197 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.

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.

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 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 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.

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 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.

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 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.

The utility model provides a three-dimensional modeling device. The three-dimensional modeling device comprises a support; the projector is arranged on the bracket and is used for emitting light rays; the reflecting lens is arranged on the bracket and is used for reflecting the light rays emitted by the projector to a measured object; and the first camera is arranged on the bracket and is used for shooting the measured object. According to the utility model, the projection distance is increased through mirror reflection, so that the purpose of increasing the projection area is achieved, the overall size of equipment is reduced, and the use convenience and flexibility are improved.

This invention discloses a method for visualizing the surface quality of machined parts based on GPU and mesh search algorithms, belonging to the field of machining technology. The method includes acquiring tool point cloud data and discretizing it to construct a three-dimensional mesh structure surrounding the point cloud; linearizing the three-dimensional mesh data into a one-dimensional array and packaging it; creating four types of structured GPU computing buffers to achieve batch data transmission; utilizing GPU shader programs to achieve parallel data access and fast local neighborhood queries; completing high-precision real-time reconstruction of fragment surface normal vectors through neighborhood search and signed projection distance calculation; and outputting realistic rendering results based on an optimized Phong lighting model. This invention leverages the advantages of GPU parallel computing to accurately reproduce complex textures, microstructures, and special curved surfaces, making it suitable for surface quality inspection, wear assessment, and process optimization of milled parts and tools.

The invention discloses a non-line-of-sight positioning method based on obstacle vectorization and distance measurement cross validation, which belongs to the technical field of wireless positioning and comprises the following steps: step 1, calculating a height difference according to the installation height of a base station and the preset height of a to-be-estimated label, and calculating a plane projection distance value according to the height difference and a TOF distance measurement value; 2, constructing a signal path according to a to-be-estimated label positioning result at the previous moment and the position of each base station, judging the penetration condition of the path by combining a vectorized obstacle map, and performing compensation and reliability screening on the plane projection distance based on the penetration condition to obtain a credible distance measurement value set; 3, solving and calculating a positioning residual error through multi-base-station combined positioning, and carrying out weighted fusion on a solving result according to the residual error to obtain an initial positioning result at the current moment; according to the invention, high-precision positioning can still be kept near the base station and in complex scenes such as multi-shielding and the like, and the application requirement of a shielding environment is met.

A kind of projector auto-focusing method based on spectral sensor and related equipment, in the method, the wavelength decomposition is carried out to reflected light signal, and light intensity value is obtained;The initial distance value between projector and projection surface is calculated;Acceleration data and angular velocity data are integrated to obtain position offset and attitude angle offset;Compensation distance is determined, and actual projection distance is calculated;Control stepper motor to drive lens assembly to move to the focusing position corresponding to target focal length value;Control stepper motor to drive lens assembly to reciprocate;New reflected light signal is reacquired after each reciprocation;Based on the preset mapping model, new reflected light signal is processed to obtain current measurement distance;When the deviation value between current measurement distance and preset best imaging distance is less than the preset threshold value for the first time, the focusing position corresponding to final measurement distance is determined as final focusing position. The precision of projector auto-focusing is improved, and then the definition of projection picture is improved.

The invention discloses a sample deduplication method and a sample counting method, and the method comprises the following steps: dividing a focusing section into at least two image layers in a Z-axis direction, and obtaining a shot image of each image layer; obtaining target confidence and target position information corresponding to the counting target; and sorting all the counting targets from high to low according to the target confidence, selecting the counting target with the maximum confidence and putting the counting target into the counting set P, traversing the counting targets outside the counting set P, and comparing the counting targets with the counting targets in the counting set P. According to the invention, the distance D between the two layers along the Z-axis direction is compared with the vertical de-duplication threshold value D0, so that a long-distance target, namely D < gt >, can be quickly eliminated; when D0 is greater than D0, skipping operation is carried out on the candidate target, and elimination operation is not needed, so that the calculation amount is reduced; and then calculating a horizontal distance S between the targets on the adjacent layers, that is, when D is less than or equal to D0, comparing the projection distance of the targets on the adjacent layers on the XY plane with a horizontal deduplication threshold S0 so as to avoid error elimination operation.

