DIGITAL WATERMARK BURYING METHOD AND DEVICE, AND DIGITAL WATERMARK DETECTING METHOD AND DEVICE

摘要

A specific frequency extraction unit (11) extracts a specific frequency component signal from an input image signal (10), a phase controller (12) and amplitude controller (13) control at least one of the phase and amplitude of the specific frequency component signal in accordance with watermark information, and a watermark information superposition unit (16) superposes the specific frequency component signal on the input image signal to generate an image signal embedded with the watermark information.