公开(公告)号：EP3219505A4

公开(公告)日：2018-06-20

申请号：EP15858323

申请日：2015-09-04

申请人： DAINIPPON PRINTING CO LTD

发明人： AOYAMA YUKO ,  YAMAKAWA TOSHIHISA ,  SABASHI ATSUHIRO ,  KATOU DAIKI

IPC分类号： B41M3/14 ,  B42D25/26 ,  B42D25/30 ,  B42D25/342 ,  G07D7/20

CPC分类号： G06K19/10 ,  B41M3/14 ,  B42D25/26 ,  B42D25/30 ,  B42D25/342 ,  B42D25/378 ,  G06K7/1417 ,  G06K7/1443 ,  G06K19/06037 ,  G07D7/005 ,  G07D7/20

摘要： Provided are an information recording object, a reading device and a program devised so that embedded information is difficult to guess. The information recording object 30 provided with a combined image comprising an image C1 printed in a lustrous layer 31 and an image C2 formed on the image C1 and printed in a transparent layer 32 is characterized in that: the image C1 and the image C2 are each printed with an ink for which the amount of reflected light differs according to viewing angle; for the combined image, one image is visible depending on the viewing angle; the image C2 is an image in which there is a regularity in feature points in a spatial frequency domain F2; and the image C1 is an image in which the feature points in a spatial frequency domain F1 are disposed at positions that block said regularity.