Abstract: Circumscribing rectangles of respective characters in a document image are obtained. In a first pair as a pair of a first circumscribing rectangle in a first line (a line of A1 to A7) serving as a reference line, and a second circumscribing rectangle in a second line (a line of B1 to B4 or C1 to C7) as one of lines other than the reference line, and a second pair as a pair of a third circumscribing rectangle in the first line, and a fourth circumscribing rectangle in the second line, of these circumscribing rectangles, at least one of the circumscribing rectangles included in these pairs is controlled to vary the distance between the circumscribing rectangles of the first pair, and the distance between the circumscribing rectangles of the second pair in accordance with digital watermark information to be embedded, thereby embedding the digital watermark information.

Abstract: Distance d1 between the right edges of A1 and B2, and distance d2 between the right edges of A3 and B4 are calculated. If data to be embedded is 1, one or a combination of a process for increasing the size of B2 in the column direction or decreasing the size of B4 in the column and a process for moving the position of B2 toward B3 or moving the position of B4 toward B3 is executed to meet d1>d2. If data to be embedded is 0, one or a combination of a process for decreasing the size of B2 in the column direction or increasing the size of B4 in the column direction, and a process for moving the position of B2 toward B1 or moving the position of B4 toward B5 is executed to meet d1<d2.

Abstract: An object of the present invention is to efficiently embed digital-watermark information in a document image by adjusting robustness and quality of the image. In order to achieve the object, watermark information and image information are input, a first parameter determining embedding strength and a second parameter determining image quality are set, and the digital-watermark information is embedded in the image based on the first and second parameters. When the entire information cannot be embedded, the first or second parameter is adjusted so as to embed a larger amount of digital-watermark information in the image.

Abstract: A method for embedding a digital watermark includes a step of inputting digital watermark information; a step of inputting an image; a step of dividing the image into a plurality of areas; a step of ordering the plurality of areas according to a predetermined ordering criterion; a step of embedding the digital watermark information over the plurality of areas that have been ordered; and a step of outputting an image with the digital watermark information embedded therein.

Abstract: The present invention provides a user with a user interface that is convenient and easy to use. In a case where authentication data in an image file is MAC data, data related to the image file is displayed in the first window 301 (S206). In a case where the authentication data in the image file is digital signature data, data related to the image file is displayed in the second window 301 (S211).

Abstract: A document image undergoes document analysis to obtain circumscribing rectangles of characters (S601), and two distances between non-neighboring circumscribing rectangles from the head of the document are respectively calculated as d1 and d2 (S603). If information to be embedded is 1, one or a combination of a process for changing a parameter associated with the size of a circumscribing rectangle and a process for changing a parameter associated with the position of a circumscribing rectangle is executed to satisfy d1>d2 (S605). If information to be embedded is 0, one or a combination of the above two parameter change processes is executed to satisfy d1<d2 (S606).

Abstract: It is required to protect the copyrights and the like of partial images which form respective parts of an image obtained by reading an image, exchanged using a print as a medium, by an image scanner or the like. Input image data is divided into a plurality of image regions having different features, digital watermarks, which are embedded in the detected image regions by embedding methods corresponding to the features of the image regions, are extracted, and the availability of the input image is checked on the basis of the extracted digital watermarks.

Abstract: Disclosed are a watermark information extraction apparatus and method of controlling thereof having an extraction accuracy equal to or greater than that of the conventional technique, which performs extraction using an original image, without requiring use of an original image when extracting watermark information that has been embedded in an image by a digital watermark. A verification image (100) in which watermark information has been embedded by a digital watermark is input from an input unit (101). Character information concerning a prescribed character included in the verification image (100) is acquired by a recognition processor (102) utilizing a recognition dictionary (103). On the basis of the character information acquired, an original image (105) that prevailed prior to the embedding of watermark information is reconstructed by a original image reconstruction unit (104).