93 results about "Projection line" patented technology

The invention relates to the technical field of computer graphics, in particular to a three-dimensional geological section real-time cutting method and system and a storage medium, and the method comprises the steps: constructing a BVH tree to accelerate the cutting of a three-dimensional geological model, and calculating the projection of intersecting line segments on a cutting surface two-dimensional coordinate system to obtain a projection line segment set; constructing an undirected graph structure based on the projection line segment set; and extracting a closed profile contour based on the undirected graph structure, subdividing a triangular grid, and rendering and displaying. The implementation of the scheme can break through the traditional preprocessing dependence, and improve the profile generation efficiency and the visualization integrity.

A projection method based on the three-dimensional scanning projection line of the structured light relates to three-dimensional information reconstruction technology field and comprises: switching different projection image groups periodically or randomly in three-dimensional measurements, to collect a plurality of continuous projection image groups (S101); projecting several images of the projection image group onto a surface of an object to be measured (S102); imaging projection images projected onto the surface of the object to be measured to obtain imaged images (S103); and decoding the imaged images and determining a corresponding relation between respective imaging positions and projection positions, to provide three-dimensional information for reconstructing the surface of the object to be measured (S104).

The invention belongs to the technical field of oil and gas pipeline safety monitoring and unmanned aerial vehicle image analysis, and discloses a two-stage oil and gas pipeline occupation pressure monitoring method and system based on unmanned aerial vehicle space perception and deep learning fusion, and the method comprises the steps: obtaining image data and space data of a to-be-monitored region, combining the image data and the space data with a DEM, and obtaining a DEM image; realizing projection of geographic coordinates of the pipeline to image pixel coordinates to obtain a plane image of the pipeline; constructing and deploying a lightweight target detection network DRF-YOLOv8n, performing reasoning on a plane image of the pipeline based on the lightweight target detection network DRF-YOLOv8n, outputting a candidate bounding box, and performing screening and key frame judgment; a Promp-guide SAM pixel level segmentation module is used to realize pixel level segmentation of the key frame, and a candidate pixel mask is generated; and judging whether occupation occurs or not through the intersection of the pipeline projection line and the candidate pixel mask, and outputting alarm information with geographic coordinates.

This application discloses an image projection method, apparatus, projection system, and storage medium. The method includes: acquiring a first projected image obtained by a first projector projecting a projection line diagram onto a projection surface according to a preset correction dot matrix, and acquiring a second projected image obtained by a second projector projecting a projection line diagram onto a projection surface according to a preset correction dot matrix; calculating the overlap between the first and second projected images as an initial overlap; adjusting the positions of correction points in the preset correction dot matrix, and performing the steps of acquiring the second projected image obtained by the second projector projecting a projection line diagram onto a projection surface according to the preset correction dot matrix, and calculating the overlap between the first and second projected images, until the obtained overlap is the highest and greater than or equal to the initial overlap; acquiring the target correction dot matrix corresponding to the highest overlap, so that the second projector projects according to the target correction dot matrix, thereby improving the accuracy of the superimposed projection.

The embodiment of the present disclosure relates to a kind of steel anchor beam space cable conduit assembly positioning method.The method comprises: arranging platform on hardened ground, and arranging first longitudinal and transverse reference line on the platform;According to the first longitudinal and transverse reference line on the platform, tooling structure is arranged on the platform, and the tooling structure is used for the assembly positioning of cable conduit;Second longitudinal and transverse reference line is arranged on wallboard, and steel bracket is positioned according to the first longitudinal and transverse reference line on the platform and the second longitudinal and transverse reference line on the wallboard;Cable conduit is initially arranged on wallboard by tooling structure;According to the preset horizontal bridge direction angle, the theoretical projection line of cable conduit on platform is determined, and baseline is hung on the intersection of cable conduit, the position of cable conduit in horizontal direction is adjusted by tooling structure, to make baseline intersection on theoretical projection line;According to preset angle, the position of cable conduit in vertical direction is adjusted.The positioning of the embodiment of the present disclosure to cable conduit is accurate and efficient.

