CA2071795C - Latent images comprising phase shifted micro printing - Google Patents
Latent images comprising phase shifted micro printingInfo
- Publication number
- CA2071795C CA2071795C CA002071795A CA2071795A CA2071795C CA 2071795 C CA2071795 C CA 2071795C CA 002071795 A CA002071795 A CA 002071795A CA 2071795 A CA2071795 A CA 2071795A CA 2071795 C CA2071795 C CA 2071795C
- Authority
- CA
- Canada
- Prior art keywords
- characters
- viewed
- array
- security device
- alphanumeric characters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/29—Securities; Bank notes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S283/00—Printed matter
- Y10S283/901—Concealed data
Abstract
A security device comprising a substrate having applied thereto an array of characters, the characters being of a sufficiently small size as to appear uniform when ordinarily viewed but individually identifiable when viewed with the aid of appropriate magnification means, whereby group(s) of the characters are phase-shifted relative to the others in such a manner as to collectively define an image, the image being relatively indiscernible when the device is ordinarily viewed but discernible when viewed with the aid of a finding screen.
Description
LATE~T IMAGES COMP~RISING PHASE SHIFTED
MICRO PRI~TING
FIELD OF THE INVENTION
The invention relates generally to the field of security printing and, more particularly, to a computer-generated printed security device comprising microscopic characters, group(s) of which are phase shifted relative to others so as to form 2 latent image which is macroscopically viewable with the aid of a finding screen.
BACKGROUND
The printing of latent images per se, for purposes of security or authentication, is known. For example, Canadian Patent No. 1,172,282 to Trevor Merry provides a security device comprising overlying line deflection patterns which produce different macroscopically viewable images when overlain at different positions by a~ finding screen . The latent image disclosed by the said Canadian patent is comprised of parallel lines, portions of which are deflected a predetermined distance in the area of the latent imzge to define the same. The lines are, of course, readily visible and do not themselves provide any additional security feature zp2rt from the latent image. Thus, in order to increase the level of security provided by such a security device it was previously necessary to combine a separate security feature with the device, thereby adding printing or embossing steps to the overall p~ocess for produci~g the desired security document.
SlJl`rMARY OF T~E INVENTION
In accordance with the invention there is provided a Security device, and method for producing the same, which itself provides two distinct security features, one at a microscopic level and the other at a macroscopic level. The security device comprises a substrate having applied thereto an array of characters. The characters are of a sufficiently small size as to appear uniform when ordinarily viewed but individually identifiable when viewed with the aid of appropriate magnification means. Group(s) of said characters are phase-shifted relative to the others in such a manner as to collectively define a latent image, the image being relatively indiscernible when the device is ordinarily viewed but discernible when viewed with the aid of a finding screen.
Preferably the array of characters comprises a plurality of lines of alphanumeric characters. The characters preferably occupy an area of less than .2 square millimetres and have a density in the range of 1-3 character lines per millimeter.
Use of a dark b2ckground and light characters may be preferred.
Preferably the application of the array of characters includes the use of a computer to generate the array.
SUMMARY O~ T~ DRAWINGS
The invention is described below with reference to the following drawings:
Figure 1 is an enlarged illustration of a micro character array in accordance with the invention (The individual characters of the repeated mess2se "Canadian Bank Note ~icroplex"
actually occupying a space of about 0.18 mm square).
Figure 2 is an illustration of another example of a ~icro character array in accordance with the invention (again, the individual characters actually occupying a space of about 0.18 mm square).
Figure 3 is an illustration of the arrays of Figures S 1 and 2 interlaced such that the two macroscopic images defined thereby occupy alternating lines ofthe characters.
Figure 4 is an illustration of the positioning of the macroscopic image "CBN" within a character array. (This figure has been enlarged and an outline of the macroscopic image has been superimposed on the character array in order to more clearly illustrate the invention).
Figure 5 illustrates an alternate macroscopic image "MRP" in similar manner to that of Figure 4.
Figure 6 is an enlarged illustration of a micro character array in accordance with another embodiment of the invention, whereby a dark background surround light characters.
