75 results about "Dot pitch" patented technology

The invention relates to the technical field of three-dimensional point cloud scanning, and discloses a three-dimensional laser scanner and a real-time point cloud scanning method and system, and the method comprises the following steps: setting a dot spacing, setting the rotating speed of a drive motor, and setting the transmitting frequency of a laser transmitting and receiving module; controlling the motor to rotate to drive the laser to emit laser; when laser starts to be emitted, the reading module collects angle parameters of the coded disc in real time and measures a laser flight time value through the laser flight time measuring module; combining the angle parameter, the laser flight time value and the laser reflection intensity value read in the last time of laser emission into a frame of data and storing the frame of data in an original data buffer area; reading frame data of the original data buffer area in real time, and calculating to obtain a three-dimensional coordinate; and taking the three-dimensional coordinates and the laser reflection intensity value as a frame of data and storing the frame of data in a result buffer area. The problem that the real-time application requirement is difficult to meet in the prior art is solved, and the method has the advantage of being capable of reducing the operand.

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 invention discloses an intelligent reinforced concrete vibrating method based on machine vision. The method comprises the following steps: analyzing the change of the area of a concrete mixture region in adjacent acquired images, determining a quasi-static moment in a concrete paving process, analyzing the contour characteristics of the concrete mixture region at the quasi-static moment, and determining the pixel coordinates of an approximate center point of each region. Orderly screening is carried out according to the specification requirement of the distance between the adjacent vibration points and the energy efficiency optimization target, and the pixel coordinates of the actual vibration points are obtained. According to the mapping relation between the pixel space and the driver space, driving parameters of point-by-point vibration of the mechanical arm are obtained; analyzing the surface structure and distribution characteristics of the image of the outermost ring layer of the action area of the current vibration point location in the vibration process, and obtaining the moment when the vibration quality of the current action area is qualified; the automatic detection of the quasi-static vibrating moment in the concrete paving process, the generation of ordered vibrating point positions and the automatic quality control of weak areas in the vibrating action range related to each point in the vibrating process are realized.

The invention discloses an irregular roadway colored point cloud hole filling method, and belongs to the field of underground mine three-dimensional modeling and point cloud data processing. Firstly, dense slicing is carried out on roadway point clouds, slices are projected to a two-dimensional plane for polar coordinate sorting, disordered point clouds are ordered, then the slices serve as type value points, a control point solving matrix is solved through a chasing method, initial control points are rapidly obtained, the control points are optimized through a progressive iterative approximation algorithm (PIA), and the optimal control points are obtained. The method comprises the steps of effectively reducing errors between a fitting curve and an original point cloud, performing non-uniform cubic B-spline adaptive fitting interpolation according to a point spacing to realize uniform filling of holes, and finally performing K-nearest neighbor search on interpolation points, calculating an RGB weighted average value of neighborhood points and assigning the RGB weighted average value to realize color repair of a hole region. The method has a good repairing effect on various types of holes of the irregular roadway of the mine, uniform color assignment can be carried out on point clouds at the same time, and the modeling quality and efficiency are effectively improved.

The invention discloses a small-pitch cylindrical lens grating type naked-eye 3D display system based on LEDs at equal intervals. The system comprises an LED display screen, a cylindrical lens grating and a diffusion screen, the size of the cylindrical lens grating is matched with that of the LED display screen, the cylindrical lens grating is arranged in parallel in front of a light-emitting surface of the LED display screen, and the cylindrical lens grating and the light-emitting surface of the LED display screen are arranged at an interval. According to the invention, the geometric similarity relationship is constructed according to the pixel pitch of the used LED module and in combination with the parameters such as the viewpoint number, the viewpoint pitch and the viewing distance, and the parameters such as the pitch and the focal length of the corresponding lens units are determined, so that the distance between the LED display screen and the cylindrical lens grating is greatly reduced compared with the distance between the LED display screen and the cylindrical lens grating in the traditional scheme. Moreover, the large-viewing-angle-range three-dimensional display effect of continuous viewing can be achieved, moire fringes can be inhibited, and the viewing comfort is improved.

