36 results about "Dot pitch" patented technology

The invention discloses a bridge crack feature fine quantification method and system based on deep learning, and relates to the technical field of bridge detection, and the method comprises the steps: carrying out the preprocessing of bridge surface image data; inputting the preprocessed image data into a U-Net network fused with a multi-scale channel space attention module for semantic segmentation and outputting a crack segmentation mask graph; performing morphological refinement operation to obtain fracture skeleton line data, and calculating a trend angle and curvature distribution; measuring the crack width along the normal direction of the skeleton point to generate a width distribution thermodynamic diagram; accumulating skeleton point intervals to calculate the total length and identifying branch features; according to the method, the segmentation IoU reaches 85% or above, the width precision is superior to 0.05 mm, and the method has the crack development trend prediction capability.

The application discloses a stereovision-based slurry and slag identification method, and belongs to the technical field of tunnel construction, and specifically comprises the following steps: two same cameras are placed above the slurry and slag, fixed after being adjusted to the same height and the imaging half-frames are overlapped; a calibration plate is shot to obtain the baseline distance of the optical centers of the two cameras; the exposure time is determined in combination with the camera accuracy, the slurry and slag movement speed and the imaging magnification; two images of the slurry and slag are synchronously shot, the coordinate system is established, the sight distance difference and the imaging point spacing are calculated, the object distance is solved based on the geometric relationship constructed by the Gaussian imaging formula and the slurry and slag point position and the imaging plane and the camera optical center; finally, the three-dimensional point cloud model is established according to the object distance, and the slurry and slag shape, volume and surface area are output. The application solves the problems of motion blur, image distortion and the inability to accurately identify the size of the slurry and slag in the identification of the slurry and slag, can improve the identification accuracy, and meets the intelligent and refined construction requirements of large shield projects.

This invention provides a method and system for rapid on-board extraction of overlapping regions based on nested grids. The method includes obtaining the boundary conditions of a base map based on a base map, and acquiring the intersection points of the base map and the probe orbit; determining the nadir point trajectory based on the acquired satellite probe orbit range; calculating the intersection points of the nadir point trajectory and the base map; comparing the two intersection points to obtain the periodic number of the extracted overlapping region; based on the base map boundary conditions, determining whether each satellite probe point is located within the extracted overlapping region within the periodic number range; if so, selecting the base map pixel position of the corresponding satellite probe point in an equal latitude and longitude grid according to the proximity principle. This invention achieves rapid extraction of overlapping regions in nested networks based on equal-viewpoint grids and equal latitude and longitude grids, filling the technical gap of existing methods that use the distance between two points for point-by-point matching within the probe range, which cannot improve matching accuracy and suffers from computational redundancy and low on-board data processing efficiency.

The invention relates to a small-dot-pitch interaction module which comprises a plurality of small-dot-pitch LED display modules, each small-dot-pitch LED display module comprises a display assembly, a capacitor assembly and a COT assembly, the display assembly comprises a display part and an induction controller, and the induction controller is installed on the display part; the display part comprises an LED lamp panel and a plurality of LED lamp beads arranged in a matrix mode, the LED lamp beads are evenly divided into a plurality of display areas, the capacitor assembly comprises a plurality of induction capacitor plates and a plurality of electric connecting pieces, each induction capacitor plate is provided with a curve type induction coil, each curve type induction coil corresponds to the induction capacitor plate and serves as a capacitor touch control unit, and the electric connecting pieces are electrically connected with the induction capacitor plates. The COT assembly comprises a plurality of insulating parts and a COT diaphragm plate, the insulating parts are arranged between the induction capacitance plate and the LED lamp panel, each electric connecting part is correspondingly connected with the curve type induction coil and is connected with the induction controller, and the COT diaphragm plate seals the surface of the display assembly and the outermost surface of the display assembly so as to assemble the complete LED display module with the small dot spacing.

