6 results about "Point set registration" patented technology

The application discloses a sub-pixel precision robust PIN needle position accuracy detection method and device and a storage medium. The method comprises the following steps: acquiring an image of a PIN needle of a product to be detected, wherein the image can present contour information of a needle body / needle tip; positioning a PIN needle region to obtain a region of interest of each PIN needle; performing sub-pixel segmentation on the PIN needle in the region of interest of each PIN needle to obtain a sub-pixel level precision needle body / needle tip segmentation result; obtaining needle body / needle tip center coordinates according to the result; if the number of obtained needle body / needle tip centers is not equal to the number of template centers, the product is determined as an unqualified product; if the number is the same, a coordinate system O is established according to the obtained needle body / needle tip center coordinates; point set registration is performed on the coordinate system O and a template center coordinate system, and whether the position accuracy meets the detection requirement is determined according to a point set registration result. Compared with an existing position accuracy detection method, the sub-pixel segmentation can guarantee high segmentation precision and reduce the hardware cost of a high-precision imaging scheme.

The invention discloses a circuit board marking and positioning method and system for general material identification and point set registration, and the method comprises the steps: obtaining a teaching image of a teaching circuit board, calling a general material identification model to carry out the identification of the teaching image, and obtaining a teaching material point set; receiving a specified marking point in the teaching image, and recording a relative displacement relationship of the marking point relative to the associated material point; obtaining a to-be-marked image of a to-be-marked circuit board, and calling the general material recognition model to recognize the to-be-marked image to obtain a to-be-marked material point set; point set registration is carried out on the teaching material point set and the to-be-marked material point set, and transformation parameters from a teaching image coordinate system to a to-be-marked image coordinate system are obtained; mapping the associated material points to a to-be-marked image coordinate system based on the transformation parameters, and determining marking point pixel coordinates of the to-be-marked circuit board according to the relative displacement relationship; and converting the marking point pixel coordinates into marking point coordinates under a marking equipment coordinate system. The invention aims to improve the stability of marking positioning.

The invention provides a multi-stage skyline positioning method, which belongs to the technical field of navigation, and specifically comprises the following steps: acquiring panorama image data of a mountain range image in a mountainous area, generating a mountainous area landscape image, and extracting a skyline corresponding to the mountainous area landscape image; extracting a local aggregation descriptor feature, an SVD feature and a height frequency vector from the landscape image, splicing the features into a unified retrieval vector, screening an initial skyline set by taking an Euclidean distance as a measure, and taking a first number of skylines ranked from small to large as a candidate skyline set; using a ResNet network to extract depth features and calculate Euclidean distances between the depth features and the candidate skyline set, and selecting a second number of skylines before the Euclidean distances are ranked from small to large as a target skyline set; and point set registration is carried out, final sorting is carried out according to the registered Euclidean distance, and the position information corresponding to the sample with the minimum distance is selected as the positioning result of the mountain landscape image. Through the scheme of the invention, the positioning accuracy and adaptability are improved.

The application discloses a bimodal developing navigation marker system, which comprises a marker body, a visible characteristic module, a positioning and registration module, a fusion display module and a deformation compensation module. The marker is made of metal titanium and coated with a polymer coating containing micro-bubbles, and can be developed in CT and ultrasonic images simultaneously. The system realizes automatic alignment of the CT model and the B ultrasonic image through a point set registration algorithm, and realizes real-time prediction of the non-rigid deformation of soft tissue by using an optical flow algorithm and correction of the position of the three-dimensional model, so that intraoperative dynamic navigation and accurate puncture are realized. The system has the advantages of strong bimodal visibility, fast registration speed, high puncture precision and real-time respiratory compensation, and is suitable for kidney puncture, biopsy and interventional therapy navigation.

The present invention relates to a method encompassing acquiring data as to the geometric structure / topology of a predefined surface section as well as to an additional physical property assigned to the surface section, determining variability of the geometric structure / topology as well as of the additional physical property over the surface section, and determining from these at variabilities an expected stability of co-registering datasets describing the predefined surface section. The present invention further relates to a corresponding computer program and a corresponding system for carrying out this method.

The invention discloses a printed circuit board automatic optical detection method and system based on edge computing power, and the method comprises the steps: obtaining circuit board design data and / or a standard template image of a target product, and constructing a standard template point set containing a material center point coordinate and a material category mark; collecting an image of the circuit board to be detected; performing weighted point set registration on the set; according to the target space position and the position, the size and the orientation of the corresponding detection frame, the offset, the rotation deviation and the scale change of the material position number on the current circuit board and the overlapping degree index between the current circuit board and the template detection frame are calculated; and comparing the detection index of each material position number on the current circuit board with the corresponding dynamic judgment threshold to obtain a qualification or disqualification judgment result of the circuit board to be detected and each material position number. According to the technical scheme, the manual parameter adjustment frequency is reduced in the multi-variety and working condition drifting production environment, and the reliability and consistency of defect judgment are stabilized.