6 results about "Otsu's method" patented technology

The invention discloses a tidal flat automatic extraction method fused with an irregular hexagonal grid. The method comprises the following steps: step 1, constructing a time sequence remote sensing data set; step 2, establishing a precision verification sample library; step 3, screening spectral indexes; 4, synthesizing an extreme tide level image; 5, generating an irregular hexagonal grid; step 6, carrying out adaptive threshold segmentation; step 7, secondary elimination of confused ground features; step 8, tidal flat range extraction and precision verification; according to the method, based on a time sequence remote sensing image set, pixels at all positions are screened through a specific spectral index maximum value, a new extreme tide level image is formed through combination, spatial heterogeneity of a complex coastal zone is adapted through an irregular hexagonal grid and a bottom-to-top hierarchical merging strategy, local self-adaptive threshold segmentation is achieved in cooperation with a local Otsu algorithm, and a new extreme tide level image is obtained. The optimal grid scale is automatically determined by means of an elbow method, and the confused ground features are secondarily eliminated through the time sequence standard deviation, so that the problem of miscarriage of the confused ground features is effectively solved, and high-precision full-automatic extraction of the tidal flat is realized.

The present application relates to high-speed railway subgrade construction quality detection technical field, disclose a kind of railway subgrade filler grading identification method and system based on airborne unmanned vision perception, comprising: through the image of filler field collected by airborne unmanned aerial vehicle, carry out gray conversion, size reduction etc. in turn pretreatment;Adopt Otsu's method to carry out self-adapting binaryzation, exert morphological open operation, erosion, the sequence operation of inflation, to accurately segment and optimize filler particle profile;Profile is extracted using Canny algorithm, with the long diagonal line of particle circumscribed rectangle as equivalent particle diameter;Introduce shape correction factor to correct the error of sphere volume hypothesis, calculate particle mass based on the preset filler density-particle size relationship model;Finally, statistical generation grading curve.The present application realizes the automatic, fast, non-contact identification of railway subgrade filler grading, improves detection efficiency and accuracy, and provides technical support for intelligent quality control of subgrade construction.

This invention relates to outdoor iris image processing technology, providing a real-time comprehensive quality assessment method and an adaptive optical parameter adjustment system. The assessment method includes: locating the eye boundary based on grayscale projection and local normalization; generating dual thresholds using an improved Otsu algorithm and dynamic grayscale subspace search; calculating a sharpness index based on second-order gradient entropy change; locating the pupil through a reliable edge point fitting mechanism, detecting the outer circle of the iris using an improved integral-differential operator, and evaluating segmentation accuracy using the ratio of the local standard deviation of the edge to the standard deviation of the target region; fusing gradient fitting and grayscale distribution to achieve eyelid and eyelash detection; and finally outputting a quality score based on 18 weighted indicators. The optical adjustment system senses the environment and initializes optical parameters, dynamically adjusting parameters based on weighted voting from multiple frames of images, and achieving rapid convergence with environmental consistency verification. This invention improves the speed and stability of pupil localization, sharpness assessment, eyelash detection, and illumination adjustment in low-computing-power scenarios.

The application discloses a mural virtual restoration method and device, computer equipment and a readable storage medium, relates to the mural disease detection and image processing technical field, is suitable for large-area mural with various diseases, improves the restoration efficiency, and can overcome small noise. The method comprises the following steps: in response to a mural restoration instruction, a hyperspectral imager is used to collect mural images, the mural images are corrected, and target hyperspectral reflectivity images are obtained; a principal component analysis algorithm and a high-pass filter enhancement algorithm are used to enhance the target hyperspectral reflectivity images, an image operation formula is used to operate the enhanced images, and preprocessed images are obtained; a non-disease area mask is made based on a remote sensing image processing platform, a multi-scale bottom-hat transform algorithm is used to extract the images after the mask, disease information is obtained, the disease information is segmented by using an Otsu algorithm, and a disease binary graph is obtained; a fast marching algorithm is used to restore the denoised disease binary graph, and target restoration images are obtained.

The Zn—Al—Mg-based hot-dip plated steel member includes: a steel member; and a hot-dip plating layer arranged on a surface of the steel member, wherein the hot-dip plating layer includes, as an average composition, in terms of mass %, 4 to 22% of Al, 1.0 to 10.0% of Mg, 0.0001 to 2% of Fe, and a balance including Zn and impurities; in binarized image data of image data obtained by imaging a surface of the hot-dip plating layer, the total area ratio of white pixels is 30% or more and 70% or less; and the binarized image data is obtained by binarizing the image data by Otsu's method.

This invention discloses a method for combating intermittent sampling interference based on Otsu's method for random orthogonal subpulses. The method includes: establishing intra-pulse and inter-pulse randomly coded orthogonal frequency modulated waveform models; encoding and orthogonally frequency modulating intra-pulse and inter-pulse subpulses to obtain compressed subpulses; obtaining the inter-class variance of the compressed subpulses according to a multi-level Otsu algorithm; obtaining an optimal threshold based on the inter-class variance of the compressed subpulses; and determining the difference between the target signal and three types of intermittent sampling interference signals based on the optimal threshold. This invention can improve the accuracy of identifying and distinguishing the target signal and the three types of intermittent sampling forwarding interference signals, effectively combating intermittent sampling forwarding interference.