33results about How to "Reduce the impact of calculations" patented technology

The invention relates to a discontact location input system and method guided by hand and eye. It includes two CCD video cameras, a large scale display terminal, a computer installed plural image acquisition card. The system uses platform labeling module to label video camera parameter. The location input method includes following steps: full automation video camera demarcating, hand and eye location gathering, and demarcating target point solving. The invention is based on computer vision technology, and has the advantages of visual, accurate and real time.

The invention provides an acid tank type wet etching process, comprising: performing acid tank etching for the first time after the acid tank is changed; calculating the etching according to the number of silicon wafers accumulatively processed in the acid tank during the small acid change cycle The process time is obtained according to the calculated etching rate and the etching amount of the thin film of the silicon wafer, and the actual etching rate is obtained by the measured value and the process time. Starting from the second acid bath etching, according to the last calculated etching rate The etching rate and the actual etching rate adjust the etching rate of this process. In the acid tank type wet etching process of the present invention, the etching rate of each batch of silicon wafers in the etching process is calculated by the cumulative number of silicon wafers processed in the small acid change cycle, reducing the actual etching rate before and after the small acid change. The impact of sudden changes in etching rate on the calculation of process control can finally improve the accuracy of process control and realize continuous etching of silicon wafers.

The invention discloses a DC flow anti-interference algorithm for rotor grounding protection. In the invention, the DC voltage and leakage current of the rotor winding DC voltage and leakage current are pre-filtered and sampled, and N samples of DC voltage and sample leakage are first obtained before the switching of the electronic switch. Current, N accounts for 20% to 40% of the total sample S after low-pass filtering; then group the sample DC voltage and sample leakage current, calculate the average value of each group of samples, calculate the rate of change of the average value of the sample leakage current, and calculate the change rate According to the average value of the sample leakage current with the smallest rate of change and the average value of the DC voltage at the same time Value calculation of rotor grounding resistance and grounding position, effectively reducing the impact of fluctuations and interference on DC flow calculation; increasing the blocking judgment of severe fluctuations in DC voltage, effectively reducing the impact of severe fluctuations and interference on protection logic judgment.

The invention discloses a method and device for predicting a ground leakage fault of a train power supply system. The steps of the method include: S1. obtaining an output signal during the movement of the train power supply system in real time; S2. identifying whether there is a ground leakage fault according to the output signal obtained in real time, If a fault is identified, obtain the target parameter value of the power supply system under the current fault state, and obtain the fault data of the target parameter value, otherwise obtain the degradation data of the target parameter value; S3. Obtain the fault data of the target parameter value within the specified time period respectively , degradation data, obtain the degradation trajectory of the target parameter value, and evaluate the degradation trajectory of the target parameter value to predict the fault state of the power supply system; the device includes a signal acquisition module, a fault real-time monitoring module and a fault state prediction module. The invention has the advantages of simple implementation method, capable of realizing ground leakage fault monitoring and fault state prediction of the power supply system, and has the advantages of high prediction accuracy.

The invention discloses a vehicle-mounted 360-degree surround view display method and system. The method includes the following steps: S1: the projection module transforms the viewpoint of the image collected by each camera through a lookup table, and projects it to the top view of the vehicle; S2: uses the exposure gain algorithm to perform optical alignment of the four camera images; S3: uses stitching The algorithm stitches the stitching seams of the images collected by adjacent cameras to obtain the mosaic map of the vehicle's top view. The present invention reuses the stitching seam of the previous frame when there is little difference in the adjacent timing sequence of the stitching seam at a certain position, which greatly reduces the influence of noise on the seam calculation, thereby increasing stability, and directly using The stitching seam of the previous frame also reduces the time for stitching seam calculation and improves the algorithm efficiency.

The invention discloses an error processing method for calculating an HRV signal in a human body impedance signal. In the method, the RRI error identification unit first obtains the position information of the signal where the RRI may be incorrectly identified; The RRI information sets the quality level of the signal to calculate the interpolation information, and finally the interpolation unit performs interpolation according to the calculated interpolation information to obtain a new reliable RRI sequence. The present invention can be used as an effective method to reduce the impact of RRI error recognition with interference impedance signal on the calculation of HRV algorithm, so that the HRV calculation of impedance method can reach the standard of HRV calculation of electrocardiography method, and can improve the usability of human body impedance measurement signal and correct the error. The accurate identification of the RRI sequence can minimize the impact of the wrong RRI sequence on the subsequent HRV calculation.