Figure 7 is an enlarged illustration of a micro character array in accordance with another embodiment of the invention, whereby the characters and the backgrounds thereof alternate between white and blacX, respectively, for each successive line of characters.
Figure a is a flow chart diagram of the steps which are performed by a computer to generate an array of micro characters, groups of which are phase shifted relative to the others to collectively form a macroscopic image.
DETAII.ED DESCRIPTIO~ OF T~IE I~'VENTION
The invention is a security device comprising a pattern of microscopiC characters, group(s) of which are phase-shifted relative to the others to collectively define a latent image which is macroscopically viewable with the aid of a findinq screen such as a lenticular screen (described below). Figures 1 and 2 show examples of security devices in accordance with the invention; for purposes of illustration the printing of those figures has been substantially enlarged so that the microscopic characters ma~ be readily viewed by the reader. However, in actuality the individual characters comprising the repeated message "CANADIAN BANK NOTE MICROPLEX" occupy a space of only about 0.18 mm square. The characters (which, alternatively, may make up any word, phrase or symbol) are spaced in lines or columns about 0.18 m~ apart which results in a character density of about 2.75 character lines per millimeter. Generally, the characters preferably occupy an area of less than .2 mm square 1~ (i.e. 2 mm x .2 mm) and have a density in the range of 1-3 character lines per millimeter. Thus, the characters are not readily viewable and, at a macroscopic level, appear to be uniform non-distinct lines or other print elements. However, the individual characters are viewable with the aid of a microscope 2~ or suitable magnifying lens.
As illustrated by the drawings the micro characters (i.e. in the case of Figures 1 through 7, the letters co~prising the character string "CANADIA.~ BANK NOTE MICROPLEX" are printed to form an array of rows (i.e. lines) and columns.
Macroscopically, the character array appears generally uniform, particularly in the example shown by Figures 6 and 7 in which light characters appear within a dark background, but microscopically the alphanumeric characters are individually identifiable and able to convey meaningful information. Portions of the lines and columns comprising the characters are phase-shifted to collectively form larger characters or sy~bols, for example the letters "CBN" or "MRP" most clearly illustrated by Figures 4 and 5 respectively which are discernable only when the array is viewed through a finding screen. As described below, the pattern of the micro characters, including the phase-shifting, is most conveniently generated by a computer, as is the re~uired pattern for the finding screen.
The charzcters (or groups of characters) are shifted above or below the centerline of the character str~ng by a distance of about one half the character height (i.e. about 0.09 mm). This phase shifting of the individual pre-selected characters is pre-arranged to, collectively, define a message comprising a word or symbol at a macroscopic level. If desired, two sets of character strings may be independently phase-shifted to macroscopically define two distinct messages as shown by Figure 3 of the drawings. The shifting of the characters is gradual, retaining a continuum of legible information across the boundary between the background and the macroscopically viewable image. By this means, the macroscopic image is not perceived without the assistance of the viewing screen, while at the macroscopic level, integrity of the individual characters and words is malntained.
Figure 8 provides a flow chart of a sequence of steps which are performed by a computer to generate the character arrays of Figures 1 through 7. of course, many program instruction sets might be developed on the basis of the flow-207179~
chart of Figure 8 depending upon the selected computer and output device and the specific characters and messages to be produced thereby, which are not specific to the subject matter claimed herein.
Computer-generated imaging is well known in the security printing industry and does not, per se, form any aspect of the present invention. Such imaging method provides 2 convenient and practical means of implementing the invention by reason of the degree of precision and control provided thereby.
The preferred methods of printing the character array are intaglio and offset lithography according to the conventional and well-known procedures in the industry. Embossing printing methods may also be appropriate where the security device is required for, for example, aluminized foil lottery tickets or where plastic laminates are used to protect identification documents.