The invention relates to the field of thick film measurement, and discloses an implementation measurement method of a thick film sample pre-fitting algorithm, comprising the following steps: step 1, establishing a model for a specific sample; step 2, inputting a film thickness value di, calculating ellipsometric angles psi and delta in a central wavelength range, and converting data into signals with 1 / lambda ([mu] m-1) as coordinates; 3, solving an average period Di at the central wavelength, and inputting different film thickness values di for multiple times to obtain a corresponding relation between the average period T and the thickness d; and 4, analyzing measurement data, and finding a thickness approximate value. According to the method, the pre-fitting time is compressed to be within 0.5 s, on one hand, when the relation between the film thickness and the distance between the adjacent extreme points of the signal is established and measurement data is analyzed, the extreme points are searched and data statistics is carried out by adopting an efficient algorithm, and the calculation time is shortened;

The application provides a laser modification processing method and a processing system for eliminating cleavage surface crack deflection. The spatial intersection line of the crystal natural cleavage surface and the macro processing surface is solved by cross multiplication operation, and the intersection line direction is locked as the laser polarization direction. The scanning direction is orthogonal to the polarization direction, and an asymmetric light intensity distribution compressing in the scanning direction and stretching in the polarization direction is constructed. A constraint model of micro-step height and laser focal depth is established, the step height is controlled to be less than the focal depth by controlling the dot spacing, the longitudinal stress is used to bridge the micro-cracks, and large-area smooth peeling is realized. The application does not need mechanical rotating parts, can effectively inhibit crack deflection, eliminate the stepped fracture caused by the inclination of the cleavage surface, and obtain a smooth peeling surface.

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.

The present invention relates to the field of inkjet printing technology, and provides an inkjet printer comprising: a paper motion control unit, an ink tank, a print head, and a control unit; the print head comprising an ignition mechanism and M inkjet channels; the M inkjet channels being arranged along the direction of paper motion, with the length of the inkjet channels being perpendicular to the direction of paper motion; the control unit instructing the print head to simultaneously ignite the nozzles of the M inkjet channels at first designated intervals, with the distance between each two adjacent inkjet channels being M×N times the unit dot pitch, for a total of N ignitions, with the distance between two adjacent ignitions of each inkjet channel along the direction of paper motion being M times the unit dot pitch, and the N ignitions constituting a group; a second designated time is paused between each group of ignitions, and multiple groups of ignitions are repeated until printing is completed; the ratio of the second designated time to the first designated time being M-1:M. This solution can effectively increase printing speed and prevent the appearance of a white line that affects printing quality.

The invention discloses an OBN seismic acquisition excitation point pitch and OBN point pitch parameter determination method, electronic equipment, a storage medium and a device. The method comprises the following steps: acquiring seismic data of a target area; constructing a three-dimensional fine geological model based on the seismic data; calculating a space sampling interval of each target stratum based on the three-dimensional fine geological model; determining a surface element grid of the target area based on the spatial sampling interval; calculating excitation point pitch and OBN point pitch parameters based on the surface element grid to obtain a plurality of excitation point pitch and OBN point pitch parameter combinations; and comprehensively analyzing the plurality of excitation dot pitch and OBN dot pitch parameter combinations, and determining an optimal excitation dot pitch and OBN dot pitch parameter combination. According to the method, the problem of determining the excitation dot pitch and OBN dot pitch parameters in the OBN acquisition scheme design process can be solved, the acquisition parameters are optimized, the imaging precision of OBN acquisition data is improved, and the OBN acquisition cost is reduced.

