221results about How to "Avoid angles" patented technology

The present invention provides a method for generating a three-dimensional (3D) building model based on photographed house type image identification. The method is used for solving the problem conventional house-type-image-based 3D reconstruction methods are not suitable for photographing-version house type images. Aiming at characteristics of a photographing- version house type image, correction treatment is first carried out on the photographing- version house type image, thus to enable the quality of the corrected image to be similar to that of an electronic-version house type image, thereby bringing convenience for follow-up house type image identification; carrying out wall body identification according to the characteristics of the photographing-version house type image, and carrying out size correction and closing of wall bodies, and generating a cross-platform JSON file; and ultimately using wall body information of the JSON file by Unity3D to carry out 3D reconstruction. With adoption of the method provided by the present invention, identification of photographed house type images is realized, the 3D building model is generated, the problem that the photographed house type image is inclined can be effectively solved, a wall body calculating method based on wall body intersecting anchor points is provided, and thus the following generated 3D wall bodies can be conveniently freely pulled and stretched based on the anchor points.

The invention discloses an independent tobacco cutting process and independent tobacco cutting equipment based on paper making method regenerated tobacco leaf processing characteristics. The process comprises the following process steps: opening a box, shoving tobacco leaves, loosening, regaining moisture, cutting, drying and mixing. The equipment comprises a box opening machine, a tobacco leaf shoving machine, a high-frequency-vibrating loosening machine, a moisture regaining machine, a cutting machine and a roller cut tobacco drying machine, wherein the mechanisms can be arranged and can operate alone or in combination through the connection by a material conveying and feeding mechanism. The process and the equipment can cut the boxed regenerated tobacco leaves independently according to the processing characteristics of the boxed regenerated tobacco leaves, thereby improving the effective utilization rate of the paper making method regenerated tobacco leaves, effectively retaining fragrance, improving visual quality, and making the prepared regenerated cut tobacco uniform in length and good in looseness so that the cut tobacco can be blended with other cut tobacco uniformly. The process and the equipment have high adaptability; meanwhile, according to the change in the form of supplied materials, 'three-step method' tobacco cutting adopted in the prior art is changed into one-step cutting with the same effect, the production efficiency is improved and the production cost is lowered.

The invention discloses a fast sparse Bayesian learning based direction-of-arrival estimation method and mainly solves the problems of heavy computation and large location estimation error in the prior art. The method includes the implementation steps: (1) adopting antenna receivers to form a uniform linear array; (2) sampling space signals and computing an array covariance matrix R; (3) vectorizing R to obtain a sparse model vector y; (4) dividing space domain grids, and constructing an over-complete base phi(theta) according to the structure of the sparse model vector y; (5) establishing a sparse equation according to the sparse representation relation of the sparse model vector and the over-complete base; (6) defining a hyper-parameter vector alpha, and adopting a fast sparse Bayesian learning algorithm to solve the sparse equation; (7) drawing a magnitude spectrogram according to an optimal estimation value of alpha to obtain a direction-of-arrival value. By the method, estimation accuracy of target reconnaissance and passive location under the conditions of low signal to noise ratio and small snapshot number is improved, computational complexity is lowed, and the method can be applied to target reconnaissance and passive location.

The invention discloses a corn directional seeding method, a directional seed block manufacturing equipment and a device for seeding seed blocks, which aim to overcome the phenomenon that corn leavesare mutually interfered and shield sunlight, and enable the spreading direction of the leaves to be consistent and vertical to a ridge direction to improve planting density and yield. The method comprises the following steps: firstly manufacturing seed strips consistent to biological characteristics of corns, and directionally loading seeds onto carriers for directional seeding; and making germ surfaces of the seeds loaded onto the carriers parallel to the ridge direction, germs vertical to the ridge direction, tops of the seeds upward and the germ surfaces facing outsides of the seed blocks.The carrier seed block manufacturing equipment has the following structure: a directional module is arranged in a hole of a seed block template; the inside of the directional module is provided with aseed positioning slot hole and a seed pushing mandrel; a seed strip box and a feeding device are arranged above the seed block template; the height difference is controlled to complete seed positioning, material filling and demoulding. The device for seeding the seed blocks comprises a seed block passage, a seed feeding mechanism, a colter and a seed block charging mechanism. The method, the equipment and the device overcomes the defect that the leaves are disorderly arranged, and can greatly improve corn planting density to improve the yield and show the advancement of precision agriculture.

