Digital watermark-embedding apparatus, digital watermark-embedding method, and recording medium

A digital watermark-embedding apparatus operable to selectively embed a digital watermark into a target image subject to digital watermark embedment in an entered video signal, comprising:

• a parameter-calculating unit operable to calculate a parameter that shows image complexity;
• and
• a digital watermark-embedding unit operable to embed the digital watermark into the target image only when the parameter calculated by said parameter-calculating unit meets a certain condition that shows the image complexity.

A digital watermark-embedding apparatus operable to embed a digital watermark into a target image subject to digital watermark embedment in an entered video signal, comprising:

• an area-dividing unit operable to divide the target image into several local regions;
• and
• a digital watermark-embedding unit operable to embed the digital watermarks into the target image at the local regions divided by said area-dividing unit.

A digital watermark-embedding apparatus operable to embed a digital watermark into a target image subject to digital watermark embedment in an entered video signal, comprising:

• a digital watermark-embedding unit operable to embed the digital watermark into the target image in accordance with a difference between two selected images, the two selected images including one of the target image and a different image that is located at a position earlier, with respect to a time axis, than the target image.

A digital watermark-embedding method for embedding a digital watermark into a target image subject to digital watermark embedment in an entered video signal, comprising:

• embedding the digital watermark into the target image with reference to a different image located at a position earlier, with respect to a time axis, than the target image.

A digital watermark-embedding method for selectively embedding a digital watermark into a target image subject to digital watermark embedment in an entered video signal, comprising:

• calculating a parameter that shows image complexity;
• and
• embedding the digital watermark into the target image only when the calculated parameter meets a certain condition that shows the image complexity.

A digital watermark-embedding method for embedding a digital watermark into a target image subject to digital watermark embedment in an entered video signal, comprising:

• dividing the target image into several local regions;
• and
• embedding the digital watermarks into the target image at the divided local regions of the target image.

A digital watermark-embedding method for embedding a digital watermark into a target image subject to digital watermark embedment in an entered video signal, comprising:

• embedding the digital watermark into the target image in accordance with a difference between two selected images, the two selected images including one of the target image and a different image that is located at a position earlier, with respect to a time axis, than the target image.