Abstract: A method at least for determining an eye distance between a user's eye and an optical element of an optical system of a pair of data glasses including a virtual retina display. The method includes: generating a scanned laser beam; optically reproducing the scanned laser beam; illuminating a user's eye by means of the optically reproduced scanned laser beam; detecting a reflection signal reflected by the user's eye; ascertaining pupil positions within the detected reflection signal; determining relative distances of the pupil positions, ascertained from the reflection signal, to one another and/or to a common origin point and/or to one or more reference points; and calculating an instantaneous eye distance from the determined relative distances.

Abstract: A method at least for determining an eye distance between a user's eye and an optical element of an optical system of a pair of data glasses including a virtual retina display. The method includes: generating a scanned laser beam; optically reproducing the scanned laser beam; illuminating a user's eye by means of the optically reproduced scanned laser beam; detecting a reflection signal reflected by the user's eye; ascertaining pupil positions within the detected reflection signal; determining relative distances of the pupil positions, ascertained from the reflection signal, to one another and/or to a common origin point and/or to one or more reference points; and calculating an instantaneous eye distance from the determined relative distances.

Abstract: A method is provided for operating smart glasses including a virtual retinal display. In at least one method step, in particular a calibration step, a pupil size characteristic curve is generated in a user-specific manner in that a plurality of pupil sizes of a user eye are ascertained in the case of calibration images of different brightnesses generated by the virtual retinal display. In at least one further method step, at least one present pupil diameter of the user eye of the user of the smart glasses is determined using the pupil size characteristic curve.

Abstract: An optical system for a virtual retina display and a gesture detection of a user of the virtual retina display. The optical system includes a projector unit, an image source, and an image processing unit. The projector unit includes a first, second, and a third light source, and a first controllable deflection unit for scanning deflection of first, second, and third light beams. The optical system further includes a second deflection unit designed to transmit the first and second scanned light beams and to deflect the third light beam into a gesture detection area of the user. The optical system further includes a deflection unit, onto which the image content is projectable and which is configured to direct the projected image content and the second light beam onto an eye of a user.

Abstract: A method for ascertaining at least one eye state of at least one person situated in a defined spatial region. At least one light beam is directed, in a scanning manner, into the defined spatial region using a light source of a scanning laser feedback interferometry sensor. The defined spatial region has, in the horizontal direction, at least the dimension of a width of a head of the person. A modulation of the power of the light source of the laser feedback interferometry sensor is measured as a function of at least one light beam reflected back by at least one eye of the person situated in the defined spatial region. The at least one eye state of the at least one person situated in the defined spatial region is ascertained as a function of the modulation of the power of the light source, using a processing unit.

Abstract: An optical system for a virtual retina display and a gesture detection of a user of the virtual retina display. The optical system includes a projector unit, an image source, and an image processing unit. The projector unit includes a first, second, and a third light source, and a first controllable deflection unit for scanning deflection of first, second, and third light beams. The optical system further includes a second deflection unit designed to transmit the first and second scanned light beams and to deflect the third light beam into a gesture detection area of the user. The optical system further includes a deflection unit, onto which the image content is projectable and which is configured to direct the projected image content and the second light beam onto an eye of a user.

Abstract: A method for operating a pair of smart glasses. The method includes a step of outputting a wavelength-modulated light beam by a light source to an eye of a user of the smart glasses, the light beam being output utilizing a movable mirror element in a state of rest. The method also includes a step of receiving a portion of the wavelength-modulated light beam, reflected from a reflection point, as reflection beam. The method further includes a step of ascertaining a wavelength difference between the reflection beam and the wavelength-modulated light beam, utilizing a laser feedback interferometry sensor. The method also includes a step of determining a distance d between the light source 135 and the reflection point, utilizing the wavelength difference.

Abstract: A method for ascertaining at least one eye state of at least one person situated in a defined spatial region. At least one light beam is directed, in a scanning manner, into the defined spatial region using a light source of a scanning laser feedback interferometry sensor. The defined spatial region has, in the horizontal direction, at least the dimension of a width of a head of the person. A modulation of the power of the light source of the laser feedback interferometry sensor is measured as a function of at least one light beam reflected back by at least one eye of the person situated in the defined spatial region. The at least one eye state of the at least one person situated in the defined spatial region is ascertained as a function of the modulation of the power of the light source, using a processing unit.

Abstract: An apparatus for determining an interference in a transmission medium during a transmission of a data input signal according to an embodiment has a transform module configured to transform the data input signal from a time domain to a frequency domain comprising a plurality of frequency channels to obtain a frequency-domain data signal comprising a plurality of spectral coefficients, wherein each spectral coefficient is assigned to one of the frequency channels, an analysis module configured to determine the interference by determining one or more spectral interference coefficients, wherein each spectral interference coefficient is assigned to one frequency channel.