The invention relates to a method for 3D reconstruction of a scene (2). The method comprises the step of providing a first camera (3) with a known position and orientation. The method further comprises a step of determining a first set of projection lines corresponding to the pixels (11) of said first camera (3), said projection lines being defined by the location and orientation of said camera (3) and the corresponding pixels (11). The method further comprises the step of projecting a light beam (13) onto the scene (2) by means of a light source (12) so as to limit a point (1) on said scene (2). The method further comprises the step of determining pixels corresponding to the image of the point (1) on the first camera (3) so as to define a corresponding first projection line (9) from the first set of projection lines. The method further comprises a step of determining a second projection line (10) from the second set of projection lines, the second projection line (10) corresponding to the instantaneous position and orientation of the light beam (13) or to the image of the point (1) on the second camera (4). The method further comprises a step of calculating a 3D position (17) of the point (1) on the scene (2) on the basis of the first and second projection lines (9, 10), wherein the 3D position (17) is defined in an area (18) in which the first projection line (9) and the second projection line (10) are closest to each other.

The invention discloses an intelligent safety management method and device for construction personnel in a TBM (Tunnel Boring Machine), and the method comprises the steps: selecting projection lines of each standing platform along the section of the length direction of a tunnel from an imported TBM three-dimensional model, obtaining the real-time coordinate position of each projection line in a positioning space, obtaining the information of a movable label positioning point on a safety helmet of the construction personnel, and carrying out the positioning of the movable label positioning point; obtaining a movable label coordinate of the movable label positioning point in the positioning space; calculating the spatial position relationship between the real-time coordinate position of each projection line and the coordinates of the activity label, and selecting the standing platform corresponding to the projection line of which the spatial position relationship meets the condition as the current activity platform of the constructor; and the relative position change trend between the movable label positioning point and the current movable platform of the constructor is monitored in real time, and when the relative position change trend does not meet the safety construction condition, it is judged that the constructor conducts uncapping construction. Whether a constructor carries out uncapping construction or not is monitored, and construction safety management of the constructor in a hole is guaranteed.

The application discloses a saw blade detection system based on multi-source data fusion, and particularly relates to the technical field of saw blade detection; the saw blade detection system is characterized in that: side surface image data of a saw blade is collected, tooth back surface projection line features and edge geometry features are extracted, initial visual feature data of the saw blade is established; side surface image data is continuously collected in actual processing, side edge projection line features and edge position changes are compared and analyzed, visual wear data is determined; main shaft current data is synchronously collected and current change trends and variability are analyzed, current wear data is determined; normal wear and tooth loss abnormal trends of the saw blade are analyzed based on the visual wear data and the current wear data, visual degradation features and current abnormal features are obtained; visual and current fusion feature data is calculated in combination with product processing unqualified rate, and a saw blade scrapping trigger threshold is established; finally, fusion feature data and the scrapping threshold are compared in real time, so that the saw blade scrapping or replacement time is determined; and the application improves the precision and reliability of saw blade state monitoring.

The application discloses a grinding processing method for inner concave outer circle and end face, which comprises the following steps: grinding the inner concave outer circle and end face of a part to be processed by using a grinding wheel; the grinding wheel comprises a grinding wheel body and a connecting rod; one end of the connecting rod is connected to a grinding wheel frame, and the other end is connected to one end of the grinding wheel body; a grinding surface is arranged on the side surface of the grinding wheel body to grind the part to be processed; the central axis of the connecting rod and the central axis of the part to be processed have an inclination angle alpha; on the plane passing through the central axis of the part to be processed, the end face projection line is used as a reference line, the highest height of the inner concave outer circle projection line relative to the reference line is H, the diameter of the grinding wheel body is D, the diameter of the connecting rod is d, the length of the connecting rod is l, l<=3d is satisfied, and beta=90-alpha. The application has the advantages of high machining precision and high efficiency.

The present invention provides a centering measurement method for shipbuilding, which relates to the field of centering measurement. The centering measurement method comprises the following steps: step 1, tying a chalk line above a reference plane, hanging a simulation block at the lower end of the chalk line, allowing the chalk line to naturally hang and remain stationary; step 2, removing the simulation block and hanging a plumb bob; step 3, placing a light source structure on the reference plane, the light source structure being located on one side of the plumb bob, and a segmented measurement surface being located outside the reference plane and corresponding to the other side of the plumb bob; step 4, turning on the light source structure to emit irradiation light toward the other side of the plumb bob, the irradiation light being parallel light, and the irradiation direction of the irradiation light forming an inclined angle with the plane where the reference plane is located; step 5, under the irradiation of the light source, a chalk line projection line is formed on the segmented measurement surface, adjusting the positions of the chalk line and the plumb bob so that the chalk line projection line coincides with the center line of the segmented structure, and observing the deviation value between the plumb bob tip projection and the center line of the reference plane to determine the centering accuracy of the segmented structure.

