A method of manufacturing printed products with a primary and a latent image
The invention relates to the printing industry. The invention consists in that the hidden image is converted into a digital hologram in the scheme of obtaining the Fourier hologram with the reference point source, and a randomized phase of the subject radiation, get her image and produce print products, changing from print to print the mutual position of the main image and the image of the hologram. In the case of multicolor hidden image to produce color separations, expect hologram on the respective color channels in terms of matching coordinates of the reference sources, and different implementations of the randomization phase of the subject radiation and receive a multicolor hologram. The technical result is to increase the degree of security printing products from tampering with the simplification of the recovery of the latent image. In addition, the invention simultaneously expands the creative possibilities in the design of printed products. 1 C.p. f-crystals, 7 Il. Anti-counterfeit printed products, especially in connection with the development of technology copy, continuously improved. One of the areas in the field of protective teheh holograms with products printing by sticker or stamping. Holograms are applied to labels, excise stamps, packaging, securities, etc. As a rule, optical holograms used in the printing industry, are so-called rainbow holograms, which allows to reproduce a color three-dimensional image in natural light (see, for example, P. Hariharan, "Optical: Holography:principles, techniques and applications", 2nded, Cambridge University Press, New York, 1996, p. 131). These holograms are decorated with printed products, and the presence of them until recently served as a satisfactory protection in view of the novelty and its scarcity technologies and techniques rainbow holograms. To date, the situation has changed, the market has a complete equipment for optical holographic laboratory, including roll machine duplication of holograms. Thus, reproduction of any hologram and its mass production is quite easy to implement.To improve security in the composition of rainbow holograms are often included classic flat hologram diffuse-lit subject (see, for example, P. Collier, K. Burkhart, L. Lin, "Optical holography", "World", M, 1973, page 222). The subject in natural light hologram is not observable, its image is hidden and Rhea with a prevalence of holographic technology, but its presence cannot be considered as a design element, because when the local registration it is matte spot size of the order of a millimeter, and its registration on the main square of the hologram reduces the brightness and contrast visually observable image. In addition, the disadvantages of this method include the need for application at the stage of recovery of the latent image with such holograms special optical devices with sources of coherent radiation.With the proposed solution, this method coincides with the fact of the use of holographic principles of formation of the latent image and the introduction of the image of the hologram along with the main image in printing products.There is also known a method of manufacturing printed products with a primary and a latent image consisting in the transformation of the hidden image in the digital hologram in the scheme of obtaining the Fourier hologram with the reference point source, and a randomized phase of the subject radiation (P. Hariharan, "Optical: Holography:principles, techniques and applications", 2nded, Cambridge University Press, New York, 1996, p. 171). The advantage of this method is the ease of recovery of the latent image by introducing common programs, for example, the program Mathcad 2000 Professional". In addition, the visual observability of holographic patterns can be used to design products, for example, to decorate the background, spot elements, etc., the Disadvantage of this method from the point of view of security printing products from forgery is the triviality of kopiowania individual imprint and its subsequent replication.With the proposed solution, this method coincides on the following essential features: convert hidden image in the digital hologram in the scheme of obtaining the Fourier hologram with the reference point source, and a randomized phase of the subject radiation, obtaining images of the hologram and printing products.On the essential features of the latter method is most similar to the proposed method and selected as a prototype.The inventionThe proposed method for the manufacture of printed products with a primary and a latent image is that the hidden image is converted into a digital hologram in the scheme of obtaining the Fourier hologram with the reference point source, and a randomized phase of the subject radiation, receive the image halogenoacetyl other when changing from print to print the shift value.The proposed method differs from the prototype in that the image of the hologram and the main image shift when printing with respect to each other when changing from print to print the shift value.This difference provides a higher degree of security printed products from a fake due to the individualization of each print, and the quality and location of the restored image in field observations do not depend on the magnitude of the shift, i.e., provided the identity of the playback with non-identical prints. The latter is a consequence of the known properties of planar holograms to leave the fixed recoverable image when moving the hologram itself (see, for example, P. Collier, K. Burkhart, L. Lin, "Optical holography", "World", M, 1973, page 245). Direct copying of individual impression and printing duplication will lead to identical prints that will indicate a fake.In the development of this method is proposed a method in which additionally produce color separations hidden image, calculate holograms for each color in terms of matching coordinates of the reference sources, and different implementations of Raba different holograms have different range of structures due to different implementations of randomisity phases of the subject of radiation, that enables multi-color image printing, holograms and as a result, to recover the latent image in color. The proposed method enhances the security and expands the creative possibilities for the design of products using complex multicolor structures.The essence of the proposed method is illustrated by drawings, where Fig.1 and 2 show respectively examples of the main image, in the General case, multicolor, and hidden in black and white. Frame (Fig.1) shows the actual dimensions of the imprint.In Fig.3 shows the result of the conversion hide negative image (Fig.2) in the image of the hologram calculated scheme to obtain the Fourier transform of the hologram with the reference point source and diffuse scatterer, randomizers phase of the subject radiation.In Fig.4 shows a topographic background, composed of holograms Fig.3 