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3.0 Implementation of Watermark Encoders and Decoders The state of watermark encoders and decoders for audio, video and still images is quite advanced.
In many applications, it may be useful to insert a link in one media type to content of another media type within the multimedia data.
Each media signal may link to another one by providing a media signal identifier in the watermark message, such as an address, pointer, index, name of media title, etc.Most commonly, digital watermarking is applied to media such as images, audio signals, and video signals.5,862,260, 5,930,369, and.S.This scheme reduces the complexity of the second detector because it uses the orientation parameters extracted from a first media type to assist computation of the orientation in another media type.One example is a movie, which has an audio and video track.The data may be modified such that the embedded code is imperceptible or nearly imperceptible to the user, yet may be detected through an automated detection process.The watermarks may also be used to encode authentication information.One example is a media codec, like an mpeg decoder.The following sub-sections describe various scenarios for integrating watermarks in different media types from the perspective of the decoder.

These watermark systems may be used to implement the scenarios described above.
Examples of watermark systems used in copy control are: WO 00/04688, WO 00/04712, WO 00/04727, and WO 99/65240.
For example, attributes of an image may be extracted from the image and encoded into an audio track, and similarly, attributes of an audio track may be extracted and encoded in an image.
One way is to use a unified key that controls how a given message or set of messages are encoded and located within the respective media types.This method may be used in a variety of applications.The encoder and decoder implementations as well as related media codecs and applications may be implemented in C/C and are portable to many different computer systems.For example, a user could initiate playback by clicking trucchi per guadagnare soldi in pou on an image from the multimedia content.18, 1993 (now abandoned).Another form of control data is region data that indicates that a particular media signal may only be played when the region data of the media signal and the player match.In copy protection applications, the decoding system would need to find the watermarks in each of the media signals before enabling certain actions (e.g., playback, recording, copying, etc.).However, it may also be applied to other types of data, including documents (e.g., through line, word or character shifting software, multi-dimensional graphics models, and surface textures of objects.