METHOD AND SYSTEM FOR AUTHENTICATING PRINTED DOCUMENTS

摘要

Method of providing an authenticated printed document including generating a message image by applying conversion parameters to text, the message image being defined by pixels and including converted text in a first color and a background in a second color; generating a first pixel array of the same pixel size as the image by selecting a sub-pixel configuration for each pixel of the first array; generating a second pixel array corresponding to the first array. The pixel of the image is in the second color, a first sub-pixel configuration for the second array is identical to the configuration selected for the first array, or where the pixel of the image is the first color, a second sub-pixel configuration generated for the second array is inverted relative to the configuration for the first array, such that the converted text is hidden in the second array; transferring the second array to the document; providing the first array on a transparent medium for superimposing on the second array on the document to reveal the converted text.

主权项

1. A method of providing a printed document that can be visually authenticated, comprising the steps of:
generating a message image by applying conversion parameters to a text, the message image being defined by pixels and the message image including a converted text in a first color and a background in a second color; generating a first pixel array of the same pixel size as the message image by selecting a predefined sub-pixel configuration for each pixel of the first pixel array; generating a second pixel array corresponding to the first pixel array, wherein where the pixel of the message image is in the second color, a first sub-pixel configuration generated for the second pixel array is identical to the predefined sub-pixel configuration selected for the first pixel array, or where the pixel of the message image is in the first color, a second sub-pixel configuration generated for the second pixel array is inverted relative to the predefined sub-pixel configuration selected for the first pixel array, such that the converted text is hidden in the second pixel array; transferring the second pixel array to the printed document; providing the first pixel array rendered on a transparent medium to a user for superimposing on the second pixel array located on the printed document to reveal the converted text to the user.