156results about How to "The method is efficient" patented technology

Provided is an SPEN (spatiotemporally-encoded) single-scanning magnetic resonance imaging spiral sampling and reconstructing method, relating to a magnetic resonance imaging method. 90 DEG linear scanning pulses and 180 DEG linear scanning pulses combine with corresponding SPEN gradients, and in a trigger period, protons in a space spin to obtain a quadratic phase relevant with a spatial position; in a sampling period, a spiral sampling gradient after optimization collets data, and obtains spatial domain magnetic resonance imaging data with T2*weighting in a superfast speed; and finally, spiral sampling data are reconstructed through a specific grid algorithm and a super-resolution reconstructing method based on compression perception, so as to obtain super-resolution high quality magnetic resonance images. The method greatly improves the image quality of SPEN single-scanning imaging, and provides a great imaging tool for the fields requiring superfast imaging.

The invention belongs to the synthetic chemistry field, in particular to a synthesis process for ruthenium mixed-pyridine complex and derivative. Mixed-pyridine in ruthenium mixed-pyridine complex has two structures of (I) and (II), and the process comprises reacting ruthenium material and combined mixed-pyridine complex with various substituent position, complex kind (two teeth or three teeth, namely bipyridyl or terpyridyl material) and substituent property, and salt or water such as NCS, F, C1, Br, I and CN in a sealed reaction device which can be heated up and pressurized in one step or several steps for 0.5-48 hours under the temperature of 50-300 DEG C, thereby obtaining target product. The invention provides a high pressure synthesis process, which does not need a condensing reflux device, continuous inactive gas supply and inert atmosphere protection and has simple process. The process can increase reaction temperature over the boiling temperature of reaction solution in necessary, namely the boiling temperature relative to constant pressure, and has high reaction speed rate.

The invention relates to a laser image linear feature extraction method. On the basis of a split-and-merge method, the efficiency of the method is improved through adaptive neighbor point set detection, line segment cutting is carried out with the use of a split-and-merge fuzzy method to improve the sensitivity of the method to parameters, and finally, a least square method is adopted to fit parameters under a polar coordinate system of each line segment in an environment. The method comprises the four major steps of neighbor point set detection, line segment cutting, least square linear fitting and linear fitting error calculation. The method implementation result shows that: when a line segment contains a large number of points, the result is accurate, the vast majority of line error is very small, the polar radius error is less than 1mm, the angle error is less than 0.01rad, and the fitting effect is good. Compared with a traditional straight line extraction method, the linear feature extraction method based on the laser sensor has the following advantages: (1) the number of iteration times of the method is reduced and the efficiency of the method is improved; (2) the robustness of the method is greatly improved; and (3) the line segment extraction precision is improved.

The invention discloses a method for measuring spherical object geometric parameters by use of lasers and a monocular camera. The method comprises the following steps: arranging the camera and the more than three lasers, enabling laser beams emitted by the lasers to irradiate on an object, wherein the laser beams are not coplanar and the orientation of the camera is the same as the directions of the lasers; defining a world coordinate system Ow and a camera coordinate system Oc, and determining an internal parameter matrix of the camera and a conversion relation between the camera coordinate system and the world coordinate system; defining an image two-dimensional coordinate system, enabling the camera to acquire points formed when the laser beams are irradiated on the object, and obtaining coordinates of the laser points under an the image coordinate system and circle center coordinates of the object on an image; and calculating geometric parameters of the object through a geometric relation and a camera-image conversion relation. Compared to a conventional monocular measurement method, the method provided by the invention has the following advantages: object information does not have to be obtained in advance, and the method is applied to measurement of non-texture non-cooperative object. Compared to a conventional binocular measurement method, the method provided by the invention has the advantages of higher efficiency and stability and better fault tolerance and robustness.

The invention discloses an image distortion correction method based on single sweep quadrature space-time coding magnetic resonance imaging. The method comprises steps of enabling protons to spin in the space to obtain a secondary phase related to the space position in the triggering stage by combining 90-degree and 180-degree linear sweep frequency pulse (chirp pulses) with an orthogonally distributed space encoding gradient, in a sampling stage, performing data sampling through positive and negative gradient echo train lengths which switch quickly to quickly obtain T2-weighted spatial domain magnetic resonance imaging data, performing reconstruction and correction on the distorted magnetic resonance images through a reconstruction algorithm of high resolution and an image distortion correction method so as to obtain a quality magnetic resonance image with high resolution. The image distortion correction method based on quadrature space-time coding magnetic resonance imaging provided by the invention can not only perform distortion correction according to own data without extra reference scanning, but also have capabilities of resisting a non-uniform field and operating normally in a strong non-uniform field.