A single-pass inkjet printing method comprising the steps: a) providing a substrate (S); b) forming on the substrate (S) at a printing speed higher than two meters per second (Pspeed) a monochromatic image (I), comprising a plurality of printed dots, by driving with a waveform (W) a plurality of piezoelectric printheads (H1..M), having one or more nozzle rows (R1..N), for jetting ink per printed dot of the plurality of printed dots; wherein the formed monochromatic image has a first print resolution (PRES,1) aligned the one or more nozzle rows (R1..N); and a second print resolution (PRES,2) substantially perpendicularly aligned the one or more nozzle rows (R1..N); and wherein the first print resolution (PRES,1) is more than two times the second print resolution (PRES,2); and where each printed dot of the plurality of printed dots has a dot size (Dsize) which is at least equal to a dot pitch (DPRES,2) according the second print resolution (PRES,2).

The invention discloses a monocular camera light plane calibration device and method, and belongs to the field of optical three-dimensional measurement. The invention provides a solution for actively adjusting the position of a camera in a calibration process. The device comprises a carrying substrate, a high-precision laser rotating table, a high-precision adjustable sliding rail, a high-precision camera rotating table and a connecting plate, and the height of a camera is accurately adjusted through the sliding rail. The calibration method comprises the following steps: acquiring a multi-attitude calibration plate image and laser line image pair at an initial position L1 of a camera; adjusting the camera to a position L2 and then repeatedly collecting; extracting a sub-pixel coordinate of the center of the laser stripe, and calculating a three-dimensional coordinate in combination with the pose of the calibration plate; and carrying out light plane fitting by utilizing the increased intersection point spacing at different positions. The core innovation lies in breaking through the limitation of the traditional fixed camera position, and significantly reducing the fitting error by increasing the spatial distribution of sampling points. The method has the beneficial effects that the calibration precision and robustness are greatly improved, theoretically, only one group of effective images is needed at each position, the calibration workload is greatly reduced, and the efficiency is improved.

The invention discloses a chip visual positioning method, which comprises the following steps of: 1, shooting salient points on the surface of a chip through a visual system to obtain an original salient point image, and preprocessing the original salient point image to obtain a standard image; step 2, positioning the salient points in the standard image, and determining the positioning center of the chip: firstly, taking a plurality of salient points on the surface of the chip as detection objects, and respectively measuring the distances between the detection objects and the surrounding salient points; and secondly, comparing the measured distance value with a preset standard value, if the difference between the measured distance value and the preset standard value exceeds a preset threshold value, rejecting the salient point from the detection object, and finally, determining the positioning center of the chip by taking the reserved salient point as the detection object. After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects that individual salient points which do not meet conditions are automatically removed through the design of the standard deviation threshold value of the salient point spacing, so that the whole center of the chip is more accurate.

A sensor-equipped display device is provided and includes a display panel and a detection electrode. The panel includes a display area in which pixels are arranged with a first pixel pitch in a first direction and a second pixel pitch in a second direction. The electrode includes an pattern having line fragments. The pattern has connection points at which ends of the fragments are connected to each other, and at least part of the connection points is arranged linearly such that an arrangement gaps thereof in the first and second direction is set to a first and second connection point pitch.

The utility model discloses an equal-point spacing waterproof transparent screen module, which comprises a mask, an LED circuit board and a bottom shell, the bottom shell is arranged on the back of the mask, the LED circuit board is arranged between the mask and the bottom shell, the mask is provided with a first light hole, the LED circuit board is provided with a second light hole, and the bottom shell is provided with a third light hole. The first light-transmitting holes, the second light-transmitting holes and the third light-transmitting holes are arranged in a matrix mode and correspond to one another in position, hollow light-transmitting columns are formed by extending along the inner walls of the third light-transmitting holes and inserted into the second light-transmitting holes, and sealant is poured into the bottom shell to seal the LED circuit board. The first buckle is arranged on the side face of one of the mask and the bottom shell, the first buckle position is arranged on the side face of the other one of the mask and the bottom shell, the first buckle and the first buckle position are detachably clamped together, images are displayed at equal intervals, image information is not lost, and the waterproof effect is good.

The invention discloses an MIP tube core construction structure for realizing pixel multiplication display and a preparation method of the MIP tube core construction structure, belongs to the technical field of LED display, and particularly relates to a chip-level multi-chip packaging (MIP) structure based on Micro LEDs and a pixel multiplication technology of the chip-level multi-chip packaging (MIP) structure. The problems that in the prior art, the high-resolution display cost is high due to the fact that a huge amount of transferring technology is large in difficulty and low in yield, and the reliability is reduced and the industrialization process is blocked due to the fact that the distance between pixel points is shrunk in a traditional path are solved. The structure is an MIP light-emitting unit formed by integrating a plurality of light-emitting tube cores in a packaging body. The MIP tube core construction structure for realizing pixel multiplication display and the preparation method thereof are suitable for application scenes of vehicle-mounted display, flexible screen display, oversized commercial display screens, high-definition civil display equipment and the like.

