315 results about "Gray level image" patented technology

The invention relates to the technical field of image detection, in particular to a PCBA board defect detection method and system based on image processing, and the method comprises the following steps: carrying out the meshing calculation of a gray scale deviation after a gray scale image is subjected to Gaussian filtering denoising, generating change rate data, carrying out the statistics of a frequency number, constructing a histogram, combining with an Otsu algorithm, and generating a candidate mask; extracting pixels based on a mask, calculating a gradient modulus, screening edge candidate points, carrying out gradient direction connection and morphological processing to generate a complete edge structure, expanding a connected domain through a region growing algorithm, aligning the connected domain with a template contour, and outputting defect coordinates. According to the method, the defect identification sensitivity is improved through combination of gray level image gridding processing and dynamic threshold calculation, a candidate mask is generated through grid gray level change rate statistics and an Otsu algorithm to avoid over-segmentation missing detection, and the contour precision is improved through combination of gradient modulus difference screening and morphological closed operation optimization. The region growing algorithm and template dynamic alignment reduce deformation misjudgment, and staged dimension reduction and feature enhancement reduce calculation complexity and solve resource waste.

The invention relates to the technical field of membrane material image processing, in particular to a membrane material surface treatment defect detection method and system based on image recognition, and the method comprises the following steps: collecting a membrane material surface image, carrying out the statistics of the frequency of gray levels in a gray level image, and obtaining the gray level distribution information of the membrane material surface image; and dividing the membrane material surface image into a plurality of local areas with the same size, calculating a gray level distribution entropy value in each local area, and generating a membrane material surface local area analysis result. According to the method, the membrane material surface image is converted into the gray level image, the gray level frequency is counted, fine gray level distribution information is obtained, preliminary region division of the surface image is achieved, and the positioning accuracy of potential defects is improved. The gray level distribution entropy value of the local area is used as a defect evaluation index, and a potential defect area is accurately marked by combining a preset distribution threshold value, so that the sensitivity of defect detection is effectively improved.

The invention relates to the technical field of solar irradiance prediction, and discloses a solar irradiance prediction method and system based on data fusion, and the method comprises the steps: obtaining a cloud layer gray image, a wind speed vector, a terrain elevation, a slope inclination angle, a solar azimuth angle and an elevation angle, calculating the movement speed and direction of a cloud layer based on the cloud layer image and the wind speed vector, and obtaining a prediction result. Calculating a shielding path in combination with a terrain elevation and a sun position; generating a terrain shielding influence coefficient matrix; fusing a gradient and shielding data to generate a dynamic effect graph; performing cloud-ground shielding analysis based on the dynamic effect graph and a cloud trajectory to obtain cloud-ground coupling influence distribution; using a random forest algorithm to fuse the coupling distribution and the shielding coefficient to calculate an initial irradiance probability, and forming a preliminary prediction result; and inputting the time sequence prediction model, the cloud trajectory and the shielding coefficient into a trained time sequence prediction network, and outputting an optimization result. According to the method, prediction requirements under complex terrains and rapid weather changes can be met.

The invention relates to the technical field of image processing, in particular to a cable defect detection method and system based on image processing, and the method comprises the steps: obtaining a gray level image of a cable, correcting a preset strong edge threshold value according to the illumination influence degree of any row of pixel points in the gray level image, obtaining the strong edge threshold value of the row of pixel points, and obtaining the strong edge threshold value of the row of pixel points; and taking a median among the fifty-th percentile, the ninety-th percentile and the strong edge threshold values of the pixel point gradient values in the gray level image as the optimal strong edge threshold value of the pixel points in the row, and based on the optimal strong edge threshold value of the pixel points in each row and a preset weak edge threshold value, performing edge detection on the gray level image by using a # imgabs0 # algorithm, and detecting cable defects according to a comparison result of the obtained number of the connected domains and a preset threshold value. According to the invention, the accuracy of cable defect detection can be improved.

