摘要:
Examples herein disclose receiving and identifier associated with a first void pantograph and identifying a second void pantograph based on the received identifier. The examples facilitate authentication of the first void pantograph by making available the second void pantograph.
摘要:
A reading device reads ambiguous target elements of an authentication target printed on a medium. Each ambiguous target element has a number of different manners by which the ambiguous target element can be interpreted by the reading device. The authentication target as read by the reading device is compared against an authentication signature of the reading device. The authentication signature specifies for each ambiguous target element an expected manner by which the reading device interprets the ambiguous target element as one of the different manners by which the ambiguous target element can be interpreted. Where the authentication target as read by the reading device matches the authentication signature of the reading device, the reading device is signaled as having passed authentication.
摘要:
A system can comprise a memory to store machine readable instructions and a processing unit to access the memory and execute the machine readable instructions. The machine readable instructions can comprise a feature set extractor to extract a feature set from each of a plurality of digital images of print samples. The feature set can be a filtered feature set that includes a feature set characterizing a printer that printed a given print sample of the print samples. The machine readable instructions can also comprise a cluster component to determine clusters of the print samples based on the feature set of each of the plurality of scanned images of the print samples. The machine readable instructions can further comprise a printer identifier to identify the printer of the print samples based on the clusters of the print samples.
摘要:
A color target is disclosed. The color target comprises a plurality of marks or features. Each of the plurality of marks can be one of a plurality of colors. Each of the plurality of colors has a corresponding grayscale value that is spaced apart by a predetermined amount.
摘要:
Method for security printing. A digital model of a feature for printing is received, wherein the feature is for authentication by an external device. Deviation from the digital model is compensated for, to a printed instance of the feature.
摘要:
A counterfeit identification performance attribute (CIPA) sensitivity to changes in resolution of the image for features of an image is determined (102). The CIPA sensitivity for the features is used to choose at least one feature to determine whether the image on a sample is a counterfeit (106).
摘要:
A method and system for determining void pantograph settings is presented. The method includes obtaining electronic images of one or more predefined test sheets having a plurality of void pantograph settings, modeling one or more regions of the electronic images, predicting the sensitivity of the plurality of void pantograph settings to a print/scan process, the predicting being based at least in part on the one or modeled regions, and identifying characteristics for a candidate void pantograph setting using the prediction step results. The system includes a controller, a modeling unit, a measuring unit and a prediction unit configured to perform a method in accordance with an embodiment of the invention. A computer readable medium containing executable instructions is also described.
摘要:
A system can comprise a memory to store machine readable instructions and a processing unit to access the memory and execute the machine readable instructions. The machine readable instructions can comprise a feature set extractor to extract a feature set from each of a plurality of digital images of print samples. The feature set can be a filtered feature set that includes a feature set characterizing a printer that printed a given print sample of the print samples. The machine readable instructions can also comprise a cluster component to determine clusters of the print samples based on the feature set of each of the plurality of scanned images of the print samples. The machine readable instructions can further comprise a printer identifier to identify the printer of the print samples based on the clusters of the print samples.
摘要:
A void pantograph and a method for generating the same are disclosed herein. The void pantograph includes a foreground portion based on a region of an image that is defined using a predetermined filter, and a background portion based on another region of the image that is defined using the predetermined filter.
摘要:
A method and system for generating a document having a void pantograph highlight pattern is presented. The method includes computing a score for a void pantograph highlight pattern layer in relation to a document formatted content layer, incrementing a relative position of the void pantograph highlight pattern layer and the document formatted content layer, repeating the computing and the incrementing steps to obtain a plurality of scores at a plurality of relative positions, evaluating the plurality of scores to determine an optimal alignment, and printing the document using variable-data printing techniques, wherein the printed document has a multi-layer architecture including the document formatted content layer and the void pantograph highlight pattern layer. The system includes a control processor, a score computation unit and an evaluation unit. The control processor provides a printer with data containing a multi-layer architecture document having a document formatted content and a void pantograph highlight pattern.