BG110837A - A protective perforation and method for protecting products against forgery by perforation - Google Patents

Abstract

The invention is related to high resolution perforation with colour nuances, and a method for protecting, checking, and certification of the product authenticity, and at that, the perforation is applied with same size holes, which are at equal distances from each other, and the form of the holes is different for the various colour nuances.

Description

TECHNICAL FIELD

The invention relates to security perforation is high resolution and color shades and a method of protecting, verifying and authenticating products.

BACKGROUND OF THE INVENTION

Methods and means for laser perforation to protect documents, means of payment and others against counterfeiting are known.

Document WO9718092A1 shows a method of perforating an image by means of apertures of such a size that the image is visible in transmitted and invisible light, and US2006006236A1 describes a method in which the perforations of the apertures are elliptical cross-shaped to achieve different images. viewing, but do not describe a method for achieving high resolution perforated images and color shades.

EP0936975B1 discloses a method for achieving color shades

by means of round holes of different diameters depending on the level of gray. The disadvantage of this method is the inability to achieve high resolution - a large number of perforated openings over a short distance - of the perforated image on a relatively small surface, because in this case the distance between the perforated openings will be small and because of their different size, this can lead to overlapping openings, which in turn may impair the quality of the resulting image. It is also possible to damage the perforated surface by accumulating large quantities of large diameter perforated openings due to their overlapping and further burning of the material as a result.

On the other hand, none of the methods affect the achievement of high-quality high-resolution (resolution) images in the perforation of a plain black-and-white image without light and color shades.

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SUMMARY OF THE INVENTION

The problems described above are solved by the proposed perforation and image perforation method, in which the perforation has apertures of the same fixed size and distance between them. Thus, within a fixed size, a wide variety of color shades is achieved and an extremely good visual perception of the perforated image.

On the other hand, it is possible to obtain a high density of the perforated openings, i.e. higher image resolution.

Let's consider laser micro perforation with holes with different diameters depending on the level of gray, the openings having diameters between 80 and more than 200 pm depending on the gray light shade. In this case, if we want to get a high resolution image with a small perforation area and have to perform the perforation at a distance between the centers of apertures of 200 µm, then we will have an overlap of the openings, which will result in poor image quality from one on the other hand, and to the violation of the structure of the protected object. The latter can lead to its rupture and destruction during the perforation or its subsequent use.

The perforation and method proposed in the present invention do not depend on this problem, because the perforation itself is the same size of holes and spacing

between them and allows for high density and resolution.

In most cases, security perforation is the perforation of a particular image, such as a photo of the holder of an identity document, logo, emblem, number, or other type of image. The images in question have some digital form - acquired through scanning, capturing or other form of digitization. The digital form of the image is a collection of color descriptions of the elements (pixels) of the corresponding image, which may vary in quantity depending on the type of image itself. For example, 256 shades of gray for so-called gray-scale images or 65536 colors, respectively, for shades of color, and in some cases only two for black and white for so-called monochromatic images.

In the presence of a gray-scale image or one with a large number of color or color shades. The corresponding levels of color shades are represented by apertures • · · · · · · · · · · · · · · · · ·

of different shape and size (diameter, sides, etc.). At the appropriate level, a specific perforated hole of a certain shape is compared.

The shape of the openings shall be set in such a way that it is up or down, depending on the color shade, respectively the color shade.

As for gray level 0 at 255 shades of gray for gray-scale image, a single-fill figure is compared, for level 1 with a larger fill than the previous one, and so in increasing form up to 255, with the corresponding openings remaining throughout no smaller and no larger - a fixed size that does not change for the entire perforated image. On the other hand, the distance between the openings is also constant and does not change.

In the presence of pure black and white (monochromatic) image, we have only one color shade. To get high-quality, high-resolution images, the corresponding color shade is presented as an opening of the same shape and size. Accordingly, white or black, respectively, are presented as a perforated hole of uniform shape (occupancy) and size. The perforation is carried out in a perforation grid with the same distance of the openings - the same distance between the centers of the openings.

In this way, high-resolution perforated images and image quality of image perception can be achieved, as well as

passed in the reflected light.

The high-resolution and high-quality perforated images thus obtained serve as a unique safeguard against counterfeiting of a wide range of documents such as passports, identity cards, driving licenses, access passes, visa sticker and other documents, as well as means of payment - banknotes, checks or labels of goods, excise labels and more.

Perforation may be the number of the protected object, the image of the document holder or another image - logo, coat of arms and / or other image for protection against counterfeiting. The forgery of the perforated document by this method is hampered by the high quality of the image, leading to clear recognition. Take, for example, the case of protection of identity documents, where the image of the holder of the document is perforated. Because of its high resolution and quality, one can unambiguously judge the document holder and its authenticity, even when trying to forge a photo on the document. On the other hand, the high density of perforations according to the present invention gives the · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

the possibility of embedding in smaller areas, which further complicates its tampering.

