10 results about "Reconstruction filter" patented technology

Systems and methods for waveform repair. The methods comprise: receiving a signal of interest having a spectral distortion, the signal of interest having a sequence of symbols; generating an estimate for each symbol of a sequence of symbols in the signal of interest; and applying reconstruction filtering to the estimates to correct the spectral distortion.

A medical image processing apparatus according to an embodiment includes processing circuitry. The processing circuitry acquires a plurality of projection data based on an output signal from an X-ray detector that rotates around a subject, performs reconstruction filter processing on the plurality of acquired projection data, the reconstruction filter processing being included in reconstruction regarding the plurality of projection data, generates correction information on a sensitivity difference area formed in the plurality of projection data due to differences in sensitivity of the X-ray detector, on the basis of a processing result of the reconstruction filter processing, performs correction processing on the plurality of projection data on the basis of the correction information, and performs reconstruction processing including the reconstruction filter processing on the plurality of projection data subjected to the correction processing.

The reservoir transformation filtering device comprises a long cylinder, a groove is formed in the inner wall of the long cylinder, a first filter screen is arranged in the groove, the first filter screen is connected with the groove through a spring, and the first filter screen is made of an elastic material; a sleeve is arranged in the long cylinder, the side wall of the sleeve is connected with the inner wall of the long cylinder through a transverse shaft, a rotating shaft is rotationally connected in the sleeve, one end of the rotating shaft penetrates through the sleeve and is fixedly connected with fan blades, and the other end of the rotating shaft is fixedly connected with a rotating rod; the first filter screen is fixedly connected with an auxiliary magnetic block, the surface of the rotating rod is fixedly connected with a main magnetic block, and the sides, adjacent to the main magnetic block, of the auxiliary magnetic block are homopolar, so that the technical problem that in the fracturing transformation process, impurities exist when liquid is injected and passes through the long cylinder, so that the pump injection liquid supply efficiency becomes low, and the reservoir fracturing transformation effect is affected is solved. According to the reservoir transformation filtering method disclosed by the invention, under the pressure of water flow, the first filter screen, the main shaft and the auxiliary shaft are driven to move, limiting on the rotating shaft is relieved, and the fan blades are driven to rotate, so that the fan blades drive the shifting rod to scrape sand and stone particles on the surface of the first filter screen.

A first flag in a frame header of a current frame indicates whether a post-reconstruction filtering process is performed for the current frame. When the process is performed, a second flag indicates whether a post-reconstruction filtering syntax for the post-reconstruction filtering process of a previously decoded frame is reused for the current frame. The post-reconstruction filtering syntax can be a frame-level syntax or a block-level syntax. When the second flag indicates that frame-level post-reconstruction filtering syntax of the previously decoded frame is reused for the current frame, a third flag may indicate whether the block-level post-reconstruction filtering syntax of a previously decoded frame is reused for the current frame. The post-reconstruction filtering syntax, whether the frame-level, the block-level, or both, is used for the post-reconstruction filtering process unless new syntax is coded for the current frame.

To reduce artifacts caused by differences in the sensitivity of X-ray detectors. [Solution] The medical image processing apparatus according to this embodiment includes: an acquisition unit that acquires a plurality of projection data corresponding to a plurality of rotation angles based on output signals from a plurality of X-ray detection elements in an X-ray detector that rotates around a rotation axis around a subject; a filter averaging unit that applies a reconstruction filter to each of the plurality of projection data and generates a first averaged image by averaging the plurality of projection data to which the reconstruction filter has been applied; a region setting unit that sets regions in the plurality of X-ray detection elements in which the X-ray sensitivity is relatively high based on the first averaged image; a correction unit that performs a correction process for the difference in sensitivity inside and outside the region in each of the plurality of projection data multiple times with different correction amounts; and a reconstruction unit that performs a reconstruction process accompanied by the execution of the reconstruction filter based on the corrected plurality of projection data.

Method and device for delaying a signal. Method for delaying a signal, characterized in that it comprises: - obtaining a signal to be delayed by τ fra , said signal comprising an input point and an output point; - constructing a reconstruction filter of the delay τ fra based on a window function, - outputting the signal of the input point delayed at the output point.

Provided is a video decoding method including: obtaining constrained prediction information indicating whether a constrained intra prediction mode is enabled; generating reconstructed samples of a current block by using prediction samples of the current block and residual samples of the current block; when the constrained intra prediction mode is enabled by the constrained prediction information and a prediction mode of a neighboring block is not an intra prediction mode, determining a padding value corresponding to a neighboring sample adjacent to outside of a boundary between the current block and the neighboring block, by using the reconstructed samples of the current block; and performing post-reconstruction filtering on the current block, by using the padding value corresponding to the neighboring sample.

The invention discloses an industrial image denoising method and system based on cardinal number type polishing spline wavelets, and relates to the technical field of image processing. The method comprises the steps that a cubic cardinal number type polishing spline function serves as a scaling function, a cardinal number type polishing spline wavelet function with an explicit analytical expression is constructed, a dual-scale equation is established, and coefficients are derived. And carrying out frequency domain processing on the coefficient, and obtaining a reconstructed filter impulse response coefficient according to a complete reconstruction condition, namely, a dual wavelet dual-scale coefficient. A target industrial image is used as initial data, layer wavelet decomposition and nonlinear adaptive threshold processing are carried out through a reconstruction filter and a Mallat dual-channel filter bank to obtain approximation and detail information, then the image is reconstructed through Mallat inverse transformation, and denoising and detail protection are achieved.

This invention provides an optimization design method for a modulator system, comprising: designing an SDM system architecture, wherein the SDM system architecture includes a MIMO loop filter, a quantizer, and a MISO reconstruction filter; constructing a non-convex infinite constraint optimization model for the MIMO loop filter based on the time-domain discrete input signal and the feedback signal of the quantizer; solving the non-convex constraint optimization model for the MIMO loop filter to obtain an approximate global optimal solution; constructing a non-convex infinite constraint optimization model for the MISO reconstruction filter based on the quantized signal received by the MISO reconstruction filter and the filtering process of the received signal; and obtaining the approximate global optimal solution of the non-convex infinite constraint optimization model for the MISO reconstruction filter. The designed SDM system exhibits high signal-to-noise ratio performance.

The application discloses a kind of polar polar extreme measurement digital enhancement methods for high-power field source, belong to communication, detection and electromagnetic measurement field;First, for radar detection signal, wavelet function is selected to decompose signal layer by layer, and wavelet coefficient is obtained;Then, wavelet coefficient is eliminated and scaled, as far as possible to retain approximate coefficient and reduce detail coefficient, and layer by layer with the reconstruction filter coefficient of wavelet function is made convolution, and wavelet reconstruction obtains the signal y (n) after denoising;Again, singular value decomposition is carried out, and large signal L (n) is separated;The signal y (n) after denoising and the large signal L (n) separated are used as training set, and the weight and bias parameter of deep neural network are trained;Finally, the trained weight and bias parameter are loaded into deep neural network as post-compensator, and the nonlinear distortion signal after denoising is reasonably corrected by post-compensator.The application can eliminate the influence of receiving end nonlinearity and noise simultaneously, and greatly improve signal quality.