HOLOGRAM FILM FOR COUNTERFEIT PREVENTION WITH WATERMARKS OF A PLURALITY OF IMAGES, A MANUFACTURING METHOD AND A WATERMARK IDENTIFYING METHOD FOR EASILY IDENTIFYING WHETHER TRUTH OR NOT OF A SECURITY PRODUCT HAVING A HOLOGRAM FILM BY USING A WATERMARK

摘要

PURPOSE: A hologram film for counterfeit prevention with watermarks of a plurality of images, a manufacturing method and a watermark identifying method are provided to block a copy of a watermark with enhancement of security for the watermark.;CONSTITUTION: A watermark(20) is formed on four corners in a hologram thin film(10). An image is impressed on the watermark. The image is displayed as a number for enhancing security. The image is hidden by a background pattern. A separate filter(30) is overlapped on the watermark. The hidden watermark is identified by controlling a relative location of the separate filter.;COPYRIGHT KIPO 2013