Spoofing detection system, spoofing detection method and spoofing detection program

A masquerading detection method comprising:

• obtaining a first image by imaging an inspection object from a first angle;
• detecting first feature points from the first image;
• calculating first feature point coordinates representing positions of the detected feature points;
• obtaining a second image by imaging the inspection object from a second angle;
• detecting second feature points from the second image;
• calculating second feature point coordinates representing positions of the detected feature points;
• associating the first feature point coordinates with the second feature point coordinates;
• obtaining transformed coordinates by performing a plane projective transformation for the second feature point coordinates from the second image to the first image;
• and
• determining that masquerading has been attempted when a difference between the transformed coordinates and the first feature point coordinates is equal to or smaller than a predetermined value.

A non-transitory computer-readable storage medium storing a program for causing a computer to perform:

• obtaining first feature point coordinates representing positions of first feature points from a first image of an inspection object, the first image being imaged from a first angle;
• obtaining second feature point coordinates representing positions of second feature points from a second image of the inspection object, the second image being imaged from a second angle different from the first angle;
• associating the first feature points with the second feature points;
• obtaining transformed coordinates by performing a plane projective transformation for second coordinates of the second feature points from the second image to the first image, the second feature points being associated using the first feature points and the second feature points;
• and
• determining that masquerading has been attempted when a difference between the transformed coordinates and first coordinates of the first feature points is equal to or smaller than a predetermined value.