EP0513195A1 - Procede de formation d'images non reproductibles par photographie/photocopie et produit ainsi realise - Google Patents

Procede de formation d'images non reproductibles par photographie/photocopie et produit ainsi realise

Info

Publication number
EP0513195A1
EP0513195A1 EP91904412A EP91904412A EP0513195A1 EP 0513195 A1 EP0513195 A1 EP 0513195A1 EP 91904412 A EP91904412 A EP 91904412A EP 91904412 A EP91904412 A EP 91904412A EP 0513195 A1 EP0513195 A1 EP 0513195A1
Authority
EP
European Patent Office
Prior art keywords
image
document
copy
photocopier
matte
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.)
Withdrawn
Application number
EP91904412A
Other languages
German (de)
English (en)
Other versions
EP0513195A4 (en
Inventor
Ralph C Wicker
Frederic T. Morelle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0513195A1 publication Critical patent/EP0513195A1/fr
Publication of EP0513195A4 publication Critical patent/EP0513195A4/en
Withdrawn legal-status Critical Current

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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/08—Photoprinting; Processes and means for preventing photoprinting
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/04—Preventing copies being made of an original
    • G03G21/043—Preventing copies being made of an original by using an original which is not reproducible or only reproducible with a different appearence, e.g. originals with a photochromic layer or a colour background

