| 摘要 |
A watermark detector (100) detects a watermark in an information signal. The information signal is correlated with an expected watermark (Wi) for each of a plurality of relative positions of the information signal with respect to the watermark to derive a set of correlation results (64). The correlation results (64) are analysed to identify a cluster of correlation results which exceed a threshold value, the cluster representing a possible correlation peak. Where multiple clusters are identified, the most likely cluster is selected for further processing while other results are discarded. The cluster of results can identify a correlation peak which has become smeared due to lossy processing during distribution of the information signal.
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