549 results about "Reference line" patented technology

The invention relates to a czochralski method-based crystal growth interface shape detection method and device. The method comprises the steps that: a seed crystal temperature T and an interface electromotive force U at the same time in a crystal growth process are collected, and a T-U curve of the interface electromotive force U changing with the seed crystal temperature T is obtained; the change trend of the shape of a crystal growth interface in real time is judged by observing the deviation between the T-U curve and a reference line, wherein the reference line is a straight line passing through the starting point of the T-U curve, and the slope of the straight line is the Seebeck coefficient of the crystal. The invention also relates to a device used by the method. The detection method provided by the invention can detect the change trend of the shape of the crystal growth interface in real time in the crystal growth process, and can be applied to Czochralski method growth equipment for various single crystals such as lithium niobate, lithium tantalate, sapphire, yttrium aluminum garnet and the like.

A road longitudinal slope estimation method based on unmanned aerial vehicle aerial photography video includes: collecting and correcting the traffic flow video of the road; taking the center line of the road as the reference line, extracting pixels on the reference line, and outputting the pixel gray space-time image on the reference line; performing the contour extraction of pixel gray space-time image; through the trajectory contour information, obtaining the complete trajectory data set; identifying the vehicle speed change point by using the energy distribution of wavelet transform; constructing the data set of road slope estimation, and based on the assumption of the actual length distribution of road pixels and the value of road longitudinal slope, applying a Bayesian network and a machine learning algorithm to iteratively obtain an expected value and variance of the actual length of the road pixel point and an estimated value of the road longitudinal slope.

In various examples, a simulation platform generates a simulated driving environment by processing road map data to derive the location of wear-related visual artifacts for sections of a lane surface. Using map data, the simulation platform generates texture maps for aesthetic road rendering, which are used to apply textures to a 3D polygon topology mesh. The simulation platform generates visual artifacts representing the wear and tear of the road surface based on a calculation of one or more lane feature distances derived from the map data. The simulation platform calculates distances associated with reference line data derived from an image to render a texture of one or more lane features.The spacing is used to determine how the appearance of the texel is adjusted to include wear-related visual artifacts when displayed on a lane of the simulated driving environment.

The present application relates to a kind of method and device for judging the trend of concrete oblique crack tip, fill metal powder in the crack to be measured;Determine the beginning and end point of crack trend according to the opening trend of crack surface to be measured, draw the center line of the connecting line of beginning and end point as the first measuring line, respectively from the two end points of the first measuring line along the first measuring line to crack opening position detection using electromagnetic wave radar detector, record the position and depth of the first fluctuation point on radar development map;With the first measuring line as reference line, rotate to make several new measuring lines, obtain the position and depth of the first fluctuation point of each new measuring line;Fluctuation point is sorted according to measuring line sequence, draw the connecting line diagram, i.e. the trend curve of oblique crack tip.The present application is based on the essential characteristics such as the height and form of oblique crack tip position, combined with the measurement mode from far to near, multi-angle, multiple measuring points and the reflection law of radar wave by metal powder, the position and depth of multiple points of concrete oblique crack tip are measured, and then the trend of crack tip is effectively judged.

The invention relates to the technical field of automatic driving, and discloses a tramcar path planning method, device and equipment based on a reference line and a storage medium. According to the method, an improved A * search algorithm is combined with reference line discretization and smoothing processing, the node expansion number is reduced, the path smoothness is optimized, and the tramcar path planning efficiency is improved. Meanwhile, a double-factor heuristic function and dynamic constraint verification are utilized to ensure that the path is safe and feasible, and the method has the advantages of improving path planning efficiency, reducing path fluctuation, meeting special terrain and dynamic constraint requirements of a mining area and ensuring that the mine car stably travels along a predetermined reference line.

