300 results about "Projection distance" patented technology

The invention provides a projection lens, which sequentially comprises a first lens with positive focal power from a projection surface to an image source surface along an optical axis, a second lens with negative focal power and a third lens with positive focal power from the projection surface to the image source surface, the surface of the projection side of the second lens is a convex surface, and the surface of the image source side of the second lens is a concave surface; the surface of the projection side of the third lens is a concave surface, and the surface of the image source side of the third lens is a concave surface; the surface of the projection side of the fourth lens is a convex surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the image source side of the fifth lens is a convex surface; the surface of the projection side of the sixth lens is a convex surface; a prism; a protective glass; a piece of plate glass with changeable positions is arranged between the prism and the protective glass, and the plate glass can be located at a first position or a second position through a switching device. According to the projection lens provided by the invention, clear imaging at two different projection distances is realized through switching of the plate glass, and switching between a close shot and a long shot is completed.

Techniques for linking a distance used during a reprojection operation with a focal length of a sensing system are disclosed. As a result, modifications to the focal length result in corresponding modifications to the distance. A focal length of the sensing system is adjusted. An image generated by the sensing system is accessed. A particular distance is selected based on the adjusted focal length of the sensing system. The distance is used to reproject the image.

The invention discloses a projector automatic focusing method based on a spectrum sensor and related equipment, and the method comprises the steps: carrying out the wavelength decomposition of a reflected light signal, and obtaining a light intensity value; calculating an initial distance value between the projector and the projection surface; carrying out integral operation on the acceleration data and the angular velocity data to obtain a position offset and an attitude angle offset; determining a compensation distance, and calculating an actual projection distance; controlling a stepping motor to drive a lens assembly to move to a focusing position corresponding to the target focal length value; controlling a stepping motor to drive a lens assembly to reciprocate; a new reflected light signal is collected again after each reciprocating motion; processing the new reflected light signal based on a preset mapping model to obtain a current measurement distance; and when the deviation value between the current measurement distance and the preset optimal imaging distance is smaller than a preset threshold value for the first time, determining the focusing position corresponding to the final measurement distance as a final focusing position. The automatic focusing precision of the projector is improved, and the definition of a projection picture is further improved.

The invention discloses a dynamic multi-spot projection optical system based on an LED light source, which comprises the LED light source, a reflecting cover, a grating sheet, a condensing lens, a concave reflector and an optical reflection assembly, and is characterized in that the LED light source is arranged at the bottom of the reflecting cover, and the grating sheet is provided with a light-transmitting area with a preset pattern shape; the reflecting cover consists of a plurality of plane reflectors A; the concave reflector consists of a plurality of plane reflectors B; light emitted by the LED light source forms a pattern light beam through the grating piece, the light beam is divided and reflected into a plurality of sub light beams through the conical reflecting cover, and the sub light beams are guided to the condensing lens through the optical reflecting mirror set. According to the invention, a low-cost, laser-free and safe LED scheme is adopted, and through innovative optical design, a complex dynamic light and shadow effect comparable to or even surpassing laser projection is realized, and the imaging definition is kept unchanged within a projection distance range of 2-15 meters.

The invention relates to the technical field of projection, and discloses a method, a device and equipment for measuring a projection ratio and an off-axis ratio, and a medium. The method comprises the following steps: acquiring a projection test image obtained by sampling a projection area and a reference area by an image sampling device of the projector; performing area feature extraction processing on the projection test image to obtain image size information and central point pixel information of a projection area and image size information of a reference area; determining the projection ratio of the projector based on the image size information of the projection area, the projection distance information of the projector and the image size information and the actual size information of the reference area; and determining the off-axis ratio of the projector based on the central point pixel information of the projection area, the optical axis pixel information of the projector and the image size information and the actual size information of the reference area. According to the embodiment of the invention, the cost of measuring the projection ratio and the off-axis ratio can be reduced.