Definitions

  • This invention relates generally to protected documents, those documents having some intrinsic value that is readily recognizable on their face. More particularly, the instant invention deals with the method for producing a document that will be nonreplicable by modern photographic/photocopy techniques. Specifically, the photographic replication which is to be defeated by the instant invention is that which would result in or could be used to provide a color transparency or a high resolution positive (or negative) from which a printing plate may be made in order to reproduce the document that was photographed.
  • the Field of the Invention is properly that art which deals with document security systems, antiphotocopy documents and antiphotographic documents, insofar as they are used to thwart counterfeiting activities.
  • the instant invention although unique in its own right, derives from one of the instant inventors ' inventions dealing with nonreplicable documents and methods for producing same, subject of United States Patent Application, No. 298,020 ('020) filed on 18 January 1989 and entitled "COUNTERFEIT PREVENTION", priority established by PCT/US 90/00221 in WO90/08046, published 26 July 1990. Those documents shall provide a significant portion of the background topic in the instant application.
  • a protected document included background printed matter and line pattern printed warning indicia, a compound imaging process akin to "cloaking".
  • the warning indicia are slurred (a characteristic of all types of photocopiers) and become visible.
  • the technique exploits copier directional slur, a phenomenon caused by toner drag, or the elongation of the trailing edges of images as toner is deposited onto copying drums.
  • the resultant Caprio product is a protected document comprising a substrate having a surface, background printed matter on a first portion of the surface, and warning printed matter on a second portion of the surface, within the first portion.
  • the warning printed matter is formed such that, upon xerographic copying of the document, the warning indicia slurs to become visible.
  • the background printed matter is a dot pattern, printed on the face surface with a dot pattern screen of 5% density and 133 rows per inch. This density and pitch (the number of rows per inch) is significant in that, after one of the instant inventors had made the previously mentioned nonreplicable document (see Field of the Invention), a retrospective look at the Caprio et al.
  • Mowry, Jr. et al. in U.S. Patent No. 4,310,180 discussed the method of making a protected document. They disclose a protected document, such as a negotiable instrument, which is to be protected by their technique from illegal copying by color copiers. Their method is, in some respects, similar to predecessor methods, essentially preprinting a particular word, warning or cancellation phrase pattern in a half tone or multi-tone on a document and, thereafter, camouflaging the pattern by placing over the cancellation phrase a random line background mask effecting the disappearance of the cancellation phrase into the background design. The instant inventors term this "cloaking" because there is a definite intent to cover one form of visible print with another, a technique and expense they avoid.
  • the device sees only the image directly under its scanning or imaging field; and that is an array of straight lines (the scan lines). Thus, if the device does not scan an object, it does not “see” it, does not record it, and does not replicate it. It is thus “blinded” by a virtual grid corresponding to the scan line spacings or “not see” zones. It was recognized that in this discovery lay the key to solving the copier replicating problem. We used the moire effect to reveal the bogus color copy of a genuine banknote, for example, by producing the banknote image lineation pitch (see definition hereinafter) in purposeful mismatch to the scanner frequency of a (color) copier. Additionally, the lay-down or printing pattern is deliberately altered, portionwise, in azimuth and/or pitch throughout the document by either a single printing (from a single plate) or a montage of either separate printings or a special compound (image) plate.
  • the invention was conceived to counteract a specific illegal threat, without having to resort to legislative action which would in some way hinder the technological growth and refinement of the photocopy machine industry, and limit its most noteworthy products. Quite simply, if a photocopier (of any advanced design) relies upon a discrete scanning protocol, it can be defeated as a counterfeiting device by incorporation of the '020 invention therein.
  • Bloom or Flare A phenomenon where light, either direct or reflected, overwhelms a recording medium, surface or device such as a photon detector, an occular retina, a photographic emulsion or the like, so that the recording medium (or surface) does not record or sense all of the content in contrasting darker areas of the image, specifically the lineations comprising the image..
  • Bloomable or Flareable Image An image which reflects light disproportionately from the various pixels that compose the image, by projecting to a recording medium diminished contrast between lighter and darker areas because of the preponderance of lighter pixels adjacent a darker one.
  • Image A marking made on a matte or integrally formed therein.
  • An image may be lineations, pictures or portraits.
  • the pictures or portraits are geometric patterns or images of persons and are generally comprised of various lineations.
  • Lineations Multiple lines in an etching, print, or similar reproduction which are comprised of dots, lines/hooks and swirls and comprise the detail of which an image is made.
  • a lineation may be straight or curvilinear and is merely a general description of in-line dots, lines/hooks and swirls.
  • Line Pitch The frequency (f) of repetition in printed indicia such as lineations.
  • Matte A substrate for containing an image therein or thereon.
  • a matte is generally, but not always, a high quality rag or rice paper, polished to varying degree. It may also comprise printing plates , platens or similar picture formative means.
  • Picture Formative Something such as an engraving, a photo-replicator or the like that is used to make images on suitable mattes by facilitating transfer of inks, dyes and similar marking stuff. .
