Image collation method and image collation device

PURPOSE:To perform the collation of two binary pictures at high speed for the identification of an image and to reduce the memory capacity of registration information. CONSTITUTION:In an image collation device 1 performing the collation of first and second pictures to be binary pictures, the aggregation of more than one black picture element is treated as a line, the respective black picture element address of a first conversion picture obtained by performing a processing of the line width of the first picture by a fine processing means of the line width designated value which is less than an original line width is stored as registration information in a memory 6, the second picture 2 is stored in an image memory 4, and the coincidence degree of the first picture and second picture is decided by a processor 5 by the collation processing means of the registration information of the first picture and the respective black picture element address of a second conversion picture obtained by performing a processing of the line width designated value by the fine processing means including the case where the line width of the second picture is remained as the original one, in the collation of the first picture and second picture.