The invention provides a projection lens, which sequentially comprises a first lens with positive focal power from a projection surface to an image source surface along an optical axis, a second lens with negative focal power and a third lens with positive focal power from the projection surface to the image source surface, the surface of the projection side of the second lens is a convex surface, and the surface of the image source side of the second lens is a concave surface; the surface of the projection side of the third lens is a concave surface, and the surface of the image source side of the third lens is a convex surface; the surface of the projection side of the fourth lens is a concave surface; the surface of the projection side of the fifth lens is a concave surface, and the surface of the image source side of the fifth lens is a convex surface; the surface of the projection side of the sixth lens is a convex surface, and the surface of the image source side of the sixth lens is a convex surface; a prism; a protective glass; plate glass is arranged between the prism and the protective glass, and the plate glass can be located at a first position or a second position through a switching device. According to the projection lens provided by the invention, clear imaging at two different projection distances is realized through switching of the plate glass, and switching between a close shot and a long shot is completed.

The invention discloses a point cloud data splicing method of a single laser radar, belongs to the technical field of point cloud data splicing, and is used for splicing point cloud data, selecting a plurality of feature points in the point cloud data as reference points, and determining a dynamic neighborhood through feature information of the reference points. Obtaining projection distances from points except the reference point in the dynamic neighborhood to the reference point in a specific direction, and counting the projection distances as local features of the reference point in the form of a cumulative histogram; and calculating a chi-square distance between the accumulated histograms of the two groups of feature points, calculating matrix transformation between the source point cloud data and the target point cloud data through optimal matching, and completing splicing of the source point cloud data and the target point cloud data through the matrix transformation. According to the method, the point cloud data at different angles are accurately spliced to achieve the purposes of eliminating blind areas and increasing the point cloud density, the rapidness and the high efficiency of an algorithm can be ensured, and the real-time requirement of point cloud data processing can be met.

The embodiment of the invention provides an image generation device and a head-up display. The image generation device comprises a projection lens and a projection surface located on the light emitting side of the projection lens. The projection lens comprises a fixed lens group and a movable lens group, the movable lens group can move along the optical axis of the projection lens, and the position of the projection surface is adjusted according to the projection distance range, so that the head-up display projects virtual images with different virtual image distances.

The invention discloses an interaction method for a projection picture, a projector and a storage medium, and the method comprises the steps: obtaining a first space relation between a remote controller and a positioner, and obtaining a remote control-positioning space conversion relation between a remote controller coordinate system and a positioner coordinate system; obtaining a second spatial relationship of the projector relative to the positioner, and obtaining a projection-positioning spatial conversion relationship between the projector coordinate system and the positioner coordinate system; obtaining a projection distance and a light path angle, and determining a projection area of a projection picture on the target projection surface in a projector coordinate system; according to the remote control pointing and remote control-positioning space conversion relation in the remote controller coordinate system and the projection area and projection-positioning space conversion relation, intersection point coordinates of the remote control pointing and the projection area are obtained; and displaying an indication cursor at a position corresponding to the intersection point coordinate on the projection picture. The directional remote control of the remote controller on the projection picture is realized, so that the convenience of interactive operation is improved.

An electronic apparatus includes: a video projector; a first sensor; a second sensor; a memory configured to store one or more instructions; and at least one processor, comprising processing circuitry, operatively connected to the video projector, the first sensor, the second sensor, and the memory. At least one processor, individually and / or collectively, is configured to execute the one or more instructions and is configured to: acquire projection distance information to a projection surface based on sensing data acquired through the first sensor, acquire illuminance information based on the sensing data acquired through the second sensor, acquire gain information for each region included in the projection surface based on the projection distance information and the illuminance information, correct the gain information for each region based on correlation information between the projection distance information and image quality information and correlation information between the illuminance information and the image quality information, acquire an output video by correcting the input video based on the corrected gain information for each region, and control the video projector to project the output video onto the projection surface.

