249 results about "Moiré pattern" patented technology

The invention provides a mechanical arm motion precision detection system and method based on moire fringes, and relates to the field of image data processing, and the system comprises a grating projection module which is used for determining grating parameters based on motion information of a mechanical arm and projecting a grating pattern to a detection surface of the mechanical arm based on the grating parameters, the grating parameters at least comprise grating density, grating angle and grating type; the image acquisition module is used for acquiring continuous frames of moire fringe images in the movement process of the mechanical arm; and the data processing module is used for carrying out phase calculation on the continuous frames of moire fringe images and resolving the displacement error, the rotation angle error and the vibration error of the mechanical arm, and the motion detection precision of the mechanical arm is improved.

The invention provides a deformation monitoring system and method based on phase information, and relates to the technical field of engineering surveying, and the system comprises a shooting equipment group which collects a time sequence image of a monitoring area and transmits the time sequence image to a data processing unit, and a plurality of deformation monitoring targets and control targets which are respectively arranged on the surface and the peripheral area of a target deformation body, the data processing unit is used for extracting the center coordinates of the targets according to the time sequence images, correcting the center coordinates of the deformation monitoring targets, correcting the time sequence images after the center coordinates of the deformation monitoring targets are corrected according to the center coordinates of the control targets, and outputting the corrected time sequence images. And calculating the displacement variation of the control target according to the corrected time sequence image through a Moire fringe method, obtaining the correction coordinate of the control target, carrying out fine compensation on the position of the deformation monitoring target in the corrected time sequence image according to the correction coordinate, and determining the deformation monitoring result of the target deformation body. And real-time and high-resolution deformation monitoring is realized.

Approaches presented herein provide for removal or reduction of anti-aliasing artifacts, such as Moiré patterns or staircasing, in an image to be rendered. In many instances, these artifacts correspond to regular texture patterns with fine detail, and the addition of randomization in sampling position can help to remove the impact of the regularity of the pattern. In at least one embodiment, a first order approximation can be used that introduces a random amount of shifting determined using texture coordinate derivatives. The random amount can account for any jitter offset, and shift the texture coordinates by the determined random amount, such that sample selected for that pixel will select from a sample location that corresponds to the random shift but is constrained to be within the bounds of the pixel.

The invention discloses a moire fringe signal compensation method and system based on an MSPSO optimization VMD algorithm. The method comprises the following steps: establishing a mathematical model of moire fringe signals; parameters of a multi-target particle swarm optimization algorithm MSPSO are set and initialized; obtaining a mathematical model of the optimized moire fringe signal; mapping the position of each particle into a parameter combination of a VMD algorithm; decomposing by using a VMD algorithm to obtain a plurality of intrinsic mode function IMF components; envelope entropy corresponding to the IMF component is calculated, and the minimum envelope entropy is used as a fitness function value; the optimal position corresponding to the minimum envelope entropy is recorded, and population extreme value updating is carried out to update the individual optimal position Pbest and the population optimal position Gbest; judging whether an iteration termination condition is met or not; and outputting a calculation result, performing error compensation on the grating moire fringe signal according to actual parameters obtained by calculation, namely decomposing and reconstructing the moire fringe signal, and outputting the compensated signal. According to the invention, noise compensation is realized; and resource occupation and hardware realization difficulty are reduced.

The invention provides a point positioning method based on a 3-D Moire effect, which adopts a point positioning system based on the 3-D Moire effect, carries out accurate spatial point positioning by utilizing the 3-D Moire effect brought by shadows generated by series masks fixed in front of a naked camera sensor, and carries out illumination by a beacon marked on a target point. The beacon is a target point needing to be positioned; according to the method, a positioning spectrum method is adopted to deduce a geometrical relationship between a beacon and a Moire pattern; a positioning model of the positioning spectrum method is considered to be a pinhole model with a periodic expansion range, and the frequency of a mask pattern determines an analogy focal length; the method is easy to implement, the algorithm is visual and simple, and the positioning resolution and precision are about one order of magnitude higher than those of a reference model (including a pinhole model and a single mask model).

