Patent ID: 6185317
Filing Date: 2001-02-06
Classification: G06K

Abstract:
An image collation device for determining whether a first image inputted through a specified input means and a second image coincide with each other, comprising:means for detecting a degree of coincidence between said first and second images, said detecting means including:means for forming a plurality of linear images from said first image;means for moving each of said linear images successively on said second image and comparing overlapped pixels between said linear images and said second image;means for detecting coordinate values in said second image where the degree of similarity between said linear images and said second image is higher than a predetermined threshold;means for successively selecting detected coordinate values for said linear images to form one or more combinations of said detected coordinate values; andmeans for measuring the degree of coincidence between said first and second images by comparing the coordinate values for each of said combinations to a relative positional relationship of the linear images;means for determining whether said first image coincides with said second image based upon whether the degree of coincidence is greater than a first reference value;means for determining whether said first image coincides with said second image based upon whether the degree of coincidence is at least equal to a second reference value; andmeans for varying said first reference value according to said second reference value when the degree of coincidence between said first and second images is between said first and second references values.