The invention relates to the technical field of mode recognition and data recognition, and discloses an intelligent visual detection method for non-standard precision part surface microdefects, which comprises the following steps: acquiring surface gray level image data of a to-be-detected part, physically abandoning low-frequency components through discrete wavelet transform, and reserving high-frequency detail components to construct a frequency domain input tensor; constructing a double-flow reconstruction model containing a space domain coding network and a frequency domain coding network, and minimizing the distribution difference of the same feature between double-domain characterization through potential feature space consistency constraint joint optimization; the method comprises the following steps of: calculating a spatial domain residual image and a frequency domain residual image, combining a texture topological residual image extracted by structural tensor characteristic decomposition, and generating a comprehensive abnormal response image through weighted fusion to judge the defect, and effectively inhibiting macroscopic geometric contour interference through frequency domain decoupling and a topological check mechanism on the premise of not needing a standard geometric template. And sensitive perception and accurate identification of weak texture defects on the surface of the non-standard part are realized.

The invention discloses a projection single attitude calibration method, system and device and a medium, and relates to the technical field of computer vision and projection interaction.The method comprises the steps that a plurality of calibration patterns are generated and projected to a calibration plane, gray level images are collected, corner point detection and sub-pixel refinement processing are carried out, and a projection single attitude calibration result is obtained. The method comprises the following steps: acquiring an angular point corresponding relation between a projector image and a camera image, carrying out iterative solution on a projection matrix of a projector and a projection matrix of a camera, separating an internal parameter matrix and an external parameter matrix, calculating a basic matrix and an essential matrix, and decomposing to obtain a rotation matrix and a translation vector of the camera relative to the projector; camera imaging distortion is estimated, a distortion correction coefficient is obtained, and distortion correction is carried out; and counting a re-projection error generated in the correction process, and adjusting parameters of the projector and the camera until the error meets a preset precision requirement. Projector parameter calculation is completed through projection single posture calibration, posture adjustment is not needed in the calibration process, the automation degree is improved, and meanwhile manual intervention is reduced.

The invention discloses a breast cancer pathological image segmentation method, and relates to the technical field of medical image processing. Comprising the steps of inputting a to-be-segmented breast cancer medical image and performing initialization; according to the breast cancer image to be segmented, obtaining a gray level image of the breast cancer image; performing non-local mean filtering operation on the grayscale image, and forming a two-dimensional histogram by the non-local mean filtering image and the grayscale image; based on the constructed two-dimensional histogram, taking a Renyi entropy as a target function, and using an improved backtracking search optimization algorithm as a search method to search an optimal segmentation threshold combination; performing multi-threshold image segmentation on the breast cancer image to be segmented by using the searched optimal threshold combination, and outputting a segmentation result; according to the improved backtracking search optimization algorithm, a random reselection strategy is introduced to help the algorithm to avoid local optimum and effectively improve the exploration capability of the algorithm, and meanwhile, a quality enhancement mechanism is adopted to enhance the quality of candidate solutions and keep certain randomness at the same time.

The invention discloses a power equipment defect intelligent identification method, system and device and a medium, and the method comprises the steps: collecting an original image of power equipment, and screening the original image of the power equipment to obtain a channel image; carrying out enhancement processing on the channel image and then calculating a gray scale difference value to obtain a gray scale image; converting the gray level image into a frequency spectrum image by adopting fast Fourier transform, and constructing a Gaussian filtering function to carry out convolution and inverse transformation on the frequency spectrum image to obtain a spatial domain image; and performing adaptive threshold segmentation on the spatial domain image, dividing the image into a defect area and a non-defect area, obtaining a segmented image, and performing morphological processing on the segmented image to obtain an electrical equipment defect identification result. According to the method, the problem of aliasing in traditional spatial domain processing is solved, the defect area is accurately extracted, short-time interference and real defects can be effectively distinguished, and the segmentation accuracy is improved.