A method for determining a slipstream area behind a vehicle ahead is described, wherein a pattern is projected forward in the direction of travel by means of at least one headlight of the vehicle, wherein the pattern is generated from a plurality of headlight pixels, wherein projection lines are determined for the headlight pixels, wherein an environment located in front of the vehicle is measured three-dimensionally and three-dimensional measurement data is generated, wherein features of the pattern located in front of the vehicle, generated by reflection from the headlight pixels, are recorded by means of at least one camera pointing forward in the direction of travel and transferred as image points into a camera plane. From the distance of the image points from the epipolar pole of the camera plane, a distance of the reflected features of the pattern to the headlight is determined.Furthermore, a correspondence is established between reflected features of the captured pattern and the three-dimensional measurement data on the respective projection lines of the headlight pixels, whereby deviations between the distances of the features of the pattern to the headlight and distances to the headlight determined from corresponding three-dimensional measurement data are determined on the respective projection line, and the wind shadow area is determined on the basis of the deviations.

The invention relates to an angle calculation method and a panoramic head-up display system, the panoramic head-up display system comprises windshield glass, a display screen and a polarization unit, the plane where the polarization unit is located is parallel to the plane where the display screen is located, and the method comprises the following steps: according to three non-collinear points on the surface of the display screen, calculating the angle of the display screen; calculating a normal vector of a display plane of the display screen; calculating the direction vector of P polarized light according to the normal vector of the reflection plane and the direction vector of the incident light; drawing a vertical line vertical to the incident light in the reflection plane, taking the projection of the vertical line in the display screen as a projection line, and calculating the direction vector of the projection line; acquiring two points longitudinally arranged along a display area of the display screen, and calculating a reference vector; and calculating the angle theta of the polarization unit according to the direction vector and the reference vector of the projection line. According to the technical scheme, the problem that the utilization rate of P polarized light is not high due to the fact that a polarization unit is directly rotated by 90 degrees and then attached to the surface of a display screen in a traditional scheme can be solved.

This application relates to the field of data analysis technology, and in particular to a method, apparatus, computer device, storage medium, and computer program product for extracting profile lines from oblique photogrammetry data. The method includes: dividing the oblique photogrammetry data into multiple block files according to a geographic grid, with each block file containing a root node corresponding to a specific block file, and hierarchically storing node files corresponding to child nodes derived from the root node; identifying target block files and target node files that intersect with the projection line data; reading specific geometric data from the target node files, with the geometric data associated with profile line extraction; using a preset intersection algorithm to traverse the geometric data in all target node files to obtain profile points, and connecting the profile points to generate target profile lines. This method can improve the efficiency of profile line extraction in large-scale oblique photogrammetry data and reduce the computational load of profile line extraction.

The application discloses an initialization method of a conic surface under a projection linearization track surface, and belongs to the technical field of calculation, reckoning or counting. The method first obtains a preliminary estimation of a target track through three groups of observation data; determines a conic surface containing an initial track surface according to initial track information and geometric knowledge; estimates the missing height information in combination with the conic surface, and obtains more position information of the target in combination with the existing angle information; projects the position information of the target into a two-dimensional section, re-estimates the track parameters by using a least square algorithm, and more accurate track parameters can be obtained; then the iteration process is repeated by using the newly obtained track information until a certain initial orbit determination accuracy requirement is met. The algorithm firstly fits the height information of the target by using a conic surface coordinate system, and realizes linear fitting of the position vector by using a track surface projection method, so that the calculation amount is small and the accuracy is high.

