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US 2003/0228016 A1Published application
Image encryption apparatus, image encryption method, decryption apparatus, decryption method, program, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorTakuya Shimada
Life of this patent
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Abstract
In step S904, color signals which form input image data are converted into device-independent color signals (color signals X, Y, and Z) using an input profile. In step S905, the color signals X, Y, and Z are converted into color signals Re, Ge, and Be that form encrypted image data using an encryption profile.
Claims35
An image encryption apparatus for encrypting an image, comprising:
- first conversion means for converting a color signal group that forms a first image into a color signal group, that is independent of a device supplying the first image, on the basis of a first profile;
- and
- second conversion means for converting the color signal group, converted by said first conversion means into a color signal group that forms a second image different from the first image, on the basis of a second profile used for encryption which is different from encryption by the first profile.
An image encryption method for encrypting an image, comprising:
- a first conversion step of converting a color signal group that forms a first image into a color signal group, that is independent of a device supplying the first image, on the basis of a first profile;
- and
- a second conversion step of converting the color signal group, converted in the first conversion step into a color signal group that forms a second image different from the first image, on the basis of a second profile used for encryption which is different from encryption by the first profile.
An image encryption apparatus for encrypting an image, comprising:
- first conversion means for converting a color signal group that forms a first image into a first color signal group, which is independent of a device, on the basis of a first profile;
- second conversion means for converting the first color signal group into a color signal group on a color space of an image forming apparatus on the basis of a second profile which is different from the first profile;
- third conversion means for converting the color signal group converted by said second conversion means into a second color signal group on the basis of a third profile, which is used for encryption which is different from encryption by the first and the second profiles;
- and
- fourth conversion means for converting the second color signal group into a color signal group that forms a second image by executing inverse conversion of the conversion by said first conversion means on the basis of the first profile.
2 more elements
An image encryption method for encrypting an image, comprising:
- a first conversion step of converting a color signal group that forms a first image into a first color signal group, which is independent of a device, on the basis of a first profile;
- a second conversion step of converting the first color signal group into a color signal group on a color space of an image forming apparatus on the basis of a second profile which is different from the first profile;
- a third conversion step of converting the color signal group converted in the second conversion step into a second color signal group on the basis of a third profile, which is used for encryption which is different from encryption by the first and the second profiles;
- and
- a fourth conversion step of converting the second color signal group into a color signal group that forms a second image by executing inverse conversion of the conversion in the first conversion step on the basis of the first profile.
2 more elements
An image encryption apparatus for encrypting an image, comprising:
- first conversion means for converting a color signal group that forms a first image into a color signal group on a color space of an image forming apparatus on the basis of a first profile;
- and
- second conversion means for converting the color signal group converted by said first conversion means into a color signal group that forms a second image different from the first image, on the basis of a second profile which is used for encryption which is different from encryption by the first profile.
An image encryption method for encrypting an image, comprising:
- a first conversion step of converting a color signal group that forms a first image into a color signal group on a color space of an image forming apparatus on the basis of a first profile;
- and
- a second conversion step of converting the color signal group converted in the first conversion step into a color signal group that forms a second image different from the first image, on the basis of a second profile which is used for encryption which is different from encryption by the first profile.
Dependencies are inferred from the claim text.