The invention provides a high-precision alignment method and equipment for laminated iron, and relates to the technical field of laminated iron processing. Wire grid moire fringe marking and concentric circle moire fringe marking are conducted on a substrate and a laminated film, composite marking is achieved, the phase difference of the film is calculated and analyzed by collecting wire grid moire fringe image data, and the alignment precision of the laminated iron is improved. The method comprises the following steps: collecting concentric circle moire fringe image data, fitting a circle center coordinate and a wire grating angle by using Hough transformation to obtain a rotation deviation, and carrying out deviation coupling on the rotation deviation, the transverse deviation and the longitudinal deviation to generate a deviation coupling matrix. The deviation coupling matrix is used for compensating and adjusting the laminating position and compensating errors, high-precision decoupling detection and dynamic correction of translation deviation and rotation deviation are achieved, the transverse, longitudinal and rotation precision is greatly improved, the effective area occupied by the marking size on a base plate is small, and the method is more suitable for production of laminated steel with narrow breadth and high-density typesetting.

The invention discloses an optical film capable of effectively improving moire patterns, a composite brightness enhancement film and a backlight module. The optical film comprises a base material layer and a prism structure layer attached to the surface of one side of the base material layer. The prism structure layer comprises a first protrusion located in the middle and a plurality of second protrusions continuously arranged on the two sides of the first protrusion. Seen from the cross section, the first bulge is an isosceles triangle; the second protrusion is of an M-shaped prism structure and comprises a first bevel edge, a second bevel edge, a third bevel edge and a fourth bevel edge which are sequentially adjacent, the first bevel edge starts from the surface of the base material layer, and the fourth bevel edge ends at the surface of the base material layer. The first bevel edge and the second bevel edge form an included angle to form a first peak, and the third bevel edge and the fourth bevel edge form an included angle to form a second peak; the distance between the first peak and the second peak gradually increases or decreases along with the distance away from the first protrusion. The invention provides a novel anti-interference prism structure which can balance optical performance and is beneficial to improving production efficiency and controlling cost.

The invention relates to the technical field of virtual reality imaging devices, and discloses a moire-based virtual image display device, which comprises an image generation unit and a curved surface reflector, and is characterized in that light emitted by the image generation unit is reflected by the curved surface reflector to form an amplified virtual image; the image generation unit comprises a light source, an imaging unit and a grating which are sequentially arranged in the light propagation direction, the transverse size of an eye box of the virtual image display device is D, and the period of moire patterns formed by the imaging unit and the grating is larger than the eye box area size D by two times. By actively utilizing the moire effect, stray light energy is transferred to an effective visual area, the light utilization rate is improved, and the adverse effect of moire on an image is avoided; meanwhile, an existing peep-proof film is omitted, the material cost is reduced, and the adverse effect on definition caused by moire patterns generated by the peep-proof film and a pixel dual-period structure is avoided.

The invention discloses an unsupervised image moire pattern removing method based on deep learning. The method comprises the following steps: firstly, preparing a moire pattern image and a clear image which do not need to be paired; an unsupervised network model of image moire removal is constructed, and the model is based on a generative adversarial network architecture, is combined with a comparative learning method, and comprises a generator, a discriminator and a content encoder. And then carrying out unsupervised training on the constructed image moire removal network model. According to the method, the mapping relation from the moire image to the clear image can be learned from the non-paired data set, and the tedious work of collecting paired images in the real world is avoided. Experiments show that the method can achieve a good moire removal effect on a non-paired data set.

The embodiment of the invention provides a model training method and a focusing processing method, and relates to the technical field of terminals. The method includes training a focus model using moire-enhanced image data, and applying the model in a focus processing flow. When a user uses a terminal to shoot an electronic screen and moire patterns appear in an image, so that a traditional automatic focusing method is limited, the phase difference can be obtained through model reasoning, or the phase difference can be obtained based on laser ranging. Therefore, according to the obtained phase difference, the horse is adjusted to reach the corresponding position, focusing is achieved, picture focusing jitter in the terminal is avoided, and a user can shoot a clear image.

