| 摘要 |
Apparatuses, and methods for inserting user data into digital multimedia signals are provided in which user data is inserted into the digital multimedia signals in a substantially imperceptible fashion. In one embodiment of the invention, digital watermarking techniques are used to embed user data into the digital multimedia signal, such that user data is later helpful in indexing the digital multimedia signal. User data can be in any generic form such as text, audio or video signals. In another embodiment of the invention, user data is superimposed on the digital multimedia signal at a location which contains the least amount of information. In yet another embodiment of the invention, user data is inserted at a location chosen by the user. The color in which user data is superimposed can also be chosen by the user by using either a color palette or by pointing to an area in the digital image or video.
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