Media information with the raster image and the method of its manufacture

 

(57) Abstract:

The storage medium and the manufacturing method related to the printing industry, in particular for printing important documents. The storage medium has at least one bitmap image, formed by structural elements, each of which has a base geometry and size, which determines the brightness level of the bitmap. The bitmap has at least two adjacent plots, each of which is a specified number of structural elements, while per unit area the number of structural elements on two adjacent areas of different and/or structural elements of at least two adjacent parcels are displaced relative to each other. In the method of manufacturing a data carrier, in particular a valuable document, a bitmap image of the original is divided into at least two adjacent parcel. For each portion of the raster image pick certain per unit area the number of structural elements with different per unit area the number of structural elements of at least two adjoining sections. The size of the structural ele is stromae image is applied to the document by at least two site specific for each site the number of structural elements, the sizes of which correspond to the parts of the bitmap. This information carrier and method of its manufacture to enhance protection against counterfeiting of valuable documents due to the fact that the document contains the structure, forming a moire effect when removing copies of it. 2 C. and 20 C.p. f-crystals, 5 Il.

The present invention relates to a data carrier, in particular a valuable document, at least one raster image, formed by structural elements, each of which has a basic configuration and size, which determines the brightness level of the raster image, and to a method of manufacturing such media. The invention relates also to the media, in particular the valuable document, at least one element of the image formed by several structural elements.

A particular problem inherent in such documents, in particular documents that have a certain value, is the need to protect them from possible tampering, in particular protection from possible forgery of document copying or scanning of the original. One of the possible solutions to this problem are considered in the application EP 0710574 A2, W is in his figure appear Raman distortion (moiré). To this end, the entire document is made bitmap structure with parallel lines. The image on the document is made in the form of bitmap images with changing, as described in the application EP 0085066 B1, contact bitmap structure, the thickness of the lines. Around the bitmap, in addition, in accordance with the modulating function is changed and the distance between the lines. In the result, the entire surface of the picture becomes different and the number of lines per unit length. Modification of the density of lines protects the document from copying, color copying machines or scanners, because the overlay bitmap patterns for at least a certain portion of the document on the scanning raster of a copier or scanner is accompanied by education on the copy clearly visible moire. As such moire on the original is missing and can only be seen on the copy, then the copy can be easily identified as a fake.

Although in this document moire effect at least in certain areas created by the variable line density even when different scanning raster scanner, however, different density of lines across a surface is e plots with high and low density or number of lines per unit area causes that figure seems unsteady and non-uniform and dominant it is not itself a bitmap and raster, resulting in the whole picture looks not enough aesthetic.

The present invention was based on the task of creating a document generating moiré structure, in particular in the raster image, copies of which are formed large areas of moire patterns that distinguish the original from the fakes, and forming a moiré structure simultaneously fits naturally into a bitmap image and is perceived with respect to the bitmap image as its background or background.

This problem is solved by using a document of the type specified above to the distinctive features of the independent claims.

The basic idea of the invention is that the entire surface of the drawing, in which, after copying the generated moire patterns, divided into several sections. Characteristic of each plot is the number of structural elements required to obtain at this site is required brightness levels. The number of structural elements of at least two adjacent participation the structural elements structural elements of one section move relative to the structural elements of the adjacent plot. When the bitmap is drawn on the storage medium is divided into sections with different raster frequency. When you try to copy this bitmap or read it with a scanner in the information processing system scanning frequency scanner or copier is superimposed on various raster frequency applied to the information carrier raster image. This overlapping of frequencies leads to distortion in the reproduced bitmap, which is manifested, in particular, in education for copies of occupying a large surface moire.

Different number of structural elements on the sites bitmap specifies for each plot various raster frequency that provides the appearance of copies of moire even when changing the scanning raster, i.e., when changing the frequency scan or copy. The possible coincidence of the scanning frequency and scanning frequency in some areas of the bitmap does not exclude the formation of moire patterns across its surface.

In accordance with the invention, the image consists of pre-defined areas with a predefined number of structural elements, while and structural elements per unit area of the adjacent site and/or structural elements of at least two adjacent portions of such images are shifted relative to each other. The advantage of this choice of the number or location of structural elements is the formation of copies of distortions, such as moire, even when changing the scanning raster, such as a copier or scanner, in the absence of inhomogeneities on the entire surface of the raster, in particular in the bitmap.

