ID card, ID card issuing device, and ID card reading device,申请号US20020316975-传众专利搜索

ID card, ID card issuing device, and ID card reading device

申请公布号：US2004050931(A1)

申请号：US20020316975

申请日期：2002.12.10

申请公布日期：2004.03.18

申请人：

KOWA CO., LTD.

发明人：ONO TSUKASA;EGAWA YUKI

分类号：B42D15/10;G06K5/00;G06K7/00;G06K17/00;G06K19/067;G06K19/10;G09C5/00;H04L9/32;H04N1/387;(IPC1-7):G06K5/00

主分类号：B42D15/10

摘要：The technique of the present invention assumes a watermark image including ID information as an image located in a frequency domain and makes the whole watermark image subjected to an inverse transform from the frequency domain to generate a transformed image. The technique subsequently adds the transformed image to a photographic image to obtain an embedded image with the ID information embedded therein as a digital watermark. The technique then records the embedded image in a predetermined card by means of printing, so as to issue an ID card. This arrangement enables easy detection of any illegal alteration of the ID card, for example, falsification of the photographic image.