A Fast and Robust Digital Watermark Detection Scheme for Cellular Phones
Takao Nakamura, Atsushi Katayama, Ryo Kitahara, Kenji Nakazawa · 2006
We describe a fast and robust digital watermark detection scheme for camera-equipped cellular phones that enables users to follow links embedded invisibly in printed photographs to related information on the Internet. The scheme consists of two processes: correcting geometric distortions of the captured image and detecting watermark information in the corrected image. We implemented this scheme as a Java application on a cellular phone. Experimental results showed that it could be performed in less than one second with sufficient robustness against geometric distortions and noise, which satisfies the requirements for practical use.