The invention discloses a method for dynamic modeling for sea ice in a navigation simulator scene. The method for the dynamic modeling for the sea ice in the navigation simulator scene comprises the following steps of dynamically managing a whole sea ice field based on a quadtree space partition technology, confirming a state of a sea ice model and carrying out dynamic brash ice modeling on a single body ice breaking model. According to the method for the dynamic modeling for the sea ice in the navigation simulator scene, a quadtree technology is applied to the scene management of repetition models, due to the fact that the generation, breaking, melting and freezing in the sea ice model are extremely suitable for the storage of property structures, the whole sea ice face can be taken as a single layer, an octree which is more complex is not necessary to be used for managing three-dimensional scenes, the function of early stage simplification is performed on the subsequent breaking, freezing, melting and other dynamic processes, and thus the real-time performance of a visual system is greatly improved and optimized. According to the method for the dynamic modeling for the sea ice in the navigation simulator scene, a Voronoi image algorithm is optimized and then added and applied to sea ice dynamic modeling so that relative realistic situations meeting actual natural conditions can be formed in a breaking model when collision between ships and ice occurs, and thus the sense of reality of sea ice breaking is enhanced.

The invention relates to a method for individual cow identification, and relates to an image identification method in image data processing. The method comprises the following steps: collecting cow video data; converting the cow video data into an image sequence, and normalizing the image sequence; extracting four different component features of individual cows through wavelet transform; reducing the dimension of the four different component features through an improved KPCA method; carrying out weighting fusion on the four different component features; dividing image feature data into a training set and a test set; carrying out SVM training and SVM testing; and finally, identifying individual cows. The method overcomes the problem in the prior art that the intelligent identification method for individual cows still adopts a general image processing method instead of a suitable image processing method selected according to the individual characteristics of cows and especially the unique black-and-white patterns of cows, which results in low accuracy of individual cow identification.

The invention discloses an object-oriented three-dimensional scene view cone removing method, which comprises the following steps: firstly, analyzing a three-dimensional scene camera to obtain geometric information of a view cone; converting the scene content from a world coordinate system into a camera space coordinate system through rigid transformation; projecting the converted content and thecamera view cone to an X-Z plane of a camera coordinate system; constructing a model node object by combining bounding box information and lightweight attribute information to construct a quadtree structure; and then determining a visual area according to the geometric information of the view cone, finally judging the position relationship between the visual area and the model node object throughan odd-even ray method, and if the relationship is included or intersected, carrying out visual judgment on the Y dimension of the model through a camera aspect ratio. According to the object-orientedthree-dimensional scene view cone removing method, the effect of accelerated drawing of the three-dimensional scene and the model of the three-dimensional scene can be achieved, and the frame numberis increased, and the operand is reduced, and the time complexity is reduced.

The invention relates to a method for detecting total iron content of iron ore based on spectral data. The method comprises the following steps that spectral data of an iron ore sample to be detectedis acquired, and the spectral data comprises M spectral characteristics; the spectral data is inputted into an iron ore classification model to obtain the iron ore type of the iron ore sample to be detected; and according to the obtained iron ore type, the spectral data is inputted into an iron ore total iron content detection model of the corresponding iron ore type to obtain the iron ore total iron content corresponding to the spectral data. The method for detecting the total iron content of the iron ore based on spectral data has the advantages of high efficiency, low cost and high precision.

The invention discloses a geographic national condition monitoring result reliability quality inspection method and system. The method comprises the following steps: establishing a sample data set byutilizing existing orthoimage data T and mask data; performing enhancement processing on the sample data; on the basis, establishing a deep convolutional neural network model CNN; performing deep enhancement and fusion on the model; secondly, performing super-pixel segmentation on the new time-phase image T2 to obtain feature pattern spots; mapping the data to old time phase surface coverage datato obtain geometric information of the changed pattern spots; thirdly, inputting new time-phase image T2 data into the trained deep convolutional neural network model to obtain semantic information ofthe changed pattern spots; and finally, comparing the change information with the detected land surface coverage data to obtain a suspected missed and leaked area, and comparing the suspected missedand leaked area with the new and old time phase images T1 and T2 for verification to obtain a final land surface coverage change reliability quality inspection result. The method can achieve the quickinspection of the reliability of a remote sensing image change detection result, can be used for the quality inspection and acceptance of a geographic national condition monitoring project, and greatly improves the quality inspection efficiency.

