11 results about "Symmetric axis" patented technology

This imaging element (3) includes a pixel array (40) in which a plurality of pixels (41) including a photoelectric conversion element are arranged in a two-dimensional array, and a spectroscopic element array in which spectroscopic elements having periodic arrangements of a plurality of fine structures for focusing incident light on different positions on the pixel array (40) according to the polarization direction and the wavelength component of the incident light are arranged in a two-dimensional array. The arrangement period of the plurality of fine structures is shorter than the wavelength of light to be received by the pixel array (40), and all or a part of the plurality of fine structures has a line symmetry axis, and has a surface that is shaped so as to differ in length between the direction of the line symmetry axis and the direction orthogonal to the line symmetry axis as a surface on which the incident light is incident. The line symmetry axis and the structure are modulated according to the position in the spectroscopic element.

This application provides a bidirectional alignment calibration device, method, and bidirectional alignment equipment. When the first spectral confocal system forms a first angle with the optical symmetry axis, the first spectral confocal system is translated a fixed distance relative to the marker plate along the optical symmetry axis for the first time. The difference between the first distance and the second distance corresponding to the first spectral confocal system before and after the first translation is obtained. After rotating the marker plate around a first vertical direction, such as the z-axis, by a set angle, the first spectral confocal system is translated a fixed distance relative to the marker plate along the optical symmetry axis for the second time. The difference between the third distance and the fourth distance corresponding to the first spectral confocal system before and after the second translation is obtained. The first angle is obtained by solving the first and second sine relationships of the two translations, ultimately achieving coaxiality of the bidirectional spectral confocal system. Simultaneously, the overlapping working distances of the bidirectional imaging alignment system and the bidirectional spectral confocal system are measured and calibrated, improving reliability.

The application discloses a solar meridian extraction method, device, equipment, medium and product, relates to the technical field of atmospheric polarized light navigation, and comprises the following steps: acquiring an original polarization image of a target area; in a Cartesian coordinate system, determining a linear polarization degree of an effective data area according to the original polarization image; performing coordinate system conversion on the linear polarization degree and determining an optimal symmetry axis based on a mirror symmetry principle; extracting a polarization angle corresponding to the effective data area based on the linear polarization degree of the effective data area; performing complex conversion and coordinate system conversion on the polarization angle corresponding to the effective data area to determine an antisymmetric polarization angle; extracting a skip line estimation value by using an antisymmetric mode according to the antisymmetric polarization angle; and fusing the optimal symmetry axis and the skip line estimation value through time series filtering to obtain a solar meridian. The application can improve the extraction precision of the solar meridian, thereby improving the precision of heading estimation.

The application relates to the technical field of image processing, and discloses a reflection symmetry detection method and system of a two-dimensional image, a terminal and a storage medium.The method comprises the following steps: obtaining an original image in a preset data set, and performing pretreatment and non-symmetry region denoising processing to obtain a non-symmetry region denoising feature map; performing rotation processing on the original image to obtain a target rotation image score map; calculating rotation loss between the target rotation image score map and the non-symmetry region denoising feature map, and obtaining a reflection symmetry axis prediction feature map according to the rotation loss; performing binary mask fusion processing and probability Hough transformation processing on the reflection symmetry axis prediction feature map to obtain an image reflection symmetry axis.The application can effectively improve the accuracy of image reflection symmetry axis detection by performing non-symmetry region denoising processing on the preset data set to obtain a non-symmetry region denoising feature map, and calculating rotation loss between the non-symmetry region denoising feature map and a target rotation image score map.

The invention provides a reconfigurable spin probability bit device and a control method thereof, and relates to the technical field of spin probability bits. The control method of the reconfigurable spin probability bit device comprises the following steps: determining a symmetry axis of a spin conversion layer of the reconfigurable spin probability bit device; determining an included angle between the direction of the first pulse and the symmetry axis according to the direction of the first pulse injected into the spin conversion layer; the magnetization state of the magnetic free layer is switched between a first magnetization state and a second magnetization state by regulating and controlling the size of the first pulse and the size of the included angle, and the probability of switching to any magnetization state between the first magnetization state and the second magnetization state is regulated and controlled; wherein the magnetization directions of the first magnetization state and the second magnetization state are opposite.

The invention relates to the technical field of CL imaging, in particular to a CL system rotating shaft projection position calculation method. The method comprises the steps that a sample is placed on an objective table, the height is adjusted to ensure complete projection capture, the objective table is controlled to rotate by a circle to collect a plurality of projection images with marked angles and coordinates at equal angle intervals, all the projections are superposed to generate a composite image, and fixed feature points form an elliptical orbit; delimiting a row coordinate interval containing effective sample projection points in the row direction of the composite image as a candidate symmetry axis search range, traversing the row position of each hypothetical symmetry axis in the range, constructing a symmetric row pair combination, and calculating the sum of pixel value differences of all row pairs under each hypothetical symmetry axis; and selecting the row coordinate with the minimum difference sum as the projection position of the rotating shaft in the Y direction of the detector. According to the method, high-precision positioning is realized through symmetry analysis of the projection superposition image, a die body does not need to be calibrated, the stability of a calculation result is remarkably superior to that of a traditional technology, and the definition of a reconstructed image is effectively improved.

