Patent ID: 6757405
Filing Date: 2004-06-29
Classification: G06T,H04N

Abstract:
A digital watermark embedding device, comprising:an input section which inputs pixel value data of an image which is a target for embedding of watermark information; an embedded position selection section which determines one or more positions in a frequency domain into which the watermark information is to be embedded, without depending upon a frequency component value associated with the frequency domain; a frequency component value variation decision section which determines a variation of the frequency component value at each embedded position determined by the embedded position selection section; a pixel value variation calculation section which calculates a variation of a pixel value at each point in a pixel value domain of the image based on the one or more embedded positions in the frequency domain determined by the embedded position selection section and based on the variation of the frequency component value determined by the frequency component value variation decision section; a pixel value conversion section which embeds watermark information by changing corresponding pixel value data of the image in accordance with the variation of the pixel value at each point in the pixel value domain calculated by the pixel value variation calculation section; and an output section which outputs pixel value data of the image into which watermark information has been embedded.