In a preferred embodiment, the structural elements of the plot raster images have the same basic configuration, and the most preferred option is the same basic configuration of the structural elements in all areas of the bitmap. As structural elements, it is preferable to use the line, specified thickness which determines the pre-selected gray tone of each plot. Thus, there is a possibility to create a uniform level of brightness just having a gray image despite the fact that it is divided into many sections with different number of structural elements. If, for example, the number of structural elements on the first segment is n, and the adjacent site is equal to n+10, then the second section will visually look more dark in comparison with the first plot iscrucial the data line width, corresponding to a given gray tone within the same area will be, for example, greater than the width of the line that generates the same set gray tone on the second site, which has more lines than the first segment.

The advantage of the proposed invention the formation of the raster images in the form of plots with different number of structural elements is that the bitmap has a different raster frequencies which are superimposed on the scanning frequency of the scanner or copier that is used to scan the document, with various raster frequency generated by different number of structural elements per unit area, create the ability to overlay the scan frequency on the number of raster frequencies, thereby increasing the probability of formation for copies of moire. Simultaneously, the increase in the number of structural elements on separate sites is not accompanied by a darkening of the image, since the size of the structural elements of the pre-selected using a specific grey area, however, with appropriate preliminary sizing of the structural elements can be hung in the personal tones.

Other features, advantages and preferred embodiments of the present invention are specified in dependent claims and are considered in the description below, with reference to the accompanying drawings on which is shown:

in Fig. 1 is a bitmap image in an enlarged scale from forming moiré structure in accordance with the first variant of the invention;

in Fig. 2A-2G image several draft copies of the proposed raster image shown in Fig.1;

in Fig. 3 is a bitmap image in an enlarged scale from forming moiré structure in accordance with a second variant implementation of the invention;

in Fig. 4A-4B is an image of two draft copies of the proposed raster image shown in Fig.3;

in Fig. 5A-5B two structural element of a raster image in an enlarged scale from forming moiré structure in accordance with a third preferred implementation of the invention.

In Fig. 1 on an enlarged scale shows a picture of the portrait, executed in accordance with the present invention in the form of a bitmap image forming moire structure. The bitmap is divided into 10 divisions is ktorych elements 12. In this embodiment, the entire image consists of 23 bands, the number of which may be long or less. Each strip 14, 16, 22 is associated with a certain number of linear structural elements 12 forming each column of the raster structure. Bitmap image 10 formed of linear structural elements 12 corresponding to the thickness which creates a certain level of brightness in each area of the raster image 10.

Within each column or strip 14, 16, 22 located horizontally linear structural elements 12 may have different raster width and/or the angular position and/or different modulation.

Each strip 14, 16, 22 contains a given number of structural elements 12, i.e., a specified number of lines taking into account the total height of the portrait. The density of lines in the first strip 16 is, for example, 20 lines to see in this example, the first band contains 16 118 lines. The number of lines increases from lane to lane and on the last page 22 in this preferred embodiment, is 171 line.

Because all of the bands shown in Fig.1 of the portrait are the same height, at different number of LINEITEM on each band the number of the structural elements 12, a pixel frequency of the image increases from right to left. At various raster frequency of all 23 stripes in the image at least one raster frequency or at least one a certain number of raster frequencies when scanning or copying images create clearly visible and clearly seen on the image of the moiré, the formation of which is due to the overlapping with different raster frequency image scanning frequency scanner or copier.

This formation of moire patterns provides reliable protection of the document shown in Fig.1 image 10 copy, with a different number of structural elements 12 in different parts 14, 16 and 22 does not spoil the whole bitmap and can also be used for a more clear separation of the edges or corners of the image.

In the example shown in Fig. 1 used structural elements are symmetrically extending straight lines, forming certain tones, with one or another thick line in each area of the image associated with the corresponding brightness level of this area. All lines are perpendicular to the direction of division of the portrait on the strip and can be used for bolante along this corner or edge.

