WATERMARK DECODING

The method of deciding about whether a signal received contains a watermark or not is ‘detection’. But, identification is the actual process of decoding the unique watermark from a finite number of possible choices. The two kinds of errors could occur at the detection. The first one is detection of watermark in the received signal when it really does not exist. The second one is quite opposite to this. Herein, the watermark, which inherently exists in the received data, is not detected. Synchronization failure between watermark embedding and detection process could disable the entire communication process. This could result in attacks on the signal