781results about How to "Reduce mismatch" patented technology

The invention discloses a semi-supervised mechanical fault diagnosis method based on an adaptive migration neural network, and the method comprises the steps: firstly obtaining a plurality of source domain fault data sets composed of source domain fault training samples and corresponding tags, and a plurality of target domain fault data sets composed of target domain fault data without tags, wherein the target domain fault data is divided into a target domain fault training sample and target domain fault test data; normalizing the data; constructing an adaptive migration neural network diagnosis model, supervising the training model and constructing a classifier loss function by using the source domain fault data set, constructing a classifier discrimination loss function, and performing adversarial training on the feature extractor and the classifier by using the target domain fault training sample; inputting the target domain fault test data into the trained model, and summing and averaging the two output probability values to obtain a final classification diagnosis result. The method can improve the discrimination capability of the fault data of the target domain, and effectively improves the intelligent fault diagnosis task under the actual variable working condition.

A semipolar plane III-nitride semiconductor-based laser diode or light emitting diode, comprising a semipolar Indium containing multiple quantum wells for emitting light, having Aluminum containing quantum well barriers, wherein the Indium containing multiple quantum well and Aluminum containing barriers are grown in a semipolar orientation on a semipolar plane.

A segmented slope compensation circuit applicable to a BUCK converter belongs to the technical field of an electronic circuit. An oscillator circuit is used for introducing output voltage informationof the BUCK converter, a negative input end voltage of an operational amplifier is clamped to a positive input end voltage thereof, a first capacitor is charged by a current mirror, the negative inputend voltage, namely a slop voltage signal, of the operational amplifier is obtained, the slop voltage signal is compared with a second reference voltage to obtain a periodic slope voltage signal, a slope current generation circuit is used for generating compensation slopes with different slope rates under different duty ratios, a slope voltage correlated to the duty ratios is generated on a sampling resistor after passing through a slope summing circuit, and a base current compensation circuit is used for stabilizing a system. Compared with a traditional slope compensation circuit, the segmented slope compensation circuit has the advantages that the system stability is improved by employing different slope compensation rates under different duty ratios; and with the adoption of a triode as a buffer, the segmentation accuracy is improved.

The invention belongs to the field of machine vision and relates to a polar correction based sub-pixel level phase three-dimensional matching method. The polar correction based sub-pixel level phase three-dimensional matching method mainly aims at the problem of three-dimensional matching efficiency and accuracy in a three-dimensional measuring system through a binocular structure projection gate phase method. According to the polar correction based sub-pixel level phase three-dimensional matching method, a binocular three-dimensional visual geometric structure is calibrated into a head-up binocular standard geometric structure, phases formed by a matching point in a left camera and a right camera are in the same horizontal line, a dense phase value of a calibrated new phase graph is obtained through bilinear interpolation, a phase area based three-dimensional matching algorithm is provided, an initial matching point is obtained, similarities within a 3*3 area close to the initial matching point are fit into a quadric surface through least square method based surface fitting, a local minimum of the surface is obtained, and coordinates of a right camera matching point with the same phase as a to-be-matched point are obtained. The polar correction based sub-pixel level phase three-dimensional matching method can rapidly and accurately achieve dense three-dimensional matching and satisfies a requirement for industrial applications.

The invention provides a mobile robot V-SLAM method of a three-stage point cloud registration method. The V-SLAM method comprises the following steps: S1, acquiring RGB information and Depth information of the surrounding environment; 2, generate three-dimensional point cloud data; 3, extract that ORB image feature from the obtained RGB image, and match the feature of the point set elements by adopting FLANN; S4, screening the point pairs of the RGB map through the RANSAC sampling strategy so as to obtain the interior points to complete the preprocessing stage; S5, completing the initial registration stage of the point cloud by adopting the corresponding point double distance threshold method based on the rigid body transformation consistency; S6, a dynamic iterative angle factor ICP precision registration method is introduced to complete the precision registration phase when the initial posture is good; S7, the key frame selection mechanism of sliding window and random sampling is introduced in the back end, and the g2o algorithm is used to optimize the robot posture trajectory, so as to realize the reconstruction of three-dimensional point cloud environment The invention can improve the registration accuracy and registration efficiency of the point cloud map in the environmental three-dimensional reconstruction.

The invention provides a scene depth obtaining method based on an integration image technology. The method comprises the following steps of (1) obtaining an integration image, (2) extracting a view, (3) carrying out parallax analysis and depth calculation on the view, and (4) carrying out multi-base-line matching and calculation. The method is a depth obtaining method of passive visual inspection, does not need to use a special light source and can obtain depth information under natural light. Compared with traditional binocular machine visual equipment, the system is compact and small in structure, is convenient to image, and does not need to carry out calibration and correction among different cameras. The depth of field is larger than that of a traditional camera with the same camera aperture, and under the action of auxiliary adjustment of a main lens, a better imaging effect can be achieved for a far-field scene. A multi-base-line algorithm is adopted, and the reliability and stability for obtaining the depth information can be further improved.

The invention provides a multi-vision image dense coupling fusion method and system based on multiple characteristics and multiple constraints. The method comprises the following steps: according to the multiple constraints, respectively selecting a plurality of images to be coupled for each reference image, obtaining to-be-coupled image sets, and the reference images and corresponding coupling image sets form coupling models; for each coupling model, by use of multi-vision constraint conditions, carrying out half global dense coupling to directly generate a dense coupling result of a single coupling model, and obtaining a corresponding elevation graph; according to elevation smooth constraints between grid points, under the condition of a minimum global energy function, carrying out fusion on the dense coupling results of the multiple coupling models; and through combination with surface characteristics and line characteristics, carrying out point cloud optimization to generate final point clouds. According to the technical scheme provided by the invention, a reasonable stereo image pair can be automatically selected, coupling results are enabled to be more accurate and reliable by use of multi-vision information, optimal multi-vision fusion results with global significance can be obtained, and the point clouds generated through the optimization are finer.

The invention provides a sub-pixel level stereo matching method based on a scale space. The method comprises the following steps of: (1) establishing the scale space for a stereopair; (2) determining the size of a matching window for each point of a current level reference image in the scale space; (3) calculating a parallax searching range for each point of the level reference image according tothe parallax of the former level; (4) calculating an integer-grade parallax of the current level in the scale space; and (5) calculating a sub-pixel level parallax through a sub-pixel level matching method based on binary search. The method of the invention uses the stereopair generated under the condition of small height ratio to match; a dispersed scale space is used in the matching process to improve the matching efficiency; a bonding phenomenon generated in the matching process is reduced by using a mixed window selecting strategy; and the sub-pixel level parallax is obtained by the sub-pixel level matching method based on the binary search so as to ensure high sub-pixel level precision, and greatly improve matching efficiency of the algorithm.

The invention discloses a composite coating of diamond / W-C gradient structure, and a preparation method thereof. The composite coating is characterized in that a composite coating which takes a W-C gradient structure as a transition layer and takes a diamond coating as a wearable coating is formed on a WC-Co hard alloy; the preparation method comprises the steps as follows: the hard alloy is used as a sample; a surface layer WC is dipped in Murakami reagent so as to form a Co-rich layer; subsequently, pure tungsten is taken as target material and argon and carbonaceous gas are used as reaction gases to prepare the W-C gradient structure of different structures as the transition layer by a reaction sputtering method by adjusting the concentration of carbonaceous active gas in the reaction gas, thus preparing the diamond wearable coating by a chemical vapor deposition technique. The composite coating solves the problem of the bonding strength of the film / substrate and ensures the surface smoothness of the diamond film.