41 results about "Checkerboard pattern" patented technology

Techniques of calibrating telepresence videoconferencing displays and cameras include providing 6 DoF camera locations and orientation vectors in display reference frame based on a plurality of images that indicate specified mirror-plane points of a mirror and specified reflected display plane points. In some implementations, the specified mirror-plane points are located at fiducial markers printed on the mirror. In some implementations, the specified reflected display plane points are located in a checkerboard pattern of fiducial markers on the display.

The invention discloses a method for improving the moisture infiltration capacity of urban green land soil. The method comprises the following steps that S1, according to design requirements, a foundation is excavated, earthwork is cleaned, the foundation is leveled and divided in a checkerboard mode, and an air pump device is used for aerating the foundation in checkerboard checks; s2, crushing the construction waste: crushing the engineering muck, the engineering slurry, the engineering waste, the demolition waste and the decoration waste into coarse grains with the grain size of 30-50mm, removing metal in the coarse grains, paving the coarse grains on a foundation, and leveling and compacting to form a permeable layer; s3, a starch solution is injected into the permeable layer, glucose is formed after the starch solution is hydrolyzed in the permeable layer, acetic acid is formed after the glucose is alcoholized, hydroformylated and acidified, and the acetic acid reacts with carbonate in the permeable layer to generate water-soluble substances which are consumed, so that the porosity of the permeable layer is improved. The problem that urban inland inundation is prone to occurring due to the fact that urban green land permeability is poor can be solved.

A method of performing an operation on a memory device is disclosed. The method of performing an operation on a memory device includes the following steps. An erasing operation is performed on a selected word line of the memory device to lower threshold voltages of a plurality of first memory cells to be programmed and a plurality of second memory cells to be erased below a first predetermined level. A programming operation of a checkerboard pattern is performed on the selected word line such that the first memory cells are subjected to a first programming bias and the second memory cells are subjected to a second programming bias. The second programming bias is lower than the first programming bias.

An alignment mark formed by a plurality of first components each having a rectangular shape and a plurality of second components each having a rectangular shape are arrayed in a checkerboard pattern. Each first component is formed from a flat region. Each second component is formed from a line-and-space pattern having a periodicity in a first direction. A length of the first component in the first direction is an odd multiple of a half pitch of the line-and-space pattern. The line-and-space pattern of each second component is line-symmetric with respect to a straight line passing through a center of the second component in parallel to a second direction orthogonal to the first direction.

The utility model discloses a machine vision calibration board with sine characteristic lines, comprising a rectangular substrate, the surface of the rectangular substrate is provided with uniformly distributed checkerboard patterns, the central area of the rectangular substrate is provided with a sine curve characteristic line penetrating through the calibration board, four corners of the rectangular substrate are provided with concentric circle positioning marks, and the concentric circle positioning marks are provided with concentric circle positioning marks. Round identification marks are arranged on intersection points of the sine curve characteristic lines and the checkerboard pattern. Concentric circle marks are arranged at four corners of the calibration plate and are used for rapid positioning and direction identification. Small dots are arranged on the intersection points of the sine curve and the checkerboard lines and used for verifying the feature point recognition accuracy. According to the utility model, the calibration precision is improved; various distortions are more comprehensively corrected by combining linear and curve characteristics; the calibration quality is ensured through feature verification points; the positioning marks are convenient to align quickly, so that the operation time is shortened; and the method is suitable for various industrial visual systems, including two-dimensional and three-dimensional applications.

The utility model relates to the field of desert control equipment, and discloses a mechanical device for laying grass checks in desert, which comprises a frame mechanism, a storage and feeding mechanism, a grass binding mechanism, a traveling mechanism and a compacting mechanism, the problems that a traditional mechanical device is prone to slipping and sinking when walking in the desert are solved, meanwhile, the shock absorption system can relieve the conditions of vibration, jolting and the like when the device works, the grass pricking mechanism is formed by improving a frog type tamping machine, the effect of deeply pricking grass can be achieved through inertia, dependence on a motor is reduced, energy consumption is reduced, and the service life of the grass pricking mechanism is prolonged. The working efficiency is improved, the overall balance is improved through the symmetrical distribution structure, the storage and feeding mechanism is of the pointed-cone-shaped idler wheel stock bin design, the problem that materials are prone to being wound and blocked in the feeding process of a traditional material box is solved through the design, the feeding efficiency of the material box is improved, and the discharging amount of a feeding opening can be controlled by adjusting the rotating speed.