The latent image within the printed character array, according to the foregoing, is viewable by overlaying the array with a lenticular findin~ screen comprising a set of convex plano-cylindrical lenses having the same line (or column) frequency as the character strings. When the lenses are aligned parallel to the character strings, the latent image is viewed at a slightly different angle than the array due to refraction. To construct the line pattern of the plano-cyIindrical lenses it is convenient to generate the same by means og a computer such that a set of computer generated lines having the same freouency as the character strings can be produced on photographic film. The lines are then etched through a photo sensitive resist into a ~0 i~7q-~
~uitable substrate such as copper using a solution of f~rr i c chloride. Each line is reproduced as a concave depression in the copper with a maximum depth of O.lS mm. After polishing the copper mould can be used to produce screens by heating a transparent plastic material such as PLEXIGLASS (trade-mark) under pressure against the mould. The plastic flows into the depressions forming a set of convex plano-cylindrical lenses raised above a base about lmm thic~. It will be appreciated that other lens arrays having optical characteristics matched to specific character line frequencies can be readily generated by this means.
MICRO PRI~TING
FIELD OF THE INVENTION
The invention relates generally to the field of security printing and, more particularly, to a computer-generated printed security device comprising microscopic characters, group(s) of which are phase shifted relative to others so as to form 2 latent image which is macroscopically viewable with the aid of a finding screen.
BACKGROUND
The printing of latent images per se, for purposes of security or authentication, is known. For example, Canadian Patent No. 1,172,282 to Trevor Merry provides a security device comprising overlying line deflection patterns which produce different macroscopically viewable images when overlain at different positions by a~ finding screen . The latent image disclosed by the said Canadian patent is comprised of parallel lines, portions of which are deflected a predetermined distance in the area of the latent imzge to define the same. The lines are, of course, readily visible and do not themselves provide any additional security feature zp2rt from the latent image. Thus, in order to increase the level of security provided by such a security device it was previously necessary to combine a separate security feature with the device, thereby adding printing or embossing steps to the overall p~ocess for produci~g the desired security document.
SlJl`rMARY OF T~E INVENTION
In accordance with the invention there is provided a Security device, and method for producing the same, which itself provides two distinct security features, one at a microscopic level and the other at a macroscopic level. The security device comprises a substrate having applied thereto an array of characters. The characters are of a sufficiently small size as to appear uniform when ordinarily viewed but individually identifiable when viewed with the aid of appropriate magnification means. Group(s) of said characters are phase-shifted relative to the others in such a manner as to collectively define a latent image, the image being relatively indiscernible when the device is ordinarily viewed but discernible when viewed with the aid of a finding screen.
Preferably the array of characters comprises a plurality of lines of alphanumeric characters. The characters preferably occupy an area of less than .2 square millimetres and have a density in the range of 1-3 character lines per millimeter.
Use of a dark b2ckground and light characters may be preferred.
Preferably the application of the array of characters includes the use of a computer to generate the array.
SUMMARY O~ T~ DRAWINGS
The invention is described below with reference to the following drawings:
Figure 1 is an enlarged illustration of a micro character array in accordance with the invention (The individual characters of the repeated mess2se "Canadian Bank Note ~icroplex"
actually occupying a space of about 0.18 mm square).
Figure 2 is an illustration of another example of a ~icro character array in accordance with the invention (again, the individual characters actually occupying a space of about 0.18 mm square).
Figure 3 is an illustration of the arrays of Figures S 1 and 2 interlaced such that the two macroscopic images defined thereby occupy alternating lines ofthe characters.
Figure 4 is an illustration of the positioning of the macroscopic image "CBN" within a character array. (This figure has been enlarged and an outline of the macroscopic image has been superimposed on the character array in order to more clearly illustrate the invention).
Figure 5 illustrates an alternate macroscopic image "MRP" in similar manner to that of Figure 4.
Figure 6 is an enlarged illustration of a micro character array in accordance with another embodiment of the invention, whereby a dark background surround light characters.
Figure 7 is an enlarged illustration of a micro character array in accordance with another embodiment of the invention, whereby the characters and the backgrounds thereof alternate between white and blacX, respectively, for each successive line of characters.
Figure a is a flow chart diagram of the steps which are performed by a computer to generate an array of micro characters, groups of which are phase shifted relative to the others to collectively form a macroscopic image.