The present invention discloses a multi-point projection device for improving the accuracy of laser ranging and its measurement method, belonging to the technical field of laser ranging; it first emits at least three laser beams in sequence through a laser emission unit, and the laser irradiates the surface of the object to be measured at different angles in sequence through an optical scanning unit, and after being reflected by the surface of the object to be measured, it is received by a laser receiving unit through an optical receiving unit; the data processing unit obtains the ranging value of each laser beam according to the received data, and calculates the spatial coordinate data of each measurement point by combining the emission angle of each beam; constructs a Hermite matrix from the obtained spatial coordinate data to obtain the minimum eigenvalue and eigenvector, and obtains the coefficients of the plane equation according to the minimum eigenvalue and eigenvector; substitutes the obtained coefficients of the plane equation into the projection distance formula from a point to a plane to obtain the actual distance between the laser ranging device and the object to be measured; maximally eliminates external errors and improves the ranging accuracy.

The invention provides a method for obtaining a relative position relation between linear welding seams and related equipment, and the method comprises the steps: obtaining a projection distance from an end point of a current linear welding seam to a reference linear welding seam which is any welding seam in repeated linear welding seams corresponding to the current linear welding seam; the projection distance comprises a starting point projection distance and an ending point projection distance; and determining a relative position relationship between the current linear weld and the reference linear weld based on the projection distance. The projection distances from the starting point and the end point of the current linear welding seam to the reference linear welding seam are obtained, the relative position relation between the current linear welding seam and the reference linear welding seam is determined through the obtained projection distances, and the purpose of rapidly and accurately obtaining the relative position relation between the welding seams is achieved.

The present invention provides a method for measuring the warpage of a wafer and a detection device thereof. The method comprises setting n groups of marking patterns on the wafer; measuring the projection distance L of each group of marking patterns; 1m ; Wafer process; Measure the projection distance L of each set of marking patterns after the process 2m ; Make the length of the mth arc L 1m Chord length L 2m , calculate the quasi-warping degree B of the mth arc m Wafer warp is calculated based on n quasi-warp degrees. This method measures the projected distances before and after the process for n sets of distance marks, establishes a geometric model, and obtains the warp degree. This method is time-efficient, easy to operate, and improves warp measurement accuracy. Simultaneously measuring multiple pairs of distance marks yields warp degrees at multiple locations, further improving warp measurement accuracy. Furthermore, the optical imaging device automatically adjusts the focus to detect the center length and reference height to confirm the direction of wafer warp. Finally, the angles connecting the marking patterns are uniform to avoid accidentally detecting only locations without warp, further improving warp measurement accuracy.

The invention provides a wafer warping degree measurement method and detection equipment. The method comprises the following steps: setting n groups of mark patterns on a wafer; measuring the projection distance L1m of each group of marked patterns; performing a process on the wafer; measuring the projection distance L2m of each group of marked patterns after the process; enabling the arc length of the mth arc to be L1m and the chord length to be L2m, and calculating the quasi-warping degree Bm of the mth arc; and calculating the wafer warping degree according to the n quasi warping degrees. By measuring n groups of projection distances before and after the distance marking process, the geometric model is established to obtain the warping degree, the consumed time is short, the operation is convenient, and the warping degree measurement accuracy is improved; multiple pairs of distance marks are measured at the same time, the multi-position warping degree is obtained, and the warping degree measurement accuracy is further improved; in addition, the optical imaging equipment automatically focuses to detect the center length and the warping length, and confirms the warping direction of the wafer; and finally, the included angles of the connecting lines of the marked patterns are set to be uniform, so that the situation that only positions without warping are detected accidentally is avoided, and the warping degree measurement accuracy is further improved.

The invention relates to a power transmission line icing thickness measurement method based on a YOLOv8 segmentation algorithm. The method comprises the following steps: S1, obtaining a group of icing pictures with positioning information; s2, acquiring the total number P2 of icing pixel points and the total number of picture lead pixel points; s3, calculating a plane projection distance d between the unmanned aerial vehicle and the iron tower; s4, counting the total number P1 of manually labeled lead mask pixels; s5, acquiring related parameters according to a camera imaging principle; s6, according to the triangle similarity principle and the related parameters, calculating the proportion of the image wire diameter X to the actual wire diameter Wr; s7, calculating the diameter D of the actual wire; s8, calculating the ice coating area S of the actual wire; and S8, calculating the actual conductor icing average thickness b. According to the method for measuring the icing thickness of the power transmission line, the danger of manual observation is avoided, the operation risk of personnel in a severe environment is reduced, and compared with a traditional method, the cost is low, and application and popularization are easy.