Systems and methods for image processing (e.g., image correction) are described. Embodiments of the present disclosure include image processing techniques that reduce or remove Moiré patterns by leveraging low resolution images (e.g., images captured using low resolution sensors, such as an ultra-wide camera). For instance, an image including a Moiré pattern may be corrected based on a second image having a low resolution. In one example, a device may capture a high resolution image that includes a Moiré pattern. The device may also capture a low resolution image that is aligned with the high resolution image and used to correct (e.g., remove) the Moiré pattern. In some embodiments, the systems and techniques described herein may be implemented in real-time on a user device (e.g., that includes a high resolution image sensor and a low resolution image sensor) for efficient and effective correction of Moiré patterns in image / video capture applications.

The invention discloses a coding Moire metasurface capable of dynamically controlling an ultrasonic beam and a preparation method of the coding Moire metasurface. The coding Moire metasurface comprises two same coding metasurfaces, the coding metasurface is composed of '0' and '1' with periodic coding sequences; each coding unit can be composed of a water column and a photosensitive resin column which are the same in height, and the stainless steel frame serves as a hard boundary condition between the coding units. By changing the coding sequences and relative angles of the two coding metasurfaces, the period of the moire pattern of the coding moire metasurface is changed, so that the dynamic control of different transmission ultrasonic beams is realized, for example, two or four beams of transmission waves are generated in water, and the elevation angle and azimuth angle of the transmission waves are continuously controlled. The method is simple in processing process and can be widely applied to the fields of multi-channel acoustic communication, remote dynamic detection and the like.

To provide a scientific instrument with an electron-beam column.SOLUTION: In some embodiments, a scientific instrument includes an electron-beam column configured to scan an electron beam across a sample. The electron-beam column includes a beam blanker configured to gate the electron beam in response to a drive signal. The scientific instrument also includes an electron detector configured to measure a flux of transmitted or scattered electrons having interacted with the sample, and an electronic controller configured to acquire an image of the sample using values of the flux measured with the electron detector for a plurality of electron-beam scan locations. The electronic controller is further configured to cause the drive signal to have a gating frequency at which the image has a moire pattern therein.SELECTED DRAWING: Figure 1

The present invention provides a reflective displacement measuring device, comprising: a projection system, an indicator grating, a reflective scale grating and a receiving system, wherein parallel light emitted by the projection system is incident on the indicator grating, and is incident on the surface of the reflective scale grating through the indicator grating, and then reflected back to the indicator grating to generate moiré fringes, which are projected to the receiving system and converted into electrical signals; the indicator grating comprises a glass substrate, a light-absorbing film is plated on the glass substrate, and a complex amplitude grating composed of an amplitude grating and a phase grating having only ±1-order diffraction fringes is etched on the light-absorbing film. The reflective displacement measuring device provided by the present invention can obtain an ideal light intensity distribution under the conditions of improving energy utilization and reducing the difficulty of manufacturing the grating.

The invention relates to the technical field of intelligent design of optical lenses, and discloses a multi-series superposed complex periodic structure arrangement method and system.The method comprises the steps of normalized coordinate transformation, multiple sine wave superposition, an iterative function system, a Julia set algorithm, an LSystem grammar system, parameter adjustment, moire fringe fusion and the like; and a complex periodic structure with high complexity, adaptability resistance and natural morphological characteristics is generated. Advanced technologies such as logarithm uniform distribution wave number generation, a chaos game algorithm, linear mapping complex number conversion, a turn graph interpreter, multi-scale entropy complexity quantification and an Otsu automatic threshold method are adopted, and accurate parameterization control and manufacturing adaptation are achieved. The system comprises a coordinate transformation module, a wave interference calculation module, a fractal generation module, a complex power system module, an LSystem processing module, a parameter control module and a contour surface extraction module. According to the invention, a systematic solution can be provided for complex structure design of optical devices such as myopia prevention and control lenses.

