44results about How to "Suppress aliasing" patented technology

A electric motor drive apparatus comprising a voltage control unit performing voltage control processing that determines alternating-current voltage command values serving as command values of the alternating-current voltages to be supplied to the alternating-current electric motor and generates switching control signals for the inverter; and a control mode selection unit selecting a synchronous control mode in which a cycle of electric angle of the alternating-current electric motor is synchronized with a switching cycle of the inverter, or an asynchronous control mode in which the cycles are not synchronized with each other. Current detection processing is performed to detect currents flowing in coils of the alternating-current electric motor in every standard calculation cycle that is set to a half of a cycle of the carrier.

A radar device (2) includes plural transmission antennas and plural reception antennas. The reception antennas constitute a reception-side antenna portion (20) and are arranged at an interval of d. The transmission antennas constitute a transmission-side antenna portion (18) and are arranged at an interval of d′=d×(n−1). The path length at which the electric wave is reflected from a target is identical between channels A9 and B1, and seventeen kinds of channels (A1 to A8, A9 or B1, B2 to B9) which are different in path length by every fixed distance are achieved. The data of the channels (A1 to A9 and B1 to B9) using different transmission antennas are respectively collected in different measuring cycles, and an error based on the time difference between the measuring cycles is corrected on the basis of a correction value calculated from the data of the channels A9, B1.

The invention discloses a figure five sense organ deformation method based on image local precise deformation. According to the method, various five sense organ types and five sense organ deformation templates are preset, deformation control points can be automatically generated, target positions of the control points are calculated, and various common deformation effects are achieved. In the deformation process of a facial image, an existing affine transformation deformation function based on an MLS is improved, and a localization processing technique capable of achieving precise image deformation is put forward; on the basis that deformation is controlled through the control points, attenuation calculation is carried out on an MLS deformation mapping result by means of setting of a control area, and on the premise that local smooth deformation is guaranteed, aliasing of image boundaries is prohibited. According to the method, figure five sense organ precision deformation can be achieved, the deformation result is smooth and highly vivid, an operation process is intelligent, complexity of use operations is reduced, and the method can be widely used for advertisement, animation and other fields.

Provided is a polarization resistance single line polarization interference and single Woodward prism spectral homodyne laser vibrometer, belonging to the laser interference measuring field. An interference portion utilizes a half-wave plate, a quarter-wave plate and an NBS to generate +/-45 DEG linear polarization reference light and linear polarization measuring light orthorhombic in a one way polarization direction and having light paths overlapped; the reference light and measuring light of a detection portion are split and generate four paths of optoelectronic signals with a phase position difference of 90 DEG through a same Woodward prism, thereby restraining outstanding features of non-linear errors from an optical path structure and principle. The vibrometer realizes four channel homodyne orthogonal laser interference measurement, effectively solves the problems that, in the prior art, polarization leakage and polarization aliasing exist in the optical path, output signals exist direct current biased errors and nonopiate errors, and non-linear errors of measuring results are obvious, and possesses significant technical advantages in an ultra-precision vibration measuring field.

The invention discloses an anti-polarization mixing single-path circular polarization interference and single wollaston prism splitting-type homodyne laser vibrometer, which belongs to the field of laser interference measurement. According to an interference part, circular polarization reference lights and circular polarization measurement lights with orthogonal single-path polarization directions and coincident light paths are generated through two quarter wave plates and a non-polarization beam splitter (NBS); according to a detection part, after the reference lights and the measurement lights are split, four paths of photoelectric signals with a phase difference of 90 DEG are generated via the same wollaston prism, and outstanding characteristics for suppressing nonlinear errors can be acquired in aspects of the light path structure and the principle. Four-channel homodyne orthogonal laser interference measurement can be realized, problems that polarization leakage and polarization mixing exist in the light path in the prior technical scheme, an output signal has DC bias errors and non-orthogonal errors, the measurement result has a significant nonlinear error and the like can be effectively solved, and significant technical advantages are provided in the field of ultra precision vibration measurement.

The invention discloses a video super-resolution reconstruction method based on adaptive interpolation kernel learning, comprising obtaining the interpolation kernel dictionary of a high resolution image block and a corresponding dual matrix according to a video image training set, wherein the video image training set comprises high and low resolution image blocks; obtaining the interpolation kernel of an image block structure corresponding to each atom in the interpolation kernel dictionary of a high resolution image block according to the interpolation kernel dictionary of the high resolution image block; and constructing the interpolation kernel of image small blocks of an image to be processed, and utilizing the interpolation kernel of image small blocks of the image to be processed to amplify the interpolation of the image to be processed according to the dual matrix and the interpolation kernel of an image block structure corresponding to each atom. The method at least partially better maintains edge and texture information in a video image, and effectively reduces distortion interference of aliasing, sawtooth, ringing, etc.