DETAII.ED DESCRIPTIO~ OF T~IE I~'VENTION
The invention is a security device comprising a pattern of microscopiC characters, group(s) of which are phase-shifted relative to the others to collectively define a latent image which is macroscopically viewable with the aid of a findinq screen such as a lenticular screen (described below). Figures 1 and 2 show examples of security devices in accordance with the invention; for purposes of illustration the printing of those figures has been substantially enlarged so that the microscopic characters ma~ be readily viewed by the reader. However, in actuality the individual characters comprising the repeated message "CANADIAN BANK NOTE MICROPLEX" occupy a space of only about 0.18 mm square. The characters (which, alternatively, may make up any word, phrase or symbol) are spaced in lines or columns about 0.18 m~ apart which results in a character density of about 2.75 character lines per millimeter. Generally, the characters preferably occupy an area of less than .2 mm square 1~ (i.e. 2 mm x .2 mm) and have a density in the range of 1-3 character lines per millimeter. Thus, the characters are not readily viewable and, at a macroscopic level, appear to be uniform non-distinct lines or other print elements. However, the individual characters are viewable with the aid of a microscope 2~ or suitable magnifying lens.
As illustrated by the drawings the micro characters (i.e. in the case of Figures 1 through 7, the letters co~prising the character string "CANADIA.~ BANK NOTE MICROPLEX" are printed to form an array of rows (i.e. lines) and columns.
Macroscopically, the character array appears generally uniform, particularly in the example shown by Figures 6 and 7 in which light characters appear within a dark background, but microscopically the alphanumeric characters are individually identifiable and able to convey meaningful information. Portions of the lines and columns comprising the characters are phase-shifted to collectively form larger characters or sy~bols, for example the letters "CBN" or "MRP" most clearly illustrated by Figures 4 and 5 respectively which are discernable only when the array is viewed through a finding screen. As described below, the pattern of the micro characters, including the phase-shifting, is most conveniently generated by a computer, as is the re~uired pattern for the finding screen.
The charzcters (or groups of characters) are shifted above or below the centerline of the character str~ng by a distance of about one half the character height (i.e. about 0.09 mm). This phase shifting of the individual pre-selected characters is pre-arranged to, collectively, define a message comprising a word or symbol at a macroscopic level. If desired, two sets of character strings may be independently phase-shifted to macroscopically define two distinct messages as shown by Figure 3 of the drawings. The shifting of the characters is gradual, retaining a continuum of legible information across the boundary between the background and the macroscopically viewable image. By this means, the macroscopic image is not perceived without the assistance of the viewing screen, while at the macroscopic level, integrity of the individual characters and words is malntained.
Figure 8 provides a flow chart of a sequence of steps which are performed by a computer to generate the character arrays of Figures 1 through 7. of course, many program instruction sets might be developed on the basis of the flow-207179~
chart of Figure 8 depending upon the selected computer and output device and the specific characters and messages to be produced thereby, which are not specific to the subject matter claimed herein.
Computer-generated imaging is well known in the security printing industry and does not, per se, form any aspect of the present invention. Such imaging method provides 2 convenient and practical means of implementing the invention by reason of the degree of precision and control provided thereby.
The preferred methods of printing the character array are intaglio and offset lithography according to the conventional and well-known procedures in the industry. Embossing printing methods may also be appropriate where the security device is required for, for example, aluminized foil lottery tickets or where plastic laminates are used to protect identification documents.
The latent image within the printed character array, according to the foregoing, is viewable by overlaying the array with a lenticular findin~ screen comprising a set of convex plano-cylindrical lenses having the same line (or column) frequency as the character strings. When the lenses are aligned parallel to the character strings, the latent image is viewed at a slightly different angle than the array due to refraction. To construct the line pattern of the plano-cyIindrical lenses it is convenient to generate the same by means og a computer such that a set of computer generated lines having the same freouency as the character strings can be produced on photographic film. The lines are then etched through a photo sensitive resist into a ~0 i~7q-~
~uitable substrate such as copper using a solution of f~rr i c chloride. Each line is reproduced as a concave depression in the copper with a maximum depth of O.lS mm. After polishing the copper mould can be used to produce screens by heating a transparent plastic material such as PLEXIGLASS (trade-mark) under pressure against the mould. The plastic flows into the depressions forming a set of convex plano-cylindrical lenses raised above a base about lmm thic~. It will be appreciated that other lens arrays having optical characteristics matched to specific character line frequencies can be readily generated by this means.