The invention provides a bridge displacement monitoring method and system based on phase information, and the method comprises the steps: obtaining a two-dimensional grating image of a bridge, and carrying out the preprocessing of the two-dimensional grating image, so as to obtain a one-dimensional grating image; performing sampling and interpolation processing on the one-dimensional grating image to obtain a plurality of moire fringes; determining a phase solving equation based on the plurality of moire fringes; solving the phase solving equation to obtain a Moire phase; the bridge displacement is determined based on the Moire phase, the final bridge displacement is determined through the Moire phase, the infinitesimal displacement change of the bridge can be effectively recognized, and the accuracy and precision of the determined bridge displacement are high.

The invention provides a screen information anti-leakage method and system, and relates to the field of information security, and the method comprises the steps: calculating and generating a target moire fringe pattern which can strongly interfere with secret photographing equipment based on preset secret photographing equipment parameters and the energy distribution of original information in a transform domain; the Hash value of the original information content and the dynamic safety parameters are subjected to logical operation and then input into a hyperchaotic system, a chaotic phase mask bound with the content and time is generated, amplitude-frequency information and a mask of moire fringes are combined, a preset imaging light path model is subjected to reverse optimization calculation, and a stable and effective anti-divulging disturbance pattern within a preset range is obtained. And carrying out pixel-level superposition on the anti-leakage disturbance pattern and the original information through a multi-scale fusion algorithm, generating a display frame, outputting the display frame to a screen, and updating the disturbance pattern along with the frame or the period to resist the attack of multi-frame average interference elimination.

The invention provides an image moire removing method and system based on wavelet transform, and the method comprises the steps: carrying out the frequency decomposition processing of a to-be-processed image through employing a wavelet transform mode, determining a high-frequency image and a low-frequency image, and enabling the to-be-processed image to have moire; performing texture distortion removal processing on the high-frequency image to determine a high-frequency image without texture distortion, and performing color distortion removal processing on the low-frequency image to determine a low-frequency image without color distortion; and carrying out fusion processing on the high-frequency image without the texture distortion and the low-frequency image without the color distortion by adopting a self-adaptive learnable fusion mechanism, and determining an image without the moire patterns. According to the image fusion method and device, the low-frequency color distortion component and the high-frequency texture distortion component are effectively and thoroughly separated by adopting a wavelet transform mode, and the image fusion process is adaptively adjusted by adopting an adaptive learnable fusion mechanism, so that the image reconstruction error is reduced, and the image quality and accuracy are improved.

A metrology system may receive one or more first images of an overlay target on a sample from a first detector, where the overlay target includes one or more Moiré structures, which may be formed as first-layer features and second-layer features that at least partially overlap and have different pitches. In the first images, the first-layer features and the second-layer features may be unresolved, but a Moiré pitch may be resolved. The system may further receive one or more second images of the overlay target from a second detector, where at least one of the first-layer features or the second-layer features are resolved in the one or more second images. The controller may generate a metrology measurement based on the one or more first images and generate a measurement of a systematic error associated with the metrology measurement based on the one or more second images.

Provided is an optical film requirement that does not use fine particles for light diffusion, is entirely composed of a transparent resin, and has a self-moire pattern that cannot be visually recognized by the naked eye, said optical film requirement having high front brightness without luminance unevenness on the light emission surface of a backlight when mounted on an edge-light backlight. A light-collecting auxiliary film inserted between the light emission surface of a light guide plate and the light incidence surface of a brightness enhancement film (BEF) in an edge-light backlight unit using discrete LED point light sources, the light-collecting auxiliary film being characterized by comprising: an optical waveguide layer comprising a light-transmitting base film, and a light-collecting layer comprising a light-transmitting base film, the light-collecting auxiliary film being interposed between the light emission surface of the light guide plate and the light incidence surface of the brightness enhancement film (BEF), the light-collecting auxiliary film being interposed between the light-emitting surface of the light guide plate and the light incidence surface of the brightness enhancement film (BEF); a light extraction layer that is formed on one surface of the optical waveguide layer and has a plurality of inverted rectangular pyramid-shaped unit recesses; and a light introduction layer formed on the other surface of the optical waveguide layer and having a plurality of unit triangular prisms extending in parallel in one direction, the light extraction layer constituting a light emission surface, and prism surfaces of the plurality of unit triangular prisms constituting the light introduction layer constituting a light incidence surface. The direction of the ridge lines of the plurality of unit recesses and the direction of the ridge lines of the plurality of unit triangular prisms intersect at an angle of 42 DEG to 48 DEG, and the light extraction layer, the optical waveguide layer, and the light introduction layer do not contain fine particles for light diffusion. The self-moire pattern generated by the plurality of unit recesses and the plurality of unit triangular prism lenses cannot be visually recognized by naked eyes.