This product is a partition exhibiting a checkerboard pattern with rectangular panels and blank spaces arranged vertically and horizontally. It consists of two concave-shaped disc-like bodies: one at the top with a rectangular panel main section arranged with a rectangular panel and a blank space; two at the next lower position with a rectangular panel at the center and blank space main sections arranged alternately in five rows, with a rectangular panel at the bottom; and one convex-shaped disc-like body at the bottom with a blank space at the bottom, arranged with a rectangular panel at the center and blank space main sections arranged alternately in five rows. Each of these three disc-like bodies is connected at the ends of the upper end grain of the rectangular panels at four points on the sides of the rectangular panels that correspond to the concave and convex sections of the rectangular panels, and can be folded at an angle in the range of 180 to 120 degrees to be erected for use. The rectangular panels are made of natural dark wood, or decorated in deep colors such as black, red, or green, with a thickness of 8-15 mm, a length of 150-300 mm, and a width of 100-200 mm. The overall design features a checkerboard pattern with 30-40% open space, forming a partition.

Embodiments of the present application provide a method, apparatus, and mobile terminal for obtaining radial distortion parameter values. The method includes: obtaining an original checkerboard image, where the original checkerboard image is obtained by shooting a checkerboard pattern through a lens; extracting corner points on the original checkerboard image, and obtaining target checkerboard coordinate values of at least some corner points with the optical center as the coordinate origin; obtaining the radial distortion parameter values of the lens through the target checkerboard coordinate values. In some embodiments of the present application, for a radial distortion scenario, only with the assistance of a film, rubber head, display screen, etc., collecting a checkerboard image can obtain the radial distortion parameter values of the lens module and thus complete radial distortion calibration. The algorithms for the radial distortion parameter values in some embodiments of the present application have high robustness.

The utility model discloses a machine vision calibration board with a plurality of horizontal and vertical sine curves, which comprises a rectangular substrate, the surface of the rectangular substrate is provided with uniformly distributed checkerboard patterns, the area of the checkerboard patterns is provided with a plurality of sine curves parallel to the horizontal and vertical directions to form a gridding fluctuation characteristic line structure, and the sine curves are arranged on the rectangular substrate. Four corners of the rectangular substrate are provided with concentric circle positioning marks. According to the utility model, after a sine curve is introduced as a characteristic line, continuous curve characteristics can be provided, and modeling of nonlinear distortion and visual angle change is facilitated. The four-corner concentric circle positioning marks are used for assisting image rapid positioning and direction verification.

A technology is provided that can contribute to improving the performance of a light-emitting device that has a layer made of metal oxide nanoparticles between a cathode and an anode. [Solution] A method for forming a printed layer includes forming a coating film on the surface of the substrate by performing relative movement between an inkjet head and a substrate and ejecting an inkjet ink composition from the inkjet head, wherein the inkjet ink composition comprises metal oxide nanoparticles made of a material selected from the group consisting of hole injection materials, hole transport materials, and electron transport materials, and a dispersion medium containing a glycol-based solvent, and the relative movement and ejection are performed such that the landing positions of the inkjet ink composition on the surface form a checkerboard pattern and the dots made of the inkjet ink composition that have landed on the surface merge with each other.

The present invention relates to the field of spectral imaging, and particularly to a checkerboard Fabry-Perot interferometric snapshot imaging spectrometer, which includes a telescopic system, a microlens array, a Fabry-Perot array interferometric system, and a planar array detector. The telescopic system is used to collect the target light field and perform field-of-view limitation and collimation on the target light field. The Fabry-Perot array interferometric system is used to modulate the target light field into an interference light field array, which includes a parallel flat plate and a checkerboard stepped mirror. The step heights are distributed in a two-dimensional decreasing checkerboard pattern. An air gap with a two-dimensional increasing thickness is formed between the parallel flat plate and the checkerboard stepped mirror. The thickness of each region of the air gap corresponds to an optical path difference respectively. The microlens array is used to image the interference light field array onto the planar array detector through each imaging channel. The planar array detector is used to receive the transmitted image field of the microlens array to obtain an interference image array. The present invention has the advantages of small volume, light weight, compact structure, static state, stability, and reliability, etc.

This application provides a method and system for calibrating three-dimensional deformation structured light measurement. The system includes a projector, a camera, a checkerboard target, a control device, and a translation stage. The checkerboard target is mounted on the translation stage, with one checkerboard pattern being red and another being magenta. The control device is configured to control the projector to project a preset monochromatic red stripe image or white light onto the checkerboard target when calibrating the in-plane coordinates or height coordinates of a three-dimensional deformation measurement space, and to control the translation stage to move multiple times along the height direction of the checkerboard target, each movement being performed at a preset interval. The control device is also configured to obtain three-dimensional calibration data corresponding to the checkerboard target and determine calibration coefficients in a preset optical path measurement model based on the three-dimensional calibration data. The system of this application achieves high-efficiency and high-precision calibration.