The invention discloses a hydraulic system intelligent fault diagnosis method based on a diffusion model data enhancement framework, and the method comprises the following steps: firstly providing a diffusion model-based data enhancement framework, carrying out the fault simulation of a hydraulic system through a simulation model, converting a time domain signal into a gray image, and achieving the data enhancement through a diffusion model; carrying out quantitative evaluation on the quality of the generated image, and constructing an enhanced hydraulic system fault data set; based on the proposed framework, a dual-domain adversarial neural network model fused with an attention mechanism is proposed, the weight of a loss function of two domain discriminators is adjusted so as to realize global and local feature adaptive fusion optimization, adversarial training is realized through a gradient inversion layer, and the adaptive fusion optimization of global and local features is realized. Experimental fault state data serve as a test set to be input into a model for fault diagnosis, and the superiority of the method on indexes such as accuracy is verified through comparison of traditional models such as DANN and CNN. In addition, the method is simple and easy to implement, and is suitable for intelligent fault diagnosis of the hydraulic system under the zero sample condition.

The invention discloses a breeding duck state image recognition method and system based on video monitoring, and relates to the technical field of breeding duck image recognition, and the method comprises the following steps: obtaining continuous multi-frame breeding duck images based on a monitoring camera; gray level image processing is carried out on the breed duck image to obtain a breed duck gray level image, binarization processing is carried out on the breed duck gray level image to obtain a breed duck binarization image, and a breed duck contour is obtained based on the breed duck binarization image; acquiring a two-foot fluctuation difference value of the breeding duck based on the consecutive multi-frame contour of the breeding duck; a normal fluctuation threshold value is obtained based on the fluctuation difference value of the two feet when the breeding duck walks normally; judging whether the breed ducks are limping or not based on the two-foot fluctuation difference value of the breed ducks and a normal fluctuation threshold value; the method is used for solving the problems of inaccurate breed duck crippling identification and low identification efficiency caused by artificial breed duck identification in the existing breed duck crippling identification technology.

The invention belongs to the technical field of image processing, and discloses an image-based engine blade defect automatic detection method, which comprises the following steps: step (1), photographing a blade clamped by a robot clamping jaw through a two-dimensional camera to obtain a plurality of two-dimensional images covering the surface of the blade; (2) performing defect detection on the plurality of two-dimensional images by using a target detection neural network model; (3) for the detected two-dimensional image of the defect, calculating a three-dimensional coordinate of a defect center in a robot base coordinate system, and then enabling a clamping jaw to move the defect center to an imaging center of a three-dimensional camera; step (4), collecting a gray level image and point cloud data of the defect through a three-dimensional camera; and (5) processing the gray level image and the point cloud data of the defect by adopting a defect quantification method based on fusion of a three-dimensional camera and a neural network to obtain geometric information of the defect.

The invention discloses a mold quality detection method and system based on image processing, and relates to the technical field of mold quality detection.The method comprises the steps that a high-precision industrial camera is installed over a mold to obtain a mold surface gray level image, and graying and smoothing are conducted on the obtained image; constructing a distribution model according to the reference distance distribution condition of each pixel point in the smoothed image, calculating a period strength degree, preliminarily screening the pixel points according to the period strength degree, and distinguishing the possibility of texture pixel points and non-texture pixel points; by using the difference between normal texture periodicity and crack randomness, through calculating the periodicity intensity degree, screening texture pixel points and non-texture pixel points, screening suspected texture pixel points, calculating the periodicity similarity, screening out a texture region and then carrying out iterative threshold segmentation, the detection problem caused by mixing of cracks and normal textures is solved; and the detection accuracy is improved.

The invention provides a bridge crack detection method and system based on a YOLO algorithm, and a storage medium, and relates to the technical field of bridge crack detection, and the method specifically comprises the steps: S1, collecting an image of a bridge crack region, converting the image into a gray image, carrying out the detection through employing the YOLO algorithm, dividing a crack into corresponding grid units, and carrying out the detection through employing the YOLO algorithm; drawing a crack bounding box and storing an image of the bounding box; s2, determining four boundaries of the bounding box according to the center coordinate, width and height of the bounding box, and determining the position relationship between the crack and the bounding box; s3, determining the number and size of the cracks according to the position relation, and drawing a new crack bounding box; s4, calculating the total density and the total area of the grid unit cracks, and obtaining the comprehensive coefficient of the cracks; and S5, comparing the comprehensive coefficient with a preset threshold value, and judging the severity of the crack. According to the method, refined crack area detection is realized, and the crack detection precision and adaptability are also remarkably improved.

