| 摘要 |
PURPOSE: A forensic marking method based on a hologram for tracking pyramid selling distribution and a system thereof are provided to prevent simultaneous extraction of multi bit information by separating a real image from a fake image, thereby effectively inserting a lot of information. CONSTITUTION: A hologram is generated by a forensic mark(10). The hologram is inserted into raw data(20). The hologram is extracted from data into which the forensic mark is inserted(30). The forensic mark is detected from the hologram(40). The hologram is inserted and extracted by a double conversion technique. |