The present invention provides a photoelectrically coupled CMP polishing pad, comprising: a base pad having a plurality of first and second accommodating areas arranged in a cross pattern. The first and second accommodating areas divide one end surface of the base pad into a plurality of polishing sections arranged in a checkerboard pattern. The first accommodating areas are used to accommodate light strips, and the second accommodating areas are used to accommodate or expose metal parts, with no interference between the metal parts and the light strips. The present invention utilizes the photoelectric field effect to improve polishing efficiency. Furthermore, through a rational checkerboard-like structure, the exposed area of ​​the metal parts and the polishing area are allocated, preventing the deposition of silicon dioxide, ensuring the removal of SiC, and improving polishing efficiency.

The invention discloses a reflective surface imaging method based on displacement checkerboard composite illumination. According to the method, an electronic display screen is used as an area light source, and relative positions of the light source, a camera and a target surface are fixed in an imaging process. A plurality of black and white checkerboard patterns are sequentially projected to the surface of a target by an area light source, and corresponding images are synchronously acquired by a camera. And the checkerboard pattern shifts along three preset directions by taking half of the width of the checkerboard as a step length, and eight illumination patterns are formed in total. Thirdly, counting the maximum value and the minimum value of the brightness of the collected multiple images pixel by pixel, and calculating a target image after reflection suppression based on the extreme value information; the method can effectively inhibit the interference of the highlight of the reflective surface on imaging, is simple and efficient in calculation process, is low in cost, is easy to deploy, and can meet the requirements of practical application.

To provide a technique related to an alignment mark suitable for being arranged on a substrate on which line-and-space patterns are uniformly formed.SOLUTION: An alignment mark is formed by arranging a plurality of first components having a rectangular shape and a plurality of second components having a rectangular shape in a checkerboard state. Each first component is formed of a flat area, and each second component is formed of a line-and-space pattern having periodicity in a first direction. The length of the first components in the first direction is the odd-number multiple of a half pitch of the line-and-space pattern. The line-and-space pattern of each second component is line symmetrical with respect to a straight line passing through the center of the second component parallel to a second direction orthogonal to the first direction.SELECTED DRAWING: Figure 4

The fabric with the weft-knitted checkerboard lines is formed by weaving first yarns and second yarns, the fabric with the weft knitting checkerboard pattern has a structure which is obtained by circulating needle rows of 2-2-1-1 / 1-1-2-2 and needle rows of (1)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v)-(v / v). The first yarn is formed by mixing 70D extinction high-elastic chinlon with 30D semi-gloss filament chinlon, and the second yarn is 20D spandex. According to the fabric with the weft-knitted checkerboard patterns, the structure of the mixed dull chinlon and the semi-dull chinlon is adopted, the first yarn is formed after mixing and serves as spinning yarn, meanwhile, the high-elasticity 20D spandex serves as the second yarn, and the fabric is obtained by adopting 2-2-1-1 / 1-1-2-2 pin headers and 8-step circulating triangles, so that the fabric has the advantages of being good in smoothness, high in elasticity, good in elasticity, high in elasticity, good in elasticity and the like. And the elastic fabric has the advantages of being stiff and stylish when being used for manufacturing men's clothes, fashionable clothes and the like.

This invention provides an underwater immersed tube positioning and monitoring method, a docking monitoring method, and related equipment. By pre-setting a black and white checkerboard pattern on the immersed tube and using an underwater robot equipped with a binocular camera to photograph and identify the checkerboard pattern, reliable calculation of the immersed tube's position and attitude can be achieved in complex underwater environments. Compared to existing assisted positioning methods using active laser targets, this invention utilizes a black and white checkerboard pattern as a passive visual marker, which has the advantages of simple structure, low manufacturing cost, convenient deployment, and no need for retrieval. It can effectively reduce the investment in underwater construction auxiliary equipment and work processes. Combined with underwater robot operations, it can also reduce the risks of manual underwater operations and improve the safety, practicality, and engineering economy of immersed tube positioning and monitoring.