The application discloses a ranging method for coinciding central viewpoints of binocular PTZ cameras, solves the problem that a calibration plate cannot be used for recalibration in an online environment during three-dimensional detection of active vision, and belongs to the technical field of active vision.The application comprises the following steps: left and right cameras of binocular PTZ cameras are used to shoot target images at respective positions in a spherical cavity with various pitch angles and azimuth angles, and an angle-image encoder is obtained; during ranging, the target is shot by the left and right cameras; according to the shot images, the azimuth angle and the pitch angle corresponding to the image pair shot by the left and right cameras are found in the angle-image encoder; then, the included angles alpha0 and beta0 between the left and right cameras and the target point are obtained in combination with the geometric relationship between the positions of the left and right cameras and the target; and finally, the three-dimensional distance of the target point is solved according to alpha0, beta0 and the distance D between the position points of the rotation centers of the left and right cameras.The application can still be used for ranging when the central viewpoints coincide without self-calibration under the condition that the internal and external parameters change after the focusing and the shooting angle and range are adjusted.

The invention provides a scanning method and device, electronic equipment and a storage medium, and the method is applied to the technical field of data processing, and comprises the steps: scanning a model through employing a large-dot-pitch first scanning mode to obtain first scanning data; scanning the model by using a second scanning mode with small dot pitch to obtain a first single-frame point cloud and a first rotation translation matrix; the first scanning data, the first single-frame point cloud and the first rotation translation matrix can be used for generating the second scanning data in which boundary gaps and step phenomena are eliminated, so that the scanning effect is improved, a local fine scanning area does not need to be manually selected and deleted, and the scanning efficiency is improved.

The present invention discloses a method for measuring the curve profile of a deep blind hole based on a point spectrum confocal sensor, and belongs to the field of optical sensor technology. The measurement method includes: establishing a coordinate system for the deep blind hole, and importing the design profile of the deep blind hole into the coordinate system; combining the coordinate system and the design profile of the deep blind hole to form a trajectory line and determine the coordinates and starting point spacing of the trajectory line; providing a machine tool, on which an output shaft of the machine tool is provided a point spectrum confocal sensor, and inputting the coordinate system and trajectory line into the machine tool, so that the point spectrum confocal sensor sequentially scans the curve profile of the deep blind hole according to the trajectory line between two adjacent trajectory points, and constructs a curve with the scanned point data, starting point spacing and trajectory line in a three-dimensional model and rotates it to obtain the curve profile of the deep blind hole. The embodiment of the present invention provides a method for measuring the curve profile of a deep blind hole based on a point spectrum confocal sensor, which can obtain an accurate deep blind hole curve profile.

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 present invention relates to a method for controlling viewpoint spacing for near-eye displays capable of expanding the field of view. The method utilizes an array of output coupling elements in a waveguide system to achieve viewpoint spacing control. Multiple first output coupling elements are arranged side by side, closely aligned, and in close proximity on the waveguide surface to form an array, for multiple coupling out of first-type circularly polarized light, thereby achieving multiple first-type viewpoints. Multiple second output coupling elements are arranged side by side, closely aligned, or spaced apart, in close proximity above the first output coupling elements to form an array, for multiple coupling out of second-type circularly polarized light, thereby achieving multiple second-type viewpoints. The first and second viewpoints formed by the arrays of the first and second output coupling elements are spaced to conform to the interpupillary distance of the human eye. The diameters of the first and second output coupling elements can be up to twice the spatial spacing between the viewpoints, thereby expanding the field of view while maintaining the spatial spacing of the viewpoints consistent with the interpupillary distance of the human eye. This method achieves both a wide field of view and an appropriate viewpoint spacing.