The invention discloses a direction of arrival angle estimation method based on Sparse Bayesian learning. The direction of arrival angle estimation method mainly solves the problems in the prior art that the computation burden is heavy, the performance of the coherent signal source process is poor, and the errors in the passive location estimation are big. The direction of arrival angle estimation method comprises the following steps: (1) using an antenna receiver to form a uniform linear array, and sampling space signals to obtain observation data, (2) converting the observation data into real values and calculating a covariance matrix, (3) carrying out the mesh generation on airspace, and constructing a real value over-complete base, (4) establishing a sparse matrix equation according to the sparse presentation relationship of the covariance matrix and the over-complete base, (5) obtaining a most sparse solution of an unknown matrix variance through solving a matrix equation by employing the Sparse Bayesian learning, (6) drawing an amplitude spectrogram based on the one-to-one corresponding relation between the spares solution and the space angle, and obtaining the direction of arrival angle degree. According to the direction of arrival angle estimation method, the passive direction-determination calculating speed and the estimation performance on the signal direction angle when in fast and low number of beats are improved. The direction of arrival angle estimation method is applicable to the target reconnaissance and the passive direction-determination.

The invention belongs to the technical field of data processing, and provides a moving object shooting method based on a mobile terminal, and the mobile terminal. In the embodiment of the invention, the mobile terminal is provided with at least one first image acquisition device and at least one second image acquisition device, wherein the first image acquisition device is used for image acquisition in a static status, and the second image acquisition device is used for image acquisition in a multi-directional rotation status. The method comprises the following steps: starting the first image acquisition device and the second image acquisition device; obtaining movement data of a moving object captured at least by the first image acquisition device; generating shooting parameters of the second image acquisition device according to the movement data; and controlling the second image acquisition device to shoot a picture of the moving object according to the shooting parameters. The method and the mobile terminal provided by the invention have the advantages that the implementation cost is low; the picture of the moving object, in which a target is clear but a background is ambiguous, can be shot by a user through ''foolproof'' operation, and no special shooting skills are needed, so that the operation is simple, and the use is convenient.

The invention discloses a direction-of-arrival estimation method based on sparse representation. The method mainly solves the problems that because a similar technology is large in calculation amount and low in angular resolution, the estimation speed of target reconnaissance and passive location is low and estimation errors in target reconnaissance and passive location are large. The method comprises the implementation steps: (1) acquiring output signals of an array and calculating a covariance matrix R of the signals, (2) constructing reconstructed sparse vectors through lower triangular elements of the covariance matrix R, (3) carrying out mesh generation on a spatial domain to construct a perfect base, (4) converting the direction-of-arrival estimation issue into the issue of solving a constrained optimization equation according to the sparse representation relation between the reconstructed sparse vectors and the perfect base, (5) solving the constrained optimization equation according to the convex optimization method to obtain the optimal estimation vectors, (6) drawing a magnitude spectrum according to the one-to-one correspondence of the optimal estimation vectors and spatial domain angles to obtain the direction-of-arrival value. By means of the method, the calculation speed of target reconnaissance and passive location is decreased, and the estimation errors in target reconnaissance and passive location are reduced. The method can be applied to target reconnaissance and passive location.