The invention discloses a correction method especially used for correcting a retroreflection brightness coefficient, and the method comprises the steps: obtaining a to-be-corrected original retroreflection brightness coefficient determined according to marking detection data, at least one part of the marking detection data is obtained under the condition of projection light, and the projection light has a calibrated projection distance; acquiring an actual projection distance of the projection light projected to a detected position when the marking line detection data is acquired; determining a distance correction coefficient according to the calibrated projection distance and the actual projection distance; and correcting the original retroreflection brightness coefficient to be corrected according to the distance correction coefficient so as to obtain the retroreflection brightness coefficient subjected to distance correction. The invention further discloses another correction method based on ambient light correction. In addition, the invention also discloses a related correction device, electronic equipment and a program product.

The invention provides a projection device and a projection correction method. The projection device comprises a projection module, a zoom projection lens, a sensor, a focal length adjustment module, a zoom ratio adjustment module, a detection module and a control unit. The zoom ratio adjusting module adjusts the position of a lens group in the zoom projection lens so as to adjust the zoom ratio of the projection image generated by the image light beam generated by the projection module projected by the zoom projection lens; the control unit calculates a focal length adjustment parameter by using an automatic focusing conversion function according to a detection value generated by the displacement of the lens group detected by the detection module and the projection distance sensed by the sensor, and controls the focal length adjustment module to adjust the imaging focal length of the zoom projection lens according to the focal length adjustment parameter. According to the projection device and the projection correction method provided by the invention, a good focusing effect can be achieved in a scene matched with any zoom ratio within an effective projection distance.

The invention discloses a bulk cargo cabin real-time fusion detection method based on a laser point cloud, and the method comprises the steps: obtaining a real-time three-dimensional scene point cloud of a port scene, and obtaining a deck plane equation and a normal vector; projecting the three-dimensional scene point cloud to a two-dimensional deck plane, and constructing an intensity image taking point cloud intensity as information and a depth image taking projection distance as information; obtaining an intensity mask image from the intensity image; acquiring a depth edge image according to the depth image, and fusing the depth edge image and the intensity mask image to obtain a fused edge image; contour extraction is carried out on the fused edge image, polygon fitting is carried out, a quadrangle in the fused edge image is reserved as a candidate cabin, and a minimum enclosing rectangle of the quadrangle is obtained; and obtaining four vertex coordinates of the minimum bounding rectangle, and back-projecting the four vertex coordinates to the three-dimensional space to obtain three-dimensional space rectangular coordinate points of the final cabin. The method is suitable for a complex environment and a dynamic scene in a port operation area, and the cabin in the dynamic scene can be obtained in real time.

A head-up display includes an image-generating system, and a projecting optical system that includes a common mirror and a folding mirror. The image-generating system is configured to emit a first source light beam and a second source light beam that pass through an image plane. The projecting system also includes an element for redirecting beams by diffraction that deflects the first source light beam downstream of the image plane into a first intermediate beam directed toward the common mirror. The folding mirror is configured to reflect the second source light beam downstream of the image plane into a second intermediate beam directed toward the common mirror. The common mirror is configured to intercept and project the first intermediate beam and the second intermediate beam to form a first virtual image at a first projection distance and a second virtual image at a second projection distance.

The utility model discloses a construction positioner and tunnel construction five line wall -hanging equipment belongs to the technical field of tunnel construction, and the construction positioner includes a character line laser and universal angle adjusting device, and the universal angle adjusting device includes the adjusting portion and the installation portion for installing on the projection point, and the character line laser is installed on the adjusting portion of universal angle adjusting device, and the character line laser includes the rotary emission head for projecting the character laser line on the construction surface, and the projection point has the projection distance with the construction surface. Tunnel construction five line wall -hanging equipment includes the vertical frame, is equipped with five projection points of setting gradually from top to bottom on the vertical frame, and the construction positioner is installed on the projection point. Utilize the character line laser to project the character laser line on the construction surface, to replace the way of forming the construction line of paint spraying line drawing, has solved the problem that the construction surface exists the paint spraying line drawing operation difficulty, and exists the deviation.