Claims (13)
1. A security device comprising both microscopic and macroscopic hidden images, said device comprising a substrate having applied thereto an array of alphanumeric characters, said characters being of a sufficiently small size as to appear uniform when ordinarily viewed but collectively forming a microscopic image capable of conveying meaningful information when viewed with the aid of appropriate magnification means, whereby group(s) of said characters are phase-shifted relative to other said characters in such a manner as to collectively define a macroscopic image, said macroscopic image being relatively indiscernible when said device is ordinarily viewed but discernible when viewed with the aid of a finding screen.
2. A security device according to claim 1 wherein said array of alphanumeric characters comprises a plurality of lines of alphanumeric characters.
3. A security device according to claim 2 wherein said microscopic image comprises one or more words.
4. A security device according to claim 2 wherein each of said alphanumeric characters occupies an area of less than .2 millimetres square.
5. A security device according to claim 4 wherein the density of said alphanumeric characters is in the range of 1-3 character lines per millimetre.
6. A security device according to claim 5 wherein a dark background surrounds light characters.
7. A method of making a security device comprising both macroscopic and microscopic hidden images, comprising the steps of applying to a substrate an array of alphanumeric characters, said characters being of a sufficiently small size as to appear uniform when ordinarily viewed but collectively forming a microscopic image capable of conveying meaningful information when viewed with the aid of appropriate magnification means, and positioning group(s) of said characters in phase-shifted relation relative to other said characters so as to collectively form [an] a macroscopic image, said macroscopic image being relatively indiscernible when said device is ordinarily viewed but discernible when viewed with the aid of a finding screen.
8. A method according to claim 7 whereby said application of said array of alphanumeric characters includes the use of a computer to generate said array.
9. A method according to claim 8 wherein said array of alphanumeric characters comprises a plurality of lines of characters.
10. A method according to claim 9 wherein said microscopic image comprises one or more words.
11. A method according to claim 9 whereby each of said alphanumeric characters occupies an area of less than .2 millimetres square.
12. A method according to claim 11 whereby the density of said alphanumeric characters is in the range of 1-3 character lines per millimetre.
13. A method according to claim 12 whereby a dark background surrounds light characters.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/720,392 US5178418A (en) | 1991-06-25 | 1991-06-25 | Latent images comprising phase shifted micro printing |
| US07/720,392 | 1991-06-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2071795A1 CA2071795A1 (en) | 1992-12-26 |
| CA2071795C true CA2071795C (en) | 1996-08-06 |
Family
ID=24893847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002071795A Expired - Fee Related CA2071795C (en) | 1991-06-25 | 1992-06-22 | Latent images comprising phase shifted micro printing |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5178418A (en) |
| EP (1) | EP0520363B1 (en) |
| AT (1) | ATE149022T1 (en) |
| CA (1) | CA2071795C (en) |
| DE (1) | DE69217512T2 (en) |
Families Citing this family (61)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5291243A (en) * | 1993-02-05 | 1994-03-01 | Xerox Corporation | System for electronically printing plural-color tamper-resistant documents |