Structural elements can be performed not only in the form of lines, but in the other basic geometric forms, in particular in the form of curves, points, circles, etc.

Although all areas are shown in Fig.1 images have the same width and virtually the same area, however, there are other possible embodiments of the bitmap when you divide it up into lots of different shapes or widths and different sizes. It is also possible within two, preferably adjacent plots to change the basic underlying geometry and/or orientation of the structural elements. This embodiment of the bitmap protects the document from forgery to operating in a wide frequency range scanners or copiers. The distance between the structural elements within one area may be constant or variable, as shown in Fig.1, and in the latter case, the most preferable is the change of the distance between the structural elements according to a certain law. Furthermore, different implementations of the structural elements in different parts of the image ensures that even in case of coincidence of the scanning frequency of the scanner or color copier is at one of the other bands 16, 22 raster image when copying definitely will produce moire. From the foregoing it follows that proposed in the invention, a pixel structure of the image leads to the formation of moire at least at some parts of the copy even when the original is scanned from different angles.

Most preferred is a bitmap whose columns 14, 16, 22 are located at a given distance from each other. In this case, forming a moiré structure becomes more homogeneous, since in the absence of gaps between the forming moiré structures adjacent strips 14, 16, 22 is accompanied by the appearance visually very noticeable abrupt changes or discontinuities in the image. The presence of such sharp transitions extremely negative impact on the visual perception of the appearance of the raster image 10.

In Fig. 2A-2G shows the different copies is shown in Fig.1 bitmap images taken at different settings of the copier. All of these are depicted in Fig.2A-2G and obtained at different angles of scan copies have located in various places bitmap 10 different in appearance is the opium. Comparing these with the moire copies shown in Fig.1 the original, you can quickly and easily establish the fact of forgery of a document copying or scanning.

In Fig. 3 on an enlarged scale showing the second option proposed in the present invention, the raster image generating moiré structure. This image similar to the image shown in Fig.1, and differs from it in that the structural elements on the sections 14 are in contrast to the first, shown in Fig.1 option is not perpendicular, but at a slight angle to the direction of dividing the image into columns.

In Fig.4A and 4B shows two copies of the bitmap image shown in Fig.3. These copies is clearly visible moiré, which was formed during the scanning of the original. Copies according to Fig.4A and 4B differ from each other by the angle of scan is selected to obtain copies shown in Fig.3 bitmaps. It is easy to see that at different scan angles during copying of the original in different parts 14 of the image formed of different kinds of moire. Even without a direct comparison of copies of the original bitmap image of Fig.3 can the naked eye quickly found the m variant forms moire raster image 10 is additionally provided by the tilting of the structural elements 12 within the image 10. This structure is a bitmap image does not reduce the formation of moiré when copying the original and eliminates the possibility to avoid on a copy of moire due to the appropriate selection of the angle of scan. In this regard, it should be noted that the invention eliminates the need for installation on copiers special devices, protecting them from possible copy not to be copied documents.

The invention also eliminates the possibility of making no moire copies by agreeing scanning frequency copier generating moiré structure of the image. Proposed in the present invention forming a moiré structure provides for any copy operations education on copies explicit moire, which is easy to recognize with the naked eye, immediately making the conclusion that this document is a copy.

In Fig.5 on an enlarged scale showing two options for performing structural elements 18, which are similar to the structural elements 12 in Fig.1 and made in accordance with the third preferred option. Structural elements 18 are composed of raster lines 20, which is met color modulation, allows you to create an appropriate motif image. The toning of the image formed by raster lines 20, can be performed, in particular by embossing using a steel stamp, since the depth of such stamping determines the color saturation and allows you to create the necessary key structural element 18 due to the different depths of raster lines 20.

You should pay attention to the possibility of combining the two versions of the image shown in Fig. 1 and 3, with the third option, shown in Fig. 5, when doing this structural element 12 of the options shown in Fig. 1 or 3, in the form of a structural element 18 for the variant shown in Fig.5.

May be the case when a pattern formed on the copies of the image produced by the third variant according to Fig.5, it will be impossible to detect with the naked eye, however, and with all the fakes can be easily identified if you use a magnifying glass to clearly see all the differences formed by the raster lines 20 raster patterns of the original and the copy.

