DETECTING WATERMARKS Russian patent published in 2009 - IPC G06T1/00 H04N7/08 

FIELD: physics; signalling.

SUBSTANCE: invention relates to detection of watermarks in information signals. An information signal is proposed, which includes several watermarks (Wi), which together determine the data payload, such as information rights. Detector (100) detects presence (60-62) of each of the several watermarks in the information signal and provides for output (101-103), which can be used for installing (70, 75) payload, presented by watermarks. The degree of confidence in authenticity of the payload, presented by the watermarks, is calculated (110) using information (104-106) from detection stages (60-62). This provides for measurement of the quality of payload for any equipment, which depends on payload results, such as digital rights control system. Information on the form of the correlation peaks, obtained at detection stages 60-62, can be used for outputting the degree of confidence in authenticity of the payload.

EFFECT: more effective extraction of payload, transmitted by a watermark in an information signal.

12 cl, 6 dwg, 2 tbl, 1 ex