The invention relates to the technical field of finite element simulation visualization, in particular to a VTK-based finite element simulation grid point adaptive marking and interaction method, which solves the problem of adaptation of marking points under different grid densities and window sizes through window size and grid feature two-dimensional adaptive radius calculation, and solves the problem of self-adaptation of the marking points under different grid densities and window sizes through a zoom linkage compensation mechanism. The visual size stability of the mark points in the model scaling process is ensured, the interaction fluency is improved, the method is achieved based on VTK and can be integrated to various simulation software, and the efficiency and experience of user operation in finite element pre-processing and post-processing are remarkably improved; the method is suitable for a pre-processing scene and a post-processing scene of welding simulation, key grid points on a welding line track can be marked, welding path setting key point marking and auxiliary path planning can be carried out, and grid point measurement key point marking can be carried out through marking point positioning and calculation of geometric parameters such as the distance and the angle between two points.

An image forming apparatus incudes a photosensitive member, a scanning optical unit and a control portion. The scanning optical unit is provided with a light source including a plurality of light emitting points and emitting laser lights form the plurality of light emitting points, respectively and a deflector deflecting each of the laser lights emitted from the plurality of light emitting points into a scanning direction. The scanning optical unit scans the photosensitive member with the plurality of laser lights deflected by the deflector and forms an electrostatic latent image on the photosensitive member. The control portion controls the scanning optical unit. Based on information regarding a light emitting point pitch as an interval between the plurality of light emitting points, the control portion identifies the light emitting point pitch.

The present invention provides a lighting device that can prevent the dot patterns of each color projected onto the projection surface from appearing dark. [Solution] The lighting device 10 includes a diffractive optical element 50 that receives a laser beam Ray2 of visible wavelength and converts the laser beam into a group of rays Ray3 corresponding to a group of dot patterns projected onto a projection surface S. The longer the wavelength of the laser beam incident on the diffractive optical element, the larger the dot spacing of the dot pattern projected onto the projection surface, and the larger the spot size of the dot pattern projected onto the projection surface.

The invention belongs to the technical field of semiconductors, and discloses a Micro LED printing head module and a preparation method thereof, the Micro LED printing head module comprises a plurality of pixel array units and a control unit, each pixel array unit is composed of a Micro LED chip and a silicon-based driving unit, a silicon substrate of the silicon-based driving unit is provided with a micro-driving circuit array, and pins of the micro-driving circuit array are in one-to-one correspondence with the Micro LED chips. The plurality of pixel array units are divided into at least two rows, the adjacent units are arranged in a staggered row manner, and the Micro LED chips of the uplink part and the downlink part are aligned to form an overlapped pixel region; a single chip outside the overlapped pixel area corresponds to one printing pixel point, and two alignment chips in the area correspond to one printing pixel point. An image detection and processing module of the control unit can detect and adjust the brightness of two chips in the overlapped pixel area, so that the sum of the brightness of the two chips is equal to the brightness of a single chip outside the area. According to the invention, the distance between printing pixel points can be reduced, and the printing fineness of images and characters is effectively improved.

The invention discloses a plane structure-oriented airborne camera homography mapping chain calibration method. The method comprises the steps of selecting a camera, determining a flight height, planning a waypoint distance and layout, and designing a flight route. Performing trial flight in a waypoint area in the middle of a preset route, and using a natural marker for initial calibration; visible light or infrared thermal images are collected, and the collected images are preprocessed; calibrating a frame image as a reference point, and dividing an aerial image sequence into a front acquisition sequence and a rear acquisition sequence; selecting a calibration feature point from the marker; establishing a world coordinate system of the calibration frame image; a projection transformation matrix of the image coordinate system and the world coordinate system is solved, a proportionality coefficient is obtained through calculation, and calibration of the calibration frame image is completed; solving a homography matrix between adjacent frame images of a front sequence and a homography matrix between adjacent frame images of a rear sequence; constructing a homography matrix mapping chain of pixel coordinates of any frame image and the calibration frame image through matrix multiplication; solving the world coordinates of the feature points of any frame of image, and completing the calibration of each frame of image.