The invention provides a ground satellite signal distributed cooperative processing method and system, and relates to the technical field of communication, and the method comprises the steps: extracting a user MAC address hash value, an emergency priority code and a spectrum occupancy matrix from a synchronous network, and generating a triple feature vector; transmitting the triple feature vectors through a double-layer Mesh network, selecting two reference target points with fixed geographic coordinates on the ground of the disaster area, obtaining three-dimensional coordinates of the reference target points, and constructing a space reference straight line; according to the real-time position data of each node, calculating a vertical projection distance from each node to the space reference straight line, and generating a node offset parameter; and dynamically generating a refraction correction coefficient of the signal propagation path based on a comparison result of the node offset parameter and a preset threshold value, and when the offset exceeds the threshold value, increasing a correction weight by adopting a piecewise linear interpolation method. According to the invention, high-reliability and low-delay emergency communication coverage can be realized.

The application relates to the technical field of automatic driving of vehicles, and provides a vehicle obstacle avoidance trajectory planning method, a vehicle obstacle avoidance trajectory planning system, a vehicle and a storage medium.The method comprises the following steps: obtaining coordinate point information of a lane line and coordinate point information of a lane center line according to vehicle positioning information; taking the lane center line of the lane where the vehicle is located as a reference line, and converting the position, heading, speed and acceleration of the vehicle into a longitudinal position, a lateral offset, a lateral speed, a longitudinal speed, a lateral acceleration and a longitudinal acceleration in a frenet coordinate system; taking obstacle information, if there is an obstacle, converting the obstacle coordinates into S obs ,L obs , if there are multiple obstacles, converting the coordinates of each obstacle into S obsi ,L obsi , and calculating a target point through dynamic programming by means of point sampling; converting the target point into coordinates in a natural coordinate system, smoothing the coordinates through a smoothing algorithm to obtain a trajectory point set, and fitting the trajectory point set to generate a trajectory equation. The application has a simple calculation process and lower cost.

The invention discloses a method for generating a reference line in vehicle driving path planning and electronic equipment, and the method comprises the steps: obtaining initial data corresponding to an automatic driving vehicle, the initial data comprising driving map information, historical driving track information and vehicle parameter information; preprocessing the initial data to obtain target data; according to the target data, constructing boundary constraint information required by optimization based on the environment information; according to the initial reference line and the target boundary constraint information, generating target input information corresponding to a target reference line optimizer, and inputting the target input information to the target reference line optimizer, so that the target reference line optimizer performs reference line optimization processing according to the target input information to generate corresponding target output information, the target output information comprises a target reference line of the autonomous vehicle corresponding to a target driving road in the driving environment. Therefore, the reasonability and accuracy of the reference line can be improved.

The invention discloses a multi-view three-dimensional reconstruction driven cattle body size online measurement method, and relates to the technical field of animal husbandry three-dimensional measurement, and the method comprises the steps: extracting a ground reference plane, a segment elevation function, a guardrail reference line, a segment guardrail spacing, a periodic pitch and a hoof ground contact event, and generating a calibration opportunity score in combination with a pixel-level quality weight map; in the sliding window factor graph, jointly solving an external parameter rotation matrix, an external parameter translation vector and a global scale by taking the prior as a constraint, and outputting an uncertainty matrix; implementing hierarchical self-recovery according to the comprehensive health degree and the score, and replacing safe writing with double buffer atoms; carrying out weighted splicing under a unified measurement coordinate and carrying out profile robust measurement, forwards transmitting uncertainty to a body size layer and supporting individual multi-time column-passing convergence; the method is suitable for channel visibility interruption and structure variable scenes, and under the condition of uninterrupted release, measurement consistency is kept and auditable results are output.

Proximity-based surface texture generation for simulated environment systems and applications is disclosed. In various examples, a simulation platform generates a simulated driving environment by processing road map data to infer locations of wear-related visual artifacts for portions of a roadway surface. The simulation platform uses the map data to generate texture maps for aesthetic road rendering, which are used to apply texture to the 3D polygon topology mesh. The simulation platform generates visual artifacts representing use and wear of the roadway surface based on calculating one or more distances from roadway lane features derived from the map data. The simulation platform calculates a distance from the one or more roadway lane features associated with reference line data derived from the image to render the texture. The distances are used to determine how to adjust the appearance of texels to include wear-related visual artifacts when rendering wear-related virtual artifacts on the roadway of the simulated driving environment.