This invention relates to the field of shipbuilding technology and discloses a method for lofting and unfolding a sloping cylindrical structure, comprising the following steps: S1, creating a side view and a normal section view; S2, obtaining the minor axis projection line HV in the side view; S3, obtaining the minor axis section projection line H1V1 and the major axis section projection line P1W1 in the normal section view; S4, obtaining the major axis projection line PW in the side view; S5, drawing perpendicular lines from points P and W to the center line of the cylinder to obtain line segment QT; S6, dividing the normal section view into equal parts, projecting each division point onto line segment QT to obtain equal division projection points, and unfolding the sloping contour to obtain unfolding points; S8, repeating S7, smoothly connecting each unfolding point; S9, obtaining the generatrix unfolding points, connecting two generatrix unfolding points to complete the lofting and unfolding diagram of the sloping cylindrical structure. Using the minor axis projection line and the major axis projection line as a reference, the lofting and unfolding of the cylinder is achieved, realizing accurate lofting and unfolding of any sloping cylindrical structure, facilitating cylinder installation.

The present invention relates to the field of aviation technology, and discloses a ground measurement method, device, and medium for the deflection angle of an aircraft rudder. The method comprises establishing a coordinate system; selecting two points A and B as marks on the lower surface of the rudder, and recording the distance between the two points A and B; recording the projection points A' and B' of the two points A and B on the horizontal plane, recording the distance between A' and B', and calculating the angle between the projection line and the second vertical plane, and calculating the calculated angle, recording the calculated angle before the rudder deflection and the calculated angle after the deflection, and calculating the deflection angle. The device comprises a coordinate system establishment mechanism, a measuring mechanism, a storage unit, and a calculation unit. By establishing a three-dimensional coordinate system, the rudder deflection angle is calculated in combination with the change in the projection angle of the measuring point, which is applicable to ground conditions and improves the convenience and versatility of measurement.

The invention provides a method for designing a runner body jig frame, which comprises the following steps of: functionally dividing a runner body into a lower half part fused with a main ship body and an independent closed upper half cylinder part in the head-tail direction and the up-down direction on the basis of curvature change and space closure of the runner body; the lower half part and the corresponding part of the main hull are used as a whole, and a first jig frame is manufactured in a positive manufacturing mode; for the independent upper half cylinder part, a second jig frame is manufactured in a single beveling reverse manufacturing mode with the direction of the longitudinal center line of the flow channel as a rotation and projection base plane, so that the projection line of the tail closed area of the upper half cylinder part is perpendicular to the base plane; and after the construction of the lower half part and the upper half cylinder part is completed respectively, the upper half cylinder part is removed from the second jig frame and is hoisted to the lower half part on the first jig frame to be accurately folded, and welding is completed. According to the technical scheme, the shape maintaining problem of a complex curved surface, the accurate positioning problem of a flow channel body and the safety construction problem in a narrow closed space can be solved at the same time.

Systems and methods are described relating to pose and shape estimation of objects. In some examples, a camera generates images depicting an object from different viewpoints. Within the images, a system identifies corners of the object, and the system uses these corners to generate lines that are projected from different viewpoints through the corners. Points may be identified by intersecting lines such that the points may be used to generate estimations of the object. The estimation with the highest score may be used to place the object in a location different from where the object was located.

The present application discloses a method and apparatus for determining a position. A specific embodiment of the method includes: projecting a point cloud generating device to scan the target end face of a target object to generate a point cloud to obtain a projection line segment; comparing the length of the projection line segment with the length of the target end face to determine whether the point cloud generating device is blocked during the scanning of the target end face; in response to not being blocked, determining the relative position of the item access device where the point cloud generating device is located relative to the target object based on the target point of the projection line segment. The present application can determine whether the point cloud generating device is blocked during the scanning of the target end face, and when it is clear that it is not blocked, determine the relative position of the item access device relative to the target object based on the projection line segment, thereby improving the efficiency and accuracy of determining the relative position.

The utility model discloses a display substrate and a display device. The display substrate includes sub-pixels and a defining structure. Each sub-pixel comprises a light-emitting functional layer; the limiting structure is located between the light-emitting areas of the sub-pixels of different colors, and the thickness of the light-emitting functional layer located in the limiting structure is smaller than that of the light-emitting functional layer located in the light-emitting areas of the sub-pixels. The sub-pixels comprise two kinds of color sub-pixels which are arranged in the first direction and are adjacently arranged, and a light-emitting area of one of the two kinds of color sub-pixels comprises a first area and a second area which are arranged in the second direction; the limiting structure comprises a first limiting structure located between the light-emitting areas of the two color sub-pixels, the first limiting structure comprises a first inclined part, the orthographic projection of the first inclined part on the projection straight line is overlapped with the orthographic projection of the first area on the projection straight line, and the first inclined part is bent in the direction away from the first area. And at least part of the extension direction of the first inclined part intersects with the first direction and the second direction. The display effect can be improved by setting the bending direction and the extending direction of the first inclined part.