This invention relates to the field of measurement technology, specifically to a composite laser precision measurement method based on a unified spatial reference, comprising the following steps: S1, constructing a unified spatial reference and installing bolts; S2, using a laser sensor to perform a three-dimensional scan of the bolt ball head to obtain its surface features, with a scan line spacing of 0.1 mm and a point spacing of 0.02 mm on each line; S3, performing multi-point measurements on the bearing plane and fitting a plane equation; S4, calculating the distance from all points on the sphere to the plane using point cloud data, with the minimum value being the minimum gap; S5, if the measured value does not meet 0.3 mm, guiding the bolt rotation adjustment according to the gap distribution, repeating the steps until qualified, thus solving the problem that the gap formed by the sphere and the plane has a three-dimensional spatial distribution, resulting in the unknown location of the minimum gap point, and that when the bolt is rotated and adjusted, the surface points rotate around the axis, and the fixed position sensor measures different physical points, making it impossible to distinguish between axial displacement and tangential displacement.

The invention relates to the technical field of printing and packaging, and discloses a positioning transfer paper shrinkage deformation monitoring and fixed-length stretching compensation method which comprises the following steps: step 1, carrying out initialization calibration; step 2, carrying out real-time image acquisition and anchor point identification; 3, pixel coordinates in the image coordinate system are converted into actual physical coordinates through geometric transformation, and the actual physical distance between every two adjacent anchor points is calculated; 4, comparing the actual physical spacing with the standard spacing to obtain the spacing deviation of the single pair of anchor points; the theoretical deviation of film shrinkage is obtained in combination with the environmental factors, and deformation monitoring is conducted; 5, the linear speed difference and the tension are dynamically adjusted; 6, the linear speed difference and the tension are adjusted, and meanwhile a real-time communication protocol is established to ensure synchronism of data transmission and a control instruction; by arranging the step 2 and the step 4, the parameter space can be reduced through the preset radius range, so that 90% of invalid calculation is reduced, and the circle center voting is guided through the gradient direction to reduce invalid accumulation.

Provided is a lighting device in which a dot pattern of each color to be projected on a projection surface can be prevented from appearing dark.　A lighting device (10) comprises a diffraction optical element (50) that receives laser light (Ray2) having a wavelength in the visible range and converts the laser light into a light beam group (Ray3) corresponding to a dot pattern group to be projected on a projection surface (S). The longer the wavelength of the laser light incident on the diffraction optical element, the larger the dot interval of a dot pattern to be projected on the projection surface and the larger the spot size of the dot pattern to be projected on the projection surface.

The invention relates to a display screen lamp panel cutting method, a storage medium and lamp panel cutting equipment, and belongs to the technical field of LED display equipment manufacturing processes. The display screen lamp panel cutting method comprises the steps that a lamp panel of a display screen and plane images of wafers arrayed on the lamp panel are obtained; based on the plane image, wafers which are close to the to-be-spliced edge of the lamp panel and are arranged at intervals in the extension direction of the splicing line are selected as reference wafers; calculating the center point coordinate of the reference wafer; determining the position of a target cutting line of the lamp panel according to the center point coordinate of the reference wafer and the dot spacing of the wafers in the lamp panel, and enabling the distance from the center point of the reference wafer to the target cutting line to meet a preset spacing requirement; and controlling numerical control cutting equipment to cut the edge of the lamp panel along the target cutting line. Therefore, the positions of the edge wafers after cutting are kept consistent with the distances between the inner wafers, so that the dot distance precision after a plurality of lamp panels are spliced is consistent, and the display effect of a large-size LED display screen is remarkably improved.

This invention provides a method, apparatus, and program product for vectorizing laser-engraved images, comprising the following steps: Step 1, extracting a skeleton diagram from the target image; Step 2, breaking the line intersections in the skeleton diagram; Step 3, extracting pixel chains of each independent connected region from the broken skeleton diagram; Step 4, pixel chain recombination: merging pixel chains that meet the following conditions: the distance between the endpoints of two pixel chains is less than a distance threshold, and the collinearity and gap continuity between these two endpoints also meet preset range requirements; Step 5, fitting the recombined pixel chains to generate a vector diagram. This invention eliminates energy superposition by creating physical "breaks" at all line intersections, causing the laser head to temporarily shut down when it reaches these points and then re-emerge based on inertia after passing the intersection. This protects the silk fabric from overheating damage, achieving overheat protection for laser-engraved designs on silk fabrics.

