ID card, ID card issuing device, and ID card reading device
First Claim
1. An ID card with an embedded image recorded therein by means of printing, wherein the embedded image has first ID information for identifying a person embedded therein as a digital watermark, the embedded image being obtained by assuming a watermark image including the first ID information as an image located in a certain frequency domain, making the whole watermark image subjected to an inverse transform from the frequency domain to generate a transformed image, and adding the transformed image to a photographic image that represents part or whole of the person.
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Abstract
The technique of the present invention assumes a watermark image including ID information as an image located in a frequency domain and makes the whole watermark image subjected to an inverse transform from the frequency domain to generate a transformed image. The technique subsequently adds the transformed image to a photographic image to obtain an embedded image with the ID information embedded therein as a digital watermark. The technique then records the embedded image in a predetermined card by means of printing, so as to issue an ID card. This arrangement enables easy detection of any illegal alteration of the ID card, for example, falsification of the photographic image.
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Citations
16 Claims
- 1. An ID card with an embedded image recorded therein by means of printing, wherein the embedded image has first ID information for identifying a person embedded therein as a digital watermark, the embedded image being obtained by assuming a watermark image including the first ID information as an image located in a certain frequency domain, making the whole watermark image subjected to an inverse transform from the frequency domain to generate a transformed image, and adding the transformed image to a photographic image that represents part or whole of the person.
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3. An ID card issuing device that issues an ID card, said ID card issuing device comprising:
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an inverse transform module that assumes a watermark image including ID information for identifying a person as an image located in a certain frequency domain, and makes the whole watermark image subjected to an inverse transform from the frequency domain, so as to generate a transformed image;
an adder that adds the transformed image to a photographic image representing part or whole of the person, so as to obtain an embedded image with the ID information embedded therein as a digital watermark; and
a recording module that records the embedded image in a predetermined card by means of printing, so as to issue said ID card.
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4. An ID card reading device that reads information recorded in the ID card, said ID card reading device comprising:
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a reading module that reads an embedded image, which is recorded in said ID card and includes a photographic image representing part or whole of a person and ID information for identifying the person embedded in the photographic image as a digital watermark;
a transform module that makes the whole embedded image subjected to a transform into a frequency domain, so as to generate a transformed image; and
an extraction module that extracts the ID information from the transformed image.
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5. A method of issuing an ID card, said ID card issuing method comprising the steps of:
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(a) providing ID information for specifying a person and a photographic image that represents part or whole of the person;
(b) defining the ID information as a graphic and arranging the graphical ID information at a desired position to generate a watermark image;
(c) assuming the watermark image as an image located in a frequency domain and making the whole watermark image subjected to an inverse transform from the frequency domain, so as to generate a transformed image;
(d) adding the transformed image to the photographic image, so as to obtain an embedded image with the ID information embedded therein as a digital watermark; and
(e) recording the embedded image in a predetermined card by means of printing, so as to issue said ID card. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method of reading information recorded in an ID card, said ID card reading method comprising the steps of:
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(a) providing said ID card with an embedded image recorded therein, where the embedded image has ID information for identifying a person embedded as a digital watermark in a photographic image representing part or whole of the person;
(b) reading the embedded image from said ID card;
(c) making the whole embedded image subjected to a transform into a frequency domain, so as to generate a transformed image; and
(d) extracting the ID information from the transformed image. - View Dependent Claims (12, 13, 14)
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15. A computer readable recording medium in which a computer program for issuing an ID card is recorded, said computer program causing a computer to attain the functions of:
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defining ID information for identifying a person as a graphic and arranging the graphical ID information at a desired position to generate a watermark image;
assuming the watermark image as an image located in a frequency domain and making the whole watermark image subjected to an inverse transform from the frequency domain, so as to generate a transformed image; and
adding the transformed image to a photographic image, which represents part or whole of the person, so as to obtain an embedded image, which is to be recorded in said ID card.
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16. A computer readable recording medium in which a computer program for reading information recorded in an ID card is recorded, said computer program causing a computer to attain the functions of:
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making a whole embedded image, which has ID information for identifying a person embedded therein as a digital watermark and is read from said ID card, subjected to a transform into a frequency domain, so as to generate a transformed image; and
extracting the ID information from the transformed image.
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Specification