To provide a hydroponic cultivation device and the like that facilitate operation of filling a nutrient solution.SOLUTION: A hydroponic cultivation device 100 includes: a tray section 10 that has an open top and forms a nutrient solution storage space 11 for storing a nutrient solution LQ, the tray section being rectangular in plan view; and a cover section 20 that is plate-shaped, sized to close the nutrient solution storage space 11, and formed with a plurality of openings 26 for inserting and holding pot sections 30 in which seedlings of plants PL are planted. The cover section 20 has the openings 26 arranged in a grid pattern, and a distance D1 from a first longitudinal edge 21 to the opening 26 nearest to the first longitudinal edge 21 is set longer than a distance D2 from a second longitudinal edge 22 to the opening 26 nearest to the second longitudinal edge 22. As a result, the tray section 10, which is closed at the top by the cover section 20 holding the pot sections 30 in a state where their bottoms are suspended, can advantageously be slid open to facilitate the work of supplying the nutrient solution LQ into the nutrient solution storage space 11.SELECTED DRAWING: Figure 7

This invention discloses a method and apparatus for calibrating a telecentric structured light system based on the geometric center of a checkerboard pattern. The method includes: selecting test calibration board images from a set of calibration board images; performing image edge detection and binarization based on the Sobel operator to obtain a binarized edge map; performing line detection based on the Hough transform, calculating the rotation correction angles corresponding to the vertical lines of the checkerboard pattern, and constructing a rotation matrix using the rotation correction angles; constructing a standard checkerboard pattern template based on ROI selection and edge expansion processing of the test calibration board images; performing normalization processing on each calibration board image, and then performing template matching and sub-pixel-level center localization with the standard checkerboard pattern template to finally determine the center coordinates of the checkerboard pattern in the corresponding calibration board image as feature point coordinates; and using the rotation matrix to perform attitude correction on the feature point coordinates of each calibration board image, thereby calibrating the telecentric structured light system. This invention can significantly improve calibration accuracy and stability.

1. The name of the product under this design: Slippers (cross checkerboard pattern). 2. Purpose of the product of this design: slippers worn on the feet. 3. The key design point of this design product lies in the combination of shape and pattern. 4. The picture or photo that best illustrates the key points of the design: main view.

This invention relates to a method for calculating the verticality of a measuring instrument stage, a terminal device, and a storage medium. The method includes: S1: acquiring a checkerboard image corresponding to a checkerboard pattern image placed on the stage using an image acquisition module; S2: using the corner points of the checkerboard pattern in the checkerboard image as pixel coordinate points, and obtaining the coordinates of each pixel coordinate point in the camera coordinate system; S3: establishing a world coordinate system based on the horizontal and vertical directions of the checkerboard pattern, and calculating the coordinates of each pixel coordinate point in the world coordinate system according to the size of the checkerboard pattern; S4: constructing a mathematical model and calculating R... 11 and R 22 Value: S5: Calculate verticality. This invention reduces calculation errors caused by mechanical installation errors by directly acquiring images of objects on the platform and calculating the corresponding verticality.

The present invention relates to a camera calibration system for correcting a camera image. The camera calibration system comprises: a reference target unit including a laser module which acquires a plurality of reference light patterns or a test chart on which a checkerboard pattern is printed; a camera configured to acquire the original data or correction data by photographing the reference target unit at one or more time points; and a correction result processing and display device configured to acquire result data on the basis of the acquired original data or correction data, wherein the correction result processing and display device comprises: a communication unit for receiving the correction data from the camera; and a processor unit for processing the received correction data.

The invention provides an image processing method and system. According to the method, on a coding side, information of Alpha channel data is equally divided into first Alpha channel sampling data and second Alpha channel sampling data through a first checkerboard pattern and a second checkerboard pattern, and half of information of first channel data in RGB three-channel data is divided into the first channel sampling data according to the first checkerboard pattern; dividing the other half of information of second channel data in the RGB three-channel data into second channel sampling data according to a second checkerboard pattern, and recoding the first Alpha channel sampling data, the first channel sampling data and the first checkerboard pattern into first channel data, and recoding the second Alpha channel sampling data, the second channel sampling data and the second checkerboard pattern into second channel data and sending the second channel data to the decoding side, and reconstructing an ARGB four-channel image on the decoding side. According to the method, the problem of different degrees of distortion of the reconstructed ARGB four-channel image can be improved.

This invention proposes a method for uncoupling a train using a robot, belonging to the field of train uncoupling technology. The method involves collecting the position and speed of the train carriage, and simultaneously determining whether the carriage has entered the robot's grasping window. If the carriage has not entered the window, but the robot has, the camera is activated and acquires RGB and depth images. The depth image is then registered to the color image, and the point cloud coordinates of the coupler are calculated. The robot receives the grasping path and executes the grasping action according to the order of the points forming the path. Once the carriage is uncoupled, the robot's grasping action is complete. The acquisition of RGB and depth images utilizes a perspective projection model and Zhang Zhengyou calibration method to acquire multiple sets of checkerboard patterns. This method overcomes the challenges of complex uncoupling environments, numerous obstacles, short uncoupling windows, and unfavorable lighting conditions that can lead to uncoupling failures.