This application provides a vehicle path planning method and apparatus based on LiDAR and camera. The method includes: performing obstacle fusion perception and semantic classification on perception data collected by LiDAR and camera equipment to determine the danger level of obstacles; during the node expansion process of the improved A* algorithm, determining the dynamic heuristic cost based on the danger level and the distance between nodes to be processed, determining the improved actual cost based on the path length and turning angle, and determining the potential field constraint cost of the path inflection point based on the repulsive force exerted by obstacles within the visible range on the path inflection point; traversing the nodes to be processed based on the improved actual cost, the dynamic heuristic cost, and the potential field constraint cost of the path inflection point to determine the parent node and the target node; and traversing back from the target node to the parent node to determine the target driving path of the target vehicle. This method improves the reliability and adaptability of path planning.

The application relates to the technical field of longitudinal beam precise stamping manufacturing control, and discloses a dotting production process of a longitudinal beam U-shaped numerical control wing surface dotting production line, which comprises the following steps: acquiring longitudinal beam theoretical dotting parameters and initializing dotting serial numbers and compensation amounts, combining a theoretical cumulative position and the compensation amounts to calculate a final dotting position, completing dotting through zoning pressure of a material pressing unit and time sequence control of pre-striking locking and post-striking releasing; subsequently, servo load data of a wing surface material pressing assembly is collected to judge a cross section stable state, pitch error and cross section stable margin are calculated under the stable state, a wing surface development error memory model is constructed or updated based on the pitch error, a final compensation amount is obtained through model prediction theoretical compensation amount and amplitude limiting combined with the stable margin, and the above steps are cyclically executed until all dotting is completed. The process improves dotting pitch consistency and double-wing symmetry accuracy, and optimizes post-stage dotting stability and production batch stability.

The invention relates to the technical field of micro-channel plates, and provides a method for rapidly forming and processing a hexagonal channel micropore array optical element based on laser point-by-point punching induced etching. The method comprises the following steps of: polishing transparent glass serving as a substrate, and processing through a photoetching process to form a hollow hexagonal array pattern on the surface of the glass substrate; then a galvanometer system is used for controlling a laser beam to punch holes point by point at an S-shaped high speed according to a certain point interval, then wet etching treatment is carried out, a laser modification area is removed, and finally photoresist at the position of the hollow hexagonal pattern is removed, so that the hexagonal channel micropore array is obtained. According to the method, a laser point-by-point punching induced etching rapid prototyping mode assisted by a photoetching mask pattern is adopted, the laser processing precision is converted into the precision of the mask pattern, and the hexagonal channel micropore array with the ultrahigh array precision of + / -0.01 microns is efficiently manufactured; the problems of leakage holes, dislocation, multifilament vertex angle distortion and multifilament boundary deformation existing in the traditional process of directly processing a hexagonal channel array by laser are solved.

This optical sheet includes a base material and a first functional layer that are laminated in a first direction. The thickness of the first functional layer is 20-250 nm. The change rate of the surface of the first functional layer on the side opposite to the base material in a cross section along the first direction is 1.02-1.19. The change rate is the ratio of the length of the surface positioned within a reference range of the cross section with respect to the length between both ends of the surface positioned within the reference range. The length between both ends of the surface positioned within the reference range is 1.3 μm.

The utility model discloses a waterproof equal pitch display module and semitransparent display leasing screen, the display module comprises a mask, an LED circuit board and a bottom shell, the bottom shell is arranged on the back of the mask, the LED circuit board is arranged between the mask and the bottom shell, the mask is provided with a first light hole, the LED circuit board is provided with a second light hole, and the first light hole is communicated with the second light hole. Third light-transmitting holes are formed in the bottom shell, the first light-transmitting holes, the second light-transmitting holes and the third light-transmitting holes are arranged in a matrix mode and correspond in position, hollow light-transmitting columns are formed along the inner walls of the third light-transmitting holes in an extending mode, the light-transmitting columns are inserted into the second light-transmitting holes, and LED lamp holes are formed in the positions, between the adjacent first light-transmitting holes, of the face cover. The LED lamp beads on the LED circuit board are located in the corresponding LED lamp holes, semitransparent display can be achieved, product wind resistance can be reduced, pixel points are connected in a matrix mode, the structure is stronger, and breaking and bending are not prone to occurring.