  • Replication An exact image or picture reproduction, true as opposed to imperfect, bogus or inaccurate.
  • replication, replica, etc. shall be used to express a true reproduction; while nonreplication, nonreplicable, etc. shall mean that a document or image having such characteristics, when copied, is counterfeit or bogus to the casual observer.
  • Stuff The material out of which something may be shaped or made, raw or unwrought material.
  • Figure la is a small portion of a printed image
  • Figure lb is a nominal grid overlay
  • Figure lc is the superposition of the Figure lb grid on the Figure la print;
  • Figure 2a is an alternate embodiment of a print similar to Figure la;
  • Figure 2b is a stylized rendering of an image with a detail of the lineations forming the image
  • Figure 3 is an artist's sketch of a well known portrait which appears on a national currency bill
  • Figure 3a is an artist's rendering of the print detail of the Figure 3 image embodying the instant invention
  • Figure 3b is an artist's rendering of a copy of the Figure 3a image produced by a modern photocopying machine
  • Figures 4a-4d are illustrations of the types of lines, dots and hooks used to construct lineations of the invention in graduated detail
  • Figures 5a-5e comprise a series of illustrations which depict a general method for placing the image into picture formatives such as printing " plates;
  • Figure 6 is flow sequence of a method for making documents of the invention using a photocopier
  • Figure 7 is a flow chart similar to Figure 6, but applicable to a non-photocopy production method.
  • Figure la discloses the '020 and '903 inventions 10 rather succinctly.
  • An image is created, on a suitable matte M by forming lineations, that is, curvilinear marks that are comprised of lines 12, dots 14 and swirls 16, into pictures, portraits or other forms of visible imagery.
  • "Curvilinear”, as used herein, means small curves or hooks at the ends of dots or lines. This is done according to a certain protocol which is illustrated in the following Figures lb and lc.
  • Figure lb the reader observes a simple grid barrier comprised of opaque horizontal slats 17 and vertical slats 19. The spaces between the grid elements 17, 19 are indicated generally as voids 18.
  • virtual image is used herein because the viewer or recorder does not see/sense an image as it is accurately portrayed on its matte or substrate medium, but rather as it appears to the senses/sensor. It is an image which has been distorted by some interfering grid-like phenomenon.
  • the phenomenon may be real, such as the grid of Figure lb or it too may be virtual, such as an inability to see or perceive. For example, if a person were to observe an image through a defective eye, say an eye which possessed a damaged retina so that the entire image was not sensed, the actual perception of the observer would be entirely different from that of an observer with normal vision.
  • the philosophical transition made by the instant inventors is to select a virtual grid for an actual one.
  • the imaging ' apparatus is a video scanner (opticon and the like), a photocopier scanner or a camera.
  • an image 10 is made on a suitable matte M with lineations 20 (comprising dots, lines and swirls) spaced at a distance which will be minutely less or more than the scanning frequency, or some frequency factor such as (f ⁇ interger), of the aforementioned devices.
  • lineations 20 comprising dots, lines and swirls spaced at a distance which will be minutely less or more than the scanning frequency, or some frequency factor such as (f ⁇ interger), of the aforementioned devices.
  • the scanning device "viewing area” will be in registry with discrete image parts and the machine thereby recording lineation 20 of the image 10.
  • the "seeing line” of the scanner will soon be out of registry with the lineation pitch of the image 10 and, since the device will no longer be able to "see” all of the lineations 20, the device will not be able to record and reproduce the document bearing the image with any reasonable degree of accuracy.
  • the instant inventors use the term "nonreplicable document” to describe any document bearing an image such as that first described (10) because it cannot be replicated accurately.
  • the bottom left hand lineation comprised essentially of characters such as a lower left hand dot 14' is of a thickness significantly less than the pitch distance d.
  • the instant inventors will digress slightly to more thoroughly explain these facets of the invention.
  • Relative to tone as it applies to the printing of documents, the actual print must be of a certain opacity and the density thereof should be at least .05 in reflective density, where such reflective density is proportional to the area that is being covered by the print.
  • opacity is related on a relative scale of 0.0 to 3.0, the former being white-white and the latter, solid black.
  • black is 3.02.
  • the average density (reflective) of a solid image in the printing art is 1.60..
  • Reflective density on paper or similar substrate is also dependent on the substrate composition — called “trap”.
  • the matte surface being uneven allows the ink image to bleed or peek through to the other side and, in some cases, allows it to actually soak through to the second side or other side of the matte.
  • This phenomenon is called “offset”. This is best exemplified if the reader examines a currency note and observes on the obverse that images bleed through from the reverse side.
  • the offset phenomenon is only one factor, albeit an important one, in reducing the reflective density of the ink on one side of a printed document. Factors contributing more or less to offset are tack and pressure, of the ink and press, respectively.
  • any attempt to recopy the finished image by photographic means is unsuccessful and attempts to recopy by xerographic (photocopy) means or any optical scanning means (telecopier), produced absolutely outstanding results in that the resultant product was completely darkened.
  • the bloom or flare aspect of the image indicia predominated over the line pitch/azimuth/dissonant character and, in fact, will suffice under the circumstances of use mentioned herein.