The invention discloses a center line calibration device and method for a sizing mill main rack. The center line calibration device comprises a first tool assembly arranged at one end of the main machine frame, a second tool assembly arranged at the other end of the main machine frame, an emitter arranged on the first tool assembly and a second receiver arranged on the second tool assembly, a first receiver is arranged on the first tool assembly, and a second receiver is arranged on the second tool assembly. The transmitter and the receiver are arranged at the two ends of the first tool assembly respectively, a first base plate is arranged between the bottom of the roller rack and the main rack, and a second base plate is arranged between the side wall of the roller rack and the main rack. According to the method, it is ensured that the datum line deviation is controlled at the micron-order initial precision, a datum origin is provided for follow-up calibration, the problem that the coincidence precision is insufficient due to the fact that the datum is fuzzy in a traditional method is solved, the center line coincidence precision can be strictly controlled within 0.2 mm, and the precision requirement for high-end seamless steel pipe production is met.

The invention discloses a nonlinear path planning method for a melt electrostatic direct writing stent guided by micropore characteristics, and relates to the technical field of additive manufacturing. Comprising the following steps: according to design requirements, defining binary functions L (x, y) and W (x, y), and respectively controlling spatial distribution of pore length and width of micropores; an XY plane is divided into orthogonal reference line grids through two groups of equidistant reference lines parallel to an X axis and a Y axis, namely an X (y) line and a Y (x) line, and each reference line can determine an upright plane, namely an X (y) plane and a Y (x) plane; and then determining geometric intersection points of the L / 2 (x, y) and W / 2 (x, y) function curves and an X (y) plane and a Y (x) plane determined by the reference line as path intersection points by using zigzag broken lines, after all the intersection points are obtained, sequentially connecting the intersection points to obtain a designed nonlinear path, and carrying out feasibility verification on the generated nonlinear path. The method provides a parameterized solution for micro-structure bionic design of the MEW stent, and is suitable for stent manufacturing with complex tissue regeneration requirements.

Measuring device (100) for measuring a resistance-dependent measured quantity (T) on or in an optical system (10) of a lithography system (1), comprising: a current source (106) for generating a measuring current (I), a measuring line branch (114) and a reference line branch (116), a switching unit (118) for selectively connecting the power source in a reference switching position (120) to the reference line branch or in a measuring switching position (122) to the measuring line branch, a connection unit (126) arranged on the measuring line branch for optionally connecting a measuring resistor (104) or at least one calibration component (128, 130) electrically, a reference resistor (132) arranged on the reference line branch, a voltage sensing unit (136) for sensing a voltage (U R , U M) optionally on the reference line branch or the measuring line branch, and a control unit (112) for determining a parasitic resistance value (R) P ) the measuring device based on a reference voltage (U) detected in the reference switching position (120). R ) and a measured voltage (U) detected in the measuring switching position (122) in which one of the at least one calibration component (128, 130) is connected to the connection unit (126). M ).

A method of and an apparatus for controlling intra prediction for decoding of a video sequence are provided. The method may include based on a reference line index signaling a first reference line nearest to a coding unit, among a plurality of reference lines adjacent to the coding unit, applying intra smoothing on one or more first reference lines comprising the first reference line, among the plurality of reference lines, and based on the intra smoothing being applied on the one or more first reference lines, applying a position-dependent intra prediction combination (PDPC) on one or more third reference lines comprising the first reference line, among the plurality of reference lines, while preventing application of the PDPC on one or more fourth reference lines other than the one or more third reference lines, among the plurality of reference lines.

In the embodiments herein, an instrument for level and plumb determinations, includes: a sealed chamber of equal dimensions made from transparent or translucent material marked with center lines and filled with a colored fluid, so when placed on any surface. Relative to the orientation of the surface to the face of the earth, the instrument reveals if a surface is: plumb within an upright position; level within a horizontal position; or at an angle, which can be marked and transferred. Reference lines are placed exactly parallel and centered to the sides and ends.