The application discloses a wide-angle projection lens, which can comprise a first lens group, a second lens group and a third lens group; wherein the first lens group comprises at least one meniscus aspherical lens for eliminating distortion aberration; the second lens group comprises at least one movable lens for obtaining clear pictures at different projection distances by moving the at least one movable lens; and the third lens group comprises at least one set of cemented lenses for eliminating chromatic aberration. The wide-angle projection lens provided by the application has a simple and reasonable structure, can obtain clear pictures in a wide range through cooperation between the lens groups, has high imaging quality, small picture distortion and can match high-lumen projectors. The field of view of the projection lens is increased, the high projection quality is ensured, and the wide-angle projection lens is worthy of large-area popularization and use.

The application discloses a large-magnification continuous zoom projection optical system and relates to the technical field of light projection. The system can obtain a clear picture at different projection distances by moving at least two lens groups of a focusing group. By moving at least five lens groups of a zoom group, different sizes of pictures can be obtained without changing the projection distance. A diaphragm is arranged in one of the lens groups of the zoom group, and the angle of light passing through the diaphragm is controlled when the at least five lens groups of the zoom group are moved, so that the change of the FNumber of the whole system before and after the movement is reduced, thereby reducing the change of the brightness of the projection picture during zooming. Through the cooperation of the lens groups, large-magnification continuous zooming can be realized, the imaging quality is high, the picture distortion is small, and the resolution is clear.

The application discloses a projection optical system and relates to the technical field of optical projection. By moving the movable lens group in the focusing group, a clear picture can be obtained at different projection distances. By moving the movable lens group in the zoom group, a picture of different sizes can be obtained without changing the projection distance. Through the cooperation of the lens groups, a large picture can be projected in a short distance, and the imaging quality is high, and 4K resolution can be supported while realizing continuous zooming.

The present invention relates to the technical field of three-dimensional plane projection. Specifically disclosed are a plane projection method and plane projection apparatus on a surface of a three-dimensional object. The method comprises: determining a projection distance of a projection apparatus; determining a projectable range on the basis of the projection distance; performing plane segmentation on a three-dimensional object for projection, so as to obtain a plurality of sub-planes; on the basis of the sub-planes and the projectable range, determining an arrangement mode of the projection apparatus; and arranging a plurality of projection apparatuses on the basis of the arrangement mode, and executing a screen projection operation on said three-dimensional object by means of the plurality of projection apparatuses. By improving a conventional screen projection method, a surface of a three-dimensional object is segmented, and projection is separately performed on different sub-planes, thereby ensuring sufficient projection clarity and satisfying actual requirements.

The application provides a projection display device, an optical system and a manufacturing method thereof. The projection display device comprises a polarization splitting element, at least one image generating element and an optical compensation element. The polarization splitting element is configured to polarize an incident light beam into at least two different directions of outgoing light beams. The image generating element is located on the propagation path of the at least one outgoing light beam and is configured to modulate the outgoing light beam into information light based on image information. The optical compensation element is located between the polarization splitting element and the image generating element and allows at least part of the outgoing light beam and the information light to pass through. In this way, by arranging the optical compensation element allowing at least part of the outgoing light beam and the information light to pass through, multi-screen display under different projection distances can be achieved, the structure is simple, and the cost is low. Moreover, by arranging the optical compensation element, the dark state stray light can be reduced, thereby improving the overall contrast of the bright and dark areas of the projection display device.

The utility model discloses a projector lens module with an interchangeable lens optical structure, which comprises a fixed cylinder, a mounting plate is arranged on the fixed cylinder, and the fixed cylinder is fixedly mounted; the movable lens barrel is movably installed in the fixed barrel, and the movable lens barrel and the fixed barrel are in spiral connection through a spiral structure. According to the projector lens module with the interchangeable lens optical structure provided by the utility model, the telescopic focusing of the lens is realized through the spiral structure, the requirements of different projection distances and scenes can be met, the focusing range is wide, and the focusing precision is high. Meanwhile, due to the design of the lens module, the optical structure can be conveniently and rapidly disassembled and replaced, the cheap prime lens can also adapt to different application scenes, and the use flexibility and economic applicability of equipment are greatly improved.