In addition to the split bitmap image 10 in the embodiments shown in Fig.1 and 3, sections 14 having the form of a ver is th form preferably not in the form of plots strict geometric forms-squares, rectangles, triangles, etc. in accordance with the invention, at least two adjacent image areas should differ from each other by the number on each separate section of the structural elements, in particular lines, and/or orientation located on different parts of the image of the structural elements and/or shape of the structural elements, which, if they are formed by the lines can be straight, wavy, brokerfactory, etc. This new type of raster image makes meaningless all attempts to scan or copy with the image of the document and makes it easy to determine that the scanned or copied document is not the original, but a reproduction of it.

The inner surface brokerfactory pattern can also be used as separate parts of the bitmap. The formation of moire on blakeshelton figure when it is copied provided different angles, different number of lines per unit area, and/or a different type of lines on its individual areas.

2. Media information under item 1, characterized in that all the structural elements (12, 18) of one or more sections (14, 16, 22) have a uniform basic geometry.

3. Media in p. 2, characterized in that provides the ability to set the size of structural elements by a predefined symmetric increase the size of their underlying geometry.

4. The information carrier according to any one of paragraphs.1-3, characterized in that the structural elements (12, 18) represent a line.

5. Media under item 4, characterized in that all the lines (12, 18), forming a raster image (10), are located within n the tion under item 4 or 5, characterized in that the lines (12, 18) are arranged essentially perpendicular to the direction of dividing the image into sections (14, 16, 22).

7. The information carrier according to any one of paragraphs.1-6, characterized in that the specified size of the structural element (12, 18) corresponds to the specified brightness level within the site (14, 16, 22) of the image.

8. The information carrier according to any one of paragraphs.1-7, characterized in that the possibility of establishing between the structural elements (12, 18) within the site (14, 16, 22) of the image constant or changing in a predetermined functional dependence of the distance.

9. The information carrier according to any one of paragraphs.1-8, characterized in that the raster image (10) is printed on the media.

10. The information carrier according to any one of paragraphs.1-9, characterized in that it is a banknote, identification card, smart card, etc.

11. The information carrier according to any one of paragraphs.1-10, characterized in that the sections (12, 14, 22) of the image represent strips, spaced columns, each of which has a specified width.

12. Media information on p. 11, characterized in that all of the strips (12, 14, 22) have the same set W is of have the same area.

14. The information carrier according to any one of paragraphs.1-13, characterized in that at least two adjacent sections (14, 16, 22) structural elements (12, 18) have a different orientation and/or basic geometry.

15. The information carrier according to any one of paragraphs.1-14, characterized in that a predefined number of structural elements (12, 18), per unit area, is selected so that when scanning media scanner was formed moire.

16. The information carrier according to any one of paragraphs.1-15, characterized in that the sections (14, 16, 22), which are pre-broken image, located at a specified distance from each other.

17. The information carrier according to any one of the preceding paragraphs, characterized in that there is at least one element of a picture represented by the structural elements (18) which is formed by raster lines (20), forming a raster structure.

18. Media under item 17, characterized in that the raster structure is formed by many raster lines (20), which are within the structural element (18) are arranged essentially in parallel.

19. Media under item 18, characterized in that the edge is the procedure of carrier production information, particularly valuable document, at least one raster image (10), formed by structural elements (12, 18), which have a base geometry and the specified size, which determines the brightness level of the raster image (10), characterized in that the raster image of the document is divided into at least two adjacent parcel (14, 16, 22), for each section (14, 16, 22) bitmap pick up a certain per unit area the number of structural elements (12, 18) with different per unit area the number of structural elements (12, 18) at least two adjacent sections (14, 16, 22), the size of structural elements (12, 18) at each site selected depending on located on top of it plot the bitmap and the bitmap is applied to the document by applying to him at least two sections (14, 16, 22) bitmap specific for each site the number of structural elements (12, 18), the dimensions of which correspond to the parts of the bitmap.

21. The method according to p. 20, characterized in that the structural elements are printing method, gravure printing using a steel stamp.

22. The method according to p. 20, and is of ini.

 

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