The invention relates to a measuring device (100) for measuring a resistance-dependent measurement variable (T) on or within an optical system (10) of a lithography system (1), said measuring device comprising: a current source (106) for generating a measurement current (I); a measurement line branch (114) and a reference line branch (116); a switching unit (118) for selectively connecting the current source, in a reference switching position (120), to the reference line branch, or, in a measurement switching position (122), to the measurement line branch; a connection unit (126) arranged on the measurement line branch for selectively electrically connecting a measuring resistor (104) or at least one calibration component (128, 130); a reference resistor (132) arranged on the reference line branch; a voltage detection unit (136) for detecting a voltage (UR, UM) selectively across the reference line branch or the measurement line branch; and a control unit (112) for determining a parasitic resistance value (RP) of the measuring device based on a reference voltage (UR) detected in the reference switching position (120) and a measurement voltage (UM) detected in the measurement switching position (122), in which one of the at least one calibration component (128, 130) is connected to the connection unit (126).

The invention provides a method for measuring the position of a welding seam by using a Leeb hardness tester. Comprising the following steps that firstly, a theoretical position line of the center of a welding bead is drawn according to a reference positioning datum; secondly, two datum lines parallel to the theoretical position line of the center of the welding bead are drawn out; thirdly, weld bead excess weld metal or protrusions at the measuring positions on the two sides of the center line are polished and removed; step 4, a measurement position line is drawn between the two datum lines, the measurement position line is perpendicular to the two datum lines, and a measurement point is drawn on the measurement position line every 3mm; step 5, measuring the hardness of each measuring point by using a Leeb hardness tester, wherein each measuring point is measured for more than three times; analyzing an average value of measurement data of each measurement point, and drawing a hardness-position curve graph according to a position corresponding relation; obtaining the position and boundary dimension information of the welding seam according to the measurement position point by comparing the hardness change area; and more accurate position and boundary dimension information of the weld joint is obtained in a measurement point encryption mode.

A video decoder may be configured to determine that a block of video data is encoded using an intra prediction process that utilizes multiple intra prediction predictors; determine a set of reference lines for the intra prediction process; determine a first set of intra prediction predictors based on the set of reference lines; determine a second set of intra prediction predictors based on the set of reference lines; generate a fusion of predictors from the first set of intra prediction predictors and the second set of intra prediction predictors; and decode the block of video data using the fusion of predictors.

The invention provides a parametric modeling method for a bridge support, and the method comprises the following steps: creating a spatial three-dimensional curve: creating the spatial three-dimensional curve of a design line; a project model file creation step: creating a support project model file; a horizontal curve creation step: creating a horizontal curve according to the spatial three-dimensional curve, and obtaining a cross section datum line; a calculation step: calculating coordinates of component placement according to the cross section reference line; and a placing step: placing the component according to the coordinates, and setting design parameters of the component. According to the method, parametric modeling of the bridge support is achieved, automatic arrangement and parametric generation are achieved, the manual modeling time is greatly shortened, and the modeling efficiency is improved.

The present invention discloses a continuous reference line decision method and device, the method comprising determining semantic information of a reference line, the determined semantic information comprising a first semantic information group for intention decision and a second semantic information group for direction decision; determining a reference line switching intention based on the first semantic information group; selecting an optimal reference line based on the reference line switching intention and the second semantic information group of each reference line; and determining a target reference line based on the selected optimal reference line. The solution of the present invention uses the semantic information determined for the reference line to make a reference line decision, which can ensure the rationality and reliability of the decision result; and applies part of the semantic information to perform decision analysis at each stage of the decision, which not only makes the decision process clear, intuitive and explainable, but also facilitates the flexible adjustment of the evaluation parameters of the decision analysis, i.e., the semantic information, according to the needs, thereby improving the debuggability and scalability of the reference line cost evaluation.

