System and Method for Digital Image Encoding

• US 20080044015A1
• Filed: 10/08/2007
• Published: 02/21/2008
• Est. Priority Date: 11/29/1995
• Status: Active Grant

• Current Assignee: Graphic Security Systems Corporation
• Original Assignee: Graphic Security Systems Corporation
• Inventors: Alasia, Alfred
• Granted Patent: US 7,466,876 B2
• Time in Patent Office: Days
• US Class Current: 380/51
• CPC Class Codes: H04N 1/448 Rendering the image unintelligible, e.g. scrambling
• CPC Class Codes: H04N 1/4486 using digital data encryption
• CPC Class Codes: H04N 1/4493 Subsequently rendering the image intelligible using a co-operating image, mask or the like
• CPC Class Codes: Y10S 283/901 Concealed data

Abstract

This invention relates generally to a method and apparatus, as implemented by a software program on a computer system, for producing digital encoded images. This method and system are capable of combining a source image with a latent image so that the latent image is viewable only through the use of a corresponding decoder. The digital processing allows different latent images to be encoded according to different parameters. Additionally, latent images may be encoded into single component colors of an original visible image, at various angles from each other.

Claims

1. An automated method for encoding and graphically embedding digital images into a source image, the method comprising:

providing a first digital output image;

rasterizing a source image into source image segments having a rasterization frequency equal to or a multiple of a decoder lens frequency; and

reforming the rasterized source image segments according to a pattern of the output image to form a revised source image having the output image graphically embedded therein, the out put image being viewable by orienting a decoder with the decoder lens frequency over a printed version of the revised source image.

2. An automated method according to claim 1 wherein the action of providing a first digital output image comprises:

providing a first digital input image;

dividing the first digital input image into a number of elemental image segments each having an input segment length dimension and an input width dimension, the number of elemental image segments being established so that the number of image segments per inch is equal to or a multiple of the decoder lens frequency; and

assembling the elemental image segments to form the first digital output image.

3. An automated method according to claim 2 further comprising:

resizing the elemental image segments so that each image segment has an output segment length dimension equal to the input segment length dimension and a common width dimension that is a function of the input segment width dimension and a scrambling factor, the elemental image segment being resized about a lengthwise segment centerline.

4. A method according to claim 3 wherein a ratio of the output segment width dimension to the input segment width dimension is proportional to the scrambling factor.

5. A method according to claim 3 wherein the scrambling factor is greater than or equal to 1.0.

6. A method according to claim 3 wherein the scrambling factor is an input parameter specified by a user of the automated method.

7. A method according to claim 1 further comprising:

printing the revised source image with sufficient resolution so that the input image may be discerned by viewing the revised source image through a lenticular lens having the decoder lens frequency.

8. A method according to claim 1 wherein the action of reforming the rasterized source image segments includes altering line thickness for at least a portion of the rasterized source image segments in areas corresponding to content in the output image pattern.

9. A method according to claim 1 wherein the action of reforming the rasterized source image segments includes shifting line position along a portion of at least some of the rasterized source image segments in areas corresponding to content in the output image pattern.

10. A method according to claim 1 further comprising:

flipping each elemental image segment 180 degrees about its lengthwise centerline.

11. A computer-readable medium having software code stored thereon, the software code being configured to cause a computer to execute a method for encoding an image and graphically embedding the image into a source image, the method comprising:

rasterizing a source image into source image segments having a rasterization frequency equal to or a multiple of a decoder lens frequency; and

reforming the rasterized source image segments according to a pattern of an output image to form a revised source image having the output image graphically embedded therein, the out put image being viewable by orienting a decoder with the decoder lens frequency over a printed version of the revised source image.

12. A computer-readable medium according to claim 11 wherein the method further comprises:

receiving a first digital input image;

dividing the first digital input image into a number of elemental image segments each having an input segment length dimension and an input width dimension, the number of elemental image segments being established so that the number of image segments per inch is equal to or a multiple of the decoder lens frequency; and

assembling the elemental image segments to form the output image.

13. A computer-readable medium according to claim 12 wherein the method further comprises:

resizing the elemental image segments so that each image segment has an output segment length dimension equal to the input segment length dimension and a common width dimension that is a function of the input segment width dimension and a scrambling factor, the elemental image segment being resized about a lengthwise segment centerline.

14. A computer-readable medium according to claim 13 wherein a ratio of the output segment width dimension to the input segment width dimension is proportional to the scrambling factor.

15. A computer-readable medium according to claim 13 wherein the scrambling factor is greater than or equal to 1.0.

16. A computer-readable medium according to claim 13 wherein the scrambling factor is an input parameter specified by a user of the automated method.

17. A computer-readable medium according to claim 11 wherein the method further comprises:

printing the revised source image with sufficient resolution so that the input image may be discerned by viewing the revised source image through a lenticular lens having the decoder lens frequency.

18. A computer-readable medium according to claim 11 wherein the action of reforming the rasterized source image segments includes altering line thickness for at least a portion of the rasterized source image segments in areas corresponding to content in the output image pattern.

19. A computer-readable medium according to claim 11 wherein the action of reforming the rasterized source image segments includes shifting line position along a portion of at least some of the rasterized source image segments in areas corresponding to content in the output image pattern.

20. A computer-readable medium according to claim 11 wherein the method further comprises:

flipping each elemental image segment 180 degrees about its lengthwise centerline.