The invention relates to the field of bar quality detection, in particular to a special-shaped bar surface quality detection method, which comprises the following steps: acquiring multi-angle gray level images of a special-shaped bar, acquiring a light intensity matrix of each gray level image, calculating division characteristics, and presetting a threshold value to identify a suspected abnormal image; carrying out image superposition on the suspected abnormal images at different angles, obtaining superposition indexes, carrying out sorting, and when no new continuous pixel points appear or the prominence degree of new pixel points and neighborhood pixel points is smaller than a preset threshold value, stopping superposition, and obtaining an edge display image; and the difference between the edge display image and the standard image is obtained, the ratio of the number of non-zero points to the number of all pixel points serves as surface quality evaluation, and the quality of the special-shaped bar is evaluated and judged. According to the method, the image superposition process is controlled through the superposition index and the superposition stopping condition, it is ensured that important features are enhanced, unnecessary features are restrained, and abnormal features are effectively highlighted.

The utility model discloses a track inspection system and an inspection vehicle. The system comprises an image acquisition unit, a positioning synchronization unit, a switch and an image processing unit. The image acquisition unit, the switch and the image processing unit are sequentially connected, and the positioning synchronization unit is respectively connected with the image acquisition unit and the switch. And the positioning synchronization unit sends a trigger signal to the image acquisition unit to trigger the image acquisition unit to obtain 3D track data. And the positioning synchronization unit sends the mileage position data at the triggering moment to the image processing unit through the switch. 3D track data acquired by the image acquisition unit is transmitted to the image processing unit through the switch. According to the invention, the technical problem of high rail surface damage false detection rate due to the fact that the inspection system only adopts the rail two-dimensional gray level image to inspect the rail state can be solved.

The invention discloses a motor current fault diagnosis method based on a de-noising diffusion probability model, and belongs to the technical field of mechanical equipment state monitoring and fault diagnosis, and the method comprises the steps: obtaining an original motor current signal sample, carrying out the wavelet transformation, obtaining a time-frequency grayscale image, and obtaining a time-frequency grayscale image; dividing the sample into a training sample used for diffusion model training and a test sample of a fault diagnosis model; constructing a diffusion model DDPM, carrying out training by adopting the training sample, and generating a pseudo sample based on the trained diffusion model; constructing a fault diagnosis model MAF-Cnet, and training the MAF-Cnet based on the training sample and the pseudo sample to obtain the trained MAF-Cnet; and inputting a test sample into the trained MAF-Cnet for diagnosis to obtain a motor current fault diagnosis result. The method solves the core problem that the generalization ability of the diagnosis model is insufficient due to scarcity of motor fault samples, improves the diagnosis accuracy, and is wider in application scene.

The invention relates to the technical field of video recognition and analysis, and discloses a video recognition and analysis method based on physical characteristics. Video frame pixels are mapped to a two-dimensional coordinate system with the upper left corner as an original point, and mirror image expansion and median filtering are carried out on a gray level image; constructing a binary image based on a gray threshold value, and analyzing and extracting a target region by using a four-neighborhood connected domain; using neighborhood search and polar angle sorting to close the tracking contour, and generating equidistant re-sampling points based on Euclidean distance and an interpolation method; the curvature of the re-sampling points is estimated through a three-point difference algorithm, and zero denominator is avoided through numerical protection; performing discrete Fourier transform on the curvature sequence to extract a frequency spectrum, and normalizing an amplitude to form a standardized feature vector; and finally, inter-frame similarity is calculated based on the feature vector, and the most similar frame is automatically retrieved. By processing unified data standards in stages, edge noise is suppressed, sampling uniformity is ensured, and feature stability and cross-frame comparability are improved.

