SCALE SEARCHING FOR WATERMARK DETECTION

摘要

The present invention relates to a method, device (12) and computer program product for enabling detection of additional data embedded in a media signal that may have been subjected to scaling. The invention also relates to an additional data detecting device (10) comprising such a device for enabling detection. An envelope discriminating unit (ED) provides a first extracted narrow band envelope signal sample (w e [n]) from an input media signal sample (y b [n]), and a variable scale down sampling unit (VSDS) down samples the narrow band envelope signal sample using a down sampling rate that is dependent on a scaling factor variable value (·) for providing at least one sample of a first additional data estimate (w n [k]) in order to allow the detection of additional data in said signal sample.