The invention discloses a compressed sensing-based multi-input and multi-output radar two-dimensional angle estimation method. The main objective of the invention is to solve the problems of low accuracy and large computation amount in MIMO (multi-input and multi-output) radar two-dimensional angle estimation in the prior art. The method includes the following steps that: 1) a uniform linear array model is established, and uniform array output signals are obtained; 2) a direction of arrival output uniform linear matrix and an emission angle output uniform linear matrix are respectively constructed through the output signals, and a direction-of-arrival covariance matrix and an emission angle covariance matrix are calculated; 3) a direction of arrival observation vector and an emission angle observation vector as well as a direction of arrival fitting error and an emission angle fitting error are respectively constructed through the elements of the direction of arrival covariance matrix and the emission angle covariance matrix, and a direction of arrival super complete set and an emission angle super complete set are constructed; and 4) the optimal sparse solution of the directions of arrival and the optimal sparse solution of emission angles can be calculated according to the spare relationship between the direction of arrival and emission angle observation vector and the direction of arrival and emission angle super complete set, and a direction of arrival amplitude spectrogram and an emission angle amplitude spectrogram are drawn. With the method of the invention adopted, the operating rate of passive direction finding and angle estimation accuracy under a low signal to noise ratio can be improved. The method can be used for target detection and passive location.

The invention discloses a camera testing device which comprises a video set providing videos, a camera and a fixing device for the camera. The camera testing device further comprises a lens set which is disposed between the video set and the fixing device and is used for simulating different shooting distances. Different distances can be simulated to test focusing imaging effect of the camera by adjusting the lens set with no need of moving the camera or the video set. Therefore, differences between factors such as light and angle caused by moving of the camera or the video set are avoided, repeatability and standard of tested images are increased, and accuracy in judging imaging effect of the camera is increased. These effects are achieved just by simply adjusting the lens set with no need of continuously correcting the factors such as light and angle during shooting, time and labor are saved, accuracy is guaranteed and efficiency is improved greatly.

The invention discloses a multi-curvature forming method for a stainless steel cylinder. The method is characterized by comprising the following steps: performing scribing and blanking according to the developed length of the medium diameter of a cylinder to be wound; machining peripheral welding grooves of a plate; rolling-forming a first-curvature circular arc, namely reserving a straight section, not to be wound for the formation of a circular arc, with a width B of 200 to 600 mm at each of the two ends of the cylindrical plate, and bending and winding the middle part of the cylindrical plate into a large circular arc with a curvature radius R of more than or equal to 0.5 Phi to form the first-curvature circular arc of the cylinder; rolling-forming second-curvature circular arcs, namely rolling the parts between the roots of the straight sections with the widths B of 200 to 600 mm and the large circular arc into circular arcs with curvature radiuses r of 0.2 to 0.5 Phi to form second-curvature circular arcs; rolling transition parts between the second-curvature circular arcs and the first-curvature circular arc into smooth transition; performing rolling until the grooves 2 in the two ends of the straight sections get close to each other; performing longitudinal seam assembly and welding on the cylinder, placing the cylindrical body at a horizontal position, and welding longitudinal seams; performing roundness correction on the cylinder after welding.

The invention provides a flanging mould, an assembling mould, a paving method and a moulding method of a moulding material. The flanging mould comprises a unibody mould surface, the mould surface comprises a sharp embossment, and the mould surface is divided by the climax of the sharp embossment into a first curved surface and a second curved surface. During the moulding process, the first curved surface is laminated with the film-forming material of the turn-up part of the external flanging so as to form the shape of the turn-up part; and the second curved surface is laminated with the film forming materials of partial web body and internal flanging. A combination of two flanging moulds and a plate mould is adopted so as to integrally forming the external flanging, web body, and internal flanging. The problem that the flanging angle of an I-shaped web, which is flanged manually, is not accord with the design map is avoided. Moreover, the defects such as foams, layering, and bright spots in the corner are reduced.

The invention discloses a large axial flow fan unbalance recognition method based on auto-correlation. The method includes that: 1) assuming that the vibration of an axial flow fan is caused by unbalance, the ratio of the amplitude of the power frequency signal of the axial fan vibration signal and the amplitude of other frequency signals is defined to be more than or equal to two, and the sampling length is more than the rotational speed signal cycle; 2) low-pass filtering is performed on the axial flow fan vibration signal; 3) dual auto-correlation is carried out to separate the power frequency component from multiple frequency components of the axial flow fan vibration signal; 4) effective value is computed to restore the amplitude of the power frequency component of the axial flow fan vibration signal; and 5) the amplitude measuring method is adopted for dynamic balancing to determine the size and position of the unbalance mass of the axial flow fan. The invention can effectively separate the unbalance vibration amplitude component from a complicated vibration signal on the premise that the key-phase signal is not extracted, finally locates the unbalance size and position of the axial flow fan through amplitude measuring balance method and has greater engineering application value.

