Verifiable holographic article
First Claim
Patent Images
1. A verifiable holographic article comprising a substrate comprising (a) at least one hologram;
- and (b) at least one covert image that is convertible to an overt image using a decoding sampling device that produces an aliasing or moiré
effect, wherein said covert image is created by a process comprising the steps of (a) removing any frequency components of an original, overt image that are greater than half the sampling frequency of said decoding sampling device; and
(b) mirroring the remaining frequency components about the axes that correspond to half of said sampling frequency.
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Abstract
A verifiable holographic article comprises a substrate comprising (a) at least one hologram; and (b) at least one covert image that is convertible to an overt image using a decoding sampling device, e.g., a photocopier, that produces an aliasing or moire effect. The article cost-effectively provides both “first line” and “second line” security features and can be easily, quickly, and safely verified or authenticated.
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Citations
19 Claims
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1. A verifiable holographic article comprising a substrate comprising (a) at least one hologram;
- and (b) at least one covert image that is convertible to an overt image using a decoding sampling device that produces an aliasing or moiré
effect, wherein said covert image is created by a process comprising the steps of (a) removing any frequency components of an original, overt image that are greater than half the sampling frequency of said decoding sampling device; and
(b) mirroring the remaining frequency components about the axes that correspond to half of said sampling frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 19)
- and (b) at least one covert image that is convertible to an overt image using a decoding sampling device that produces an aliasing or moiré
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15. A verifiable holographic article comprising a substrate comprising (a) at least one rainbow hologram;
- and (b) at least one covert image that is prepared by a process comprising the steps of (i) determining the Fourier transform of at least a portion of an original, overt image;
(ii) removing all of the frequency components of said Fourier transform that are greater than half of the sampling frequency of a decoding sampling device that is to be used for the decoding of said portion of said image;
(iii) mirroring the remaining frequency components of said Fourier transform about the axes that correspond to half of said sampling frequency; and
(iv) determining the inverse Fourier transform of the resulting mirrored frequency components. - View Dependent Claims (16)
- and (b) at least one covert image that is prepared by a process comprising the steps of (i) determining the Fourier transform of at least a portion of an original, overt image;
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17. A kit comprising (a) a verifiable holographic article comprising a substrate comprising (a) at least one hologram;
- and (b) at least one covert image that is convertible to an overt image using a decoding sampling device that produces an aliasing or moiré
effect, wherein said covert image is created by a process comprising the steps of (a) removing any frequency components of an original, overt image that are greater than half the sampling frequency of said decoding sampling device; and
(b) mirroring the remaining frequency components about the axes that correspond to half of said sampling frequency and (b) a decoding sampling device. - View Dependent Claims (18)
- and (b) at least one covert image that is convertible to an overt image using a decoding sampling device that produces an aliasing or moiré
Specification