The invention relates to an optical security system comprising an optical element with a patterned anisotropic optical property, wherein information is encoded and encrypted in the pattern of the optical element. The system further comprises a patterned polarizer in which the pattern is such that the information stored in the optical element can be decrypted.

An optical device includes an array of lenses and a plurality of first and second segments disposed under the array of lenses. At a first viewing angle, the array of lenses presents a first image for viewing without presenting the second image for viewing, and at a second viewing angle different from the first viewing angle, the array of lenses presents for viewing the second image without presenting the first image for viewing. In some examples, individual ones of the first and second segments can comprise specular reflecting, transparent, diffusely reflecting, and/or diffusely transmissive features. In some examples, individual ones of the first and second segments can comprise transparent and non-transparent regions. Some examples can incorporate more than one region producing an optical effect.

An optical device includes an array of lenses and a plurality of first and second segments disposed under the array of lenses. At a first viewing angle, the array of lenses presents a first image for viewing without presenting the second image for viewing, and at a second viewing angle different from the first viewing angle, the array of lenses presents for viewing the second image without presenting the first image for viewing. In some examples, individual ones of the first and second segments can comprise specular reflecting, transparent, diffusely reflecting, and/or diffusely transmissive features. In some examples, individual ones of the first and second segments can comprise transparent and non-transparent regions. Some examples can incorporate more than one region producing an optical effect.

Aspects described herein may provide detection of a feature of an authorization code image (ACI) incorporated onto a document, thereby allowing for validation of the document. According to some aspects, these and other benefits may be achieved by an instance of a variable protocol that may specify how to generate the ACI to have a particular feature as well as how to detect the particular feature of the ACI. A recipient of the document incorporating the ACI may detect the particular feature of the ACI. If the detected feature matches an expected feature, then the ACI and the document may be determined to be authentic.

Aspects described herein may provide detection of a feature of an authorization code image (ACI) incorporated onto a document, thereby allowing for validation of the document. According to some aspects, these and other benefits may be achieved by an instance of a variable protocol that may specify how to generate the ACI to have a particular feature as well as how to detect the particular feature of the ACI. A recipient of the document incorporating the ACI may detect the particular feature of the ACI. If the detected feature matches an expected feature, then the ACI and the document may be determined to be authentic.

The objective of the present invention is to provide an information recording body, a medium and a printed product having improved design properties. An information recording body provided with a superimposed image including a brilliant layer and a transparent layer formed on the brilliant layer is characterized in that: the brilliant layer is a chromatic color image formed from a brilliant material; the transparent layer is a regular pattern image formed from a transparent starting material; the transparent starting material is configured in such a way that an amount of light reflected therefrom differs depending on an observation angle; and the superimposed image is formed in such a way that the transparent layer is recognizable in accordance with a specific observation angle.

A visual-information security system that includes an information security label positioned to conceal visual information on a substrate. The information security label may include a spiral-shaped cut (or other complex shape) within the body of the label and a pull-tab, such that when a user pulls on the tab, the label peels off of the substrate in a spiral pattern, revealing the information concealed beneath the label. The complex-shaped cut makes reapplication of the label difficult and evident, thus providing security to consumers. The label may include multiple layers of material, for example, a peel-off layer and an adhesive layer.

System differentiating “legitimate” images generated by scanning physical documents from “forged” document images, the system comprising a trained classifier, configured to sort a stream of incoming images into two classes including a first (“legitimate”) class of images generated by scanning physical documents; and a second (“forged”) class of images including images at least partly generated by a graphics editor rather than by scanning a physical document; and an output device operative to present, to an end-user, an output identifying, for at least one image I, whether said image I belongs to said first class or said second class; and an output device configured, responsive to classifications generated by the trained classifier, to provide an output indication of whether each of a plurality of images is generated by scanning a physical document, or is at least partly generated by a graphics editor.

System differentiating “legitimate” images generated by scanning physical documents from “forged” document images, the system comprising a trained classifier, configured to sort a stream of incoming images into two classes including a first (“legitimate”) class of images generated by scanning physical documents; and a second (“forged”) class of images including images at least partly generated by a graphics editor rather than by scanning a physical document; and an output device operative to present, to an end-user, an output identifying, for at least one image I, whether said image I belongs to said first class or said second class; and an output device configured, responsive to classifications generated by the trained classifier, to provide an output indication of whether each of a plurality of images is generated by scanning a physical document, or is at least partly generated by a graphics editor.

The invention relates to a pigment particle for security applications, comprising a duromer matrix and a plurality of core particles of a thermoplastic polymer with a feature substance dissolved in the core particles embedded therein, wherein the feature substance is an organic or metalorganic substance. The invention further relates to a method for producing security pigments, for example luminescent printing pigments, by means of incorporation into a duromer matrix of thermoplastic polymer particles in which the luminescent illuminant is present respectively in dissolved form.