The invention provides a microwave photon array-based ultra wideband signal direction of arrival estimation method, so as to solve the technical problems of low ultra wideband signal direction of arrival estimation efficiency and low estimation precision existing in the prior art. The method comprises steps: 1) a first-order sideband signal E0(t) is acquired; 2) a microwave photon array D is built; 3) the light power Pm of an ultra wideband signal Em outputted by the microwave photon array D is acquired; 4) a light power ratio vector Q is defined; 5) an M*Ntheta-dimension matrix as described in the specifications related to an array flow pattern vector as described in the specifications is defined; 6) the phase phim of the ultra wideband signal Em outputted by the microwave photon array Dis acquired; and 7) the direction of arrival thetam of the ultra wideband signal Em outputted by the microwave photon array D is calculated.

An imaging lens includes, from the object side to the image side, an aperture stop, a first lens with positive refractive power having a convex object-side surface near an optical axis, a second lens with positive refractive power having a convex image-side surface near the axis, a third lens with positive refractive power having a convex image-side surface near the axis, and a fourth lens with negative refractive power having a concave image-side surface near the axis, wherein all lens surfaces are aspheric, all lenses are made of plastic material, a diffractive optical surface is formed on at least one of the lens surfaces from the first lens image-side surface to the second lens image-side surface, and at least one of the three positive lenses satisfies expression (1):

1.58<Ndi  (1)

• • where
  • Ndi: refractive index of the i-th positive lens at d-ray.

The invention provides a travelling track construction method, a travelling track construction device, a computer system and a readable storage medium, wherein the method comprises the steps that: electronic equipment obtains original track data; the electronic equipment performs clustering according to the position data and the serial number of each position point in a position point sequence inthe original track data, so that multiple position point sub-sets are obtained; for each position point sub-set, a part of position points in the position point sub-set are selected as characteristicposition points; the start point and the end point of the position point sub-set are determined; according to the start point and the end point of each position point sub-set, a representative point universal set is determined; position points, which are positioned or roughly positioned on a linear track in the representative point universal set, are determined; a key point set is determined according to the representative point universal set and the position points, which are positioned or roughly positioned on the linear track; and the travelling track is constructed according to the key point set. By means of the technical scheme in the invention, the travelling track can be constructed more simply and accurately.

A lateral displacement and pivot steering system of an automobile relates to the field of automobile design manufacture and is characterized in that a set of support and driving system composed of hydraulic telescopic cylinders, bearing trundles, pressure bearings, two-way hydraulic motors and a hydraulic telescopic arms is installed on a bearing support of an automobile chassis by utilizing the hydraulic transmission principle. A bearing trundle direction adjusting plate is fixed on a telescopic rod of the hydraulic telescopic cylinder, and two ends of resetting springs are respectively connected with the adjusting plate and the bearing trundle to form a direction adjusting system. The lateral displacement and pivot steering system changes the direction of an oil path and oil flow through different actions of an electromagnetic valve and is capable of enabling the automobile to achieve 90-degree lateral displacement and pivot steering of any angle within 360 degrees.

The invention relates to the field of raman spectrometer, in particular to a medium-stepped grating type spatial heterodyne raman spectrometer optical path structure. Two middle-step gratings (or onemiddle-step grating and one plane reflector) are adopted, and a spatial heterodyne interference effect is generated to realize spatial heterodyne raman spectrum measurement, so that the problems of low measuring efficiency, low resolution and small visual field broadening angle due to the fact that a moving part is generally arranged in a traditional fourier transform raman spectrometer are solved. The use level N of the middle-step grating is larger than 1. Under the condition that the range of the total measuring wave band of the raman spectrum of an optical path remains unchanged, the morethe use level N of the middle-step grating is, the higher the raman spectrum resolution of the optical path structure is. The back scattering raman spectrum of a sample can be measured, and the transmission raman spectrum of the sample can also be measured.

