| 摘要 |
A method of embedding a pattern (110) as a watermark into a content segment (151). Prior to modifying the content segment an impulse response of a filter to be used for detecting the pattern is determined; the time reversed impulse response of the filter is inserted into the segment as the set of imperceptible features (121); wherein the filter is an infinite impulse response filter characterized by a semi white frequency spectrum and provides a pseudo random time domain response. Detection is characterized in that a filter is applied to the content segment the filter being an infinite impulse response filter characterized by a semi white frequency spectrum and providing a pseudo random time response the output of the filter is processed to obtain the pattern from which the payload can potentially be reconstructed. |