The invention relates to a mask and wafer leveling method, which comprises the following steps of: vertically irradiating a leveling grating positioned on the surface of a mask by using a light source to generate a square moire fringe pattern; determining a first observation area in the lower side part of the right side area, and calculating a fringe rotation angle and an actual fringe frequency by extracting a moire fringe phase of the first observation area; calculating the angle offset of the wafer in the space when the cross section inclination and the longitudinal section inclination respectively occur relative to the mask; and performing feedback adjustment according to the measured angle offset. By measuring the phase change of the first observation area in the square Moire fringe pattern and then through formula conversion, the offset of the wafer in the space when the cross section inclination and the longitudinal section inclination respectively occur relative to the mask can be accurately calculated. The problem that an existing mask and wafer leveling method cannot achieve high-precision detection of the multi-interface inclination angle through single-point measurement is solved, and the measurement efficiency and the measurement precision are improved.

The present invention discloses an optical film, composite brightness enhancement film, and backlight module that effectively improve moiré patterns. The film comprises a substrate layer and a prismatic structure layer attached to one surface of the substrate layer. The prismatic structure layer includes a first protrusion located in the middle and a plurality of second protrusions arranged continuously on both sides of the first protrusion. In cross-section, the first protrusion is an isosceles triangle. The second protrusion is an "M"-shaped prism structure, comprising first, second, and fourth adjacent hypotenuses, with the first hypotenuse originating from the substrate layer surface and the fourth hypotenuse terminating therefrom. The first and second hypotenuses are arranged at an angle to form a first peak, while the third and fourth hypotenuses are arranged at an angle to form a second peak. The spacing between the first and second peaks gradually increases or decreases as the distance from the first protrusion increases. The present invention provides a novel anti-interference prism structure that balances optical performance, improves production efficiency, and controls costs.

The invention relates to the technical field of optical measurement, in particular to an optical measurement system and a measurement method thereof.The optical measurement system comprises a light source, a projection assembly, an imaging assembly and a receiving assembly, the projection assembly modulates light beams emitted by the light source through an optical mask, generates detection light carrying geometric patterns and projects the detection light to the surface of a sample to be measured; the detection light forms return light comprising reflected light and diffracted light on the surface of the to-be-detected sample, and the diffracted light is formed by diffraction of the detection light through a physical structure on the surface of the to-be-detected sample; the imaging assembly generates signal light carrying moire fringe information and diffracted light information by superposing the return light through a reference pattern structure; the receiving assembly comprises a filtering structure and a receiving module, diffraction light of the signal light is filtered out through the filtering structure to form target signal light, and the receiving module obtains defocus data based on the target signal light. According to the invention, diffracted light in signal light can be effectively filtered out, optical interference is avoided, and the accuracy of automatic focusing is improved.

A personalizable security document including a combination of two secure features, namely, a laser-engravable material embedded in a substrate of the security document and an embossed pattern formed in an outer surface of the substrate and overlapping the laser-engravable material. The combination of the laser-engravable material and the embossed pattern may result in a change in appearance of the embossed pattern when the security document is viewed at different observation angles. Security can be further enhanced by providing a watermark below the laser-engravable material. Further, by providing appropriate structures in the embossed pattern and the laser-engravable material, a personalized security document exhibiting a moiré effect can be obtained.