This invention discloses an intelligent safety management method and device for construction personnel inside a TBM (Tunnel Boring Machine). The method involves selecting projection lines from the imported 3D TBM model, mapping the cross-sections of each standing platform along the tunnel length, and obtaining the real-time coordinates of each projection line in the positioning space. It also involves acquiring the positioning point information of the movable tag on the worker's safety helmet, obtaining the coordinates of the movable tag in the positioning space. The method calculates the spatial relationship between the real-time coordinates of each projection line and the coordinates of the movable tag, selecting the standing platform corresponding to the projection line whose spatial relationship meets the conditions as the worker's current active platform. The method monitors the relative positional change trend between the movable tag positioning point and the worker's current active platform in real time. When the relative positional change trend does not meet the safe construction conditions, it determines that the worker should remove their helmet before starting work. By monitoring whether workers remove their helmets before starting work, the method ensures the safety management of construction personnel inside the tunnel.

The present invention discloses an automatic method for eliminating indoor and outdoor digital image shadows for unattended use, which relates to the field of image technology and includes the following steps: input the original picture; detect the light source in the image space and determine the light source contour and center point; detect the foreground object in the image space and determine the foreground object contour and center point; traverse each point of the foreground object in the image space to form a complete shadow area; enhance the brightness of the shadow area; output the picture after shadow elimination; by using the principle of invariance of projection lines, on the image plane, the light source, the foreground contour, and the shadow contour still form a straight line; by using this characteristic, the shadow area can be accurately and quickly located; for the shadow area image, by calculating the proportional amplification coefficient, the pixel mean value of the shadow area is enhanced so that the pixel mean value of the shadow area is consistent with the pixel mean value of the area outside the shadow, thereby realizing automatic shadow elimination.

1. The name of the design product: data line (Switch screen projection line). 2. The use of the design product: for data transmission between electronic devices. 3. The design points of the design product: in the combination of shape and pattern. 4. The picture or photo that best indicates the design points: front view.

A turning plate type multi-point discharging plowshare comprises a plowshare frame, a striker plate and a plow frame connecting mechanism. The left striker plate and the right striker plate are in mirror symmetry and are respectively a left striker plate and a right striker plate, the left striker plate and the right striker plate are respectively and rotatably connected to the plowshare frame, and the rotating axes are on mirror surfaces in mirror symmetry of the left striker plate and the right striker plate. When the discharging plowshare descends to the lowest position, the positions of the left striker plate and the right striker plate are as follows: in the first state, the left striker plate and the right striker plate are static, the projection of the left striker plate and the right striker plate on the surface of the conveying belt is in an arrow shape, and the tip end of the arrow faces forwards, namely, the feeding direction; in the second state, the left striker plate rotates, the right striker plate is static, the projection of the left striker plate and the right striker plate on the surface of the conveying belt is in an oblique line shape, and the corresponding projection line segment of the left striker plate is in the front; in the third state, the left striker plate is static, the right striker plate rotates, the projection of the left striker plate and the right striker plate on the surface of the conveying belt is in an oblique line shape, and the corresponding projection line segment of the left striker plate is behind.

The invention discloses a WAAM welding speed adaptive control method based on feature fusion. The WAAM welding speed adaptive control method comprises the steps of point cloud data processing and projection path generation; calculating projection line features; carrying out dynamic weight feature fusion and cross section selection; carrying out cross section modeling and error calculation; adaptively optimizing the welding speed; and closed-loop feedback. Compared with the prior art, the method is based on the comprehensive feature score and the self-adaptive threshold value, the key cross section needing key control can be accurately recognized, and the problem of inaccurate selection caused by fixed feature weight in a traditional method is avoided; a hierarchical control strategy is adopted, the welding speed is dynamically adjusted according to the real-time prediction deviation index, and the forming quality and the manufacturing efficiency are balanced.

