Method for constructing a composite image incorporating a hidden authentication image

摘要

A method is provided for constructing a composite image having an authentication image formed therein. The authentication image is viewable using a decoder lens having one or more decoder lens frequencies. The method includes generating two gray-scale component images having tonal areas that are tonally balanced around at least one tonal value. At least one of the two gray-scale component images includes a representation of the authentication image. The method further includes determining a first pattern of the component image elements for the two gray-scale component images, the first pattern including a first element configuration and at least one element frequency that is equal to or a multiple of one of the decoder lens frequencies. The method includes extracting at least a portion of the content from the component image elements of the two gray-scale component images and constructing a composite image having a second pattern of composite image elements.

主权项

1. An automated method for constructing a composite image having an authentication image formed therein, the authentication image being viewable through a decoder lens having a plurality of lens elements defining one or more decoder lens frequencies, the method comprising:
generating two gray-scale component images having tonal areas that are tonally balanced around at least one tonal value, at least one of the two gray-scale component images including a representation of the authentication image; determining a first pattern of the component image elements for the two gray-scale component images, the first pattern including a first element configuration and at least one element frequency that is equal to or a multiple of one of the decoder lens frequencies, the component image elements for a corresponding gray-scale component image collectively carrying content of the corresponding gray-scale component image; extracting at least a portion of the content from the component image elements of the two gray-scale component images; and constructing a composite image having a second pattern of composite image elements, the second pattern having a second element configuration that corresponds to the first element configuration, the second pattern having the at least one element frequency that is equal to or a multiple of one of the decoder lens frequencies, the composite image elements including the content extracted from the component image elements obtained from the two gray-scale component images.