The invention discloses a two-dimensional arrival direction testing method based on wave beam space conversion, and is applicable to a method for testing a non-coherent signal two-dimensional arrival direction of a large-scale MIMO system. The two-dimensional arrival direction testing method comprises the following steps: setting a uniform matrix array with M antennas, and performing wave beam space conversion on received data; establishing a covariance matrix of a conversion vector; acquiring a signal sub-space through the covariance matrix; acquiring a corresponding generalized selection signal sub-space according to characteristics of wave beam space conversion and an array structure; then, acquiring a rotation matrix; and finally, respectively confirming a pitch angle and an azimuth angle of a signal source. The two-dimensional arrival direction testing method has relatively small testing errors in a large-scale MINO scene, and non-linear optimization and angle search are avoided. Therefore, the two-dimensional arrival direction testing method has the advantages of being high in precision, low in data processing complexity and the like, and the performance and practical values of the system can be effectively improved when the two-dimensional arrival direction testing method is applied to the large-scale MIMO system.

The invention relates to a multi-axial carbon fiber yarn zero-degree threading device, which comprises a creel and a first guide mechanism at the yarn outlet end of the creel, wherein a first yarn transition support and a second yarn transition support are sequentially arranged at one side of the creel, a second guide mechanism is arranged on the first yarn transition support, a third guide mechanism and a guide plate which is positioned behind the third guide mechanism are arranged on the second yarn transition support, at least a first line of guide holes and a second line of guide holes which is positioned below the first line of guide holes are arranged in the guide plate, both the first and the second lines of guide holes comprise a plurality of guide holes with the same space, and the right end of the first guide hole in the first line of guide holes is vertically intersected with the left end of the guide hole which is in the second line of guide holes and corresponds to the first guide hole; and a jacking device is arranged below the creel, the carbon fiber yarn comes out from the creel to a knitting machine, the device can prevent the surface of the carbon fiber yarn fromgenerating broken filaments, when the carbon fiber yarn enters the knitting machine, no clearance is left between the adjacent carbon fiber yarns, so the knitting quality of a carbon fiber yarn knitting product is improved.

The invention provides a spatial heterodyne Raman spectrometer optical path structure. The spatial heterodyne Raman spectrometer optical path structure comprises a collimating lens, a Raman optical filter, a short-wave pass filter, an interferometer assembly, an imaging lens group, and plane-array detector; the interferometer assembly comprises a beam splitter mirror, two prisms, and two optical gratings; the prisms are symmetrically arranged on two arms of the interferometer assembly; the optical gratings are symmetrically arranged on two arms of the interferometer assembly with a certain angle; each optical grating is composed of n sub-optical gratings, and n is equal to or larger than 2; the n sub-optical gratings can be arranged in different groove spacing. Compared with structures with only one sub-optical grating (n=1), the spatial heterodyne Raman spectrometer optical path structure possesses a following advantage: n times Raman spectrum measuring wave band rang is achieved. Thespatial heterodyne Raman spectrometer optical path structure contains no moving part, so that problems in conventional Fourier transform Raman spectrometers that measuring efficiency is low, and spectrum resolution ratio is low are solved, Raman spectrum high resolution ratio measuring in different wave bands can be realized, and excellent view field broadening capability is achieved.

A coaxial connector suitable for high frequency applications is provided. The main body of the connector has an annular groove. A bayonet sleeve is provided at least partially slidably overlying the main body and having a recess groove at least partially corresponding to the annular groove in the main body. A biasing mechanism biases against the main body and the bayonet sleeve and is preferably disposed in the annular and recess grooves. The biasing mechanism exerts biasing force in a longitudinal direction of the connector to maintain the relative longitudinal position of the bayonet sleeve with respect to the main body. Because of the overlap of the bayonet sleeve and the main body acting in conjunction with the biasing mechanism, the bayonet sleeve is maintained in a stable, straight configuration, and signal loss or degradation is minimized.