without discontinuities at the joints.In Fig.5 shows the page format 210 × 297 mm, where the background of Fig.4 sealed main image Fig.1 so that the distance between the main image is not a multiple of the repetition period of holograms on a background that provides non-identity of the key and is obtained from one of the areas with the main image of Fig.5, a in Fig.7 - rebuilt with him the latent image. The recovery image is calculated by using the inverse Fourier transform applied to the image of the imprint entered into the computer while scanning.When color hidden image to produce color separations, for example, the primary colors of the RGB space and in each of the three color channels calculate the hologram on the same algorithm as the hologram of a black and white image. When calculating the coordinates of the reference sources for all channels is chosen matching, but change the diffuse scatterers, i.e. the realization of a random uniform distribution of phases of the subject of radiation through the channels differ from each other. By combining the color channels receive multicolor hologram, create holographic background and produce printing the main image as in the case of monochromatic holograms. To restore the color of the latent image separate print scan in color, produce color separations of the scanned file, for each color channel apply the inverse Fourier transform and get a color image when combining color channels.List of figuresBigblog image.Fig.4 Holographic background with black and white hidden image.Fig.5 Sealant background Fig.4 main images.Fig.6 the Scanned print.Fig.7. Restored hidden black and white imageThe possibility of carrying out the invention will illustrate with a specific example.Suppose you want to print the label 60x60 mm with the main image shown in Fig.1. As the hidden image will choose the black and white image shown in Fig.2. Image created in Adobe Photoshop 4.0 in BMP format on a field size of 512 × 512 pixels.Hide the image is inverted (converted to negative), broadcast in the program Mathcad 2000 Professional using READBMP. The corresponding square numeric matrix of size 512 × 512 And denote its elements a, j, where i=0...511, j=0...511.Using generate random numbers with uniform distribution in the interval 0-2- - rnd(2) - is a square matrix B=rn(2), the complex-valued matrix with elements ciJ=exp(kbiJ), where k is the imaginary unit, and the matrix D as the elementwise product of matrices a and C: diJ=aiJCiJ.
desirable brightness and contrast of the subsequently produced holograms. In this example, element d2i5, 2i5assigned a value of 104. Using CFFT two-dimensional fast Fourier transform is a complex-valued Fourier transform F of the matrix D:E=CFFT(D) converted to a normalized image of the hologram according to the algorithm:The matrix S has the same dimension as the matrix a, and the operation of finding module and squaring are applied elementwise. The denominator is the maximum value of the matrix element /E/2.The image of the hologram G shown in Fig.3. Adobe Photoshop 4.0 this image multiplicities without discontinuities at the joints. In Fig.4 shows the thus constructed holographic background size x pixels (respectively h mm). Its color tone can be picked up by conventional means Adobe Photoshop 4.0.This background on the construction of dvojakoperistye with a period of 512 pixels, which implies that the main image may take relative to the background 5122=262144 different positions. This is a possible circulation of non-identical labels in this specific example of implementation of the proposed method.In Fig.5 shows an example sepecat the main images are made so as that distances vertically and horizontally between them were not a multiple of 512 pixels. The obvious non-identity fingerprints on the location of the main image relative to the background image.The recovery of the latent image by typing in a computer image of the individual impression by means of the scanner (Fig.6), broadcast scanned file into the program Mathcad 2000 Professional using READBMP and application functions inverse fast Fourier transform ICFFT. In Fig.7 shows the result of the restoration.In the case of a color hidden image created in Adobe Photoshop 4.0, broadcast in the program Mathcad 2000 Professional is the three functions READ_RED, READ_GREEN, READ_BLUE performing the color separation of the color image. The corresponding matrix will be denoted by Al, A2, A3. Next, using the function for generating random numbers with uniform distribution in the interval 0-2-rnd(2developed three implementations of square matrices B=rnd(2): Bl, B2, B3, complex-valued matrix type: C1, C2, C3 and matrix type D: Dl, D2, D3.After Fourier transform in each color channel and the corresponding normalization receive three matrix hologram. is the hologram multiplicitous without joints in Adobe Photoshop 4.0, filling the desired area of the holographic background, produce page layout with prints and print products.The recovery of the latent color image is performed by inputting the image of the impression in the computer when scanning in color, separations, applying the inverse Fourier transform for each color channel and link aggregation.For the implementation of the proposed method is sufficiently desktop publishing with the following hardware and software:computer IBM PC Pentium II-450,128 MB RAM,monitor SyncMaster 700ift,scanner Helwlett Packard ScanJet 5200C,printer Epson Stylus Photo 1200,system of computer mathematics Mathcad 2000 Professional,- image editing program Adobe Photoshop 4.0.
Claims1. A method of manufacturing printed products with a primary and a latent image, which consists in the fact that the hidden image is converted into a digital hologram in the scheme of obtaining the Fourier hologram with the reference point source, and a randomized phase of the subject radiation, receive the image of the hologram and produce printing products, other, and the amount of shift change from print to print.2. The method according to p. 1, characterized in that produce color separations hidden image, calculate holograms for each color in terms of matching coordinates of the reference sources, and different implementations of the randomization phase of the subject radiation and receive the appropriate image.
FIELD: information medium sealed up by the method of metallographic printing, method for its manufacture, as well as a printing plate suitable for the purpose and the method for its manufacture.
SUBSTANCE: the information medium, first of all a bank note, securities or a similar document, which has at least one sealed up section (13) and at least one separate section (14) practically completely encircled by this section. The mentioned section (13) and the separate section (14) are sealed up by the metallographic method, and both sections are sealed up by paint coats of a different thickness and differ from one another.
EFFECT: provided a high degree of protection against forgery of the information medium.
21 cl, 11 dwg