The paper analyzes the image quality in augmented reality display based on holographic waveguides. Brightness, brightness non-uniformity, image noise, etc., depend on the parameters of the waveguide substrate, the configuration, and the relief shape of diffraction optical elements. The optimal structure of holographic waveguides obtained by analog holography has been studied. The presented recommendations to achieve the best image quality are based on experimental results for different configurations of holographic waveguides.

Optically Variable Devices (OVDs) are widely used as security features in anti-counterfeiting efforts. OVDs enable the display of color dynamic effects that are easily interpreted by the user. However, obtaining these elements over large areas poses certain challenges in terms of efficiency. The paper presents a modified approach for manufacturing plasmonic type OVDs through dot-matrix technology, which is a standard origination step of security holograms. By adjusting the spatial filters in the optical scheme, it is possible to double the resolution of the recorded quasi-sinusoidal diffraction gratings. The experiments confirm the creation of diffraction gratings with frequencies from 1600 to 3500 lines per mm, which facilitates the production of plasmonic zero-order spectral filters. The paper shows how the transmission characteristics of the studied elements are affected by the geometric parameters of the diffraction grating, silver layer thickness, angle of incidence, and polarization of light. The results have shown that using the proposed method it is possible to obtain 1D or 2D structural color OVD-image on a large area - several square centimeters and more. High speed recording of such elements is provided: the exposure time was from 120 to 400 ms depending on the grating resolution for a 0.05 mm² frame, the total printing time for the size of the 25×25 mm² OVD was about 2.5 hours for a 1D element, and less than 3.5 hours for a 2D element. Thus, the proposed method and the OVD elements produced by it can be useful to designers of optical security elements as a simpler and faster alternative to electron-beam lithographic technologies.

In this research, studies were conducted on the possibility of providing thermal compensation of the information display device circuit based on a holographic waveguide when the wavelength of the radiation source ch as a result of changes in ambient temperature. A variant of implementing the waveguide structure in terms of the geometry of the diffraction gratings arrangement is proposed, its main parameters (grating period, thickness, refractive index) and the dependencies between them affecting the quality of the reproduced image are determined.

The review considers the present-day applications of assisted reality headsets, which have become an effective tool for the information support of industrial enterprise employees due to their adaptation to complex operating conditions. Assisted reality (aR) is a technology that allows users to see information on an opaque display that partially obscures their view. The review is based on a synthesis of open source information and focuses on the headset features in terms of ergonomic design and usability, computational and operational capabilities dictated by the industrial environment. It demonstrates the efficacy of aR headsets in a range of scenarios such as monitoring, quality control, remote support, maintenance, training, even when compared to the most promising augmented reality HMDs. The review also looks at how aR headsets can be developed with particular attention to the areas of human–machine interaction, tracking, indoor navigation, IIoT integration, and enhancing manufacturing through artificial intelligence.

The paper presents an augmented reality display based on the free-space combiner, consisting of two holographic mirrors: flat and spherical. A feature of such a system is a high-reflection coefficient of mirrors up to 90% for one wavelength and a high transmittance to the lumen up to 67% throughout the rest of the visible spectrum, unlike similar solutions implementing principles of polarization or dichroic beam splitting. The recording scheme and calculation of a separate flat holographic mirror and spherical holographic mirror are described. The proposed augmented reality display can provide multifocality, i.e., reproduction of virtual images at several distances, which demonstrates a certain perspective of this implementation in terms of compensation for the vergence accommodation conflict.

Subject of study . This study focuses on identifying image color based on a set of reference colors formed by optical glasses (color calibration measure) selected from a large set of light filters, without the use of spectrometers. Aim of study . The study aims to develop the design and fabrication process of a color calibration standard for color identification based on the distribution of the relative brightness of the red, green, and blue components of an image. Method . The red, green, and blue system is applied to determine the coordinates of the color cube by analyzing the chromaticity diagrams representing the distributions of the relative brightness of the corresponding color components. Main results . The use of the developed color calibration measure in combination with a white standard enables the identification of the color of an optical microscopy image with respect to a specific combination of the properties of the charge-coupled device sensor of a video camera and the display of a computerized microscope, as well as the alignment characteristics of its optical system. Practical significance . The proposed design and fabrication process of the color calibration measure enables large-scale preliminary pathological diagnosis in an automated mode of viewing histological micro-preparations without involving medical personnel.