| US 7,515,731 B2 | ||
| Digital watermark embedding apparatus and digital watermark detecting apparatus | ||
| Shinichiro Koto, Machida (Japan); Wataru Asano, Yokohama (Japan); and Tomoo Yamakage, Yokohama (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Aug. 28, 2003, as Appl. No. 10/649,830. | ||
| Claims priority of application No. 2002-255719 (JP), filed on Aug. 30, 2002. | ||
| Prior Publication US 2004/0117629 A1, Jun. 17, 2004 | ||
| Int. Cl. G06K 9/00 (2006.01) | ||
| U.S. Cl. 382—100 | 4 Claims |
| 1. A digital watermark embedding apparatus which generates an output image signal by embedding a digital watermark signal
in an input image signal, comprising:
a detector which detects a signal characteristic of at least one of the input image signal and the output image signal; and
a control device configured to control an embedding intensity of the digital watermark signal with respect to the input image
signal in accordance with the signal characteristic,
wherein the detector includes
a first detector which detects a signal intensity of the digital watermark signal which is extracted from the output image
signal; and
a second detector which detects an activity indicating complexity from at least one of the input image signal and the digital
watermark signal, and
the control device controls the embedding intensity of the digital watermark signal with respect to the input image signal
based directly on the detected signal intensity and the detected activity.
|