Image encrypting method and device, image decrypting method and device, and recording medium
First Claim
1. An image encrypting method comprising the steps of:
- decomposing original image data into a plurality of components;
encrypting a plurality of desired components from among said components;
preparing encrypting information representing the contents of the encryption;
generating an encrypted image file from said encrypted components which have been encrypted, and non-encrypted components which have not been encrypted; and
attaching said encrypting information to the encrypted image file;
wherein said components are any of;
resolution image data obtained by decomposing said original image data into a plurality of resolutions;
luminance image data and chromaticity information data of said original image data;
frequency data representing the spatial frequency components of said original image data.
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Accused Products
Abstract
When image data has been decomposed into a plurality of components, and a plurality of components of the components have been encrypted, the encrypted image file must be able to be used without confusion. On a component decomposing apparatus, image data is decomposed into a plurality of components for the hierarchical levels, for example. On an encrypting apparatus, a plurality of components of the components are encrypted. And, on an encrypting information preparing means, encrypting information H concerning the contents of this encryption is prepared, and from the encrypted components and the non-encrypted components, and the encrypting information H, an encrypted image file F is generated on an encrypted image file generating apparatus. When the encrypted image file F is to be decrypted, the encryption contents of the encrypted components can easily be grasped by referring to the encrypting information H.
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Citations
16 Claims
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1. An image encrypting method comprising the steps of:
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decomposing original image data into a plurality of components;
encrypting a plurality of desired components from among said components;
preparing encrypting information representing the contents of the encryption;
generating an encrypted image file from said encrypted components which have been encrypted, and non-encrypted components which have not been encrypted; and
attaching said encrypting information to the encrypted image file;
wherein said components are any of;
resolution image data obtained by decomposing said original image data into a plurality of resolutions;
luminance image data and chromaticity information data of said original image data;
frequency data representing the spatial frequency components of said original image data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
information that indicates that encryption has been performed;
encryption system information;
encryption key information;
image component information of the original image which has been encrypted;
copyright information of the original image; and
information of a decrypting means that can decrypt said encrypted components.
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4. An image decrypting method that decrypts an encrypted image file which has been obtained by the image encryption method according to claim 1, comprising the steps of:
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reading out said encrypting information from said encrypted image file; and
performing decryption of said encrypted components based on said encrypting information.
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5. An image decrypting method that decrypts an encrypted image file which has been obtained by the image encrypting method according to claim 1, comprising the steps of:
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reading out said encrypting information from said encrypted image file;
determining the decrypting means that can decrypt said encrypted components based on said encrypting information; and
transferring said encrypted image file to the determined decrypting means.
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6. A computer readable recording medium that records a program to cause a computer to execute a procedure for decrypting an encrypted image file obtained by the photographic image encryption method according to claim 1, wherein said program comprises:
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a procedure for reading out said encrypting information from said encrypted image file; and
a procedure for decrypting said encrypted components based on said encrypting information.
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7. A computer readable recording medium that records a program to cause a computer to execute a procedure for decrypting an encrypted image file obtained by the photographic image encryption method according to claim 1, wherein said program comprises:
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a procedure for reading out said encrypting information from said encrypted image file;
a determining means that determines the decrypting means that can decrypt said encrypted components based on said encrypting information; and
a transferring means that transfers said encrypted image file to the determined decrypting means.
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8. An image encrypting method according to claim 1 wherein said components may further comprise regional data.
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9. An image encrypting apparatus comprising:
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a component decomposing means that decomposes original image data into a plurality of components;
an encrypting means that encrypts a plurality of desired components from among said components;
an encrypting information preparing means that prepares encrypting information representing the contents of the encryption;
an encrypted file generating means that generates an encrypted image file from said encrypted components which have been encrypted, and non-encrypted components which have not been encrypted; and
an attaching means that attaches said encrypting information to the encrypted image file;
whereinsaid components are any of; resolution image data obtained by decomposing said original image data into a plurality of resolutions;
luminance image data and chromaticity information data of said original image data;
frequency data representing the spatial frequency components of said original image data. - View Dependent Claims (10, 11, 12, 13)
an encrypting information reading means that reads out said encrypting information from said encrypting image file; and
a decrypting means that performs decryption of said encrypted components based on said encrypting information.
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12. An image decrypting apparatus that decrypts an encrypted image file which has been obtained with the photographic image encrypting apparatus according to claim 9, comprising:
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an encrypting information reading means that reads out said encrypting information from said encrypted image file;
a determining means that determines the decrypting means that can decrypt said encrypted components based on said encrypting information; and
a transferring means that transfers said encrypted image file to the determined decrypting means.
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13. An image encrypting apparatus according to claim 9 wherein said components may further comprise regional data.
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14. A computer readable recording medium that records a program to cause a computer to execute:
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a procedure for decomposing original image data into a plurality of components;
a procedure for encrypting a plurality of desired components from among said components;
a procedure for preparing encrypting information representing the contents of the encryption;
a procedure for generating an encrypted image file from said encrypted components which have been encrypted, and non-encrypted components which have not been encrypted; and
a procedure for attaching said encrypting information to the encrypted image file;
whereinsaid components are any of; resolution image data obtained by decomposing said original image data into a plurality of resolutions;
luminance image data and chromaticity information data of said original image data;
frequency data representing the spatial frequency components of said original image data. - View Dependent Claims (15, 16)
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Specification