The invention discloses a cascade-based method for seamlessly superposing two-dimensional vectors on a three-dimensional topography surface. The method comprises the following steps of: (1) selecting a segmentation strategy for segmenting a view field pyramid; (2) performing cascade segmentation on the view field pyramid; (3) distributing vector information to sub view field pyramids; (4) completing narrow-down approximation of the vector information, and drawing vector textures; and (5) seamlessly superposing the vector textures on the three-dimensional topography. By carrying out cascade segmentation on the view field pyramid and surrounding frame-based narrow-down approximation on the vector information, the pixel utilization rate of the vector textures is greatly improved, the problemof deformation is inhibited to a large extent, the drawing effect is remarkably enhanced, thus the method can be well applied in a large scene roaming system and a three-dimensional geographic information system.

A color filter array is configured with a 3×3 basic array pattern repeatedly disposed in a horizontal and a vertical direction. The basic array pattern is configured with a G filter array formed by disposing a G filter in the horizontal direction, and first and the second RGB filter arrays formed by disposing RGB filters in the horizontal direction. The ratio of the pixel number of the G color is made larger than the ratio of the pixel number of each color of RB. The G filter is disposed in each filter line in the horizontal, vertical and oblique directions of the color filter array. The RB filters are each disposed in one filter line in the vertical direction of the basic array pattern, and any of the RB filters is disposed in other filter lines.

The invention provides a fault diagnosis method and system for a range hood based on EMD (Empirical Mode Decomposition) noise reduction. The fault diagnosis method comprises the following steps: performing de-noise processing on vibration signals which are collected during the operation of the range hood by adopting the empirical mode decomposition (EMD) method, so that the vibration signals after noise reduction are obtained; according to the vibration signals which are obtained after de-noise processing and extracted characteristics of the signals, performing fault diagnosis, so as to solve the problems that during the operation state monitoring of the range hood, noise reduction analysis on the vibration signals is carried out through integrated empirical mode decomposition (EMD) of non-stationary vibration signals, and the time-frequency characteristics of fault signals are extracted more accurately and rapidly, whether a fault is caused or not or the position of the fault can be determined, the finding and verifying time of fault locations is shortened, whether moving parts like a motor rotor and a wind wheel in the range hood have related failure problems or not can be rapidly diagnosed early without disassembling the overall range hood, both time and labor are saved, the fault diagnostic efficiency is improved, and the fault diagnosis accuracy degree is further improved.

The invention provides an anti-polarization-aliasing Michelson heterodyne laser vibration measuring instrument based on single acousto-optic modulation and non-polarization beamsplitting, and belongs to the field of laser interferometry. A non-polarization beamsplitter NBS is used to split beams to form a reference arm and a measuring arm. Through an acoustic optical modulator, diffraction occurs to the incident beam on the reference arm, frequency-shift first-order diffraction light is adjusted through a light beam reflex component, so propagation direction of the light beam is parallel to the direction of the incident beam. Through adjusting a reference cube-corner prism, reflected light is above the acoustic optical modulator, so that the reference light just passes through the acoustic optical modulator for one time. A measuring cube-corner prism is adjusted, so that when the reference light and the measuring light pass through the non-polarization beamsplitter NBS again, light beams are overlapped, and interference occurs. The instrument uses relatively few optical elements to realize heterodyne laser interference measurement, optical path adjustment is simple, and the instrument effectively solves problems in existing technical schemes of polarization leakage and polarization aliasing, and complex optical path adjustment. The instrument has substantial technical advantages in the field of ultra-precision vibration measurement.

The invention discloses a chromatographic overlapping peak decomposition method based on dual-tree complex wavelet transform; dual-tree complex wavelet transform is mainly adopted for decomposing chromatographic signals, and chromatographic overlapping peaks are separated by means of amplifying detail coefficients to reconstruct the signals. The method includes the steps of acquisition and preprocessing of the chromatographic signals, dual-tree complex wavelet decomposition and extraction of the detail coefficients, amplification of the detail coefficients, dual-tree complex wavelet reconstruction, and sidelobe suppression and reduction of spectra. Results show that the dual-tree complex wavelet transform effectively overcomes the disadvantages of poor aliasing resistance and translation sensitivity of traditional discrete wavelet transform, the effect of decomposition of the overlapping signals is better than that of a general real wavelet, and the accuracy of original spectrum peak characteristics and quantitative and qualitative analysis is ensured.

The invention discloses a linear motor rotor position measuring method. The linear motor rotor position measuring method is characterized in that a reference image with the gray level gradually changing is arranged on a base of a linear motor, a video camera fixedly arranged on a motor rotor continuously shoots the reference image, single-line sampling is carried out on every two adjacent obtained images many times at intervals, the image information of the same lines corresponding to the two images is extracted in each-time single-line sampling, a phase correlation algorithm based on singular value decomposition (SVD) is carried out on the two single-line images obtained through each-time single-line sampling to obtain the horizontal movement values of the two single-line images in the motor rotor moving direction, statistics is carried out on the obtained multiple horizontal movement values to obtain the most precise horizontal movement value, and then the displacement and the speed of the motor rotor can be obtained. According to the method, the simultaneous multi-sampling single-line processing is suitable for hardware parallel processing, and achievement is easy. The linear motor rotor position measuring method is used for achieving the precise measurement of the position of the linear motor rotor, and the real-time performance and the anti-interference in the measuring process can be guaranteed.