| WO1995004665A1 (en) * | 1993-08-10 | 1995-02-16 | Hardy Business Forms Limited | Embedded printed data - method and apparatus |
| US5445418A (en) * | 1993-09-08 | 1995-08-29 | Moore Business Forms, Inc. | Security paper/document construction |
| US5436974A (en) * | 1993-10-12 | 1995-07-25 | Innovator Corporation | Method of encoding confidentiality markings |
| US5748763A (en) * | 1993-11-18 | 1998-05-05 | Digimarc Corporation | Image steganography system featuring perceptually adaptive and globally scalable signal embedding |
| US6449377B1 (en) | 1995-05-08 | 2002-09-10 | Digimarc Corporation | Methods and systems for watermark processing of line art images |
| US7286684B2 (en) * | 1994-03-17 | 2007-10-23 | Digimarc Corporation | Secure document design carrying auxiliary machine readable information |
| US5661284A (en) * | 1995-03-13 | 1997-08-26 | Albert J. Freeman | Commercial transaction system |
| US7555139B2 (en) * | 1995-05-08 | 2009-06-30 | Digimarc Corporation | Secure documents with hidden signals, and related methods and systems |
| US7114750B1 (en) * | 1995-11-29 | 2006-10-03 | Graphic Security Systems Corporation | Self-authenticating documents |
| US6859534B1 (en) * | 1995-11-29 | 2005-02-22 | Alfred Alasia | Digital anti-counterfeiting software method and apparatus |
| GB2318324B (en) * | 1996-10-19 | 2001-05-16 | Xerox Corp | Secure printing system |
| US5924737A (en) * | 1996-12-12 | 1999-07-20 | Young America Corporation | Postcard check |
| US6104812A (en) * | 1998-01-12 | 2000-08-15 | Juratrade, Limited | Anti-counterfeiting method and apparatus using digital screening |
| GB2375254B (en) * | 1998-04-16 | 2002-12-24 | Digimarc Corp | Marking documents with machine-readable data and watermarks |
| US7422244B1 (en) * | 1998-06-03 | 2008-09-09 | Digimarc Corporation | Identification document with document specific reduced scale printing |
| US6325420B1 (en) | 1998-08-17 | 2001-12-04 | Inspectron Corporation | Method for embedding non-intrusive encoded data in printed matter and system for reading same |
| US6301363B1 (en) | 1998-10-26 | 2001-10-09 | The Standard Register Company | Security document including subtle image and system and method for viewing the same |
| US20030137145A1 (en) * | 1999-01-08 | 2003-07-24 | John Fell | Authentication means |
| US6050607A (en) | 1999-03-26 | 2000-04-18 | The Standard Register Company | Security image element tiling scheme |
| US6139066A (en) * | 1999-03-26 | 2000-10-31 | The Standard Register Company | Optically decodable security document |
| DE19963849A1 (en) † | 1999-12-30 | 2001-07-12 | Giesecke & Devrient Gmbh | Data carrier with printed security element |
| US7046804B1 (en) | 2000-04-19 | 2006-05-16 | Canadian Bank Note Company, Ltd | System for producing a printable security device image and detecting latent source image(s) therefrom |
| DE10044403A1 (en) * | 2000-09-08 | 2002-03-21 | Giesecke & Devrient Gmbh | Data carrier with intaglio printing and method for converting image motifs into line structures as well as in an intaglio printing plate |
| US6870841B1 (en) | 2000-09-18 | 2005-03-22 | At&T Corp. | Controlled transmission across packet network |
| JP4833425B2 (en) * | 2001-03-29 | 2011-12-07 | 共同印刷株式会社 | How to create a forgery prevention pattern |
| GB0202962D0 (en) * | 2002-02-08 | 2002-03-27 | Ascent Systems Software Ltd | Security printing |
| DE10208393A1 (en) * | 2002-02-27 | 2003-09-04 | Giesecke & Devrient Gmbh | Security document and security element for a security document |
| CA2405249A1 (en) | 2002-09-24 | 2004-03-24 | Canadian Bank Note Company, Limited | Printed security device and method |
| AU2002951963A0 (en) * | 2002-10-09 | 2002-10-24 | Commonwealth Scientific And Industrial Research Organisation | Method of combining images |
