17 results about "Checkerboard pattern" patented technology

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.

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 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.

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.

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.

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.

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.

This invention discloses a low RCS circularly polarized slot array antenna with a metasurface, comprising an upper dielectric substrate and a lower dielectric substrate. The upper dielectric substrate has a polarization conversion metasurface printed on its upper surface, and a metal ground plane is printed on the upper surface of the lower dielectric substrate. A feeding structure is printed on the lower surface of the lower dielectric substrate. The polarization conversion metasurface is composed of passive resonant polarization conversion elements arranged in an N×N checkerboard pattern, where N≥6. The metal ground plane is etched with a checkerboard-patterned slot array antenna. This invention achieves a reduction in antenna RCS while simultaneously broadening the operating frequency band of the metasurface and improving the polarization conversion efficiency.

The application discloses a high-robustness and high-precision camera calibration board and an angle point detection method. The method comprises the following steps: forming an expected calibration board by combining an ArUco code pattern and a black-and-white checkerboard pattern; establishing a calibration board coordinate system and setting an ArUco code pattern angle point in the calibration board coordinate; collecting a calibration board image to obtain a pixel coordinate of the ArUco code pattern angle point; using the calibration board coordinate and the pixel coordinate to solve a projection transformation matrix T from the calibration board coordinate system to a pixel coordinate system; using the projection transformation matrix T and a known model of the calibration board to calculate a pixel coordinate of a black-and-white checkerboard angle point; and using a sub-pixel algorithm to obtain an accurate pixel coordinate of the black-and-white checkerboard angle point. The application solves the problems of low accuracy of the ArUco code pattern angle point coordinate, a small number of angle points, and the black-and-white checkerboard pattern being easily affected by environmental interference, a placing posture, backlight, local shadow and the like, leading to detection failure and angle point loss.

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.

This invention provides a method, apparatus, medium, and device for determining distortion parameters of a camera module. The method requires only capturing one image of a checkerboard pattern and performing anti-distortion processing on the corner points of the checkerboard image to reduce deviations caused by image distortion. Furthermore, through homography matrix transformation, perspective distortion caused by the shooting angle is reduced, minimizing the impact of perspective interference on distortion parameters. Then, through fine-tuning of distortion parameters, anti-distortion processing, and closed-loop processing of matrix deviation, the distortion parameters are ensured to always be optimized towards the direction of minimum deviation. The final target distortion parameters closely match the true distortion characteristics of the camera module under test, ensuring the accuracy of distortion parameter determination. The entire testing process does not require limiting the shooting environment or capturing multiple images for analysis, making the operation relatively simple and thus improving the efficiency of distortion parameter determination.

Convolution-Hierarchical Deep-learning Neural Network-Tensor decomposition (C-HiDeNN-TD) has four features: (1) Tensor decomposition breaking down the whole design into small tractable problems; (2) Convolution built-in filter to increase accuracy without adding extra DoFs; (3) Convolution built-in filter can avoid checkerboard pattern; (4) Design can have arbitrary smoothness without adding extra DoFs.