Abstract: A device for monitoring an eye position of a user's eye in a virtual retinal display. The device includes a laser projector unit generating a collimated scanned infrared laser beam, and an optical system optically guiding the scanned infrared laser beam to the user's eye. The optical system includes an optical element for the scanned infrared laser beam to pass through, or diverting the scanned infrared laser beam. The optical element forms a region in which the collimation of the infrared laser beam is maintained, to generate a bright pupil effect and/or a retina speckle pattern. The optical element forms a second region in which the infrared laser beam is focused on an iris of the user's eye, a center of the user's eye, or a cornea of the user's eye, to generate a glint.

Abstract: The invention relates to a method for separating particulates out of filtrates of a paper, cardboard, paperboard or pulp production plant and for reapplying the separated particulates to a surface of paper, cardboard or paperboard, comprising at least the following steps: a) separating the particulates out of the filtrates at a size of less than 1200 pm, b) coagulating the separated particulates of same, c) as applicable, mixing the separated particulates with further particulates from a paper, paperboard or pulp production, and/or microfibrillated cellulose (MFC), d) forming an aqueous suspension from the particulates, e) as applicable, adding to the suspension further additives for the surface treatment of paper or paperboard, selected from native and oxidatively degraded starch or calcium carbonate, f) homogenously applying the formed suspension to a paper or paperboard surface in a quantity between 0.5 and 30 g/m2, in particular 4 and 15 g/m2, and g) drying the paper or paperboard.

Abstract: A method is provided for operating smart glasses including a virtual retinal display. In at least one method step, in particular a calibration step, a pupil size characteristic curve is generated in a user-specific manner in that a plurality of pupil sizes of a user eye are ascertained in the case of calibration images of different brightnesses generated by the virtual retinal display. In at least one further method step, at least one present pupil diameter of the user eye of the user of the smart glasses is determined using the pupil size characteristic curve.

Abstract: A stretchable antistatic film can be formed in a production process using a specific thermoplastic polyurethane. The thermoplastic polyurethane is useful for the production of said film.

Abstract: A method for a pupil detection and/or pupil tracking with the aid of an evaluation of a speckle pattern back-reflected by an eye of a light of an infrared laser irradiated into the eye. At least the light of the infrared laser irradiated into the eye is scanned via a holographic optical element that includes different refractive structures, the different refractive structures being configured in such a way that they each generate a different visual defect correction.

Abstract: A method for recognizing misalignments and/or contaminations of optical systems in smart glasses, including at least one laser projector, which is provided for the purpose of outputting at least one light signal forming at least partially an image display of the smart glasses. It is provided that in at least one monitoring step, an at least partial back-reflection of the light signal generated by components of the optical system is detected and examined for deviations from a reference state.

Abstract: An information encoder for encoding an information signal includes: a converter for converting the linear prediction coefficients of the predictive polynomial A(z) to frequency values f1 . . . fn of a spectral frequency representation of the predictive polynomial A(z), wherein the converter is configured to determine the frequency values f1 . . . fn by analyzing a pair of polynomials P(z) and Q(z) being defined as P ? ( z ) = A ? ( z ) + z - m - l ? A ? ( z - 1 ) ? ? and Q ? ( z ) = A ? ( z ) - z - m - l ? A ? ( z - 1 ) , wherein m is an order of the predictive polynomial A(z) and I is greater or equal to zero, wherein the converter is configured to obtain the frequency values by establishing a strictly real spectrum derived from P(z) and a strictly imaginary spectrum from Q(z) and by identifying zeros of the strictly real spectrum derived from P(z) and the strictly imaginary spectrum derived from Q(z).

Abstract: A stretchable antistatic film can be formed in a production process using a specific thermoplastic polyurethane. The thermoplastic polyurethane is useful for the production of said film.

Abstract: A gradient coil unit includes a primary coil, a secondary coil and a carrier unit. The carrier unit stabilizes the primary coil and the secondary coil, and is formed from an encapsulating material. The carrier unit may include at least two encapsulating pockets that each include a delimiting structure and a filling. A thermoset component unit includes an electronic component and a carrier unit surrounding the electronic component, and being formed from an encapsulating material. The carrier unit may include at least one encapsulating pocket that includes a delimiting structure having a first material, and a filling having a second material.

Abstract: A method determines state information relating to a belt grinder. The belt grinder has at least one abrasive belt for grinding a workpiece. The method includes providing measurement data relating to the belt grinder, and determining the state information from the measurement data using a machine learning system. The machine learning system is configured to determine the state information based on the provided measurement data.

Abstract: The invention relates to compounds of a new type which have a stabilizing effect and in particular provide stabilization with respect to oxidative thermal and/or actinic decomposition of or damage to organic materials. The compounds are represented by general formula I specified below. The invention further relates to a method for producing such compounds, to compositions containing said compound, to a method for stabilizing organic compounds by means of the stabilizing compounds, and to the use of the stabilizing compounds to stabilize organic materials.