A security document (200) includes a secure substrate (205). The secure substrate includes a viewing side (209) and a backing side (211), and a micro-optic system (305, 321) providing an optically variable effect (OVE) (513) on the viewing side. The security document further includes a protective layer (225), and a mask layer (215) disposed between the protective layer and the backing side of the secure substrate.

A hologram detection method according to an aspect of the disclosure, includes: inputting a first image, obtained by capturing a detection object on the basis of first flash intensity, to a neural network model to obtain a first detection result value representing the detection or not of a hologram for each of predetermined at least one detection unit regions; and comparing a threshold value with the first detection result value obtained for each detection unit region to determine the detection or not of a hologram in the first image and a first detection unit region where a hologram is detected.

A hologram detection method according to an aspect of the disclosure, includes: inputting a first image, obtained by capturing a detection object on the basis of first flash intensity, to a neural network model to obtain a first detection result value representing the detection or not of a hologram for each of predetermined at least one detection unit regions; and comparing a threshold value with the first detection result value obtained for each detection unit region to determine the detection or not of a hologram in the first image and a first detection unit region where a hologram is detected.

An optical member utilizing light from a point light source is enabled to visually perceive a reproduced optical image with a desired color. An optical modulation device includes an optical member having a light control part to reflect or absorb light in a predetermined wavelength and to pass through light in other than the predetermined wavelength in light in at least a visible light band, in accordance with a reproduction reference image for reproducing an original image, and a light transmissive part to pass through light in at least the visible light range including the predetermined wavelength.

Disclosed are an optical anti-counterfeiting element and an optical anti-counterfeiting product. The optical anti-counterfeiting element includes: a substrate, wherein the substrate includes a first surface and a second surface opposite each other; a micrographic layer formed on the second surface of the substrate, wherein the micrographic layer includes a micro-graphic-text region showing a preset graphic-text information and a background region, at least part of the micro-graphic-text region or the background region is covered with a small reflection surface, and the small reflection surface is covered with a color modulation structure; and a sampling layer formed on the first surface of the substrate, wherein the sampling layer is configured for sampling the micro-graphic-text layer and composing, with sampled graphics, the preset graphic-text information of a preset color showing a moire magnification effect. A colored anti-counterfeiting feature with a color varying effect showing a moire magnification effect can be generated without coloring.

Disclosed are an optical anti-counterfeiting element and an optical anti-counterfeiting product. The optical anti-counterfeiting element includes: a substrate, wherein the substrate includes a first surface and a second surface opposite each other; a micrographic layer formed on the second surface of the substrate, wherein the micrographic layer includes a micro-graphic-text region showing a preset graphic-text information and a background region, at least part of the micro-graphic-text region or the background region is covered with a small reflection surface, and the small reflection surface is covered with a color modulation structure; and a sampling layer formed on the first surface of the substrate, wherein the sampling layer is configured for sampling the micro-graphic-text layer and composing, with sampled graphics, the preset graphic-text information of a preset color showing a moire magnification effect. A colored anti-counterfeiting feature with a color varying effect showing a moire magnification effect can be generated without coloring.

A method to determine authenticity of a security feature of an identification document, characterized by receiving a real-time video feed of the identification document with a light source directed at the identification document to make visible a security hologram; processing the real-time video feed into a plurality of image sequence; analysing each image from the plurality of image sequence for a glare and the security hologram, wherein the glare is a reflection of the light source from the identification document; analysing the position of the glare and the security hologram in each image from the plurality of image sequence; evaluating whether the position of the glare and the position of the security hologram is caused by the light source; and providing authenticity result of the identification document captured from the real-time video feed.

A method to determine authenticity of a security feature of an identification document, characterized by receiving a real-time video feed of the identification document with a light source directed at the identification document to make visible a security hologram; processing the real-time video feed into a plurality of image sequence; analysing each image from the plurality of image sequence for a glare and the security hologram, wherein the glare is a reflection of the light source from the identification document; analysing the position of the glare and the security hologram in each image from the plurality of image sequence; evaluating whether the position of the glare and the position of the security hologram is caused by the light source; and providing authenticity result of the identification document captured from the real-time video feed.

A visual security feature is provided that is disposed on a target. The visual security feature includes two substantially transparent layers. At least one of the two substantially transparent layers is present in an image-wise pattern.

This patent document discloses physical documents including metameric ink pairs. One claim recites a document comprising: a first surface; a second surface, in which the first surface comprises a first set of print structures and a second set of print structures, in which the first set of print structures and the second set of print structures collective convey an encoded signal discernable from optical scan data representing at least a first portion of the first surface, in which the first set of print structures is provided on the first surface with a first ink and the second set of print structures is provided on the first surface with a second, different ink, and in which the first ink and the second, different ink comprise a metameric pair. Of course, other claims and combinations are described as well.