A solid-state imaging device is provided and has a plurality of pixel parts including three photoelectric conversion layers stacked above a semiconductor substrate, the plurality of pixel parts being arranged above the semiconductor substrate. The three photoelectric conversion layers, respectively, included in one pixel part are interposed between pixel electrode layers and opposing electrode layers. A region thus interposed is made a pixel region that generates a signal charge for formation of one pixel data. The pixel region includes a convex portion and a concave portion as viewed in plane view, and a part of the convex portion is arranged in a manner to put in a concave portion in a pixel region of an adjacent pixel part.

The invention belongs to the field of laser interference measurement, and relates to a quadrature error-free single-path polarization interference and double-Wollaston prism light-splitting type homodyne laser vibration meter. An interference part generates a single path of linear polarization reference light and linear polarization measurement light whose polarization directions are orthogonal and light paths are overlapped through a quarter-wave plate and a polarization-eliminating beam splitter NBS, and in a detection part, reference light and measurement light generate four paths of photoelectric signals with a phase difference of 90 degrees through two Wollaston prisms whose spatial rotation angles around light beams form a specific relation, thereby obtaining an outstanding characteristic of inhibiting a nonlinear error from a light path structure and in principle. The quadrature error-free single-path polarization interference and double-Wollaston prism light-splitting type homodyne laser vibration meter provided by the invention adopts less optical elements to realize four-channel homodyne quadrature laser interference measurement, can effectively solve the problems in an existing technical scheme that polarization leakage and polarization aliasing exist in the light paths, a direct current biased error and a non-quadrature error exist in an output signal, and a nonlinear error of a measurement result is obvious, and thus has remarkable technical advantages in the field of ultra-precise vibration measurement.

A polarization- and aliasing-resistance Michelson heterodyne laser vibration measurer based on double acousto-optic modulation and non-polarizing light splitting belongs to the field of laser interference measurement. A non-polarizing beam splitter (NBS) is adopted to perform light splitting and then form a reference arm and a measuring arm, incident light beams on the reference arm and the measuring arm generate diffraction via acousto-optic modulators, and frequency-shifted first-stage diffraction light are adjusted through light beam folding elements, so light beam propagation directions are parallel to the incident light beams; reflected light is located over acousto-optic modulators through adjustments of cube-corner prisms, so measuring light and reference light respectively pass through the acousto-optic modulators for one time; and the reference cube-corner prism and the measuring cube-corner prism are adjusted, so light beam superposition occurs when the reference light and the measuring light pass through the non-polarizing beam splitter (NBS) again, and an interference is generated. Heterodyne laser measuring is achieved through adoption of less optical elements, optical path adjustments are simple, problems of polarization leakage, polarization aliasing, complex optical path adjustments and the like which exist in an existing technical scheme can be effectively solved, and the laser vibration measurer has an obvious technical advantage in the ultra-precision vibration measurement field.

An anti-polarization aliasing double-path circular polarization interference and single-Wollaston prism light-splitting type homodyne laser vibration meter belongs to the field of laser interference measurement. An interference part generates two paths of circular polarization reference light and circular polarization measurement light whose polarization directions are orthogonal and light paths are overlapped through two quarter-wave plates and a polarization-eliminating beam splitter NBS, and a detection part generates four paths of photoelectric signals with a phase difference of 90 degrees through the same Wollaston prism after reference light and measurement light are split, thereby obtaining an outstanding characteristic of inhibiting a nonlinear error from a light path structure and in principle. The anti-polarization aliasing double-path circular polarization interference and single-Wollaston prism splitter type homodyne laser vibration meter provided by the invention can realize four-channel homodyne quadrature laser interference measurement, can effectively solve the problems in an existing technical scheme that polarization leakage and polarization aliasing exist in the light paths, a direct current biased error and a non-quadrature error exist in an output signal, and a nonlinear error of a measurement result is obvious, and thus has remarkable technical advantages in the field of ultra-precise vibration measurement.

The invention relates to the technical field of seismic wave field numerical simulation, and discloses a seismic wave numerical simulation method for complex surfaces and complex structures. For reasons of false wave problems of seismic source noises and the like easily occurring in an original algorithm, a stricter numerical flow mode such as local Lax-Friedrich numerical flow is forcedly adoptedfor performing wave field exchange between adjacent units in the original algorithm; by introducing a penalty factor, the influence of time step length reduction and the like caused by forced adoption of the local Lax-Friedrich numerical flow is reduced; and the advantages of large step length and low calculation cost of a leapfrog time DGFEM-based seismic numerical simulation algorithm can be kept and high-precision false-wave-free numerical simulation can be realized.