The invention relates to the field of three-dimensional measurement and point cloud data processing, and discloses a complex part point cloud registration method and device for blue light scanning detection of a small five-axis machine tool, and the method comprises the steps: obtaining a measurement point cloud and a CAD digital model, and building a multi-coordinate system correlation; initial alignment is carried out based on machine tool pose priori; noise suppression and structure preserving downsampling are carried out on the point cloud; constructing a self-adaptive multi-scale neighborhood according to the point spacing reference and the local stability index, and extracting features; constructing point-to-face soft correspondence by taking the CAD surface as a reference; calculating a confidence coefficient weight and carrying out weighted screening; introducing matching coverage constraint optimization corresponding set distribution; and finally, executing confidence-weighted point-to-surface precise registration, and outputting a registration result and deviation analysis information. According to the method, through fusion of pose priori, CAD guided soft correspondence, confidence weighting and coverage constraint, registration drift caused by noise, shielding and uneven distribution is effectively suppressed, and registration stability, precision and result repeatability are improved.

The application provides a focusing evaluation method, device and equipment and a readable storage medium. The method comprises the following steps: obtaining a first image by capturing a preset picture displayed on a display screen by a camera, wherein the preset picture comprises a plurality of points arranged in a matrix form; performing a point spacing reduction operation on the first image to obtain a second image; segmenting the second image to obtain a plurality of sub-images; performing two-dimensional Fourier transform on each sub-image to obtain four alternating components and one direct current component corresponding to each sub-image; and obtaining a focusing evaluation value corresponding to each sub-image based on the four alternating components and the one direct current component corresponding to each sub-image. Through the application, the focusing state of an optical system for different regions on a display screen is quantified, and the preset picture is an existing picture in a Demura repair process, without the need to add a new picture.

The application belongs to the technical field of data processing, and discloses a fire-fighting engineering inspection drawing intelligent binding and voice calling method, which comprises the following steps: obtaining drawing end points, graphic identification and water flow starting points, calculating end point spacing and topological combination to generate a feature sequence, screening close-range end points according to a function threshold and adding a region label, collecting on-site sound waves for frequency domain screening, converting voice into an inspection intent and matching end point coordinates, combining mobile terminal coordinate compensation offset to form a drawing view response coordinate; in the application, the pipe network feature sequence is generated by end point spacing calculation and topological graphic combination, the associated end points are screened according to the function threshold and the region label is superimposed, the drawing space relationship is converted into a matchable semantic graph element, the sound wave frequency domain screening is matched, the inspection intent can be directly connected to the target coordinate, and the positioning accuracy is improved through mobile terminal space coordinate compensation, the same name region interference is reduced, and the on-site voice calling stability is enhanced.

This invention discloses an LED display module, its fabrication method, and a display device. By using magnetic adsorption, the two electrodes of the LED light-emitting chip are respectively fixed to two pads within a sub-pixel region, eliminating the need for die bonding via stencil printing. This reduces costs, improves die bonding reliability, and meets the requirements for LED display devices with a pixel pitch of less than P0.5mm. Furthermore, since the magnetic poles of the two magnets within each sub-pixel region are opposite, the orientation of the LED light-emitting chip during die bonding is guaranteed to meet preset requirements, preventing reverse electrode connection during the die bonding process.

Systems, methods, and software are described which enable robust measurement of distances between 3D points, such as for pupillary distance (PD) of a wearer of corrective lenses that are known to be coplanar from a color-and-depth camera, e.g., a red-green-blue-depth (RGB-D) camera. Examples can provide a late fusion pipeline that first detects and tracks 2D landmarks in color imagery, projects those detections (detected 2D landmarks) into the depth frame, and discards measurements that appear noncoplanar and nonparallel. A user can be directed to change poses to precisely correct for nonparallel camera poses. Temporal filters can be used for the resulting distance measurements.