| KR20050103977A (en) * | 2003-03-06 | 2005-11-01 | 디지맥 코포레이션 | Camera and digital watermarking systems and methods |
| US6985607B2 (en) | 2003-03-27 | 2006-01-10 | Graphic Security Systems Corporation | System and method for authenticating objects |
| AU2003902810A0 (en) * | 2003-06-04 | 2003-06-26 | Commonwealth Scientific And Industrial Research Organisation | Method of encoding a latent image |
| DE10328760B4 (en) * | 2003-06-25 | 2007-05-24 | Ovd Kinegram Ag | Optical security element |
| DE10328759B4 (en) * | 2003-06-25 | 2006-11-30 | Ovd Kinegram Ag | Optical security element and system for visualizing hidden information |
| WO2005006025A2 (en) * | 2003-06-30 | 2005-01-20 | Graphic Security Systems Corporation | Illuminated decoder |
| AU2003903501A0 (en) * | 2003-07-07 | 2003-07-24 | Commonwealth Scientific And Industrial Research Organisation | A method of forming a reflective authentication device |
| AU2003903502A0 (en) * | 2003-07-07 | 2003-07-24 | Commonwealth Scientific And Industrial Research Organisation | A method of forming a diffractive authentication device |
| WO2005002880A1 (en) * | 2003-07-07 | 2005-01-13 | Commonwealth Scientific And Industrial Research Organisation | Method of encoding a latent image |
| US6980654B2 (en) * | 2003-09-05 | 2005-12-27 | Graphic Security Systems Corporation | System and method for authenticating an article |
| US7421581B2 (en) * | 2003-09-30 | 2008-09-02 | Graphic Security Systems Corporation | Method and system for controlling encoded image production |
| GB2411862B (en) * | 2004-03-11 | 2007-05-30 | Security Print Solutions Ltd | A printed material having security information printed thereon and a method of printing security information |
| US7551752B2 (en) * | 2004-04-26 | 2009-06-23 | Graphic Security Systems Corporation | Systems and methods for authenticating objects using multiple-level image encoding and decoding |
| US7512249B2 (en) * | 2004-04-26 | 2009-03-31 | Graphic Security Systems Corporation | System and method for decoding digital encoded images |
| US7630513B2 (en) | 2004-04-26 | 2009-12-08 | Graphic Security Systems Corporation | System and method for network-based object authentication |
| US7729509B2 (en) * | 2004-06-18 | 2010-06-01 | Graphic Security Systems Corporation | Illuminated lens device for use in object authentication |
| EP1634722B8 (en) * | 2004-09-09 | 2009-10-07 | Alcan Technology & Management Ltd. | Article with forgery-proof printing |
| PT1652687E (en) * | 2004-10-29 | 2009-04-08 | Fab Nac Moneda Y Timbre Es | Security element |
| US20060197337A1 (en) * | 2005-03-04 | 2006-09-07 | Canadian Bank Note Company, Limited | Identification document with lenticular watermark |
| GB2429187B (en) * | 2005-08-15 | 2007-08-08 | Rue De Int Ltd | Security devices for security substrates |
| US7860268B2 (en) | 2006-12-13 | 2010-12-28 | Graphic Security Systems Corporation | Object authentication using encoded images digitally stored on the object |
| US20090315319A1 (en) * | 2007-07-17 | 2009-12-24 | Jimmy Kendrick | Security documents and methods of deterring counterfeiting |
| US20090021000A1 (en) * | 2007-07-17 | 2009-01-22 | Mccartney Larry G | Security documents and methods of deterring counterfeiting |
| US20090020999A1 (en) * | 2007-07-17 | 2009-01-22 | Jimmy Kendrick | Security documents and methods of deterring counterfeiting |
| JP5699313B2 (en) * | 2010-08-09 | 2015-04-08 | 大日本印刷株式会社 | Luminescent medium |
| SG189354A1 (en) | 2010-10-11 | 2013-05-31 | Graphic Security Systems Corp | Method for constructing a composite image incorporating a hidden authentication image |
| TWI574555B (en) | 2011-02-22 | 2017-03-11 | 太格文 Ｉｉ有限責任公司 | Picture coding method and picture coding apparatus |
