-dimensional matrix (x, y, z) by using a pixel number at a horizontal coordinate (x), a pixel number at a vertical coordinate (y) and a coordinate (z) representing an intensity of the quantified image signal within each said rectangular element obtained by performing the first and the second steps.