  • Figure 2b depicts, at the left hand side, an artist's rendering of what is normally a printed image seen in the traveler's check printed art. At the right, a detail of such an image could be rendered accordingly.
  • the invention disclosed in Figures 1a - lc is incorporated in sectors ranging from about 0 degrees to about 45 degrees in arc.
  • Sector I is skewed from Sector II.
  • Sector III which is in alignment with Sector IV, is offset pitchwise so that a scanner, clearly "seeing" a line in Sector III, would probably miss its counterpart in Sector IV. This is assuming, of course, that the person attempting to counterfeit the image would have turned it so that the scanning device would scan orthogonally and not in the usual bottom to top fashion.
  • Sectors V and VI differ in pitch d and in pitch azimuth (arc d) .
  • Such a torturous layout is felt necessary to thwart counterfeiters that would attempt to take several scannings along differing scan azimuths and use a computer to resolve inaccuracies or omissions on a pixel-by -pixel basis.
  • Sector VII shows an embodiment of all of the aforesaid techniques, save the tonal gradation, as may be embodied in a document utilizing the invention in its fullest sense.
  • Figure 3 is an artist's rendering of the Jackson image as it appears in a United States twenty dollar bill. Since United States currency is produced from an engraving, and printed in the intaglio method, a Figure 3a detail would illustrate the previously described facets of the instant invention, with the exception of tonal gradation. Were such a document copied on a color copier, even of the most modern type, the resultant (counterfeit) image of Figure 3b would contain such obvious defects and omissions that the counterfeit virtually would be unpassable. Most noteworthy in the Figure 3b effects would be the omission of detail 40 above the eyes, and loss of a great deal of the horizontal grid integrity 42 from the background area of the portrait.
  • One of the methods for producing a document with the instant invention and, particularly the invention of the '020 application is to make, as close as possible, a photoreplica of a true document on a modern color copier. Because the matte is altered by the heat of the developing process, the lineations of the replicated image will differ minutely from the scanning pitch of the copier. Thus, the replication will contain the instant invention. If the replication is made onto a plate, documents may now be printed containing the invention which has been literally provided by the copier. This was first taught in "020 when the instant discovery, that a copy machine could not accuately replicate its own copy, was first revealed.
  • the replication may also be given the "feel" of a true printed document by merely overprinting or underprinting the copier (copy) with a common printer's varnish.
  • the varnish would be applied by means of a print formative such as an intaglio or offset plate.
  • Such a varnish is clear and often without hue or tone, but may contain such.
  • More than one layer is generally preferred. If at least one layer of varnish is applied by over/under- printing a copy machine replica, a document will be obtained having all the looks and "feel" (that is, sense to the touch), of a genuine certificate. In fact, it may serve as the genuine certificate and thus, embodying all the aspects of the instant invention, replace the genuine certificates of that type that are so easily counterfeited.
  • the printer wishes to incorporate• he tonal gradation facet of the instant invention, more than one overprint of varnish may be used. This time using a different toned or hued varnish. In this instance, the plate for such printing must be made so that the varying tones or hues of varnish will be layed down between the lineations 20 or some other refraction-disturbing pattern is employed. As those of ordinary skill may readily surmise, it is not necessary to apply this tonal gradation technique only to a photocopy or replica; but rather, it may be applied to any printed document, particularly offset printings.
  • a primary coat of varnish may be applied directly to the matte. Then, if that coat is one defining an image not visible to the unaided eye, that image will be revealed upon attempted photo replication of the finished document because the overprinted image is not seen by the photo replicating machine scanner. Moreover, the varnish image will be replicated either darker or of different color from the original coat image, a distortion caused by the differences in refractive indexes of air and varnish (even though both appear to be clear or nearly invisible).
  • Figures 4a-4d are graduated serial definitions of illustrations depicting, first in Figure 4a, a portion of an image comprised of lineations of a certain pitch and an inner section 60 thereon.
  • Figure 4b is a detail of Figure 4a taken at circle 4b. This is done to show the reader that the indica are lines, not only of different azimuth, but of different pitch, as well.
  • Figure 4c is a larger detail of the Figure 4b intersection 60 area.
  • Figure 4d is a blow-up and exaggeration of the intersection 60 area depicted as a rectangle in Figure 4c.
  • lineations 20 are depicted as a series of lines, dots, hooks or swirls arranged according to a consistent pitch d 1 or varying pitches d' ' .
  • Machine scan lines l ⁇ and 2 clearly illustrate how components of various lines would be "seen” by a photoscanning means, but also, critical portions would not be seen and recorded between the lines, herein depicted as a space s.
  • a couple of the techniques for embodying the invention in a document rely upon the maker of the particular picture formative (generally a printing plate) to take careful cognizance of the factors depicted in Figure 4d.
  • Figure 4d is depicted with but two colors, a dark and a white, or black and white.
  • an image may be formed in black lineations or what appear to be shades of black and gray. Were three colors to be used, the same techniques would apply for assuring that various components of the color would not be seen if other components were to be seen.
  • Figures 5a-5e illustrate how one would go about making a plate formative, either by computer or hand engraving, so that the invention would be embodied in the formative and, of course, in the resulting document printed by the formative.