This invention discloses a saw blade detection method and system based on multi-source data fusion, specifically relating to the field of saw blade detection technology. By simultaneously acquiring high-speed visual images of the saw blade's front and side views and spindle current signals, the initial tooth profile reference features of the saw blade are extracted. Furthermore, the system monitors in real time changes in the straightness of the projection line, the amount of cutting edge retraction, and abnormal changes in the current signal during the saw blade cutting process. By fusing visual and current data analysis, the normal wear and degradation trend of the saw blade and abnormal tooth loss characteristics are observed, thereby achieving accurate identification of saw blade wear or tooth loss conditions. A comprehensive evaluation is then performed based on the defect rate of sawn products, ultimately outputting an accurate and reliable saw blade replacement control signal. This invention effectively improves the accuracy of saw blade condition detection and the timeliness of replacement decisions, avoiding processing quality problems and ensuring production efficiency and processing safety.

The invention relates to the technical field of feeding regulation and control, and particularly discloses an automatic feeding regulation and control method for a bag making machine based on intelligent perception, which comprises the following steps: S1, additionally arranging a regulating roller capable of vertically displacing between transmission rollers at two ends of a conveying belt, arranging an infrared distance measuring point above a plastic film material, and monitoring the state of the material in real time through a projection line of the infrared distance measuring point; s2, setting the initial position of an adjusting roller, measuring the displacement of the adjusting roller, calculating the real-time tension value of the plastic film in combination with an infrared projection line, and establishing a correlation model of the displacement and the tension value through a calibration experiment; s3, in the conveying process, an infrared distance measuring point continuously obtains a real-time projection line and a tension value, the needed displacement amount is reversely deduced according to the correlation model, and the position of a roller is automatically adjusted to maintain the stability of the material tension; non-contact tension monitoring is achieved through structural innovation and infrared sensing, self-adaptive dynamic regulation and control in the feeding process are achieved based on a physical model, and the production precision and efficiency are improved.

The application provides a test method for testing the burst point of a double-station test empty bomb, comprising the following steps: fixing a gun position, projecting an ideal trajectory line on a first plane according to the ideal trajectory line and an ideal burst point of the gun position, and selecting a point A on the first projection line; selecting a first test point P1 and a second test point P2 on the first plane, and the distance from the first test point P1 and the second test point P2 to the first projection line is equal, and the distance is recorded as C; placing a first high-speed camera and a second high-speed camera on the first test point P1 and the second test point P2 respectively, adjusting the shooting field of view of the two high-speed cameras, so that the shooting field of view of the two high-speed cameras covers the ideal burst point and the point A; launching a projectile, and the high-speed cameras shoot and record the motion track and the actual burst point of the projectile, the first high-speed camera shoots to obtain a first image, and the second high-speed camera shoots to obtain a second image; processing data, calculating the burst point distance L according to formula (1), and calculating the burst point offset S according to formula (2). The test result of the test method is more accurate.

The invention relates to the field of industrial manufacturing, and discloses a method, device and equipment for obtaining a drive line and a storage medium, and the method comprises the steps: determining a target contour surface; processing the target contour surface, and determining one or more contour edges of the target contour surface; projecting the one or more contour edges to a plane perpendicular to the direction of the cutter shaft, determining projection lines of the contour edges on the plane, and performing de-weighting processing on overlapped parts among the projection lines to obtain one or more de-weighting processing results; and determining a target de-duplication processing result from the one or more de-duplication processing results, taking a line corresponding to the target de-duplication processing result as a driving line, and transmitting the driving line into a tool path calculation engine to calculate a tool path along the driving line. According to the invention, the manual process of generating the drive line can be reduced, the operation steps and error risks are reduced, the preparation time of processing is shortened, and the production efficiency can be improved.

The embodiment of the application discloses a building modeling method, the method comprises the following steps: acquiring point cloud data collected for a target building, the point cloud data containing first point cloud data of multiple wall surfaces of the target building; acquiring topological information according to the first point cloud data, the topological information including position information of a projection line segment of each wall surface and position information of at least one ground area formed by the multiple projection line segments; wherein the multiple projection line segments are formed by the intersection of straight lines where the projection lines of the multiple wall surfaces on a horizontal plane are located; determining whether each projection line segment or the ground area is retained through a target neural network according to the topological information, wherein the retained projection line segment and the ground area are used to construct a building information model (BIM) of the target building. The application can still obtain a building model with high precision when the data collected for the building is not comprehensive.