65results about How to "No aliasing" patented technology

The invention relates to an augmented reality-based scene recognition method and device, a storage medium and a device. The method comprises the following steps: a depth camera is called to shoot an object scene, and spatial three dimensional information of the object scene is obtained; according to the spatial three dimensional information of the object scene, virtual information to be displayedand a display position of a screen for the virtual information to be displayed are obtained; according to the virtual information to be displayed and the corresponding display position for the same, adisplay instruction used for controlling display of the corresponding virtual information to be displayed at the display position of the screen is generated, and the display instruction and the virtual information to be displayed are sent to the screen. Via the spatial three dimensional information of the object scene, the virtual information to be displayed and the display position for the sameare obtained; direct control over display of the virtual information to be displayed at the display position for the same is realized, display of virtual frames of the object scene on the screen is not needed, users are enabled to feel virtual information displayed on the screen with naked eyes when watching the screen and feel supplemental superposition of real object scenes seen beyond the screen, and good visual effects can be realized.

An SVR antifriction bearing performance degradation prediction method based on a krill-herd algorithm belongs to the field of functional approximation rotating machinery prediction methods. The method comprises the following steps: firstly analyzing time domain, frequency domain and time-frequency domain feature indexes, and proposing a feature extraction method based on combination of CEEMD and wavelet packet half-soft threshold noise reduction to perform fault diagnosis of an antifriction bearing; performing comprehensive evaluation of the fault degradation feature of the antifriction bearing for multiple feature parameters, and proposing a method of combining the LLE nonlinear feature dimension reduction method with the fuzzy C mean value; and finally, introducing the basic theory of the support vector regression machine, and proposing the prediction model of multivariable support vector regression machine based on the krill herd algorithm, optimizing parameters of the SVR, and selecting the optimal C, [sigma] parameters. The method is advantaged by high prediction precision, short calculation time, and good feature value prediction effect after clustering. The degradation process of the antifriction bearing can be precisely predicted through the abovementioned three steps.

The invention discloses a non-aliasing reconstruction method of high-speed leaf undersampled leaf apex vibration signals. The method comprises the following steps that (1) a leaf apex timing signal acquisition system is used for obtaining undersampled leaf apex vibration signals, (2) the frequency band range of high-speed leaf vibration performance is determined, (3) leaf apex vibration signals are reconstructed for the first time based on the Shannon sampling theorem, (4) proper wavelet packet decomposition layer numbers are determined to enable the assigned frequency band range is consistent with one frequency band after wavelet packet decomposition, (5) signals in the assigned frequency band range are reconstructed again from the reconstructed signals hat(z)[n] at the first time using wavelet packets, (6) the coefficients of wavelet packets except for the Rth wavelet packet are all set to be zero, and the traditional wavelet packet reconstruction algorithm is utilized for reconstructing signals in the frequency band range of [f0-B0/2, f0+B0/2]. The non-aliasing reconstruction method is simple in process and easy to realize, reconstructed signals are not deflected and not in aliasing, and real and reliable high-speed leaf vibration signals can be provided.

The invention relates to a configurable digital correlator for a complete polarization microwave radiometer system. At a radio frequency front end of the complete polarization microwave radiometer system, a signal after frequency-mixing amplification and orthogonal transformation is transformed to be a differential signal and then is input into four ultrahigh-speed ADC (Analog to Digital Converter) input ends to be converted into a digital signal after sampling conversion, and the digital signal after multi-path multiplexing is input into a digital correlative circuit; the digital correlativecircuit comprises a parameter selection module and a correlative calculation module, wherein the parameter selection module returns a command to modify a digital correlative digit parameter and an integration time parameter in an FPGA (Field Programmable Gate Array) through a serial port of a computer to configure the FPGA in real time so as to realize digital correlation from 2 bits to 12 bits and selection of the integration time from 5ms to 50ms; and the correlative calculation module executes deceleration and correlative calculation processing on the input digital signal after determiningquantization digit and the integration time and outputs a correlation result to a computer through a data format conversion and external interface circuit according to a required sequence.

The invention provides an undersampled leaf apex timing vibration signal reconstruction method and a device thereof. The method comprises the steps of (1) acquiring the displacement sampling data of a non-uniform blade end based on a blade end timing vibration measurement system; (2) determining the vibration characteristics of a high-speed blade and the frequency band range of the high-speed blade; (3) based on the periodic non-uniform sampling theory, completing the interpolation reconstruction for the vibration signal of the blade. The vibration displacement is acquired by a first blade end timing sensor and a second blade end timing sensor, wherein the first blade end timing sensor and the second blade end timing sensor are arranged in a casing. Based on the method, reconstructed signals are agonic and non-biased. Meanwhile, only by means of two blade end timing sensors, corresponding data can be acquired. In this way, not only data can be acquired completely and accurately, but also the cost is effectively reduced.

