DIGITAL WATERMARK EMBEDDING SYSTEM, DIGITAL WATERMARK EMBEDDING DEVICE, DIGITAL WATERMARK SIGNAL GENERATION DEVICE, AND DIGITAL WATERMARK EMBEDDING PROGRAM

摘要

PROBLEM TO BE SOLVED: To increase a speed of switching a digital watermark.SOLUTION: In a digital watermark embedding device 100, a first conversion unit 140 inversely converts an image signal of an U component of an input image 201 into the image signal of the U component after the signal is converted to a first frequency signal including a plurality of frequency components corresponding to each bit of digital watermarks 301. In each bit of the digital watermark 301, a second conversion unit 150 inversely converts the image signal of a V component of the input image 201 to the image signal of V component after the image signal is converted to a second frequency signal in a case where it is assumed that a value of a bit is equal to 0. A generation unit 160 generates the image signal of V component corresponding to an actual value of the bit of the digital watermark 301 by using the image signal of V component. A synthesis unit 170 synthesizes an image synthesized by the image signal of U component acquired by the first conversion part 140, the image signal of V component generated by the generation unit 160, and the image signal of a Y component of the input image 201 to the input image 201.SELECTED DRAWING: Figure 1