The invention provides a real-time target vehicle width estimation method and system, and belongs to the technical field of visual perception target processing. The evaluation method comprises the following steps: acquiring scene image data with a target vehicle; performing target detection on the scene image data through a target detection model, and determining a vehicle tail frame pixel coordinate of the target vehicle; according to the vehicle tail frame pixel coordinates, determining a vehicle tail frame bottom edge midpoint and a rear wheel grounding point; a built-in camera of the vehicle is calibrated, and internal parameters and external parameters of the built-in camera are determined; based on the internal reference and the external reference, determining a projection distance measurement result through perspective transformation; calculating the course angle of the target vehicle according to the rear wheel grounding point; determining the physical width of the target vehicle in combination with the projection distance measurement result and the course angle; and judging whether the physical width is valid or not, performing filtering processing on the physical width, and determining a width estimation value of the target vehicle. According to the method, errors and fluctuation are effectively reduced, and the precision of vehicle width estimation is improved.

A mammography apparatus includes: an imaging table; a radiation source; a compression plate that compresses the breast and is movable between the radiation source and the imaging table; a projector that includes a display displaying an image including first information projected onto a first surface facing the radiation source on the imaging table and second information projected onto a second surface facing the radiation source on the compression plate, and a projection optical system, in which a focus of the projection optical system is adjusted in accordance with a projection distance to the first surface; and a processor that is configured to control the display and change at least one of a display size or a display position of the second information in the image on an image display surface of the display in accordance with movement of the compression plate having the second surface independently of the first information.

The utility model discloses a vehicle headlamp and a vehicle, the vehicle headlamp comprises an illumination module used for illumination and a projection module used for projection, and the projection module comprises a first projection unit and a second projection unit; the first projection unit and the second projection unit are independently arranged, and the first projection unit and the second projection unit are suitable for being used under different projection distances; and the controller is respectively connected with the first projection unit and the second projection unit, and the controller is used for receiving the projection signal and controlling the operation states of the first projection unit and the second projection unit according to the projection signal. According to the utility model, more convenient, efficient and high-quality projection experience can be provided for a user, the display form of the vehicle headlight is enriched, intelligent interaction is realized, and the overall science and technology feeling and intelligence feeling of the vehicle are improved, so that more efficient and accurate projection control is realized, the identification degree of the surrounding environment in the driving process is enhanced, and the driving experience of the vehicle is improved. Therefore, the driving safety is improved.

The invention relates to the technical field of contact network measurement, and relates to a method for automatically measuring the spacing of contact network crossing lines. The method comprises the following steps: step 1. parameter acquisition, step 2. line identification; step 3. line spacing calculation; step 4. supplementary manual measurement, any two points in a three-dimensional point cloud can be selected, and the straight-line distance between the two points and the projection distance of each two-dimensional surface can be directly calculated; step 5. the above steps 1-4 are repeated until the measurement is completed. The invention can calculate the shortest distance between all lines of the entire line in batches at one time without using additional measuring equipment to perform individual distance measurement on the line, and the measurement result is both accurate and fast. At the same time, the manual measurement is supplemented, and any two points in a three-dimensional point cloud scene can be selected to view their straight-line distance and the projection distance of each two-dimensional surface, so as to meet various requirements for the spacing of contact network lines.

The invention discloses a level set field reconstruction method and system based on a three-dimensional finite element grid and a medium. Relates to the technical field of geometric reconstruction. Positioning a space Cartesian grid area intersected with the boundary surface grid based on a separation axis theory; calculating a geometric space point-surface position relation, calculating a directed projection distance from a space Cartesian grid center to a two-dimensional boundary surface grid, and correcting the positive and negative characteristics of a Cartesian grid level set value based on a three-dimensional eight-direction rapid scanning method, so that the grid level set value is consistent with a region boundary value; according to the method, the geometric reconstruction problem of the deformable body which is complex in appearance and free of explicit analytic expression can be efficiently and accurately solved, a coupling approach between a finite element grid and a Cartesian grid is established under a non-conformal grid system, and the flexibility and universality of explicit calculation of a level set function under the Cartesian grid are improved.