| CN107094258B (en) | 2011-02-22 | 2020-02-14 | 太阳专利托管公司 | Image decoding method and image decoding device |
| KR101769408B1 (en) * | 2011-03-29 | 2017-08-18 | 쥬라 트레이드, 리미티드 | Method and apparatus for generating and authenticating security documents |
| CN103703774B (en) | 2011-07-19 | 2017-06-20 | 太格文-Ii有限责任公司 | Filtering method, coding/decoding method and coding method |
| JP6334879B2 (en) * | 2013-10-01 | 2018-05-30 | 有限会社 みさとみらい２１ | Notebook and manufacturing method thereof |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1066462B (en) * | 1959-10-01 | R. Oldenbourg, Graphische Betriebe G.m.b.H., München | Process to increase the protection against counterfeiting in single or multi-colored guilloche lines | |
| US3675948A (en) * | 1969-09-10 | 1972-07-11 | American Bank Note Co | Printing method and article for hiding halftone images |
| CA1066109A (en) * | 1975-11-12 | 1979-11-13 | Canadian Bank Note Company | Photographic simulation of density differences as changes of line direction |
| US4168088A (en) * | 1977-12-15 | 1979-09-18 | Burroughs Corporation | Protected document and method of making the same |
| CA1172282A (en) * | 1980-09-22 | 1984-08-07 | Trevor Merry | Multiple superimposed latent images |
| US4582346A (en) * | 1984-05-08 | 1986-04-15 | Moore Business Forms, Inc. | Document security system |
| FI80405C (en) * | 1988-03-24 | 1990-06-11 | Suomen Pankin Setelipaino | Printed article secured with warning figure and method for its cutting |
| US4998010A (en) * | 1988-04-08 | 1991-03-05 | United Parcel Service Of America, Inc. | Polygonal information encoding article, process and system |
| US4891666A (en) * | 1988-11-28 | 1990-01-02 | Quebecor Publitech Inc. | Copy indicator for a document |
-
1991
- 1991-06-25 US US07/720,392 patent/US5178418A/en not_active Expired - Lifetime
-
1992
- 1992-06-22 CA CA002071795A patent/CA2071795C/en not_active Expired - Fee Related
- 1992-06-23 AT AT92110541T patent/ATE149022T1/en not_active IP Right Cessation
- 1992-06-23 EP EP92110541A patent/EP0520363B1/en not_active Expired - Lifetime
- 1992-06-23 DE DE69217512T patent/DE69217512T2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE69217512T2 (en) | 1997-06-05 |
| US5178418A (en) | 1993-01-12 |
| EP0520363B1 (en) | 1997-02-19 |
| CA2071795A1 (en) | 1992-12-26 |
| DE69217512D1 (en) | 1997-03-27 |
| EP0520363A1 (en) | 1992-12-30 |
| ATE149022T1 (en) | 1997-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2071795C (en) | Latent images comprising phase shifted micro printing | |
| US7466876B2 (en) | System and method for digital image encoding | |
| EP0698256B2 (en) | Security device | |
| US7710551B2 (en) | Model-based synthesis of band moire images for authentication purposes | |
| RU2215658C2 (en) | Protective indicator carrying perforation pattern | |
| US7194105B2 (en) | Authentication of documents and articles by moiré patterns | |
| US20180311990A1 (en) | Synthesis of superpostion shape images by light interacting with superposed layers of lenslet gratings | |
| JP2007538267A (en) | Method for forming a reflective device | |
| ZA200600010B (en) | A method of forming a diffractive device | |
| UA89969C2 (en) | security device and document, film and label comprising thereof | |
| JP2010072382A (en) | Diffraction grating recording medium | |
| JP5332441B2 (en) | Diffraction grating recording medium | |
| EP1023187B1 (en) | Micrographic device | |
| CA2161082A1 (en) | Holograms | |
| US20220326540A1 (en) | Micro-Optic Device | |
| JP2023107332A (en) | Photoluminescent moving-image pattern forming substance | |
| TW434517B (en) | Security device | |
| KR20010034101A (en) | Anti-counterfeiting method and apparatus using digital screening |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |