FIELD: physics, alarm.
SUBSTANCE: invention is related to detection of "watermarks" in information signals. Watermark detector (100) detects watermark in information signal. Information signal is correlated with expected watermark (Wi) for each out of multiple relative positions of information signal relative to watermark, in order to produce set of correlation results (64). Correlation results (64) are analysed, in order to identify cluster of correlation results, which exceeds threshold value, moreover, it represents possible correlation peak. If multiple clusters are identified, the most probable cluster is selected for further treatment, while other results are dismissed. Cluster of results may identify correlation peak, which becomes spread due to processing with losses in the process of information signal distribution.
EFFECT: higher efficiency of watermark detection in information signal.
14 cl, 6 dwg
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