A method of inspecting a glazing is described. The glazing is configured for installing in a vehicle having a head up display projector with a first projection distance from an eye box position. The method of inspecting comprises positioning the glazing relative to a light source; directing light from the light source to illuminate a portion of the first head up display region to produce a first virtual image at a first image plane, the first image plane being a first distance from the eye box position; imaging the first virtual image at the first image plane with an imaging system to capture a first image; and using the first image to determine a first performance parameter of the glazing; wherein the first distance is different to the first projection distance. Apparatus for carrying out the method is also described.

This disclosure provides a projection device and a focusing method for the projection device. When a focusing event is triggered, the projection device controls a shift motor to move the optical axis of the light-emitting component by acquiring the rotational attitude change provided by an inertial measurement sensor. The projection surface is determined using a three-dimensional point cloud set provided by a time-of-flight sensor and the pixel plane corresponding to the light-emitting component. The projection distance between the light-emitting component and the projection surface is calculated based on the depth distance between the time-of-flight sensor and the projection surface. Finally, the focusing motor is controlled to adjust the focus of the light-emitting component based on the projection distance. When a focusing event is triggered, the projection device can achieve automatic focusing without a test chart, effectively reducing focusing time.

This invention relates to the field of digital simulation technology, specifically to a method for three-dimensional visualization modeling of natural resources based on digital twins. The method includes: constructing a discrete computational map based on a real-world three-dimensional model of the target area and geographic information system (GIS) data; projecting the design base of the building information model (BIM) onto the discrete computational map to determine design boundary nodes; performing constraint propagation calculations on the discrete computational map using the design boundary nodes as propagation starting points to determine the cumulative compliance consumption and cumulative horizontal projection distance of each node in the discrete computational map; determining the topology type of each node based on its cumulative compliance consumption, cumulative horizontal projection distance, original terrain elevation, and preset engineering slope parameters; and geometrically reconstructing the discrete computational map based on the topology type of each node to generate a digital twin model that integrates the BIM and the real-world three-dimensional model. This invention simultaneously achieves automatic compliance avoidance and structural closure generation of the slope model.

The invention relates to the technical field of AI projection distance detection and correction systems, in particular to an intelligent AI projection distance detection and correction system, and solves the problems that when the intelligent AI projection distance detection and correction system is used and projection distance detection and correction are carried out, a user possibly needs to manually adjust the position or parameters of a projector, and the operation is inconvenient. Or rough correction is carried out through a preset fixed algorithm. The system comprises a data calculation module and a correction control module, and compared with a traditional intelligent AI projection distance detection and correction system, when projection distance detection and correction are carried out, a user possibly needs to manually adjust the position or parameters of a projector, rough correction is carried out through a preset fixed algorithm, and the correction efficiency is greatly improved. According to the intelligent AI projection distance detection and correction system, the data calculation module and the correction control module are integrated, and through linkage of the data calculation module and the correction control module, the system can autonomously complete the detection and correction process of the projection distance.

The application provides a kind of InSAR deformation monitoring point high-precision geometric positioning method combined with three-dimensional model data, belongs to synthetic aperture radar technical field, comprising: converting three-dimensional model data into space rectangular coordinates, combined with satellite orbit parameter iteration to solve row and column coordinates in SAR image, calculate the slant range projection distance of satellite-observation vector, screen and eliminate invalid data in shadow area;With the screening result as a mask, obtain a subset of three-dimensional model data, calculate the row and column coordinates of the InSAR deformation monitoring point of the subset of three-dimensional model data, and search for candidate points based on plane geometric constraints, match the accurate elevation of the monitoring point by height system deviation;Based on the determined accurate elevation, construct the RD positioning model of distance constraint, Doppler frequency constraint and ellipsoid constraint, and solve the high-precision geometric position of InSAR deformation monitoring point. It can realize the high-precision geometric positioning of infrastructure InSAR deformation monitoring point, and improve the applicability in infrastructure fine deformation monitoring.