The invention discloses a navigation satellite integrity key point comprehensive identification method based on a grey relational degree. The invention takes the navigation satellite system as a research object and brings forward three properties of the satellite integrity key point which include node reliability, integrity and topology importance degree, and comprehensively and effectively evaluates the importance of various nodes of the navigation satellite system. The navigation satellite integrity key point comprehensive identification method comprises steps of choosing an appropriate identification index, on the basis, calculating identification index values from the angles of the topology structure, reliability and integrity, performing irrelevant screening on the identification indexes, calculating the weight values of various identification indexes, obtaining a grey relevant value of each node through quantitative calculation and identifying integrity key point. The invention overcomes the influence on the system by node pairs, overcomes the insufficient evaluation which takes the node degree as a single index, effectively identifies the integrity key point and effectively guides the design of the navigation satellite system.

The invention discloses a method for dynamically adjusting the amount of coupons based on user behavior characteristics. The method includes: 1. Collecting and recording the user's operation variables on commodities in the t time period, and combining them to form the user behavior weight in the t time period ; 2. Calculate the user adjustment weight according to the user's coupon shopping information; 3. Perform cluster analysis on each user's personal information to obtain the feature weight of each user; 4. According to the formula and combine the behavior weight, adjust the weight and features Calculate the incentive score of each user by weight; 5: Divide the user's incentive score and preferential quota into M levels, and correspond the divided incentive scores and preferential quota one by one, and finally obtain the user's preferential quota level. The invention calculates the user's incentive level according to the user's behavior characteristics, and obtains different preferential amounts according to the level, so that different users can obtain different preferential amounts of the same type of coupons, forming personalized user incentives.

The invention relates to a method for measuring CT space resolution by improving the disk clamping method, and belongs to the technical field of image processing. The method includes: S1: installing and starting the CT detection device, S2: fan-beam ray scanning; S3: reconstructing the two-dimensional image of the disc card: reconstructing the two-dimensional image of the disc card by using the fan-beam FBP algorithm according to the obtained projection data; S4: Use the RTV algorithm to obtain the denoised grayscale image; S5: Use the improved disc card method to calculate the reconstructed two-dimensional image and the denoised gray image, and obtain the average gray level of the edge of the disc card value; S6: Calculate the ERF and PSF curves to obtain the MTF curve and CT spatial resolution of the disc card. The present invention reduces the influence of noise and insufficient manufacturing precision of the disc card on the calculation of the average gray value of the edge when calculating the gray value of the edge of the disc card, thereby having more accurate and reasonable results when calculating the spatial resolution of the CT system.

The invention discloses a quasi-static ultrasonic elastography displacement calculation method so as to solve the technical problems that linkage is mistaken and two-dimensional cross-correlation research calculated quantity is excessively large due to iteration in the prior art.The embodiment of the invention further provides a corresponding device.According to the feasible embodiment, the method comprises the steps of calculating a central point for any displacement, and utilizing prior time shifting for building an iteration cross-correlation function based on a neighborhood window for iteration cross-correlation calculation; obtaining a cross-correlation reliability exponential value of iteration cross-correlation calculation, and judging whether the cross-correlation reliability exponential value is smaller than a first credible threshold value or not; if the cross-correlation reliability exponential value is larger than or equal to the first credible threshold value, determining transverse time shifting according to the prior time shifting, and determining longitudinal time shifting according to the prior time shifting and an iteration cross-correlation result; if the cross-correlation reliability exponential value is smaller than the first credible threshold value, using two-dimensional comprehensive cross-correlation research inside the neighborhood to obtain the longitudinal time shifting and the transverse time shifting of the central point of displacement calculation; traversing all ultrasonic radio-frequency signals, and generating displacement field distribution of tested biological tissue.