The invention discloses a method for regulating and controlling an amorphous alloy microstructure. The method comprises any one or a combination of the following modes that (1), alloy melt heat treatment temperature in the preparation process of an amorphous alloy/ a nanocrystalline amorphous precursor alloy is adjusted; (2), alloy melt heat treatment time in the preparation process of the amorphous alloy/ the nanocrystalline amorphous precursor alloy is adjusted; (3), casting temperature of the alloy melt generated when the melt is cast to a cooling roller in the preparation process of the amorphous alloy/ the nanocrystalline amorphous precursor alloy is adjusted; (4), temperature of cooling water in the preparation process of the amorphous alloy/ the nanocrystalline amorphous precursor alloy is adjusted, and the cooling water is used for changing the cooling capacity of the cooling roller to the alloy melt; (5), the prepared strip thickness of the amorphous alloy/ the nanocrystallineamorphous precursor alloy is adjusted; and (6), the amorphous alloy/ the nanocrystalline amorphous precursor alloy in quenching state is subjected to low-temperature relaxation heat treatment. The method is high in efficiency, low in cost and high in controllability.

The invention discloses a method for measuring the geometric dimension of a refractory brick. The method includes the steps of carrying out filtering and noise reduction on an original refractory brick color image to obtain a noise-reduced image; seperating a refractory brick region from the noise-reduced image to obtain a refractory brick image; carrying out morphological processing on the refractory brick image, so that the edges of the refractory brick image are in smooth transition, and removing the isolated point noise at the edges of the refractory brick image to obtain a corrected refractory brick image; using a Canny operator for carrying out edge detection on the corrected refractory brick image; extracting the contour linear line of the refractory brick by using a Hough transformation method and a K-means method, and forming the outer contour of the refractory brick. The method for measuring the geometric dimension of a refractory brick improves efficiency and precision.

The invention discloses an efficient and steady multi-baseline UKF phase-unwrapping method. The efficient and steady multi-baseline UKF phase-unwrapping method comprises the following steps: firstly, obtaining long baseline interferometric phase gradient estimation information from a shorter baseline interferogram by utilizing a combined phase gradient estimation technology based on AMPM; defining an interferogram path guide figure, normalizing and quantizing the interferogram path guide figure into an integer guide phase unwrapping path; by combining a quantization path guide figure strategy, directly unwrapping long baseline interferogram along a path by utilizing the UKF phase-unwrapping method from an interferogram high-quality region to an interferogram low-quality area on the basis of obtaining long baseline interferometric phase gradient. According to the efficient and steady multi-baseline UKF phase-unwrapping method, not only can algorithm accuracy be improved, but also the algorithm efficiency can be greatly improved.

The invention belongs to the technical field of metal material preparation and casting formation, and relates to a method for refinement of a rare earth-rich phase of a rare earth-magnesium alloy. Rare earth in the rare earth-magnesium alloy comprises one, two or more of 0.5-4% of RE (which is mixture of Ce and La and comprises 50-70% by mass of Ce and the balance La), 0.5-2% of Y, 2-3% of Nd and 1-5% of Gd. The method comprises pouring a magnesium alloy liquid with the temperature 0-40 DEG C higher than that of a liquidus line into a slurry container pre-heated to a preset temperature, dropping an amplitude-change pole to a position 1-25mm lower than a metal liquid surface, simultaneously, starting ultrasonic vibration, carrying out ultrasonic vibration for 1-8min, then controlling a metal melt temperature 5-50 DEG C lower than a liquidus line temperature and carrying out molding on the metal melt subjected to ultrasonic vibration to obtain a magnesium alloy part. Crystal grain size and rare earth-rich phase size are greatly reduced than size of the microstructure before ultrasonic vibration. The method can be used for a rare earth-magnesium alloy pulping process, a follow-up rheocasting process and a rare earth-magnesium alloy part molding process.