Abstract: In an image processing device adapted to restore sub-information from composite image information produced by a composite image producing device which embeds invisible sub-information into visible main image information to produce the composite image information, the frequency components of the sub-information extracted for each of its color components are smoothed, and the optimum one is selected from among the results of the smoothing process performed for each color component of the sub-information.

Abstract: On a recording medium serving as a verification object, a picture whose state changes in accordance with optical conditions is formed. A verification apparatus images a plurality of pictures of the recording medium while changing an optical relationship among a light source for illuminating the recording medium, a camera for imaging a picture of the recording medium, and the recording medium with a condition modifying unit. The verification apparatus displays the plurality of pictures of the recording medium imaged by the camera, on the display unit in a state in which the optical relationship has been changed. The verification apparatus determines imaging conditions for imaging a picture for verification on the basis of the optical relationship at the time of photographing selected pictures among the plurality of pictures displayed on the display unit.

Abstract: An image processing apparatus determines an embedding method for embedding sub information into a main image to be printed on a recording layer based on the degree of optical shielding of a protection layer or a security layer formed on the surface of the recording layer, on which an image is to be printed, with respect to the surface of the recording layer in a recording medium, and generates a composite image obtained by embedding the sub information into the main image by the determined embedding method as the image to be printed on the recording layer of the recording medium.

Abstract: An image processing apparatus corrects color-difference amounts of main image information by a plurality of color-difference amount correction processes and performs a plurality of color-difference modulation processes based on the processing results of the plurality of color-difference amount correction processes and a plurality of key information items. Further, it subjects the processing results of the plurality of color-difference modulation processes to the selecting/synthesizing process based on sub-information and superposing the processing result of the selecting/synthesizing process on the main image information to form synthesized image information having sub-information embedded in an invisible state in the main image information.

Abstract: On a recording medium serving as a verification object, a picture whose state changes in accordance with optical conditions is formed. A verification apparatus images a plurality of pictures of the recording medium while changing an optical relationship among a light source for illuminating the recording medium, a camera for imaging a picture of the recording medium, and the recording medium with a condition modifying unit. The verification apparatus displays the plurality of pictures of the recording medium imaged by the camera, on the display unit in a state in which the optical relationship has been changed. The verification apparatus determines imaging conditions for imaging a picture for verification on the basis of the optical relationship at the time of photographing selected pictures among the plurality of pictures displayed on the display unit.

Abstract: In an image processing device adapted to restore sub-information from composite image information produced by a composite image producing device which embeds invisible sub-information into visible main image information to produce the composite image information, the frequency components of the sub-information extracted for each of its color components are smoothed, and the optimum one is selected from among the results of the smoothing process performed for each color component of the sub-information.

Abstract: In a personal authentication medium issuing apparatus, a main image information is input and whether a personal authentication medium on which synthesized image information having sub-information embedded in the main image information is checked or not is determined based on the state of the input main image information. Further, synthesized image information having sub-information embedded in an invisible state in the main image information which is set in a visible state is formed, a personal authentication medium is formed by printing the synthesized image information on a recording medium and the thus formed personal authentication media are sorted into personal authentication media determined to be completely formed and personal authentication media determined to require a checking process.

Abstract: An image processing apparatus determines an embedding method for embedding sub information into a main image to be printed on a recording layer based on the degree of optical shielding of a protection layer or a security layer formed on the surface of the recording layer, on which an image is to be printed, with respect to the surface of the recording layer in a recording medium, and generates a composite image obtained by embedding the sub information into the main image by the determined embedding method as the image to be printed on the recording layer of the recording medium.

Abstract: An image processing apparatus corrects color-difference amounts of main image information by a plurality of color-difference amount correction processes and performs a plurality of color-difference modulation processes based on the processing results of the plurality of color-difference amount correction processes and a plurality of key information items. Further, it subjects the processing results of the plurality of color-difference modulation processes to the selecting/synthesizing process based on sub-information and superposing the processing result of the selecting/synthesizing process on the main image information to form synthesized image information having sub-information embedded in an invisible state in the main image information.

Abstract: In a personal authentication medium issuing apparatus, a main image information is input and whether a personal authentication medium on which synthesized image information having sub-information embedded in the main image information is checked or not is determined based on the state of the input main image information. Further, synthesized image information having sub-information embedded in an invisible state in the main image information which is set in a visible state is formed, a personal authentication medium is formed by printing the synthesized image information on a recording medium and the thus formed personal authentication media are sorted into personal authentication media determined to be completely formed and personal authentication media determined to require a checking process.

Abstract: Composite image information which is generated by embedding invisible sub-information in visible main image information and recorded on a recording medium is read. A spatial frequency component unique to key information used to restore the sub-information is extracted from the composite image information read from the recording medium. The sub-information is reconstructed from the extracted spatial frequency component.

Abstract: Composite image information which is generated by embedding invisible sub-information in visible main image information and recorded on a recording medium is read. A spatial frequency component unique to key information used to restore the sub-information is extracted from the composite image information read from the recording medium. The sub-information is reconstructed from the extracted spatial frequency component.