The invention provides a ship propulsion motor fault diagnosis method and device and a readable storage medium, the ship propulsion motor adopts a permanent magnet synchronous motor, and the method comprises the steps of collecting normal operation data of the permanent magnet synchronous motor under different working conditions and abnormal data of turn-to-turn short circuit and excitation loss faults; overlapping and sampling the collected three-phase current signals to form a fixed-length sample, and converting the three-phase current signals of the sample into phase comparison current points in a gray image state to form a sample data set; a ship propulsion motor fault diagnosis neural network model is built, the model comprises an input layer, a feature extraction layer, a full connection layer and an output layer, an improved residual network module is arranged in the feature extraction layer, a channel attention mechanism and a pre-activation residual module are fused, and the feature learning ability of key fault features of the ship propulsion motor is enhanced; and based on the trained ship propulsion motor fault diagnosis neural network model, performing early turn-to-turn short circuit and excitation loss fault diagnosis of the permanent magnet synchronous motor.

The invention relates to a method for detecting broken strips of a feeding strip of a drawing frame based on visual identification, which comprises the following steps of: acquiring image data containing the feeding strip under various conditions, and obtaining a final feeding strip learning initial identification model based on the image data; feeding strip motion frames are collected and converted into gray images, and the number and positions of feeding strips are obtained; judging whether the obtained number and position of the feeding strips are consistent with the set number and position of the feeding strips or not, and if yes, preprocessing subsequent continuous frames to obtain a gray identification threshold value; obtaining a difference image of the current frame image and the previous preset number of frame images, and determining a current strip feeding state according to the difference image; and according to the gray level identification threshold value and the difference image, identifying the current feeding strip and confirming the motion state of the feeding strip, and according to the motion state of the feeding strip, processing according to a preset rule. According to the invention, an interval section detection means is adopted, so that the staggering of adjacent feeding strips in movement can be detected, movement is contained, and more stable and reliable operation is provided.

The invention relates to the technical field of concrete strength detection, in particular to a concrete strength detection method and device for construction, and the method comprises the following steps: collecting surface humidity information, rebound strength, core drilling strength and concrete surface gray level images of each concrete test piece; obtaining the rebound drill core strength difference of each concrete test piece; acquiring a humidity influence strength coefficient; obtaining the average distribution density of pits of the concrete surface gray level image of each concrete test piece; obtaining a pit distribution uniformity coefficient of each concrete test piece; the surface roughness of the concrete is obtained; obtaining concrete strength influence coefficients of all the concrete test pieces; and improving a distance formula of a clustering algorithm based on the concrete strength influence coefficient and the humidity influence strength coefficient, and correcting the rebound strength of all the concrete test pieces. The detection precision of the concrete strength is improved.

The invention relates to the technical field of image processing, in particular to a magnesium ore granularity detection method and system based on image processing. The method comprises the steps that a magnesium ore image is collected and preprocessed to obtain a magnesium ore gray level image; processing the magnesium ore grayscale image by using a watershed algorithm to obtain a segmented image; constructing a two-dimensional directional Gaussian kernel for each cleavage direction, and performing convolution on the segmented image by using the two-dimensional directional Gaussian kernel; performing straight line detection on the segmented image after convolution to obtain a crack candidate line; when the crack candidate line and the segmentation line are associated in position, whether the two segmentation regions adjacent to the segmentation line are to-be-merged regions is evaluated according to gray feature values of the two segmentation regions; calculating the gray difference of the boundary of each to-be-merged region, and merging the two segmented regions when the gray is consistent; and calculating granularity data of the magnesium ore based on the merged segmented images. According to the method, the over-segmentation problem generated when the watershed algorithm is used for processing the magnesium ore image containing the cracks is solved.

The invention discloses a nondestructive testing method for an internal pore structure of foam light soil, which is characterized by comprising the following steps of: 1, taking a cube foam light soil test piece with the side length of 40mm, placing the maintained test piece on a sample table, scanning around the test piece for a circle by using an X-CT (X-ray computed tomography) scanner, enabling X-rays to penetrate through different layers of the test piece, the detector receives attenuated information of different layers, the information is converted through software and then input into a computer for reconstruction, and a gray level image is obtained; and 2, Image-ProPlus analysis software is adopted to process the gray level image, a threshold value of the gray level image is automatically identified, a WatershedSplit algorithm of the Image-ProPlus analysis software is utilized to segment the automatically identified gray level image again, and then binarization processing is carried out on the segmented image. The method can realize nondestructive testing of the internal porosity, pore size distribution, pore shape factor and average pore size of the foam light soil, and is simple and convenient to operate, accurate in data, visual in result and high in practicability.