1. Name of the design product: Graphical user interface for a radiotherapy planning system for electronic devices. 2. Use of the design product: An electronic device. 3. Design key points of the design product: Lies in the content of the graphical user interface. 4. Picture or photo that best shows the design key points: State change diagram of Design 1 interface. 5. Design 1 is designated as the basic design. 6. Use of the graphical user interface: For registering inspection images used in radiotherapy planning, delineating organs in inspection images targeted in radiotherapy planning, creating, optimizing, and evaluating radiotherapy plans. 7. Human-computer interaction method of the graphical user interface: The main view of Design 1 is a patient management interface for displaying patient information; by clicking the "Registration" button at the top of the main view of Design 1, enter the state change diagram of Design 1 interface to register different inspection images so that the same anatomical structure is in the same position; after setting the primary image (P) and secondary image (S) in multiple thumbnails displayed in the upper right corner of the state change diagram of Design 1 interface, the images of the primary image and secondary image are respectively displayed on the right side in the middle of the interface, and the image of the registration result is displayed on the left side in the middle of the interface. The main view of Design 2 is a patient management interface for displaying patient information; by clicking the "Delineation" button at the top of the main view of Design 2, enter the state change diagram of Design 2 interface to delineate the organs targeted in the radiotherapy plan; select the "New ROI Geometric Shape" button in the toolbar on the left side of the state change diagram of Design 2 interface, and delineate different organs in the image in the middle of the interface. The main view of Design 3 is a patient management interface for displaying patient information; by clicking the "Plan Design" button at the top of the main view of Design 3, enter the state change diagram of Design 3 interface, and by setting and adjusting parameters such as beam angle, isocenter, point spacing, point mode, etc., view and display the projection of the beam incident angle in the target area in the bev (beam's-eye view) view, and make it evenly distributed on the target tissue. The main view of Design 4 is a patient management interface for displaying patient information; by clicking the "Plan Optimization" button at the top of the main view of Design 4, enter the state change diagram of Design 4 interface to set and optimize the corresponding function to achieve the target prescription dose. The main view of Design 5 is a patient management interface for displaying patient information; by clicking the "Plan Evaluation" button at the top of the main view of Design 5, enter the state change diagram of Design 5 interface to compare multiple plan doses and select the best radiotherapy plan; the beam groups and dose conditions of different radiotherapy plans are displayed on the right side of the state change diagram of Design 5 interface, and the calculation results after calculating the doses of the current plan and the comparison plan are displayed in the lower part in the middle of the interface. 8. Other circumstances that need to be explained. Other explanations: In each view of Design 1 to Design 5, the grey area represents the image content screen, and the character "X" represents text and / or numbers.

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 utility model provides a small-dot-spacing LED display screen which comprises a box body support, a display module and a control box, and is characterized in that the display module is detachably fixed on the box body support; a male seat lock assembly, a female seat lock assembly and a female seat mounting clamping position are arranged on the box body support, the male seat lock assembly is arranged on one side of the box body support, and the female seat lock assembly is arranged on the other side of the box body support; the female seat lock assembly comprises a female seat and a female seat mounting seat, the female seat is fixed on the female seat mounting seat, the female seat mounting seat is fixed on the female seat mounting clamping position, and the male seat lock assembly and the female seat lock assembly are buckled and fixed, so that adjacent LED display screens are connected; the control box is detachably fixed to the middle of the box body support. The mother lock seat is arranged in the LED display screen box body support, the structure is novel, and maintenance is convenient.

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.

The invention belongs to the technical field of image data processing, and particularly relates to a scribed line measuring method based on 3D vision. The method comprises the steps that a 3D camera collects data and refills abnormal values in an output depth map into normal values; drawing a straight line on the depth map along the scribed line direction, and calculating a line width compensation angle and a rectangular inclination angle of the measurement area; a flat regular rectangle is drawn on the depth map and used for roughly positioning edge points of the scribed lines, and at least two edge points are detected on each scribed line to be used for follow-up fine positioning of the edge points; combining the plurality of coarse positioning edge points on the same scribed line into one fine positioning edge point according to the set maximum point spacing; according to the fine positioning edge points and the rectangular measurement area, obtaining a 3D profile contour of the scribed line; and calculating the depth and width of the scribed line according to each 3D profile contour of the scribed line slot. The invention provides a scribed line measuring method based on 3D vision. The scribed line width and depth can be accurately and efficiently measured.