Aspects are directed to a textile substrate with two or more ink layers and methods for printing a textile substrate. The two or more ink layers may include one or more visual components that form graphics or images that are visible to an observer when viewing the textile substrate from different angles.

An integral image device (1) comprises an array (20) of focusing micro-lenses (22), optionally a reflecting layer (40) and an image fragment plane (30). The reflecting layer is positioned on a same side of the array of focusing micro-lenses as a focal plane of the focusing micro-lenses as such. The reflecting layer is arranged for reflecting at least a part of light incident on a surface (49) of the reflecting layer facing the array of focusing micro-lenses. The image fragment plane has image fragment structures (32). The array of focusing micro-lenses is positioned between the reflecting layer and the image fragment plane. The image fragment plane is arranged to, when being viewed refracted through the array of focusing micro-lenses towards the reflecting layer, reflected by the reflecting layer and refracted back through the array of focusing micro-lenses from the reflecting layer, give rise to an integral image.

An integral image device (1) comprises an array (20) of focusing micro-lenses (22), optionally a reflecting layer (40) and an image fragment plane (30). The reflecting layer is positioned on a same side of the array of focusing micro-lenses as a focal plane of the focusing micro-lenses as such. The reflecting layer is arranged for reflecting at least a part of light incident on a surface (49) of the reflecting layer facing the array of focusing micro-lenses. The image fragment plane has image fragment structures (32). The array of focusing micro-lenses is positioned between the reflecting layer and the image fragment plane. The image fragment plane is arranged to, when being viewed refracted through the array of focusing micro-lenses towards the reflecting layer, reflected by the reflecting layer and refracted back through the array of focusing micro-lenses from the reflecting layer, give rise to an integral image.

A security element, a security device including a security element and a method of manufacturing a security device. The element having focusing elements and image elements, the image elements are located in an object plane such that each image element is associated with one of the focusing elements, wherein the object plane includes at least first and second distinct subregions, and an image element within the first subregion is phase-displaced by a phase-displacement distance with respect to an image element within the second subregion, and wherein the first and second subregions produce first and second optically variable images or part-images.

A security element, a security device including a security element and a method of manufacturing a security device. The element having focusing elements and image elements, the image elements are located in an object plane such that each image element is associated with one of the focusing elements, wherein the object plane includes at least first and second distinct subregions, and an image element within the first subregion is phase-displaced by a phase-displacement distance with respect to an image element within the second subregion, and wherein the first and second subregions produce first and second optically variable images or part-images.

Disclosed is a decorative object including an upper glass, a lower glass, a recessed pattern formed in the lower glass and facing the upper glass, a liquid filling the recessed pattern, the refractive index of the liquid being equal to that of the lower glass or differing from that of the lower glass by at most 10%, and solid elements which can move in the liquid.

A secure lens sheet or layer suitable for use in a micro-optic system, which is made up of a plurality of joined fine lens arrays (e.g., joined fine lenticular and/or joined fine non-cylindrical lens arrays), is provided. Each array has a lens pitch different from adjacent or contiguous arrays and/or is orientated in a direction different from adjacent or contiguous arrays. A micro-optic security device, which utilizes the inventive secure lens sheet and one or more overlying or underlying arrangements of micro-sized image icons (e.g., line data), is also provided. The image icon arrangement(s) and the secure lens layer are configured such that one or more synthetic images are projected by the security device. These projected images may show a number of different optical effects. With such a combination lens layer, some regions could be optically active when the device is tilted in one direction, some could be active when tilted in the opposite direction, and some areas could be active when the device is tilted in either (or any) direction. The inventive micro-optic security device may be partially embedded in and/or mounted on a surface of a security article (e.g., paper or polymer security document, label, card), or integrated therein.

A secure lens sheet or layer suitable for use in a micro-optic system, which is made up of a plurality of joined fine lens arrays (e.g., joined fine lenticular and/or joined fine non-cylindrical lens arrays), is provided. Each array has a lens pitch different from adjacent or contiguous arrays and/or is orientated in a direction different from adjacent or contiguous arrays. A micro-optic security device, which utilizes the inventive secure lens sheet and one or more overlying or underlying arrangements of micro-sized image icons (e.g., line data), is also provided. The image icon arrangement(s) and the secure lens layer are configured such that one or more synthetic images are projected by the security device. These projected images may show a number of different optical effects. With such a combination lens layer, some regions could be optically active when the device is tilted in one direction, some could be active when tilted in the opposite direction, and some areas could be active when the device is tilted in either (or any) direction. The inventive micro-optic security device may be partially embedded in and/or mounted on a surface of a security article (e.g., paper or polymer security document, label, card), or integrated therein.

In one embodiment, a computing device determines a Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA). The CAPTCHA includes a first static image that has image sections that are arranged in a first order. Each of the image sections corresponds to a unique identifier. The CAPTCHA further includes a second static image that includes each of the image sections of the first static image that are arranged in a second order. The computing device generates web-browser-executable code for converting the second static image to the first static image based on the first static image, the first order, and the unique identifiers. The computing device sends the second static image and the web-browser-executable code to a client device.

In one embodiment, a computing device determines a Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA). The CAPTCHA includes a first static image that has image sections that are arranged in a first order. Each of the image sections corresponds to a unique identifier. The CAPTCHA further includes a second static image that includes each of the image sections of the first static image that are arranged in a second order. The computing device generates web-browser-executable code for converting the second static image to the first static image based on the first static image, the first order, and the unique identifiers. The computing device sends the second static image and the web-browser-executable code to a client device.