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113results about How to "Avoid selection" patented technology

Voltage sag detection method for S-transformation on basis of time-frequency gathering characteristic criteria

The invention discloses a voltage sag detection method for S-transformation on the basis of time-frequency gathering characteristic criteria. The method includes the first step of obtaining voltage sag disturbance signals to be detected generated in a power distribution network, the second step of conducting analog-digital conversion on an obtained voltage sag disturbance signal model, the third step of conducting optimized selection on gaussian time-frequency window width adjustment parameters in an improved S-transformation method according to time-frequency gathering characteristic criteria, substituting the gaussian time-frequency window width adjustment parameters selected according to empirical values, and conducting characteristic extraction, detection and analysis on digital signals to be detected in the second step through the improved S-transformation. Selection of condition parameters of a gaussian window function is optimized through the constraint condition that the value of a time-frequency gathering characteristic expression is maximized when the signals are analyzed through the improved S-transformation, and the improved S-transformation is applied to characteristic extraction, detection and analysis on voltage sags. The voltage sag detection method for S-transformation on the basis of time-frequency gathering characteristic criteria has the higher detection accuracy degree and signal denoising capacity on transient-state electric energy quality signals.
Owner:JIANGSU UNIV

Method for precisely solving length of unstressed cable of cable-stayed bridge

The invention provides a method for precisely solving the length of an unstressed cable of a cable-stayed bridge. The length of the unstressed cable is solved by substituting the average value of the nodal force at the end of the stayed cable with a precise calculation method for the force at the end of the stayed cable, and by building a precise expression s0 of the length of the unstressed stayed cable and a characteristic parameter beta constraint equation of the stayed cable when a tensile force at the end of a tower is known without selecting the primary value of the length of the unstressed cable. The method comprises the following steps of: building the precise expression of the length of the unstressed stayed cable and the characteristic parameter beta constraint equation of the stayed cable when the tensile force Tj at the end of the tower is known, and solving the length of the unstressed stayed cable. The method has the advantages of solving the problem on the selection of the primary value of the length of the unstressed cable, with high convergence rate and small calculation error. Compared with the linear search, the dichotomy and the improved chord secant method for iteratively solving the length of the unstressed cable, the method of the invention greatly improves the solution precision and solution efficiency of the length of the unstressed stayed cable, so the method is of relatively high application value in practical projects.
Owner:WUHAN UNIV OF TECH

Gray level image colorizing method and device

The invention discloses a gray level image colorizing method, and belongs to the technical field of digital image processing. Directing at the problem that in an existing image colorizing method based on YUV joint correlation, colors of an edge region are mixed and distorted, the existing image colorizing method is improved. The gray level image colorizing method comprises the steps that firstly, the similarity degree of spatial position information and brightness information is considered comprehensively and used, and a plurality of extremely similar pixels are searched out from a larger window region with a pixel to be colorized as the center; secondarily, the post-normalization local brightness weighting coefficients of the extremely similar pixels are calculated; then a chromaticity-coefficient constraint matrix equation formed by chromaticity of all the pixels and the local brightness coefficients of all the pixels is solved to obtain the chromaticity of the pixel to be colorized; at last, an image is converted from a YUV space to a RGB space to obtained a colorized image. The invention further discloses a gray level image colorizing device using the method. The gray level image colorizing method and device can reduce color mixing and distortion of the edge region of the image, and improve the subjective and objective quality of the colorized image.
Owner:NANJING UNIV OF POSTS & TELECOMM

Deconvolution based radar angle super-resolution imaging method

ActiveCN104122549AAvoid selectionRealize radar angle super-resolution imagingRadio wave reradiation/reflectionImage resolutionRadar
The invention discloses a deconvolution based radar angle super-resolution imaging method. The deconvolution based radar angle super-resolution imaging method comprises converting the radar angle super-resolution imaging into a convolution inversion problem on a complex domain and adding constraints to change the intrinsic ill-condition of the convolution inversion problem; converting the convolution inversion problem into an implementation problem of an optimal solution of a constraint objective function on a corresponding complex domain; utilizing vectors on a real number domain to represent complex variables and converting the problem of the optimal solution of the constraint objective function on the complex domain into an implementation problem of an optimal solution of an unconstrained objective function on the real number domain; implementing the optimal solution of the unconstrained objective function on the real number domain by a Lagrange method of multipliers and implementing the radar angle scanning super-resolution imaging. According to the deconvolution based radar angle super-resolution imaging method, the limitation of antenna system parameters on the radar image resolution can be broken through, the radar angle super-resolution imaging is implemented, and the effects of the imaging result on the target range, number and position information maintaining are good.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Pointer instrument detection and reading identification method based on mobile robot

ActiveCN110807355AImprove detection accuracyImprove the detection accuracy of small-scale targetsImage enhancementImage analysisEngineeringContrast enhancement
The invention relates to a pointer instrument detection and reading identification method based on a mobile robot. The method comprises the following steps: obtaining a deep neural network detection model M for a pointer instrument; the mobile robot moves to a designated place to obtain an original environment image containing the instrument equipment at present in a mode that the mobile robot carries a camera; S serves as system input and is transmitted to a deep neural network model M, whether an instrument exists in S or not is detected, the position of the instrument is framed out, an image in a frame is intercepted and subjected to height setting processing, the length-width ratio is not changed, and the processing result is represented by J; contrast enhancement is performed on the image, and a processing result is represented by E; local adaptive threshold segmentation is performed on the E to obtain a reverse binary image B; pointer extraction processing is performed based on aprobability circle; a central straight line L of the pointer part is extracted as pointing information of the instrument pointer; and a coordinate system is established based on a probability circlecenter projection algorithm and reading by an angle method.
Owner:TIANJIN UNIV
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