The invention provides an inhomogeneous undersampled blade end timing vibration signal reconstruction method and device, and the method comprises the following steps: 1), obtaining inhomogeneous blade end displacement sampling data through employing a blade end timing vibration measurement system; 2), determining the vibration characteristics and frequency band range of a high-speed blade; 3), achieving the interpolation reconstruction of a blade vibration signal based on a periodic inhomogeneous sampling principle. The method causes no deviation and aliasing during signal reconstruction.

The invention discloses a full-Stokes interference imaging spectral device and a method based on time-sharing polarization modulation. The full-Stokes interference imaging spectral device comprises a time-sharing polarization modulation device and a slit-free Sagnac interference imaging spectral device. The time-sharing polarization modulation device can be composed of a rotatable phase delayer and a fixed linear polarizer. The Sagnac interference imaging spectral device is composed of two imaging objective lens, a collimating objective lens, a Sagnac shear beam splitter, and an imaging detector. A target beam to be detected is incident on the time-sharing polarization modulation device to generate four different polarization states; after the target beam to be detected passes through the interference imaging spectral device, four groups of target images carrying different polarization state information and interference information are obtained on the target surface of the imaging detector; and through data processing, four-dimensional light information of a detection target scene is obtained ultimately, namely, two-dimensional spatial information, spectral information of each point, and full-Stokes polarization information of each spectrum. The full-Stokes interference imaging spectral device of the invention has the advantages of high luminous flux, high spatial resolution, and the like.

The invention discloses a seismic data multiple elimination method. The method comprises the following steps: S1, inputting three-dimensional data d(offx,t), and according to three-dimensional space coordinate information, extracting channel sets as three-dimensional surface element channel sets dbin(y,x,t); S2, calculating nonlinear trend fitting coefficients p(x) and p(y), writing out conversionoperators Lx, Ly and Lxy, and calculating Radon domain data M; S3, cutting the Radon domain data to obtain a multiple model mra, and performing calculation and conversion to obtain a time-space domain multiple model; S4, performing subtraction to obtain three-dimensional surface element channel sets p after multiple elimination; and S5, sequentially arranging the channel sets according to scalaroffsets to obtain three-dimensional data after multiple elimination. The high-frequency calculation is restrained through a low-frequency result; the low-frequency result does not generate an alias frequency in operation, so that a relatively good high-resolution effect still can be achieved under the condition of sampling sparseness; and meanwhile, the process of improving the resolution by a conventional iterative method is avoided, so that the calculation efficiency is greatly improved.

The invention, which relates to the technical field of spectral imaging, discloses a preposed common-caliber dual-band achromatic lens of a Fourier transform imaging spectrometer, thereby solving problems existing in the existing wide-spectrum infrared telescopic system. The lens comprises an aperture diaphragm, a first lens, a second lens, a third lens, a beam splitter, a compensation plate and astepped lens that are sequentially arranged from an object side to an image side according to the optical path trend. The first lens is a convex lens with positive diopter, the second lens is a concave lens with negative diopter, and the third lens is a concave lens with negative diopter. According to the invention, an image space telecentric light path is adopted; the relative illuminance of theimage surface edge is close to 1; distortion in dual bands is smaller than-0.2%, transmission values at 101p/mm are close to diffraction limit, the focal depth of the system meets the total height ofthe stepped mirror; a design result shows that the maximum change rate of an MTF value during imaging at different stepped height positions does not exceed 0.9%; and meanwhile, the lens further has advantages of being large in caliber, high in flux and the like.

The embodiment of the invention discloses an image edge detection method and device and a storage medium. According to the embodiment, a to-be-detected image is acquired, then an original brightness value of pixel points in the to-be-detected image is acquired, linear filtering is performed on the pixel points in the to-be-detected image, a brightness value of the pixel points after linear filtering is obtained, a brightness difference value between the brightness value of the pixel points after linear filtering and the original brightness value is acquired, and edge pixel points in the to-be-detected image are determined according to the brightness difference value. Through the scheme, image edge detection can be performed based on the linear difference value of pixel brightness, a soft edge can be obtained, a sawtooth effect does not exist, and the visual effect of the edge is improved; and besides, noisy points can be filtered by adjusting filtering parameters of linear filtering, influences of the noisy points are eliminated as far as possible, and the precision of image edge detection is improved.

