| 摘要 |
The present invention relates to a method for embedding a watermark (w) in an image motion signal ( 55 ). The invention describes a method for embedding a watermark (w) in a motion image signal ( 55 ) in the optical domain in several steps. Initially, the watermark, i.e. the information for embedding, is represented by a sequence of watermark samples. During embedding sharpness changing means ( 10 ) are applied to change the sharpness in response to the watermark samples, and thereby embedding the watermark in the motion image signal ( 55 ) in a simple and efficient manner in the optical domain. The sharpness changing can be implemented by various ways, e.g. by displacing a lens ( 10 ) slightly. A particular embodiment exploits a variable focus lens having a liquid lens operated by electro-wetting. Further, the present invention relates to a corresponding apparatus for embedding the watermark.
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