The present invention discloses a blind frequency offset estimation method for OQPSK signals based on differential constellation trajectory diagrams. This method includes three parts: differential constellation trajectory diagram generation, symmetry axis estimation, and frequency offset estimation. The receiving end knows the symbol rate of the signal, performs even multiple oversampling, and does not require information such as training sequences for synchronization processing. The receiving end performs specific non-linear processing on the received signal, then performs differential processing at a certain differential interval, and projects it onto the complex plane to generate several differential constellation trajectory diagrams. Then, the receiving end estimates the symmetry axis and measures the symmetry of each differential constellation trajectory diagram, and selects the symmetry axis of the differential constellation trajectory diagram with the best symmetry as the final symmetry axis estimation result. Finally, the receiving end obtains the blindly estimated frequency offset value based on the specific relationship between the symmetry axis and the frequency offset, the differential interval, and the sampling rate. The invention can be used for frequency deviation estimation of systems adopting OQPSK modulation methods such as IEEE 802.15.4.

The application discloses a kind of construction curve generation method, including the following main steps: S1, the first arch of standard cycloid is selected as the basis arc segment of construction curve half section;S2, the second arch of standard cycloid is copied after mirror image with straight line y=2r as the axis of symmetry, and the basic unit of construction curve is obtained;S3, the basic unit obtained in S2 is copied 2 (n-1) along the positive direction of x axis, and then copied 4 (n-1) r along the positive direction of y axis, that is, the nth basic unit (n=2, 3, 4, 5,...) of construction curve can be obtained, and the curve formed by the connection of the n basic units forms a complete construction curve.The application also discloses a flow channel structure and a printed circuit board heat exchanger.The application can improve the average rate of medium flow, reduce the flow dead space in the transition area of wave crest and wave trough, enhance the disturbance of fluid medium in the channel, thereby destroying the flow heat transfer boundary layer to achieve the purpose of heat transfer enhancement.

The application discloses a kind of musical instrument audio signal intelligent analysis methods based on clancy figure, it is related to musical instrument manufacturing technical field, steps include: obtaining clancy figure, extracting symmetry axis angle distribution and wood texture main direction and obtaining offset angle;Wood texture anisotropic distribution area is identified based on offset angle, determine abnormal resonance energy propagation path, combine edge detection calculation panel vibration uniform area ratio, obtain resonance frequency purity percentage;With offset angle, correlation strength is constructed, input preset mapping obtains length-width modulus ratio fusion result, combined with finite element simulation to obtain panel cutting angle adjustment amount;According to adjustment amount, update modulus ratio, geometric symmetry coverage area ratio and energy dissipation space position distribution;Compare distribution before and after optimization, evaluate abnormal resonance amplitude reduction and symmetry axis angle distribution, determine the matching relationship and optimization direction of texture and symmetry axis, output final cutting angle scheme.

The invention relates to the technical field of image processing, and discloses a two-dimensional image reflection symmetry detection method and system, a terminal and a storage medium, and the method comprises the steps: obtaining an original image in a preset data set, carrying out the preprocessing and asymmetric region denoising processing, and obtaining an asymmetric region denoising feature map; performing rotation processing on the original image to obtain a target rotation image score graph; calculating the rotation loss between the target rotation image score graph and the asymmetric region denoising feature graph, and obtaining a reflection symmetry axis prediction feature graph according to the rotation loss; and carrying out binary mask fusion processing and probability Hough transform processing on the reflection symmetry axis prediction feature map to obtain an image reflection symmetry axis. According to the invention, the asymmetric region denoising processing is carried out on the preset data set to obtain the asymmetric region denoising feature map, and the rotation loss between the asymmetric region denoising feature map and the target rotation image score map is calculated, so that the accuracy of image reflection symmetry axis detection can be effectively improved.

Embodiments of the invention provide a two-dimensional code which comprises a plurality of optically readable and distinct indicia which are arranged on a two-dimensional area, wherein the indicia include a reference indicium and further includes at least one data indicium which represents at least one data value respectively, wherein the at least one data value is represented by at least one distance between the reference indicium and the at least one data indicium, and at least one angular displacement of the at least one data indicium which is relative to a reference direction, and wherein the reference direction is based on at least one of the indicia which is asymmetric or includes at most one line of symmetry.