This utility model discloses an anti-glare glass and an electronic device. The anti-glare glass includes: at least one anti-glare surface; a groove array formed by multiple irregularly arranged grooves on the anti-glare surface; all grooves in the groove array have the same diameter, and the center distance between adjacent grooves is not exactly the same, and adjacent grooves share the same edge; the diameter of the grooves ranges from 15 to 150 μm, and the difference between the maximum and minimum diameter of the grooves is 3 to 70 μm; the depth of the grooves is the same; and the center distance between adjacent grooves is 15 to 120 μm. While possessing high anti-glare performance, it also eliminates flash points, moiré patterns, and rainbow patterns.

The invention belongs to the technical field of semiconductor processing, and discloses a cascade Moire effect-based photoetching alignment method, which comprises the following steps of: overlapping a silicon wafer and a mask, and placing a modulation grating behind the mask to perform cascade modulation on an alignment signal; collimated illumination is performed through a light source, and image acquisition is performed on the cascaded and modulated moire fringes by using an image acquisition unit; inputting the acquired image into a phase analysis model, and calculating alignment offset information of each group of moire fringes; the alignment offset information is processed through a demodulation algorithm model, and the final alignment offset is obtained through calculation; and finishing alignment of the mask and the silicon wafer by using the alignment offset. According to the photoetching alignment method provided by the invention, the precision and the sensitivity of a photoetching Moire alignment technology are improved by applying a cascade Moire effect, and sub-nano photoetching alignment can be realized.

The invention provides a light field 3D display moire simulation and suppression method. The method comprises the following steps: establishing a light field 3D display simulation model, simulating moire of a microlens array at different rotation angles, and performing frequency domain analysis to obtain an optimal rotation angle. The moire patterns generated by the micro-lens array at different rotation angles are simulated, and the high-frequency energy ratio of the moire patterns is calculated by using two-dimensional fast Fourier transform, so that the optimal rotation angle for suppressing the moire patterns is accurately obtained, and an effective solution can be provided for developing a high-definition light field 3D display screen without moire patterns.

The invention relates to the field of optical display and material engineering, in particular to an optical film with a 3D light splitting function and a manufacturing method of the optical film. An optical film with a 3D light splitting function comprises a transparent optical base material and a microstructure layer integrally formed with the surface of the transparent optical base material, the microstructure layer comprises a cylindrical lens grating layer and a parallax barrier layer, and the cylindrical lens grating layer is integrally formed on the surface of the transparent optical base material. The cylindrical lens grating layer is of a micro-nano structure formed by a nano-scale grating and a micron-scale cylindrical micro-lens array; the parallax barrier layer is located on the side, away from the transparent optical base material, of the cylindrical lens grating layer. The optical film has excellent optical efficiency, wider visual angle, excellent brightness uniformity and excellent moire inhibition capability, has 2D / 3D switching, peep-proof and other functions, can adapt to light requirements of different scenes, can serve as a core display optical element to be directly integrated in various display devices, and has wide application prospects. And the application limitation of an externally-pasted protective film is broken.

This invention belongs to the field of optical film technology, specifically high-definition optical composite coating films and their preparation methods. This invention aims to solve the problem that existing optical composite films cannot simultaneously achieve both optical enhancement and viewing angle. This invention involves mixing a nano-conductive polymer, a silicone additive, and a diffusion liquid to obtain a diffusion layer coating liquid; dispersing PMMA-PS microspheres in the diffusion layer coating liquid to obtain a composite coating liquid; mixing a prism layer resin and nano-silica to obtain a prism layer coating liquid; coating the back of a PET substrate with the composite coating liquid and passing it through a microlens array to obtain a diffusion layer; coating the front of the substrate with the prism layer coating liquid to obtain a prism layer; and finally, after curing, attaching a PE protective film to one side of the prism layer to obtain the composite coating film product. The composite coating film prepared by this invention has excellent optical enhancement, a good viewing angle, and effectively suppresses moiré patterns.