According to the embodiment, the invention relates to a computed tomography device, a scanning method and an image reconstruction method. The computed tomography device comprises a fixed frame (1), arotary frame (2), a light source generating device (3), a signal detection device (4) and a scanned object supporting device (5), wherein the rotary frame (2) can rotate around some fixed point in anX-Y plane, and the scanned object supporting device can be kept immobile in an Z direction; the light source generating device (3) is arranged on the rotary frame (2) and is opposite to the position of the light source generating device, and the signal detection device, in a rotating process, is free from change in position relative to the light source generating device, so that a cone beam lightsource can be received by an area array of the signal detection device; and the signal detection device is of an area-array structure adaptive to collection of the cone beam.

The invention discloses a manufacturing process of a laminated film mold. The manufacturing process of the laminated film mold comprises the following steps of (1) preparing a shading film, namely, coating a photosensitive material on a PET base material, and exposing and developing to obtain the shading film with a required texture pattern; (2) preparing a texture film, namely, applying UV glue on a texture female die substrate, covering the UV glue with a PET film, transferring the required texture on the PET film through transfer printing machine impressing and UV photocuring, and separating the texture female die substrate from the PET film to obtain a PET texture film; (3) laminating the texture surface of the shading film prepared in the step (1) with the non-texture surface of the PET texture film prepared in the step (2), and defoaming and cutting to obtain a semi-finished product of the film mold; and (4) performing PVD coating on the texture surface of the PET texture film ofthe semi-finished product of the film mold to obtain a finished product of the film mold. The film mold has the advantages of being good in toughness, high in precision, high in yield and simple in process.

The invention relates to a digital meter panel drafting method based on OpenGL-ES and belongs to the real-time image display technology field. According to the method, an antialiasing drafting method is employed to carry out line drafting of a digital meter panel, lines drafted based on OpenGL-ES are divided into at least two triangles from edges to the center, and triangle vertexes are assigned with different transparency degrees to realize smooth fusion of line colors and background colors of the drafting result. The method is advantaged in that the lines of the drafted digital meter panel have no sawtooth, the edges and the background can realize excellent fusion, compared with full screen processing of an anti-sawtooth function defaulted by OpenGL-ES, drafting efficiency can be substantially improved through antialiasing line drafting.

The invention discloses a printing method. The printing method comprises the steps that an elastic coating is formed on a substrate through spraying; a first kind of ink with the granularity as a first value is utilized for carrying out printing on the elastic coating to obtain a first printing coating; and a second kind of ink with the granularity as a second value is utilized for carrying out printing on the first printing coating to obtain a second printing coating, wherein the second value is smaller than the first value. The method is used for solving the technical problem that in the prior art, due to the fact that the surface roughness of the elastic coating is high, when ink with higher glossiness is utilized for printing marks on the surface of the elastic coating, the sawtooth phenomenon can appear at the edges of the marks. The technical effect that when the ink with higher glossiness is utilized for printing the marks on the surface of the elastic coating, the sawtooth phenomenon cannot appear at the edges of the marks is achieved.

A medium-wave infrared Fourier transform imaging spectrometer athermalization secondary imaging system relates to the technical field of spectral imaging, solves defects of an athermalization technology of an existing infrared optical system, and comprises a stepped micro-reflector, a beam splitter, a compensation plate, five lenses, a detector window, a detector cold diaphragm and a detector array plane. By solving a focal power distribution equation, a system out-of-focus equation caused by a lens refractive index change and a material thermal expansion and lens cone thermal expansion equation, three materials of chalcogenide glass, germanium and silicon are mutually combined to realize a passive athermalization function. According to the system, the passive athermalization function is realized in a temperature range of-20 DEG C to 60 DEG C, relative illuminance of an edge of an image surface is close to 90%, a distortion amount is less than 0.4%, a transmission function value at 171p/mm is close to a diffraction limit, a depth of field of the system meets a total height of a stepped mirror, and a design result shows that a maximum change rate of a MTF value of the system does not exceed 1% when imaging is performed by taking different stepped height positions on an object plane. The system realizes 100% matching of a cold diaphragm without vignetting.

The invention discloses a photoelectric sensing device and electronic equipment. The photoelectric sensing device comprises a semiconductor substrate, wherein the semiconductor substrate comprises a first surface and a second surface opposite to the first surface; a plurality of light sensitive pixels are formed on the first surface of the semiconductor substrate; a plurality of through holes which pass through the semiconductor substrate toward the first surface are formed on the second surface of the semiconductor substrate; and the through holes correspond to the light sensitive pixels. Theelectronic equipment comprises the photoelectric sensing device.