  • Figure 5a represents a three color-component pixel X and the succeeding Figures 5b-5e illustrate the sequence of actions that would be taken to embody pixel X into a document bearing the invention X' .
  • the process proceeds essentially as follows: a negative is made of the image thus rendering the three colors a, b and c distinctive as shown in Figure 5b. Then, as depicted by Figure 5c, a positive is made of.pixel X screened with a preselected screen frequency as shown in Figure 5c.
  • 1- , ⁇ 2, etc. represent the photoscanner or photocopier scan lines; and s represents the spaces between the "seeing" scan lines, or the "no see” zones.
  • Figure 5d represents the pixel X as it would appear on a three color plate with the invention formed therein.
  • the reader should note that when making the plate, and in order to maintain the proper color, tone and hue that was originally that of pixel X, it is necessary to compensate for the lack of the color components by making deeper wells or using darker color components to print the document.
  • the document pixel X' as shown in Figure 5e is composed of colors a', b' and c' to indicate their color and tone difference from the pixel of Figure 5a.
  • the first, direct screen image creation was essentially described in the description of Figures 5a-5e.
  • a film negative of a picture (in whole or part) is photographed.
  • a variable tone line screen which emulates the line screen of a laser black and white or color copier, is placed in registry and in contact with the negative and both are placed in contact with a new film.
  • the first grid photocopier scanning pattern
  • the thickness of this grid is important, as well as its pitch.
  • the new film is then exposed and developed. This film is either a negative or a positive and is used to produce a printing plate of the invention image as shown in Figure 5d.
  • imagery as a montage several parts of a document are so treated with screens of differing pitch that are rotated about the z axis of the images' x-y planes.
  • the various screens correspond to various photocopier scan copy (frequency) protocols.
  • the instant inventors are familiar with the following addressed techniques of copier and computer operation, but claim no expertise therein. Nevertheless, a skilled copier, computer operator or printer is capable of acquiring the articles of the invention by application of the methods that follow.
  • Relative to electronic scanning creation a picture formative (plate) or document of the invention may be created using many of the computer-controlled systems that are available today. Reference to Figure 6 will give the reader a broad view of such a method.
  • An original copy, engraving or a picture is scanned and entered into memory of a digitized computer imaging system.
  • a digitized line screen that is a geometric match to the line screen of a selected laser copier.
  • line screens may be stored in memory for such a purpose.
  • the image that was scanned is presented on the video-corn or monitor, and enhanced by contrast and size for reconstruction.
  • the line screen is also summoned as a screen overlay and the image is then reconstructed to follow or "map into” the line screen paying special attention to place critical color components in as thin lineations as possible.
  • a negative is output and is used to produce a printing plate with the invention's image.
  • the various screens and azimuths may be employed granting the finished negative the multi-azimuth and pitch variations of the aforementioned montage.
  • Photocopier creation is perhaps the most expedient means of creating the invention in a picture formative.
  • An original copy artwork, engraving, or picture is placed on the platen of a laser copier.
  • Film transparencies are placed in readiness in the blank paper tray of the copier, hereinafter termed "film tray”.
  • Copier adjustments are made in that the laser potentiometer is adjusted to produce maximum beam sharpness while copier settings such as "detail” and “contrast” are adjusted to produce the sharpest copy line image and the "black mode" of the copier is activated. Changes to pitch, azimuth, line or dot pattern, without changing the astetic look of the original, may be made by numerical control subsystem (if available) to the copy.
  • the copy may be divided into one or more sections, with each section being placed on a copier platen at a given azimuth which empirically is seen to produce the greatest interference between the original design image and that resulting from the new azimuth placed on the platen.
  • Each change of azimuth, relative to the original document is treated as a separate section and the film transparency is produced of each.
  • One master film is produced of the copy as a composite of all the parts. The master film is then selected for registration and each section is then registered to (mapped into) the whole original by the above process. Separate masks are created of each section or part of the whole copy that was selected bearing an azimuth change.
  • Positives of the masks are then created and, a new piece of film is placed in the film tray and each mask is exposed separately and in registry with the selected section while masking the background around it with the positive to create a film negative (or positive) which is a whole of the original.
  • the film is then used in a conventional manner to produce a printing plate for the replication of invention documents.
  • Direct plate image creations is also an expedient manner of producing picture formatives (plates) and the invention documents by use of a copier.
  • a plastic or paper printing plate (the film which is etched for offset printing) is placed in the paper tray of the copier, now redesignated "film tray" for these procedures.
  • An original copy of the document to be rendered noncopyable is placed on the copier platen.
  • Adjustments to the copier are made as were done previously in the explanation of photocopier creation techniques, and a copy is made in black only onto the surface of the printing plate film.
  • the plate-film is then etched, placed on an offset printing press and multiple copies are produced of the invention document. This is the most cost-expedient and first attempted method that we employed for making the invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Printing Methods (AREA)