The invention discloses a welding quality on-line detection method based on a laser welding machine, and relates to the technical field of welding process quality detection.The welding quality on-line detection method comprises the steps that a welding seam image in the welding process of the laser welding machine is collected, the welding seam image is converted into a gray level image, and binarization processing is conducted on the gray level image; performing morphological processing on the binarized image, eliminating noisy points in the image through opening operation and closing operation, and extracting edge contour features of the weld seam; detecting a straight line segment in the weld edge contour features, and calculating geometric parameters of the straight line segment; and analyzing the geometric parameters by adopting a quality scoring model to generate a weld quality score value. Through improved image processing, an efficient and accurate solution is provided for weld joint quality evaluation in the laser welding process, the accuracy of weld joint quality detection is improved, the real-time performance and the intelligent level of the evaluation process are optimized, and the method has wide application prospects.

The invention discloses a two-stage cascaded distributed optical fiber sound wave sensing vehicle trajectory reconstruction method and system, belongs to the technical field of intelligent traffic perception, and aims to solve the problem that geometric accuracy and topological integrity are difficult to consider under the conditions of low signal-to-noise ratio and complex road conditions in the conventional DAS vehicle trajectory reconstruction technology. The method comprises the following steps: in the first stage, carrying out nonlinear enhancement on original vibration data and converting the original vibration data into a two-dimensional space-time grayscale image, inputting the two-dimensional space-time grayscale image into a deep learning semantic segmentation network to generate a high-fidelity track mask, extracting a skeleton through morphological processing, and constructing an initial candidate topological graph; and in the second stage, multi-hop neighborhood kinematics constraint pruning is performed on the initial topological graph, false connection edges are eliminated, global optimization matching is performed by using a coupling cost function to repair fractures, then isolated points are recalled through local geometric scores, and finally a vehicle trajectory graph with complete topology is output. According to the method, geometric accuracy and topological integrity can be effectively considered in complex scenes such as speed change, lane change and multi-vehicle intersection, and the robustness of all-weather traffic flow monitoring is improved.

The invention relates to the technical field of composite material production and detection, in particular to a broken filament detection method, device and equipment for the end face of a carbon fiber spool, and the method comprises the steps: carrying out the image collection of the end face of the spool, and carrying out the graying processing of the collected image, and obtaining a gray image; carrying out image enhancement on the grayscale image, screening pixel points of the end face of a spool in the enhanced image through a grayscale condition, and obtaining a plurality of region sets by segmenting a connected domain; selecting an area with the largest area in the plurality of area sets, and removing pixel points belonging to the yarn drum to obtain a plurality of sub-areas; and screening the areas of the plurality of sub-regions, and if the area of the sub-region is greater than a set threshold value, judging that broken filaments exist. According to the invention, high-efficiency and accurate detection of broken filaments on the end face of the carbon fiber spool can be realized, and the quality and performance of carbon fibers in the subsequent processing process are ensured.

The invention relates to the field of melt state monitoring, in particular to an injection molding machine nozzle melt state monitoring method based on machine vision, and the method comprises the steps: obtaining an original image of melt at an injection molding machine nozzle, carrying out the preprocessing of the original image, obtaining a gray image and a melt region, and calculating the contour complexity representing the melt form based on the melt region; mapping the melt glue area to the gray level image, and calculating the energy and entropy value of the melt glue area; based on the gray level images of the current frame and the previous frame, the flow velocity fluctuation coefficient of the melt glue area is calculated, and the flow velocity fluctuation coefficient is in positive correlation with the fluctuation of the flow velocity die length of the pixel points; and constructing a feature vector by using the contour complexity, the energy, the entropy value and the flow velocity fluctuation coefficient, and inputting the feature vector into a preset prediction model to obtain a prediction result of the melt state. According to the invention, various types of defects such as caking, bubbles and flow marks can be monitored.