The embodiment of the invention provides a vehicle trajectory generation method and device, and relates to the technical field of path planning. The method comprises the steps of obtaining a first reference line of a target vehicle under the condition that the target vehicle needs to steer; based on the first reference line, a nonlinear vehicle kinematic model and a target function are constructed, the nonlinear vehicle kinematic model comprises a target state quantity determined based on the first reference line, and the target function comprises a penalty term related to the target state quantity; taking the first reference line as an initial solution of a nonlinear optimizer, and optimizing the target state quantity by using the nonlinear optimizer and taking minimization of the target function as a target to obtain an optimized reference line output by the nonlinear optimizer; and determining the optimized reference line as a target trajectory of the target vehicle. Therefore, the local track meeting the large-curvature road condition dynamics requirement can be generated, and the control precision and the driving smoothness in a limit steering scene are remarkably improved.

The application relates to the intelligent robot technology in the field of artificial intelligence, and discloses a robot position correction method and related equipment, the method comprising: acquiring a first actual distance of a robot and a reference line in a target direction and a first heading angle of the robot relative to the reference line, the reference line being a boundary line of a target object, the target direction being a vertical direction of the reference line, the first heading angle being an included angle between a moving direction of the robot and the reference line, and the target object being an object related to a task performed by the robot; and controlling the robot to move according to an expected distance of the robot and the reference line in the target direction, the first actual distance and the first heading angle, so that a second actual distance of the moved robot and the reference line in the target direction is the expected distance. The relative positioning technology is used with the reference line to realize the correction of the robot position, and an automatic position correction scheme of the robot in the moving process is provided.

An electronic device configured to project an image includes: an image projection unit comprising a projector configured to project the image onto a projection area, memory storing at least one instruction, and at least one processor, comprising processing circuitry, individually and / or collectively, configured to execute the at least one instruction stored in the memory and to: determine a reference line including information about a point in the projection area, the point being farthest from the image projection unit, generate a distance correction coefficient for correcting an input grayscale of an input image, based on the reference line, and control the image projection unit to display a corrected image including a corrected grayscale generated by multiplying the input grayscale by the distance correction coefficient.

The invention belongs to the technical field of visual sensors, and particularly relates to a gap measurement method which is used for describing a gap in a segmented manner, describing the whole gap based on a segmented manner, establishing a surface point cloud of the gap by using a fringe projection structured light three-dimensional measurement technology, and extracting a boundary point cloud of the gap by using a binocular fringe-free picture. Fitting the surface point cloud and the boundary point cloud to solve the problem of large noise point quantity at the boundary in the measurement process of the binocular fringe projection structured light system; and meanwhile, the reference plane and the reference line are fitted by depending on the existing point cloud data, so that the fitting error is reduced. On the basis of improving the gap measurement precision, the method can be suitable for measurement of complex gaps which are long and narrow in gap shape, have light pollution, have low-frequency micro-amplitude vibration, have external shielding and have dynamic non-uniform deformation in the length direction in the fields of aerospace, rail transit, precision manufacturing, heavy industry and the like.

A portable multipurpose subdivision graduation protractor comprises a main ruler, an auxiliary ruler and a precise hinge shaft unit. The main ruler is of a structure similar to a right triangle, two right-angle sides are main ruler arms, a bevel edge is replaced by a 135-degree fold line, and 45-degree, 135-degree and 90-degree external angles are provided and can be directly used as a fixed angle sample plate; the surface of the main ruler is provided with easily-identified fan-shaped distribution scales which are correspondingly arranged in two layers as difference reference lines; parallel step notches are formed in the upper edge of the vertical main ruler arm and are used for small-angle measurement; the auxiliary ruler is of a two-right-angle-side structure, the vertical side is an auxiliary ruler arm, and the auxiliary ruler can also be used as a fixed-angle sample plate. The horizontal side is a pointer arm, the end portion is of a fan-shaped structure, the radius is the same as that of the fan shape of the main ruler, and ruler reading visual errors can be reduced. Various interior angles can be widely measured and mapped, difference group scribed lines are effectively set, and an error conduction chain is shortened due to the fact that the whole ruler is not provided with redundant components. The precision machining problem is solved, and the measurement precision can be further improved.

