| 摘要 |
<p>A specific frequency component signal is extracted from an input image signal (10) by a predetermined frequency component extraction unit (11), at least one of the phase and amplitude of the specific frequency component signal is controlled according to watermark information by a phase controller (12) and an amplitude controller (13), and an image signal embedded with watermark information is generated by superposing the specific frequency component signal on the input image signal by a watermark information superposing unit (16).</p> |
