Abstract:
Le procédé comporte : une étape de génération d'une image; une étape de marquage d'une pluralité de documents pour former ladite image sur chaque dit document avec des variations uniques sur chaque document, la majorité des images formées sur lesdits documents présentant une caractéristique anti-copie physique répondant à un critère prédéterminé telle que ladite caractéristique de la majorité des copies pouvant être réalisées à partir de ces images ne répondent pas audit critère prédéterminé; une étape de caractérisation desdites variations pour former une empreinte unique de la marque formée, pour chaque dit document; et une étape de mémorisation de ladite empreinte unique. Dans des modes de réalisation, l'image ne comporte que deux couleurs. Dans des modes de réalisation, au cours de l'étape de caractérisation des variations, on met en œuvre une analyse fréquentielle. Dans des modes de réalisation, au cours de l'étape de mémorisation, on mémorise l'empreinte dans une base de données et/ou on marque le document avec une marque représentative de l'empreinte, apposée individuellement sur le document.
Abstract:
The invention provides methods and apparatus for securing personalized or sensitive information appearing in digital images. Digital images containing information to be secured is processed and divided into a plurality of image cells. At least one image cell from the plurality of image cells is selected and redacted or altered to render the information to be secured with the selected image cells indecipherable. The invention also provides methods and apparatus for redacting information to be secured in a high throughput automated process.
Abstract:
An information-detecting apparatus (1) including a receiving unit (3) operable to receive digital data (2) that includes several pieces of element data, in which a change amount is imparted to a value of each of first and second element data among the several pieces of element data, a first selecting unit (4) operable to select, as target data (6), a data set that includes the first and second element data, a second selecting unit (5) operable to select, as neighboring data (7), element data in proximity to each of the first and second element data, a calculating unit (8) operable to calculate, based on both of the target data (6) and the neighboring data (7), the change amount imparted to each of the first and second element data, and a detecting unit (10) operable to detect the additional information in accordance with the change amount.
Abstract:
An automated method of producing an encoded image for use in authenticating a printed version of a digital document is presented. The method comprises establishing at least one digitized authentication image, receiving at least one user-supplied encoding parameter, and determining at least one non-user-supplied encoding parameter. The method further comprises establishing a first encoding parameter set including the at least one user-supplied encoding parameter and the at least one non-user-supplied encoding parameter. The first encoding parameter set is usable to encode one or more of the at least one digitized authentication image. The method also comprises encoding one or more of the at least one digitized authentication image using the first encoding parameter set to produce a final encoded image.
Abstract:
A computer-implemented method is designed for on-demand printing on digital printers of a coding pattern to code data on a surface. The coding pattern comprises a plurality of parallel number sequences which represent different rotations of a cyclic number sequence. The method could involve retrieving a digital representation of the coding pattern, and identifying the rotations therein to derive shift information which designates a phase difference between each rotation and the cyclic number sequence. In the printing operation, all the different rotations may be represented by the cyclic number sequence embodied as at least one code block image. This code block image is repeated in accordance with the shift information to form a printable image in the printer.
Abstract:
A method and apparatus for providing noise estimation for dithering pattern selection is disclosed. One or more candidate regions are identified from a source. A noise estimation is provided. A dithering pattern is introduced for a selected candidate region based on a magnitude of the noise estimation.
Abstract:
This invention relates to a method and an arrangement for embedding auxiliary data in an information signal. Only a part of a noise signal representing the auxiliary data is embedded but the complete noise signal may be detecting. This allows for a greater payload of the embedded signal. The invention also relates to a corresponding method and arrangement for detecting auxiliary data in an information signal.
Abstract:
A method for data preparation and watermark insertion. The method includes the step of preparing the data at a first time by manipulating at least one set of the data characteristics (306) for subsequent insertion of a first watermark (2). In a preferred embodiment of the method of the present invention the method further includes the step of inserting the first watermark by manipulating the set of data characteristics at a second time subsequent to the first time. In a variation of the present invention a method for inserting a watermark into compressed data is provided. The compressed data has sets of data characteristics. The method includes the steps of inserting a watermark by manipulating the set of data characteristics; and optimizing the manipulated data by modifying the compressed data characteristics subject to a set of constraints (308, 310).
Abstract:
Machine readable data is digitally watermarked into banknotes (16). Such watermarking can be optically sensed (13) and detected by various devices (11). In response, such devices (11) can intervene to prevent banknote reproduction. This arrangement addresses various problems, e.g., the use of digital image editing tools to circumvent other banknote anti-copy systems.