The present invention provides a novel unmanned mobile platform. The platform comprises a platform main body, the front end of the platform main body is provided with infrared high-definition cameras and an ultrasonic distance measurement sensor, radar detectors are installed at the side surface and the back surface of the platform main body, and tires are connected with a tire automatic correction system; the platform main body is internally provided with a remote control system, the remote control system comprises a platform control host and a communication server, a data server and a plurality of remote control computers located at a monitoring center, the remote control computers are externally connected with a steering wheel, a USB handle, an accelerator and a brake pedal to perform remote control of the platform; and the infrared high-definition camera and the platform control host are connected with the monitoring center through a wireless communication mode to return video data and the state information of the platform back to the monitoring center and transmit the platform control data issued by the monitoring center to the platform control host. The novel unmanned mobile platform is simple in structure, can perform accurate remote operation and control, can automatically straighten tires and is more convenient to use.

The invention relates to a laser ranging method and system for eliminating double-optical-comb frequency spectrum aliasing, and the system comprises a first optical comb, a signal optical pulse emitted by the first optical comb passes through a first spectroscope, one beam of light enters a reference mirror, the other beam of light enters a measurement mirror, and the reference mirror and the light reflected by the measurement mirror are emitted to a second spectroscope through the first spectroscope; a second optical comb which emits a local oscillation light pulse to enter the second spectroscope and interferes with the light emitted by the first spectroscope; a first band-pass filter which is used for acquiring a frequency component of a part of light emitted by the second spectroscopein a certain frequency range; a second band-pass filter which is used for acquiring a frequency component of the other part of light emitted by the second spectroscope in another frequency range; anda signal processor which is used for processing the acquired frequency component signal to complete distance measurement.

The invention discloses a long-wave infrared Fourier transform imaging spectrometer athermalization relay imaging system, relates to the technical field of spectral imaging, and solves the defect of poor athermalization of the existing long-wave infrared optical system. The front surface of a first lens is a cylindrical mirror, a second lens is a refractive-diffractive hybrid lens, the front surface is a binary surface, the rear surface of a fifth lens is an even aspheric surface, and a beam splitter and a compensation plate are parallel flat plates. The beam splitter and the compensation plate are both made of zinc selenide, the first lens is a convex lens with positive diopter and is made of zinc selenide, the second lens is a convex lens with positive diopter and is made of germanium, the third lens and the fifth lens are convex lenses with positive diopter and are both made of zinc selenide, and the fourth lens is a concave lens with negative diopter. The relative illuminance of the edge of the image plane is greater than 85%, the distortion is less than 0.4%, the transmission value at the 171p/mm position is close to the diffraction limit, the depth of field of the system meets the total height of the stepped micro-reflector, and the maximum change rate of the MTF value of the system does not exceed 1.5% when different stepped height positions are taken as the object planefor imaging.

The embodiment of the invention provides a volume holographic optical waveguide, a manufacturing method thereof and a color volume holographic optical waveguide. The method comprises the following steps of: providing a holographic plate, a prism and plate glass; arranging a first side of the holographic plate on a first surface of the prism; arranging a second side of the holographic plate on a first surface of the plate glass; arranging the first surface of the prism, the holographic plate and the plate glass in an attached mode through refractive index matching liquid, or filling the space among the first surface of the prism, the holographic plate and the plate glass with the refractive index matching liquid; and performing primary exposure on the holographic plate through multiple beams of laser. According to the manufacturing method, when the volume holographic optical waveguide is used, a manufactured coupling-in grating, coupling-out grating and turning grating are all reflection-type volume holographic gratings, it can be avoided that multiple composite gratings are overlapped in needed gratings subsequently, and the field angle size and field brightness uniformity of the volume holographic optical waveguide are improved.

The invention relates to mask slurry and a preparation method thereof, and belongs to the technical field of chemical materials. The mask slurry comprises the following components (by mass): 1%-12% ofsolid resin, 20%-60% of an organic solvent, 30%-70% of inorganic powder A, 0%-40% of inorganic powder B and 0%-5% of a pigment. In a mask slurry system, the dosage, the particle size and the morphology of the inorganic powder A are limited; meanwhile, compounding with solid resin, an organic solvent, inorganic powder B and a pigment, the inorganic powder A can form hydrogen bonds with the polar solvent and the resin so as to form a cross-linked network structure, so that the mask slurry has good printing performance, washing performance, dry film adhesive force and volatile performance and excellent thixotropic performance under the condition that an organic thixotropic agent is not added.