The invention provides a tilting-pad sliding bearing fault on-line monitoring method and device, and the method comprises the steps: collecting XYZ three-channel acoustic emission signals in normal operation and different fault states of a tilting-pad sliding bearing; and carrying out multivariate empirical mode decomposition on the acquired acoustic emission signals of the three channels so as to carry out noise reduction decomposition. And then, screening the decomposed intrinsic mode function through a kurtosis factor, converting the data of the three channels into gray level images, and fusing the gray level images into an RGB (Red, Green and Blue) picture. Thirdly, fault features are extracted through a convolutional neural network, and the features are input into a long-short memory neural network model for feature learning and training; acoustic emission signals under different working conditions are collected, and model parameters are finely adjusted through federal learning. And packaging the fault diagnosis model, finally compiling and generating an online identification system, automatically reading data at set intervals, and automatically identifying in a compiled interface. According to the invention, the problem of difficult on-line monitoring of the fault of the tilting-pad sliding bearing is effectively solved.

The embodiment of the invention provides a thermosensitive gray scale printing method and device, a storage medium and electronic equipment, and is applied to a thermosensitive printer, the method comprises the steps that to-be-printed Mth row of gray scale data is received, the Mth row of gray scale data is the Mth row of data in a K-order gray scale image, M is a positive integer larger than or equal to 1, and K is a positive integer larger than or equal to 2; the M-th line of gray scale data and first reference information are stored in a first memory, and the first reference information comprises the number of points to be heated of each level of gray scale data in the M-th line of gray scale data, a starting byte of each level of gray scale data in the M-th line of gray scale data and an ending byte of each level of gray scale data in the M-th line of gray scale data; and based on the first reference information, sequentially extracting gray scale data of each scale in the M-th line of gray scale data, and controlling the thermal printing head to execute thermal printing operation on the thermal medium according to the gray scale data of each scale in the M-th line of gray scale data until the M-th line of gray scale data is printed.

The invention relates to the field of image processing, in particular to a cable stranded wire quality detection method based on image features, and the method comprises the steps: obtaining a gray level image of a cable stranded wire image of continuous image frames, constructing a preset window, calculating the gray level feature quantity of pixel points, building a feature curve, segmenting the feature curve, and obtaining segmented curves; obtaining the rotation angle of the stranded wire according to the movement track of the pixel points in the segmented curve; according to the gray feature quantity, the segmented curve and the stranded wire rotation angle, the defect of the pixel points in the preset window is calculated; based on the defect degree of the pixel points in the defect obtaining window, the contrast ratio of the pixel points is adjusted according to the defect degree of the pixel points corresponding to all the image frames, threshold segmentation is conducted on the adjusted pixel points through the Otsu method, and the defect position of the cable stranded wire is obtained. According to the method, the defect pixel points on the stranded wire gaps and the iron wires in the image are enhanced, so that the defect detection accuracy is improved.

The invention relates to the image processing field, and especially relates to an airborne infrared image ship target segmentation method comprising the following steps: carrying out LBP characteristic value extraction to obtain an LBP characteristic image; obtaining a mode filtering smooth LBP feature image; performing adaptive threshold segmentation; filling a hole area; multiplying the image with the filled hole region by the airborne infrared gray level image pixel by pixel to obtain a region-of-interest image; obtaining an edge detection image; extracting all boundaries of the edge detection image to create a mask image; segmenting the interest region image by using an improved firefly algorithm to obtain a highlight target segmentation image; and multiplying the highlight target segmentation image and the mask image pixel by pixel to obtain a ship target segmentation result image. The ship texture difference is accurately captured through the LBP features, the improved firefly optimization algorithm is combined, different sea conditions and noise interference can be dealt with, the error segmentation rate is reduced, multi-threshold solution is combined, and the segmentation requirements of complex images can be met.