This invention is a wearable device or system for measuring food consumption using multiple sensors which are incorporated into smart glasses, a smart watch (or wrist band), or both. These sensors include one or more cameras on the smart glasses, on the smart watch, or both which record food images when eating is detected by a motion sensor, an EMG sensor, and/or a microphone. The smart watch (or wrist band) can also include a spectroscopic sensor to analyze the molecular and/or nutritional composition of food.

A highly secure optical key access control system utilizing unique optical refraction properties of non-duplicatable transparent objects to secure premises or computer databases is disclosed. The said access control system includes an optical key containing an optical element with unique refraction properties and an access module comprising a light source, an image catching array and an electronic processor. The optical element of the optical key is inserted into the access module between the light source and the image catching array at the initial and then several following prearranged positions and a resulting set of unique refraction images appearing on the surface of the image catching array is processed with the electronic processor for comparison against preauthorized sets of refraction images to grant or deny access to the protected premises or protected computer databases.

Highly secure optical key access control system utilizing unique optical refraction properties of non-duplicated transparent objects to secure premises or computer databases is disclosed.

Said access control system includes optical key containing an optical element with unique refraction properties and unique access module comprising source of light, image capture array and electronic processor. An optical element of optical key is inserted to access module between light source and image catching array at initial and then several following prearranged positions and resulting set of unique refraction image appeared at surface of image catching array processed with electronic processor for comparison against the existing database of preauthorized refraction images in database. If resulting set of unique refraction image match with some set of preauthorized refraction images the access to premises or computer databases is permitted.

A method and system for forming a holographic structure in a material. The holographic structure is configured to project a selected target image in the far field under illumination of the holographic structure by a laser. The method calculates a modified design for the holographic structure that encodes a unique identifier within the holographic structure for projecting the target image. The method modifies the material by mapping features corresponding to the modified design into the material so as to form the holographic structure. A basic check of the authenticity of the material is performed by checking whether a projected replica of the target image is as expected. A more detailed check of the authenticity of the material is performed by directly inspecting the features in the holographic structure.

A method for creating a nanostructure surface, comprises creating a nanostructure master having a surface being the negative of a shape that, when illuminated with a predefined illumination, provides a unique optical pattern; and creating nanostructure molds from the nanostructure master, wherein each nanostructure mold has a negative of the master surface which, when illuminated with the predefined illumination, provides the unique optical pattern, which may be a hologram. A nanotag may incorporate an image for identification and a unique pattern that can be identified for authentication.

A reflective particle tag reader system includes a read head assembly having a camera, illuminators, and a rigid frame portion for supporting the camera and the illuminators. The illuminators illuminate a focal point located opposite the camera where a reflective particle tag is placed. A computer in data communication with the camera receives and store images of the reflective particle tag that are acquired by the camera. The computer is programmed to process video images and to quantify a positional alignment parameter and an angular alignment parameter of the reader with respect to the reflective particle tag. A rapid burst of image frames is obtained in response to the positional alignment and the angular alignment parameters being within a predetermined tolerance and identity of the reflective tag is established between a first image set and a second image set.

In some examples, a system includes: at least one light capture device; an article of personal protective equipment (PPE) that includes a plurality of retroreflective elements embodied on a surface of the article of PPE in a spatially defined arrangement, each retroreflective element of the plurality of retroreflective elements having at least two different retroreflective properties; a computing device communicatively coupled to the at least one light capture device, wherein the computing device is configured to: receive, from the at least one light capture device, retroreflected light that indicates at least two different retroreflective properties of at least one retroreflective element of the plurality of retroreflective elements; determine, based at least in part on each of the at least two different retroreflective properties, a safety event; and perform at least one operation based at least in part on the safety event.

Optical articles including a spatially defined arrangement of a plurality of data rich retroreflective elements, wherein the plurality of retroreflective elements comprise retroreflective elements having at least two different retroreflective properties and at least two different optical contrasts with respect to a background substrate when observed within an ultraviolet spectrum, a visible spectrum, a near-infrared spectrum, or a combination thereof.

The present disclosure includes in one instance an optical article comprising a data rich plurality of retroreflective meats that are configured in a spatially defined arrangement, where the plurality of retroreflective elements comprise retroreflective elements having at least two different retroreflective properties, and where data rich means information that is readily machine interpretable. The present disclosure also includes a system comprising the previously mentioned optical article, an optical system, and an inference engine for interpreting and classifying the plurality of retroreflective elements wherein the optical system feeds data to the inference engine.

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.