1. Name of the product in this design: Decorative veneer (checkerboard pattern). 2. Purpose of this design: For the decoration of the exterior of furniture, decorative panels and other household products. 3. The key design features of this product are the combination of pattern and color. 4. The image or photograph that best illustrates the design's key features: the front view. 5. The design for which protection is sought includes color. 6. This design is a two-dimensional product; rear, left, right, top, bottom views, and perspective views are omitted. 7. This design is a planar product with continuous four sides and no defined boundaries.

This invention discloses a cabin relative pose detection system and calibration method based on non-cooperative assembly characteristics, belonging to the field of automated docking and assembly technology for large cabin sections. The method first uses a laser tracker as a spatial reference to perform nonlinear error calibration and optimal measurement position compensation on multiple displacement sensors in the measuring device. Then, by pushing a calibration plate and simultaneously acquiring images from a vision camera, a mapping relationship between image pixel size and spatial distance is established. Finally, the in-situ calibration of the measuring device is completed. This invention eliminates the need for complex camera parameter calibration using checkerboard patterns or dedicated targets. Through sensor data fusion and spatial mapping, it achieves high-precision and high-efficiency relative pose calculation of cabin non-cooperative assembly characteristics. This method is applicable to flexible assembly scenarios of multiple types and varying batches of cabin sections, effectively improving the assembly quality and consistency of aerospace products such as missiles.

The present invention discloses a stealth metasurface compatible with radar RCS reduction and adjustable infrared emissivity, relating to the technical field of multi-spectrum stealth. The present invention comprises a structure formed by multiple annular ITO patches with different duty cycles, which is etched in a checkerboard pattern on a four-part PET plate to form a functional layer, and a stealth metasurface formed together with a heat insulation layer, a reflective backplane, and a dielectric layer. When electromagnetic waves in the microwave frequency band are incident on the stealth metasurface, the specific arrangement of the annular ITO patches causes the electromagnetic waves to respond in phase and reflect in different directions, thereby achieving radar diffuse reflection stealth. The adjustability of the infrared emissivity is characterized by changing the duty cycle of the annular ITO patch unit while ensuring that microwave stealth performance is met. The larger the ITO duty cycle, the lower the infrared emissivity. The overall radar RCS reduction and adjustable infrared emissivity are organically combined, and bidirectional adjustment can be performed according to demand.

This makes it easier to obtain surveying results with higher accuracy than with photogrammetry using a surveying staff according to conventional technology. [Solution] The surveying system 1 includes a surveying staff 11S and a surveying staff 11T fixedly positioned on the object to be surveyed 9 so as to sandwich a crack 91 between them, a terminal device 12 equipped with a camera that takes photographs so that the surveying staff 11S and the surveying staff 11T fit within its field of view, and a server device 13 that receives from the terminal device 12 coordinates of surveying points identified by the terminal device 12 through photogrammetry and stores them as historical data. The surveying staffs 11S and 11T are painted with a non-rotationally symmetric checkerboard pattern, and multiple intersections are formed by the boundaries of adjacent areas painted in different colors that make up the checkerboard pattern. The terminal device 12 identifies these intersections from the images captured by the camera, and from these identified intersections, determines the coordinates of the surveying points in a coordinate system with a reference point as the origin.

Symbol multiplexing Physical Medium Attachment (PMA) may be provided. A plurality of first lanes may be received and then Alignment Markers (AMs) from the plurality of first lanes may be used to determine symbol boundaries and identify the plurality of first lanes. Next, groups of the plurality of first lanes may be de-skewed and checkerboard patterns in the plurality of first lanes may be undone. Then the plurality of first lanes may be symbol-wise multiplexed to a plurality of second lanes. The plurality of second lanes may then be sent.

The present invention belongs to the technical field of reversible information hiding and provides a reversible information hiding method and system based on image texture-guided prediction. The method includes allocating image pixels according to a checkerboard pattern to divide them into shadow layers and blank layers; calculating the prediction errors and fluctuation values ​​of all pixels in the shadow layer to construct a prediction error histogram for the shadow layer; calculating the prediction errors and fluctuation values ​​of all pixels in the blank layer to construct a prediction error histogram for the blank layer; obtaining a secret-carrying shadow layer based on the prediction error histogram of the shadow layer and the fluctuation sequence of the shadow layer; obtaining a secret-carrying blank layer based on the prediction error histogram of the blank layer and the fluctuation sequence of the blank layer; and combining the secret-carrying shadow layer and the secret-carrying blank layer to obtain a secret-carrying image.