抄録
The counterfeiting and illegal use of ID cards have become problems as the cards are used more in society. To prevent the problems, systems that authenticate ID cards by embedding digital watermarks in the facial images of the cards have been researched. In previous research, the facial images of the cards were taken with scanners, but our system uses a video camera. A user shows an ID card in front of the video camera, and the facial image on the card is extracted from the motion picture. After the card shape is corrected, a watermark is detected. To detect a watermark from a motion picture shot by the video camera, the robustness and the calculation processing time of a previous watermarking method using DFT and spread spectrums were improved. An experiment to detect watermarks from ID cards was conducted, and the utility of this system was shown.