Abstract

Techniques de production d'images non réplicables. On a produit des images sur des trames (M), notamment celles de documents de valeur, ainsi que des trames de manière à obtenir des documents non réplicables (10). Le rendu d'images sous forme de réseaux de traits (20) composés de lignes (12), de points (14) et de volutes (16) en un format de pas prédéterminé (d) variant très légèrement par rapport au pas de balayage d'une photocopieuse, est détaillé. En outre, le rendu de ces images sous forme de traits, de préférence simplement de points et de lignes courtes en forme de crochet, entourés par un milieu de perturbations photographiques telles que des colorants/peintures/encres/résines ou matière d'impression plus clairs disposés en un format omnidirectionnel fait également échouer la copie photographique.
EP19910904412 1990-02-02 1991-02-04 Anti-photographic/photocopy imaging process and product made by same Withdrawn EP0513195A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US473903 1983-03-10
US47390390A 1990-02-02 1990-02-02

Publications (2)

Publication Number Publication Date
EP0513195A1 true EP0513195A1 (fr) 1992-11-19
EP0513195A4 EP0513195A4 (en) 1993-06-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910904412 Withdrawn EP0513195A4 (en) 1990-02-02 1991-02-04 Anti-photographic/photocopy imaging process and product made by same

Country Status (7)

Country Link
EP (1) EP0513195A4 (fr)
JP (1) JPH05505983A (fr)
AU (1) AU7316991A (fr)
BR (1) BR9105977A (fr)
CA (1) CA2075063A1 (fr)
FI (1) FI923474A (fr)
WO (1) WO1991011331A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2262065A (en) * 1991-12-07 1993-06-09 Moore Business Forms Inc Security printed document resistant to xerographic copying.
AU698312B3 (en) * 1998-03-02 1998-10-29 Thomas M. Wicker Document protection methods and products
AU694719B3 (en) * 1998-03-02 1998-07-23 David M. Wicker Embossed document protection methods and products
DE10044403A1 (de) 2000-09-08 2002-03-21 Giesecke & Devrient Gmbh Datenträger mit Stichtiefdruckbild und Verfahren zur Umsetzung von Bildmotiven in Linienstrukturen sowie in eine Stichtiefdruckplatte
US8323780B1 (en) * 2004-10-08 2012-12-04 Hewlett-Packard Development Company, L.P. Ink coatings for identifying objects
JP4682281B2 (ja) * 2004-10-29 2011-05-11 独立行政法人 国立印刷局 モアレを防止した線画を有する画像形成体
US7455013B2 (en) * 2005-03-08 2008-11-25 Hewlett-Packard Development Company, L.P. Secure printing method to thwart counterfeiting
CA2631878A1 (fr) 2005-12-05 2007-06-14 Commonwealth Scientific And Industrial Research Organisation Procede de formation d'une image securisee
DE102007063275A1 (de) * 2007-12-27 2009-07-02 Giesecke & Devrient Gmbh Sicherheitsmerkmal für hohe Kippwinkel
WO2009121141A1 (fr) 2008-04-03 2009-10-08 Commonwealth Scientific And Industrial Research Organisation Procédé à images cachées et appareil à images cachées

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146151A1 (fr) * 1983-11-16 1985-06-26 De La Rue Giori S.A. Papier valeur
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EP0279526A2 (fr) * 1987-02-18 1988-08-24 CarnaudMetalbox plc Document de sécurité
GB2217258A (en) * 1988-03-24 1989-10-25 Suomen Pankin Setelipaino A security document with a warning pattern and a method for the preparation thereof
EP0353544A1 (fr) * 1988-07-28 1990-02-07 Michael Huber München Gmbh Pigments goniochromatiques, procédé de fabrication et utilisation dans la fabrication d'encres d'imprimerie
WO1990008046A1 (fr) * 1989-01-18 1990-07-26 Wicker Ralph C Document non reproductible et procede de production

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Also Published As

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EP0513195A4 (en) 1993-06-23
JPH05505983A (ja) 1993-09-02
BR9105977A (pt) 1992-10-20
WO1991011331A1 (fr) 1991-08-08
CA2075063A1 (fr) 1991-08-03
FI923474A0 (fi) 1992-07-31
AU7316991A (en) 1991-08-21
FI923474A (fi) 1992-07-31

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