Patent ID: 7672475
Filing Date: 2010-03-02
Classification: G07D

Abstract:
1. A method for verifying a hologram, the method comprising the steps of: receiving at least two 2-dimensional images of the hologram, the 2-dimensional images being representative of images derived at respective different viewing angles; preparing a bitmap of each of the at least two 2-dimensional images of the hologram; computing difference values of corresponding pixels in each of the bitmaps of the at least two 2-dimensional images of the hologram; comparing difference values of a characteristic derived from the bitmaps of the at least two 2-dimensional images with a corresponding 2-dimensional reference characteristic to establish if the hologram is authentic; and outputting a signal indicative of the authenticity or otherwise of the hologram in response to comparing the difference values of the characteristic derived from the bitmaps of the at least two 2-dimensional images with the corresponding 2-dimensional reference characteristic.