A first pattern and the second pattern in an original include relatively lighter markings within a relatively darker background. The first pattern differs from the second pattern by including non-printing patches between the relatively lighter markings. When the original is exposed to ultraviolet light, the underlying print media fluoresces in response to the ultraviolet light at the non-printing patches, revealing hidden security printing features. When a scanned image is printed on a second sheet of print media to produce a copy of the original, the copy lacks distinct markings at locations where the relatively lighter markings and the non-printing patches appear in the original because the spacing interval of the relatively lighter markings and the non-printing patches is below the minimum resolution of the scanner. Thus, when the copy is exposed to ultraviolet light, the copy does not fluoresce the ultraviolet light where the non-printing patches appear in the original.

An information processing apparatus includes a setting unit, a detector and a controller. The setting unit sets setting information associating a registered image obtained by reading an image with control information indicating whether input image data is to be stored or not. The detector detects the registered image from the input image data. The controller controls whether or not the input image data including the registered image is stored in a storage based on the setting information.

An original document is formed using a first print medium by printing a first and second monochrome patterns with a single colorant to form printed first and second regions including first and second shapes, respectively, which are devoid of the colorant. The second shapes have a smaller size and a higher frequency than the first shapes. The first and/or second regions encode information. The first and second patterns and a fluorescence of the first print medium are selected such that the first and second regions of the original document are indistinguishable to the naked eye, under both normal and ultraviolet illumination but are distinguishable, only under the ultraviolet illumination, in a copy formed by scanning the original document and printing the scanned document on a second print medium with a plurality of colorants, to reveal the encoded information.

Systems and methods applicable, for instance, to the generation and usage of authentication images. In one aspect, unauthorized attempts to duplicate authentication images can be thwarted. In another aspect, there can be provision for authorized authentication image generation using low-resolution print devices.

An original document is formed using a first print medium by printing a first and second monochrome patterns with a single colorant to form printed first and second regions including first and second shapes, respectively, which are devoid of the colorant. The second shapes have a smaller size and a higher frequency than the first shapes. The first and/or second regions encode information. The first and second patterns and a fluorescence of the first print medium are selected such that the first and second regions of the original document are indistinguishable to the naked eye, under both normal and ultraviolet illumination but are distinguishable, only under the ultraviolet illumination, in a copy formed by scanning the original document and printing the scanned document on a second print medium with a plurality of colorants, to reveal the encoded information.

A copy-evident document and a method of printing a copy-evident document wherein a void pantograph is created including a first set of halftone elements and a second set of halftone elements different in modulation from the first set of halftone elements. An overlay including a white image with a plurality of halftone hole locations is preferably formed, wherein the halftone elements of the void pantograph are converted to the plurality of halftone hole locations. The overlay is then preferably merged with a background image, such that portions of the background image are visible at the halftone hole locations of the overlay when printed. The merged image is then printed on print media, wherein the portions of the background image that are printed are printed at locations where the holes locations are present in the overlay creating a copy-evident feature.

To generate a security mark, a system prints test pattern marks of varying frequencies on a first substrate. The system copies the test pattern marks onto a second substrate. The system analyzes the copy to identify a frequency or period range for test patterns that exhibit a high level of contrast as compared to the original. It then uses the identified range to generate an array of cells having pantograph marks of various foreground/background frequencies/periods. The system prints the array and generates polygons that contain cells in which the foreground is visually distinguished from the background. The system identifies the polygon having an inner point having a largest range to edge. It identifies the frequency/period of the background pattern and of the foreground pattern of the cell that contains the inner point. It then generates a pantograph mark having a background and foreground that correspond the identified frequencies or periods.

Methods and systems for rendering a gloss mark on a recording medium. Two or more sets of toner channels can be electronically created wherein each toner channel include respective sides and a bottom. The two or more sets of toner channels can be electronically configured to include a reflectance off the sides and the bottom of toner channels wherein one set of the toner channels is positioned at a different height and a different color than the other set of toner channels, thereby enhancing the gloss effect associated with a gloss mark, which allows the gloss mark to be effectively utilized in, for example, a printer or printing system such as an office class rendering device.

Method of generating a copy detection pattern (CDP), or a portion of a CDP, for printing on a substrate, comprising: generating a plurality of digital files, each of an image comprising an at least partially random two dimensional (2D) distribution of dark and light pixels, and applying an optimization process configured to increase a copy detection performance of a resultant digital file output by the method, said optimization process comprising a) comparing a copy detection performance of a first of said plurality of digital files, which constitutes a test digital file, with a copy detection performance of another of said plurality of digital files modified with respect to said test digital file, which constitutes a modified digital file, b) replacing the test digital file with said modified digital file, if the copy detection performance of said modified digital file is greater than the copy detection performance of the test digital file, in which case the modified digital file becomes the test digital file, and c) repeating steps a) and b) until a termination condition is met.

A copy-evident document and a method of printing a copy-evident document wherein a void pantograph is created including a first set of halftone elements and a second set of halftone elements different in modulation from the first set of halftone elements. An overlay including a white image with a plurality of halftone hole locations is preferably formed, wherein the halftone elements of the void pantograph are converted to the plurality of halftone hole locations. The overlay is then preferably merged with a background image, such that portions of the background image are visible at the halftone hole locations of the overlay when printed. The merged image is then printed on print media, wherein the portions of the background image that are printed are printed at locations where the holes locations are present in the overlay creating a copy-evident feature.