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Processes to identify a first type of objects among a plurality of a first and a second type of objects, and to determine which, among a plurality of objects, has been marked with a hidden indicator, and, system to identify a first type of objects among a plurality of a first and a second type of objects
Processes to identify a first type of objects among a plurality of a first and a second type of objects, and to determine which, among a plurality of objects, has been marked with a hidden indicator, and, system to identify a first type of objects among a plurality of a first and a second type of objects
"PROCESSES TO IDENTIFY A FIRST TYPE OF OBJECTS BETWEEN A PLURALITY OF A FIRST AND A SECOND TYPE OF OBJECTS, AND TO DETERMINE WHICH, WITHIN A PLURALITY OF OBJECTS, HAS BEEN MARKED WITH A HIDDEN INDICATOR, AND, A SYSTEM FOR IDENTIFYING A FIRST TYPE OF OBJECTIVE WITHIN A PLURALITY OF A FIRST AND A SECOND TYPE OF OBJECTS "A system and process for determining which of a plurality of visually indistinguishable objects (14) has been marked with a hidden indicator (10) on which a portion of a surface (12) of each of a first type of objects (14) is provided with a hidden holographic indicator (10), which is exposed to be seen but which is detectable only when illuminated with a coherent reference light of predetermined wavelength. The surfaces (12) of the objects (14) are scanned with a reference light consistent with the predetermined wavelength, and evaluated to determine whether the scanned surfaces include the hidden holographic indicator (10). The presence of a hidden holographic indicator (10) indicates that the object (14), in which the hidden holographic indicator (10) is detected, is one of the first type of objects. The first type of object can be a winning game ticket, or a genuine one, as opposed to a counterfeit item. the hidden verification fantasy image is described and in other applications there should be no indication of its presence. Holography involves recording and reconstructing interference patterns. Holographic images are used in a variety of applications, including security devices for ID cards, and on packaging and playing cards. For example, US patent 5,037 101, issued on August 6, 1991, to McNulty, describes the use of holographic imaging in a game card. However, the image is not hidden and must be covered with an opaque cover that is removed by scratching, rubbing or pulling. Covering the image is costly and spoils the appearance of the playing card. Similarly, JP 08-216577 describes a removable cover for a hologram on a lottery ticket. Examples of hidden holographic images are found in US patent 3 894 756, issued on July 15, 1975, to Ward, who uses a separate insert formed by a bundle shuffler, US patent 4 140 373, issued on February 20, 1979 , for R³ll, which requires the use of two holographic images, one read only in coherent visible light and the other read only in coherent light outside the visible spectrum, and US patent 4 400 616, issued on August 23, 1983, for Chevillat et al., who uses a waveguide hologram. WO 92 04692A describes a safety device with two diffraction structures (holograms). When lighting with a first visible wavelength, the device generates a first visible pattern and, when lighting with a second different wavelength, the device generates a second pattern. The first wavelength does not generate the second pattern and the second wavelength does not generate the first pattern. The second wavelength is outside the visible spectrum. None of the known references use a hidden hologram to verify the identity of a particular object, which is usually visually indistinguishable from other objects of the same type, such as game cards, promotional products, and easily copied consumer items. For other reasons, embossed holograms can be copied in three ways. Contact copying creates a new fake holographic matrix by using an authentic hologram as a template. The contact copy technique can be used to "harden" the relief in materials such as PVC, OPP, polyester, or to "soften" the relief in a curable resin coating. The "soft" relief technique was particularly
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