1. The name of the product of this design: Laser Level (2). 2. Purpose of this design product: used to measure horizontal and vertical reference lines. 3. The key design point of this design product lies in the combination of shape and pattern. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The present application relates to the technical field of computers, and discloses a bone burring control method, a parameter processing method, and a device. The method comprises: constructing an area model of an area to be burred of a bone segment to be burred and a burr model of a burr for burring said area; determining a reference line on the basis of the morphology of the area model, and planning sampling points on the reference line; determining a burring path by means of the reference line, comprising: on the basis of the condition of intersection between the triangular meshes of the burr model and the area model, determining a vertical retraction height of each sampling point on the reference line in a coordinate system of said area, updating the vertical-axis coordinate of each sampling point on the basis of the vertical retraction height, and generating the burring path on the basis of the updated sampling points; and on the basis of the burring path, controlling a burr corresponding to the burr model to burr said bone segment. According to the method and apparatus provided by the present application, a burring path can be generated, and the jawbone is automatically burred along the burring path by means of a machine, thereby improving the burring precision.

The utility model belongs to the related technical field of automatic welding equipment, and particularly relates to a frame welding fixing device. A workbench is arranged, the workbench is provided with a first datum line and a second datum line, the first datum line and the second datum line are perpendicular to each other, and a first frame and a second frame are arranged on the workbench along the first datum line and the second datum line respectively; and at least one pushing mechanism is arranged to push the frame to the datum line, and the pressing mechanism is arranged to conduct automatic pressing, so that the pushing mechanism and the pressing mechanism are combined to fix the frame, the stability of the frame is improved, and therefore metal frame welding is conducted through the welding mechanism. By means of the frame welding and fixing device, automatic welding and fixing of the metal frame are achieved, so that the welding efficiency and stability are improved, the production cost is reduced, and the quality of welded products is improved.

The application discloses a kind of super-long part bending front feeding positioning device and method, belong to metal sheet precision forming manufacturing field, method is through high-precision measurement acquisition feeding platform surface full field data, constructs and bending mould center line alignment digitization platform surface model, and generates height constant equal to mould center line global reference line and static platform compensation mapping function.In feeding process, the trajectory deviation of the part bottom surface relative to the reference line is detected in real time using a non-contact displacement sensor array, the static compensation value is combined with feedforward-feedback composite control to drive the active leveling mechanism for vertical adjustment, and the static error and dynamic disturbance of the platform are simultaneously offset.The system continuously monitors the actual trajectory and triggers the instant adjustment mechanism when the deviation exceeds the limit.The application solves the problem of error accumulation in super-long part feeding by establishing a global unified reference, integrating static pre-compensation and dynamic closed-loop control, and constructing multiple verification, achieving high-precision positioning.

The invention relates to the technical field of optics, and discloses a displacement adjusting method of a magneto-optical crystal, so as to meet the requirement that a user can conveniently, reliably, flexibly and manually switch among multiple wavelengths or multiple optical rotation angles. The method comprises the following steps: determining the magnetic flux density distribution of the magneto-optical crystal along the optical axis displacement in a target equipment magnetic cylinder to which the magneto-optical crystal belongs; determining the transmission relation of the adjusting ring of the target equipment in the process of circumferentially rotating around the optical axis to drive the magneto-optical crystal to move along the optical axis; calculating Vierdean constants respectively corresponding to the series of target wavelengths at the expected working temperature of the target equipment; according to the magnetic flux density distribution, the Viert constant and the length of the magneto-optical crystal, a series of positions where the magneto-optical crystal generates the same target optical rotation angle for polarized beams corresponding to different target wavelengths in the displacement process of the target magnetic cylinder are calibrated; and in the assembling process, the reference position is determined firstly, and then the corresponding scribed line on the adjusting ring is aligned with the reference line on the shell.