The perforation of the images is accomplished by means of mechanical, laser, ion or other perforation - cutting of openings. A preferred embodiment is laser perforation and micro perforation, where extremely high resolution and quality of the perforated image are achieved for different groups of materials depending on the wavelength. For different types of paper and plastics, a wavelength of 16000 nm is used, and for metal a wavelength of 1064 ps, as well as other wavelengths depending on the material.

EXPLANATION OF THE FIGURES Attached

FIG. 1 - presents perforation of an image by openings of the same size and shape and the same distance between them.

FIG. 2 - presents the perforation of an image through openings of the same size and distance between them, the openings having a different rounded shape depending on the shade of gray.

FIG. 3 - represents the perforation of an image by means of apertures equal in size and distance between them, the apertures having a different non-curved shape depending on the shade of gray.

FIG. 4 - presents the perforation of an image by openings of the same size and shape and the distance between them, the image being converted to black and white.

EXAMPLES FOR THE IMPLEMENTATION OF THE INVENTION

An exemplary embodiment of the invention is shown in FIG. 1, wherein the output black-and-white (monochromatic) image (1.1) is transformed to the perforation resolution by increasing or decreasing its size. The image thus obtained (1.1) is perforated by openings of the same size spaced at a predefined distance. Depending on the preference for the visual effect, only the shade of white (1.2) or only the shade of black (1.3) is perforated. In the first case, we get a negative image that has a better visual perception of the passing light than reflected light, and in the second case we achieve a positive image that has a better visual perception of the reflected light than the passing light.

The same applies if we have a color image, which we convert to black and white, and perforate the method described above.

Another embodiment showing a gray-scale image with 256 shades of gray is shown in FIG. 2, where, depending on the color shade (2.1), an aperture of corresponding shape (2.2) is perforated, and a group of color shades is perforated with apertures of the same shape (2.2) to obtain the perforated image (2.3) for protection on the passport (2.4).

The same effect is obtained in another embodiment of the invention according to FIG. 3, where image (3.1) is a 16-bit color (65536) converted to gray-scale with 256 shades of gray (3.3), using standard image processing technique - in this case (H-red + 3-green + C-blue) / 3 ((R + G + B) / 3). The resulting image (3.2) is perforated by openings of different shapes depending on the shade of gray (3.3) to obtain an image (3.4) from an identity card (3.5).

Another embodiment is shown in FIG. 4, where a color image (4.1) produces any black-and-white image by any classical method of obtaining a halftone image - in this case Floyd-Steinberg, which is perforated by openings of the same size spaced at a predetermined distance and depending on From the visual effect preferences, only the white shade (4.2) or only the black shade (4.3) is perforated to provide counterfeiting.

As mentioned above, to achieve a halftone image other methods, such as Jarvis, Stucki, Cardinality-Distribution, etc., which are not the subject of this invention, may be used to produce a black and white image, which perforate with holes of equal size spaced at the same distance in the perforation matrix to obtain high resolution and quality perforations such as (2.3) and (3.4) for passport protection (2.4) or identity card (3.5) ).

Claims (10)

1. Perforation of an image for protection against counterfeiting of products, characterized in that the perforation has openings of the same size and distance between them, the perforated openings being figures of different shapes to achieve color shades. 2. Perforation of an image for protection against counterfeiting of products, characterized in that the perforation has openings spaced at the same distance from one another and of the same size and shape to achieve a single color shade. 3. Perforation of an anti-counterfeiting image of products according to claims 1 and / or 2, characterized in that the perforation is used to protect anti-counterfeiting documents. 4. Perforation of an image for protection against counterfeiting of products according to any one of the preceding claims, characterized in that the document is a passport, identity card, banknote, check, driver's license, access pass, visa sticker, label, packaging sheet, excise tax stamp or other document. 5. Perforation of an image for protection against counterfeiting of products according to any of the preceding claims, characterized in that the perforation is a number, image of the holder of the document, logo, emblem and / or other image. Image perforation for anti-counterfeiting of products according to claims 1-4, characterized in that the perforation is laser, mechanical, ionic or other type of perforation. 7. A method of protecting against counterfeiting of products by image perforation according to claims 1, 3, 4-6, characterized in that the holes of the same size and the distance between them are perforated, and, depending on the color shades, the holes are punched with different shape. 8. A method of protecting against counterfeiting of products by image perforation according to claims 2-6, characterized in that the apertures of the same size and uniform shape are perforated to achieve a single color shade. Method according to Claims 7 and 8, characterized in that the passport, identity card, banknote, check, driver's license, access pass, visa sticker, label, packing slip, excise label and other documents are perforated. A method according to claims 7 - 9, characterized in that the perforation is carried out by laser, mechanical or other perforation.